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Necchi Junior Orlando - One of the best experts on this subject based on the ideXlab platform.
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Short-term successional dynamics of a macroalgal community in a stream from northwestern São Paulo State, Brazil
Sociedade Botânica do Brasil, 2008Co-Authors: Borges, Fábio Renato, Necchi Junior OrlandoAbstract:Este estudo visou: descrever um evento de sucessão ecológica em curto período (70 dias) da comunidade de macroalgas após distúrbio artificial (remoção); avaliar se as características da estrutura da comunidade foram semelhantes antes e depois do período experimental; comparar o processo sucessional em dois trechos experimentais (parcialmente e totalmente perturbados, TPP e TTP), simulando distúrbios de médio (parcial) e grande impacto (completa remoção). Com relação ao tempo de colonização, Oedogonium sp. foi classificada como sucessional indiferente, enquanto Chaetophora elegans (Roth) C. Agarth e Batrachospermum delicatulum (Skuja) Necchi et Entwisle como sucessionais tardias para TTP; para TPP a única diferença foi que Oedogonium sp. foi classificada como sucessional tardia. Temperatura foi a variável mais influente para a maioria das espécies e variáveis biológicas, com aumentos de temperatura provavelmente favorecendo taxas de reprodução. Quanto à estratégia de vida Oedogonium sp. foi classificada como estrategista C-S, enquanto B. delicatulum e C. elegans como estrategistas S para os dois trechos. de maneira geral, a recuperação da estrutura da comunidade não foi completa ao final do período de sucessão. Este estudo de curto período foi consistente com o processo de sucessão determinístico, pois a trajetória de sucessão foi previsível, porque riqueza e abundância de espécies, formas de crescimento e estratégias de vida seguiram um padrão definido.This investigation aimed to describe a short term (70 days) ecological succession event of a macroalgal community in a stream from northwestern São Paulo state (20º43'S; 49º13'W) after artificial disturbance (removal); evaluate if community structure characteristics were similar before and after the experimental period; compare the successional process of two experimental stream segments (partly and completely disturbed segments, PDS and CDS, respectively), simulating medium (partial) and high impact (complete removal) disturbances. In terms of colonization time, Oedogonium sp. was classified as successionally indifferent, whereas Chaetophora elegans (Roth) C. Agarth and Batrachospermum delicatulum (Skuja) Necchi et Entwisle were classified as late successional forms for CDS; for PDS the only difference was that Oedogonium sp. was classified as late successional. In terms of successional strategy, Oedogonium sp. was classified as a C-S strategist, whereas C. elegans and B. delicatulum were regarded as S strategists for both stream segments. Temperature was the most influential variable for most species and biological variables, with temperature increases probably favouring reproduction rates. In general, community structure recovery was not complete at the end of succession. This short-term study was consistent with the deterministic process of succession, since the succession trajectory was predictable, because species richness and abundance, growth forms and life strategies followed a definite pattern.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP
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Dinâmica temporal de duas espécies de Chaetophoraceae (Chlorophyta) em riachos tropicais do Estado de São Paulo, sudeste do Brasil
