The Experts below are selected from a list of 10356 Experts worldwide ranked by ideXlab platform

Noor Sabrina Ahmad Mutamim - One of the best experts on this subject based on the ideXlab platform.

  • bioelectrochemical cell becc integrated with granular activated carbon gac in treating spent caustic wastewater effects of Solid Retention Time srt and organic loading rate olr
    IOP Conference Series: Materials Science and Engineering, 2020
    Co-Authors: Norsafiah Fazli, Noor Sabrina Ahmad Mutamim, Syarifah Abd Rahim
    Abstract:

    The study aims to treat spent caustic wastewater by using a bioelectrochemical cell (BeCC) integrated with Granular Activated Carbon (GAC) as the bacterial attachment medium. BeCC is a bioelectrochemical reactor which employs microorganisms for substrates degradation and has the capacity to produce energy simultaneously. Microbial Fuel Cell (MFC) is also known as the bioreactor that could treat wastewater while producing energy. However, the BeCC reactor in the present study is more cost effective than an MFC reactor, since the BeCC was operated without the employment of a proton exchange membrane (PEM). The reactor was operated in a hybrid of anoxic and aerobic conditions whereby a baffle is used as the separator to minimize the oxygen transfer from the cathodic to the anodic side of the reactor. For enhancement of the BeCC performance, 10 g of suspended GAC was added into the BeCC reactor. The use of the suspended GAC is to allow higher surface area available for bacteria attachment. The study determined the best operating Solid Retention Time (SRT) and organic loading rate (OLR) of BeCC in treating spent caustic wastewater and its performance throughout 30 days of operation was evaluated based on its Chemical Oxygen Demand (COD) removal and open circuit voltage (OCV). For SRT study, BeCC was tested at various SRT of range within 10 to 30 days whereas for OLR study, BeCC was tested at various OLR of range within 700 to 900 mg COD /L.d. From the study, the highest COD removal were 94.17% and 92.7% achieved at SRT of 30 days and OLR of 700 mg COD/L.d respectively. Whereas for energy recovery, the highest OCV were 336.4 mV and 362 mV achieved at SRT of 20 days and OLR of 800 mg COD/L.d respectively. Biochemical bacteria identification test was also carried out to identify the bacteria morphology attached on GAC in the BeCC at SRT of 20 days with 700 mg COD/ L.d of OLR and it is found that Klebsiella Oxytoca was the dominant bacteria attached on the GAC.

  • Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time
    Chemical Engineering Research Bulletin, 2017
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor
    Abstract:

    This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended Solid (MLSS) concentration and Solid Retention Time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor. Chemical Engineering Research Bulletin 19(2017) 102-110

  • Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time
    'Bangladesh Journals Online (JOL)', 2017
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor
    Abstract:

    This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended Solid (MLSS) concentration and Solid Retention Time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor

  • membrane bioreactor applications and limitations in treating high strength industrial wastewater
    Chemical Engineering Journal, 2013
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor, Mohd Ariffin Abu Hassan, Adhi Yuniarto, Gustaf Olsson
    Abstract:

    This paper reviewed the application of membrane bioreactor in treating high strength industrial wastewater by analysing operational parameters, limitations and mitigations of MBR for industrial wastewater. High strength industrial wastewater is difficult to classify but by its characteristics can be predicted using biodegradability criteria (BOD5/COD). Several factors need to be taken into consideration to find suitable operating parameters such as hydraulic Retention Time (HRT), Solid Retention Time (SRT), mix liquor suspended Solid (MLSS), food to microorganism (F/M), transmembrane pressure (TMP) and Flux (J) to obtain good quality effluent and reduce the fouling effect. Fouling factors by membrane, biomass and MBR operation need to be taken seriously because they are the major problems affecting the performance of the MBR and quality of the effluent. There are specific methods to reduce and clean the clogging membrane depending on the level of severity of the fouling. The mitigation covers physical cleaning such as membrane relaxing, backwashing, a combination of both and chemical cleaning which is used for irreversible fouling. In some cases, modification of MBR is needed to improve the performance and to achieve high quality of effluent.