Sociedade Botânica de São Paulo, 2003Co-Authors: Branco, Ciro C.z., Necchi Junior OrlandoAbstract:Temporal dynamics of the Chaetophoracean green algae Chaetophora elegans (Roth) C.A. Agardh and Stigeoclonium amoenum Kützing populations was investigated biweekly during late autumn trhough early spring (April to October) in two tropical streams from northwestern São Paulo State, southeastern Brazil. Abundances of one population of each species was evaluated by the quadrat technique in terms of percent cover and frequency. The fluctuations were related to the following stream variables: temperature, turbidity, specific conductance, pH, oxygen saturation, depth, substratum type, current velocity, irradiance and nutrients. Percent cover and frequency of C. elegans had lower values throughout the study period and was positively correlated to rainfall. Other correlations (i.e. positive of percent cover with depth and current velocity and negative with irradiance) were consistently found, reinforcing the strong influence of rainfall. On the other hand, percent cover and frequency of S. amoenum had higher values, with maximum growth from June to September. Percent cover was negatively correlated to rainfall. Results suggest the precipitation regime as the most important driving force to temporal changes in both populations, but playing different roles in each one. The gelatinous thallus of C. elegans seem to be favored by the increment of current velocity, since higher flows can improve the nutrient uptake by means of reduction in diffusion shell without promoting excessive drag force. In contrast, tufts of S. amoenum are, presumably, more exposed to drag force, and, consequently, more susceptible to mechanical damage effects due to higher current velocities.A dinâmica temporal das algas verdes Chaetophora elegans (Roth) C.A. Agardh e Stigeoclonium amoenum Kützing foi investigada bimensalmente de final do outono a início da primavera (abril a outubro) em dois riachos da região noroeste do estado de São Paulo. A abundância (cobertura percentual e freqüência) de uma população de cada espécie foi avaliada pela técnica de quadrado. A flutuação foi relacionada com as seguintes variáveis ambientais: temperatura, turbidez, condutividade específica, pH, oxigênio dissolvido, profundidade, tipo de substrato, velocidade da correnteza, irradiância e nutrientes. Cobertura percentual e freqüência de C. elegans foram baixas durante todo o período e correlacionaram-se positivamente com precipitação pluviométrica. Outras correlações (positiva de cobertura percentual com profundidade e velocidade da correnteza e negativa com irradiância) foram consistentemente encontradas, reforçando a forte influência da precipitação. Cobertura percentual e freqüência de S. amoenum foram altas, com valores máximos entre junho e setembro. Cobertura percentual foi negativamente correlacionada com precipitação. Os resultados sugerem o regime de precipitação pluviométrica como a mais importante força influenciadora das mudanças temporais em ambas populações, entretanto, desempenhando diferentes papéis em cada uma delas. O talo gelatinoso de C. elegans parece ser favorecido por um aumento da velocidade da correnteza, pois fluxos mais intensos levariam a uma maior eficiência na aquisição de nutrientes, devido à redução no tamanho da concha de difusão sem, entretanto, provocar atrito excessivo entre a planta e a massa d'água. Em contraste, tufos de S. amoenum são, presumivelmente, mais expostos e, conseqüentemente, mais susceptíveis à força mecânica gerada pelo aumento da velocidade da correnteza
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Temporal dynamics of two species of Chaetophoraceae (Chlorophyta) in tropical streams of São Paulo State, Southeastern Brazil
Sociedade Botânica de São Paulo, 2003Co-Authors: Branco, Ciro C.z., Necchi Junior OrlandoAbstract:A dinâmica temporal das algas verdes Chaetophora elegans (Roth) C.A. Agardh e Stigeoclonium amoenum Kützing foi investigada bimensalmente de final do outono a início da primavera (abril a outubro) em dois riachos da região noroeste do estado de São Paulo. A abundância (cobertura percentual e freqüência) de uma população de cada espécie foi avaliada pela técnica de quadrado. A flutuação foi relacionada com as seguintes variáveis ambientais: temperatura, turbidez, condutividade específica, pH, oxigênio dissolvido, profundidade, tipo de substrato, velocidade da correnteza, irradiância e nutrientes. Cobertura percentual e freqüência de C. elegans foram baixas durante todo o período e correlacionaram-se positivamente com precipitação pluviométrica. Outras correlações (positiva de cobertura percentual com profundidade e velocidade da correnteza e negativa com irradiância) foram consistentemente encontradas, reforçando a forte influência da precipitação. Cobertura percentual e freqüência de S. amoenum foram altas, com valores máximos entre junho e setembro. Cobertura percentual foi negativamente correlacionada com precipitação. Os resultados sugerem o regime de precipitação pluviométrica como a mais importante força influenciadora das mudanças temporais em ambas populações, entretanto, desempenhando diferentes papéis em cada uma delas. O talo gelatinoso de C. elegans parece ser favorecido por um aumento da velocidade da correnteza, pois fluxos mais intensos levariam a uma maior eficiência na aquisição de nutrientes, devido à redução no tamanho da concha de difusão sem, entretanto, provocar atrito excessivo entre a planta e a massa d'água. em contraste, tufos de S. amoenum são, presumivelmente, mais expostos e, conseqüentemente, mais susceptíveis à força mecânica gerada pelo aumento da velocidade da correnteza.Temporal dynamics of the Chaetophoracean green algae Chaetophora elegans (Roth) C.A. Agardh and Stigeoclonium amoenum Kützing populations was investigated biweekly during late autumn trhough early spring (April to October) in two tropical streams from northwestern São Paulo State, southeastern Brazil. Abundances of one population of each species was evaluated by the quadrat technique in terms of percent cover and frequency. The fluctuations were related to the following stream variables: temperature, turbidity, specific conductance, pH, oxygen saturation, depth, substratum type, current velocity, irradiance and nutrients. Percent cover and frequency of C. elegans had lower values throughout the study period and was positively correlated to rainfall. Other correlations (i.e. positive of percent cover with depth and current velocity and negative with irradiance) were consistently found, reinforcing the strong influence of rainfall. on the other hand, percent cover and frequency of S. amoenum had higher values, with maximum growth from June to September. Percent cover was negatively correlated to rainfall. Results suggest the precipitation regime as the most important driving force to temporal changes in both populations, but playing different roles in each one. The gelatinous thallus of C. elegans seem to be favored by the increment of current velocity, since higher flows can improve the nutrient uptake by means of reduction in diffusion shell without promoting excessive drag force. In contrast, tufts of S. amoenum are, presumably, more exposed to drag force, and, consequently, more susceptible to mechanical damage effects due to higher current velocities.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq
Eduardo J. Cáceres - One of the best experts on this subject based on the ideXlab platform.
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precisiones sobre la morfologia y ultraestructura del talo de Chaetophora elegans Chaetophorales chlorophyta
Darwiniana, 2003Co-Authors: Karina M Michetti, Patricia I Leonardi, Eduardo J. CáceresAbstract:Se describe el talo de Chaetophora elegans precisando la morfologia de los sistemas postrado y erguido, se realiza el primer estudio detallado de la ultraestructura vegetativa en el genero y se amplia la distribucion de la especie en la Republica Argentina.
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Precisiones sobre la morfología y ultraestructura del talo de Chaetophora elegans (Chaetophorales, chlorophyta)
Instituto de Botánica Darwinion y el Museo Botánico de Córdoba, 2003Co-Authors: Karina M Michetti, Patricia I Leonardi, Eduardo J. CáceresAbstract:Se describe el talo de Chaetophora elegans precisando la morfología de los sistemas postrado y erguido, se realiza el primer estudio detallado de la ultraestructura vegetativa en el género y se amplía la distribución de la especie en la República Argentin
Orlando Necchi - One of the best experts on this subject based on the ideXlab platform.
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taxonomy and ecological distribution of Chaetophoraceae Chaetophorales chlorophyta in lotic ecosystems from sao paulo state southeastern brazil
Algological Studies Archiv für Hydrobiologie Supplement Volumes, 2002Co-Authors: Ciro Cesar Zanini Branco, Orlando Necchi, Luis Henrique Zanini BrancoAbstract:172 stream segments were sampled for the presence of Chaetophoraceae representatives among macroalgal communities from May to October in 1992-1993 and 1996-1997 in five natural regions (parts of biomes or selected geological areas) and one disturbed area of Sao Paulo State, southeastern Brazil (19°45'-21°25'S, 49°45'-51°30'W). This study is based on the examination of 97 samples, from which ten species of Chaetophoraceae were identified: Chaetophora attenuata, C. elegans, C. pisiformis, Draparnaldia mutabilis, Stigeoclonium amoenum, S. farctum, S. fasciculare, S. helveticum, S. lubricum and S. subsecundum. Chaetophora attenuata and S. subsecundum were reported for the first time for Brazil. For each species the following information was provided: description, diagnostic feature, illustration, list of populations examined, known distribution in Brazil and associated macroalgal species. Species of Chaetophora and Stigeoclonium were evaluated according to a new set of taxonomic criteria combining characters from prostrate and erect systems. The number of species found in streams from Silo Paulo State was relatively high when compared to other world regions; however, species abundance (% cover) showed lower values. No correlations between number and abundance of the family and environmental variables were found but the following combination of environmental parameters was the most closely related to the occurrence of Chaetophoraceae: higher temperatures and current velocity, intermediate specific conductance, oxygen saturation and turbidity and pH circumneutral. All species reported for Sao Paulo State can be considered as having wide geographical distribution, occurring in tropical and temperate regions of both hemispheres. members of Chaetophoraceae were found in all biomes/ regions. The most widespread species was C. elegans, occurring in four of the six regions investigated; on the other hand, 30 % of the total species were recorded in a single biome/ region. A reappraisal of specific identification in Chaetophoraceae is clearly needed. It should include a larger number of populations and habitats, and should embrace classical, morphological characters, as well as ultrastructural and molecular data.
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Temporal dynamics of two species of Chaetophoraceae (Chlorophyta) in tropical streams of São Paulo State, southeastern Brazil
2002Co-Authors: Ciro C. Z. Branco, Orlando NecchiAbstract:ABSTRACT – (Temporal dynamics of two species of Chaetophoraceae (Chlorophyta) in tropical streams of São Paulo State, southeastern Brazil). Temporal dynamics of the Chaetophoracean green algae Chaetophora elegans (Roth) C.A. Agardh and Stigeoclonium amoenum Kützing populations was investigated biweekly during late autumn trhough early spring (April to October) in two tropical streams from northwestern São Paulo State, southeastern Brazil. Abundances of one population of each species was evaluated by the quadrat technique in terms of percent cover and frequency. The fluctuations were related to the following stream variables: temperature, turbidity, specific conductance, pH, oxygen saturation, depth, substratum type, current velocity, irradiance and nutrients. Percent cover and frequency of C. elegans had lower values throughout the study period and was positively correlated to rainfall. Other correlations (i.e. positive of percent cover with depth and current velocity and negative with irradiance) were consistently found, reinforcing the strong influence of rainfall. On the other hand, percent cover and frequency of S. amoenum had higher values, with maximum growth from June to September. Percent cover was negatively correlated to rainfall. Results suggest the precipitation regime as the most important driving force to temporal changes in both populations, but playing different roles in each one. The gelatinous thallus of C. elegans seem to be favored by the increment of current velocity, since higher flows can improve the nutrient uptake by means of reduction in diffusion shell without promoting excessive drag force. In contrast, tufts of S. amoenum are, presumably, more exposed to drag force, and, consequently, more susceptible to mechanical damage effects due to higher current velocities
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microhabitat and morphometric variation of two Chaetophoracean Chaetophorales chlorophyta species in tropical streams of southeastern brazil
Phycological Research, 1998Co-Authors: Ciro Cesar Zanini Branco, Orlando NecchiAbstract:SUMMARY Two populations of Chaetophora elegans (Roth) C, Agardh and two of Stigeoclonium helveticum Vischer were investigated for microhabitat characteristics and morphological variation in streams of Sao Paulo State, southeastern Brazil. Different patterns of microhabitat distribution were found between species investigated. Populations of C, elegans were distributed under relatively narrow microhabitat conditions (high irradiance, low depth, moderate to high current velocity, rocky substrata and lower values of niche width) and showing little morphometric variation (colony diameter, main axis cell size, and apical branch number), Stigeoclonium helveticum occurred under more diverse microhabitat conditions, revealed by lack of significant difference between sampling units with and without the alga and wider niche width, but also exhibited relatively narrow morphometric variation (plant length, main axis cell and lateral branch cell sizes). The narrow microhabitat conditions and smaller niche width of C. elegans can explain its low abundance (percentage cover) in streams from the area studied as well as in other regions of Sao Paulo State, In contrast, the wider variation of microhabitat conditions and the higher niche widths of S. helveticum suggest that this green alga is able to grow in a high number of stream ecosystems in the region investigated, ranging from undisturbed to highly disturbed habitats. Thus, the results suggest that S. helveticum is a generalist species.
Isik Mustafa - One of the best experts on this subject based on the ideXlab platform.
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Effect of Sludge Retention Time on Biomass Production and Nutrient Removal at an Algal Membrane Photobioreactor
'Springer Science and Business Media LLC', 2019Co-Authors: Solmaz Alper, Isik MustafaAbstract:WOS: 000464768000017In this study, the effect of sludge retention time (SRT) on biomass production and nutrient removal was determined by constant hydraulic retention time (HRT) with mixed microalgae culture. The SRTs of 2, 3, 6, 12, and 24 days with constant 24h HRT were studied in microalgae membrane photobioreactor (msMpBR) by using hollow fiber (HF) membranes with a pore diameter of 0.45m. According to the results, the best removal was achieved within 3days of SRT. Chlorophyll-a/mixed liquor suspended solid (MLSS) ratios were found to be 0.033. Total nitrogen (TN) and phosphate phosphorus (PO4-P) removal rates were found to be 5.55mgN/Lday(-1), and 0.4mg PO4-P/Lday(-1), respectively. The volumetric microalgae production was found to be 0.118g/Lday(-1). Also, Chaetophora sp. and Navicula sp. cultures were found to be dominant in steady state. The percentage of lipid and protein in dry biomass was obtained to be 8.94% and 30.34%, respectively. It is advisable to use algal membrane photobioreactor, and mixed microalgae cultures instead of specific microalgae cultures, which could be readily affected by seasonal changes and outdoor conditions in wastewater treatment.Aksaray University (BAP Project) [2015-043]I would like to express my special thanks of gratitude to Aksaray University (BAP Project No: 2015-043), Kayseri Organized Industrial Zone Management, and Dr. Murat KAYA of Aksaray University, Biotechnology and Molecular Biology Department because of their contributions and supports in defining the species in mixed cultures
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Polishing the secondary effluent and biomass production by microalgae submerged membrane photo bioreactor
'Elsevier BV', 2019Co-Authors: Solmaz Alper, Isik MustafaAbstract:Microalgae are used in wastewater treatment successfully by the uptake of nutrients in secondary effluents that can be used as a valuable biomass. In this study, mixed microalgae culture was used for real wastewater treatment plant (WWTP) for polishing the effluent instead of the specific culture, because the specific culture is contaminated under real environmental conditions. Nutrient removal rates, protein and lipid content of the biomass were determined. Volumetric microalgae productivity was found as 0.037 g/L.day with 3 days of sludge retention times (SRT) and 24 h of hydraulic retention time (HRT) in a 5.5 L microalgae submerged membrane photo bioreactor (msMpBR). Total nitrogen (TN) and phosphate phosphorus (PO4-P) removal rates were found to be 5.55 and 0.40 mg/L.day, respectively, while Navicula sp. and Chaetophora sp. cultures were found to be dominant in steady state. The lipid content was 14.33% and raw protein content was 32.69% in dry biomass. The results showed that N and P can be effectively removed from the real wastewaters by mixed microalgae culture and msMpBR and also algal biomass could be produced with good lipid and protein content...
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Polishing the secondary effluent and biomass production by microalgae submerged membrane photo bioreactor
'Elsevier BV', 2019Co-Authors: Solmaz Alper, Isik MustafaAbstract:WOS: 000471790300001Microalgae are used in wastewater treatment successfully by the uptake of nutrients in secondary effluents that can be used as a valuable biomass. In this study, mixed microalgae culture was used for real wastewater treatment plant (WWTP) for polishing the effluent instead of the specific culture, because the specific culture is contaminated under real environmental conditions. Nutrient removal rates, protein and lipid content of the biomass were determined. Volumetric microalgae productivity was found as 0.037 g/L. day with 3 days of sludge retention times (SRT) and 24 h of hydraulic retention time (HRT) in a 5.5 L microalgae submerged membrane photo bioreactor (msMpBR). Total nitrogen (TN) and phosphate phosphorus (PO4-P) removal rates were found to be 5.55 and 0.40 mg/L. day, respectively, while Navicula sp. and Chaetophora sp. cultures were found to be dominant in steady state. The lipid content was 14.33% and raw protein content was 32.69% in dry biomass. The results showed that N and P can be effectively removed from the real wastewaters by mixed microalgae culture and msMpBR and also algal biomass could be produced with good lipid and protein content.Aksaray University [2015-043]; Biotechnology and Molecular Biology Department because of their contributionsThis work was supported by the Aksaray University (grant number 2015-043). We would like to express my special thanks of gratitude to Kayseri Organized Industrial Zone Management and Dr. Murat KAYA of Aksaray University, Biotechnology and Molecular Biology Department because of their contributions and supports in defining the species in mixed cultures
Solmaz Alper - One of the best experts on this subject based on the ideXlab platform.
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Effect of Sludge Retention Time on Biomass Production and Nutrient Removal at an Algal Membrane Photobioreactor
'Springer Science and Business Media LLC', 2019Co-Authors: Solmaz Alper, Isik MustafaAbstract:WOS: 000464768000017In this study, the effect of sludge retention time (SRT) on biomass production and nutrient removal was determined by constant hydraulic retention time (HRT) with mixed microalgae culture. The SRTs of 2, 3, 6, 12, and 24 days with constant 24h HRT were studied in microalgae membrane photobioreactor (msMpBR) by using hollow fiber (HF) membranes with a pore diameter of 0.45m. According to the results, the best removal was achieved within 3days of SRT. Chlorophyll-a/mixed liquor suspended solid (MLSS) ratios were found to be 0.033. Total nitrogen (TN) and phosphate phosphorus (PO4-P) removal rates were found to be 5.55mgN/Lday(-1), and 0.4mg PO4-P/Lday(-1), respectively. The volumetric microalgae production was found to be 0.118g/Lday(-1). Also, Chaetophora sp. and Navicula sp. cultures were found to be dominant in steady state. The percentage of lipid and protein in dry biomass was obtained to be 8.94% and 30.34%, respectively. It is advisable to use algal membrane photobioreactor, and mixed microalgae cultures instead of specific microalgae cultures, which could be readily affected by seasonal changes and outdoor conditions in wastewater treatment.Aksaray University (BAP Project) [2015-043]I would like to express my special thanks of gratitude to Aksaray University (BAP Project No: 2015-043), Kayseri Organized Industrial Zone Management, and Dr. Murat KAYA of Aksaray University, Biotechnology and Molecular Biology Department because of their contributions and supports in defining the species in mixed cultures
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Polishing the secondary effluent and biomass production by microalgae submerged membrane photo bioreactor
'Elsevier BV', 2019Co-Authors: Solmaz Alper, Isik MustafaAbstract:Microalgae are used in wastewater treatment successfully by the uptake of nutrients in secondary effluents that can be used as a valuable biomass. In this study, mixed microalgae culture was used for real wastewater treatment plant (WWTP) for polishing the effluent instead of the specific culture, because the specific culture is contaminated under real environmental conditions. Nutrient removal rates, protein and lipid content of the biomass were determined. Volumetric microalgae productivity was found as 0.037 g/L.day with 3 days of sludge retention times (SRT) and 24 h of hydraulic retention time (HRT) in a 5.5 L microalgae submerged membrane photo bioreactor (msMpBR). Total nitrogen (TN) and phosphate phosphorus (PO4-P) removal rates were found to be 5.55 and 0.40 mg/L.day, respectively, while Navicula sp. and Chaetophora sp. cultures were found to be dominant in steady state. The lipid content was 14.33% and raw protein content was 32.69% in dry biomass. The results showed that N and P can be effectively removed from the real wastewaters by mixed microalgae culture and msMpBR and also algal biomass could be produced with good lipid and protein content...
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Polishing the secondary effluent and biomass production by microalgae submerged membrane photo bioreactor
'Elsevier BV', 2019Co-Authors: Solmaz Alper, Isik MustafaAbstract:WOS: 000471790300001Microalgae are used in wastewater treatment successfully by the uptake of nutrients in secondary effluents that can be used as a valuable biomass. In this study, mixed microalgae culture was used for real wastewater treatment plant (WWTP) for polishing the effluent instead of the specific culture, because the specific culture is contaminated under real environmental conditions. Nutrient removal rates, protein and lipid content of the biomass were determined. Volumetric microalgae productivity was found as 0.037 g/L. day with 3 days of sludge retention times (SRT) and 24 h of hydraulic retention time (HRT) in a 5.5 L microalgae submerged membrane photo bioreactor (msMpBR). Total nitrogen (TN) and phosphate phosphorus (PO4-P) removal rates were found to be 5.55 and 0.40 mg/L. day, respectively, while Navicula sp. and Chaetophora sp. cultures were found to be dominant in steady state. The lipid content was 14.33% and raw protein content was 32.69% in dry biomass. The results showed that N and P can be effectively removed from the real wastewaters by mixed microalgae culture and msMpBR and also algal biomass could be produced with good lipid and protein content.Aksaray University [2015-043]; Biotechnology and Molecular Biology Department because of their contributionsThis work was supported by the Aksaray University (grant number 2015-043). We would like to express my special thanks of gratitude to Kayseri Organized Industrial Zone Management and Dr. Murat KAYA of Aksaray University, Biotechnology and Molecular Biology Department because of their contributions and supports in defining the species in mixed cultures
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Biomass production and nutrient removal by using micoalgal submerged membrane photobioreactor
Aksaray Üniversitesi Fen Bilimleri Enstitüsü, 2018Co-Authors: Solmaz AlperAbstract:Bu çalışmada mikroalgal batık fotobiyoreaktörde (mbMfBR) karışık mikroalg kültürü ve 0,45 µm hollow fiber (HF) membran ile atıksudan nütriyent giderimi ve biyokütle üretimi incelenmiştir. Sentetik atıksuda 24 saat hidrolik bekletme süresi (HBS) sabit tutularak 3, 6, 12 ve 24 günlük çamur yaşlarında (ÇY) çalışılıp optimum ÇY belirlenmiş ve ayrıca bu ÇY'de 48, 60 ve 72 saatlik HBS'ler çalışılarak optimum HBS belirlenmiştir. Belirlenen optimum şartlarda gerçek atıksu ile çalışılmalar yapılmıştır. Tüm çalışmalarda hacimsel mikroalg üretim verimleri ve nütriyent giderim hızları belirlenmiştir. Ayrıca üretilen biyokütlenin yağ ve protein içeriği saptanmış ve her bir çalışmanın belirli zamanlarındaki baskın kültürlerin tayinleri yapılmıştır. Buna göre sentetik atıksuda optimum değerler ÇY 3 gün ve HBS ise 24 saat olarak tespit edilmiştir. Bu çalışmada kararlı şartlarda askıda katı madde (AKM) ve klorofil-a derişimleri sırasıyla 354 mg/L ve 11,54 mg/L olarak ölçülmüştür ve hacimsel mikroalg üretim hızı ise 0,118 gr/L-gün olarak hesaplanmıştır. Giderim hızları ise toplam azotta (TN) 5,55 mg/L-gün, fosfat fosforunda (PO4-P) 0,40 mg/L-gün olarak bulunmuştur. Ayrıca kararlı şartlarda %45-50 civarında Chaetophora sp., %45-50 civarında Navicula sp. gözlemlenmiş ve kuru biyokütledeki yağ oranı %8,90, protein oranı ise %30 olarak ölçülmüştür. Gerçek bir arıtılmış evsel atıksuda ise nütriyent giderim hızları TN ve PO4-P'de sırasıyla 1,37 mg/L-gün ve 0,40 mg/L-gün olarak bulunmuştur. Hacimsel mikroalg üretim hızı ise 0,037 gr/L-gün olarak bulunmuş ve biyokütlede %14,33 oranında yağ ve %32,2 oranında protein ölçülmüştür. Bu sonuçlara göre, bu çalışmada membranlar sayesinde reaktördeki biyokütlenin kaçışı engellenerek yüksek derişimlere ulaşılabilmiştir. Ayrıca karışık mikroalg kültürü ile elde edilen biyokütle verimlerinin ve nütriyent giderim hızlarının tek tip kültüre nazaran kabul edilebilir nitelikte olduğu ortaya konulmuştur. Diğer taraftan elde edilen kuru biyokütlede yapılan protein ve yağ analizi ile ham besin ya da alternatif biyoyakıt ürünleri için (biyodizel, etanol, biyoelektrik, hidrojen, metan vs.) karışık mikroalg kültürünün potansiyeli gelecekteki araştırmacılar için bilgi kaynağı olacaktır.In this study, nutrient removal and biomass productivity from wastewater with mixed microalgae culture and 0.45 µm hollow fiber (HF) membrane were investigated at microalgae submerged membrane photobioreactor (msMpBR). 24 hours of hydraulic retention time (HRT) was kept constant and 3, 6, 12 and 24 days of sludge retention time (SRT) were studied and optimum SRT was determined by synthetic wastewater and also 48, 60 and 72 hours of HRT were studied in this SRT to determine the optimum HRT. The real wastewater has been studied with the optimum conditions. Volumetric microalgae production efficiency and nutrient removal rates were determined in all studies. In addition, the lipid and protein content of the produced biomass was determined and the predominant cultures at set times of each study were determined. According to this, the optimum values in synthetic wastewater were determined as 3 days of SRT and 24 hours of HRT. In this study, mixed liquid suspended solids (MLSS) and Chlorophyll-a concentrations in stable conditions were measured as 354 mg/L and 11.54 mg/L, respectively, and the volumetric microalgae production rate was calculated as 0.118 gr/L-day. Removal rates were found to be 5.55 mg/L-day in total nitrogen (TN) and 0.40 mg/L-day in phosphate phosphorus (PO4-P). In addition, in stable conditions approximately 45-50% Chaetophora sp. and 45-50% Navicula sp. were observed and lipid ratio was 8.90% and protein ratio was 30% in dry biomass. In real treated domestic wastewater, nutrient removal rates were found to be 1.37 mg/L-day and 0.40 mg/L-day in TN and PO4-P, respectively. The volumetric microalgae production rate was found to as 0.037 gr/L-day and %14.33 lipid and 32.20% protein were measured in dry biomass. According to all these results, in this study, high concentrations were achieved by preventing the escape of biomass in the reactor. In addition, obtained biomass yields and nutrient removal rates by mixed microalgae culture were found to be acceptable compared to one type culture. On the other hand, the potential of mixed microalgae culture for dry biomass protein and oil analysis and raw food or alternative biofuel products (biodiesel, ethanol, bioelectric, hydrogen, methane etc.) will be a source of information for future researchers