  • application of membrane bioreactor technology in treating high strength industrial wastewater a performance review
    Desalination, 2012
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor, Mohd Ariffin Abu Hassan, Gustaf Olsson
    Abstract:

    This paper reviews the performance of MBR in treating high strength industrial wastewater. The scope covers the operation, constraints and mitigation of the system in general views. High strength wastewater can be successfully treated by using membrane bioreactor (MBR) in different conditions according to the types and characteristics of wastewater and also MBR parameters operational control. High strength wastewater contains fats, oil and grease or other organic or inorganic compounds in great amount according to the types of sources that take part. Several factors need to be taken into consideration during the operation such as hydraulic Retention Time (HRT), Solid Retention Time (SRT), mix liquor suspended Solid (MLSS), food to microorganism (F/M), transmembrane pressure (TMP) and flux. Fouling factors need to be taken seriously because they are the major problems affecting the performance of the MBR and quality of the effluent. There are specific methods to reduce and clean the clogging membrane depending on the level of severity of the fouling. Besides that, the performance of MBR in removing soluble organic waste can be increased by adding a fouling reducer such as powdered activated carbon (PAC).

Peter A Vanrolleghem - One of the best experts on this subject based on the ideXlab platform.

  • modelling the production and degradation of soluble microbial products smp in membrane bioreactors mbr
    Water Research, 2008
    Co-Authors: Tao Jiang, Silvie Myngheer, Dirk J W De Pauw, Henri Spanjers, Ingmar Nopens, Maria D Kennedy, Gary L Amy, Peter A Vanrolleghem
    Abstract:

    MBR biochemical conditions have an effect on membrane fouling and SMP have been attributed to be the main MBR foulant. Thus, predicting the SMP concentration is essential for understanding and controlling MBR fouling. However, existing SMP models are mostly too complex and over-parameterized, resulting in inadequate or absent parameter estimation and validation. This study extends the existing activated sludge model No. 2d (ASM2d) to ASM2dSMP with introduction of only 4 additional SMP-related parameters. Dynamic batch experimental results were used for SMP parameter estimation leading to reasonable parameter confidence intervals. Finally, the ASM2dSMP model was used to predict the impact of operational parameters on SMP concentration. It would found that Solid Retention Time (SRT) is the key parameter controlling the SMP concentration. A lower SRT increased the utilization associated products (UAP) concentration, but decreased the biomass associated products (BAP) concentration and vice versa. A SRT resulting in minimum total SMP concentration can be predicted, and is found to be a relatively low value in the MBR. If MBRs operate under dynamic conditions and biological nutrient removal is required, a moderate SRT condition should be applied.

Yan Zhou - One of the best experts on this subject based on the ideXlab platform.

  • hydrogen production from a thermophilic alkaline waste activated sludge fermenter effects of Solid Retention Time srt
    Chemosphere, 2018
    Co-Authors: Yun Chen, Keke Xiao, Nan Shen, Raymond J Zeng, Yan Zhou
    Abstract:

    Abstract This study aims to investigate the effects of Solid Retention Times (SRTs) on hydrogen production via thermophilic alkaline fermentation of waste activated sludge. The reactor was subjected to a SRT from 10 to 6 days during approximately 82 days of operation. The results revealed that SRT had minor influence on hydrolysis and hydrolysis efficiency in different phases were from 48.11% to 50.55%. Nevertheless, the efficiency of acidogenesis process was highly related to SRT and longer SRT could enhance the acidogenesis. On the other hand, acidogenesis efficiency was also related to H2 partial pressure and high H2 partial pressure negatively affected the acidogenesis. Thus, the maximum acidification was achieved in phase 1 (21.29%) resulting in the maximum H2 yield in phase 1 (95.94 mL/g VSS; SRT = 10 days; H2 partial pressure = 0–18%). Phyla Actinobacteria and Proteobacteria, who are highly related to hydrolytic microbial population, were abundant in all phases that resulted in high hydrolysis extent. H2 production was attributed to the relative high abundance of Clostridia. Thus, this study suggested that longer SRT and lower H2 partial pressure was necessary to improve the H2 yield under alkaline pH condition.

  • long Solid Retention Time srt has minor role in promoting methane production in a 65 c single stage anaerobic sludge digester
    Bioresource Technology, 2018
    Co-Authors: Yun Chen, Keke Xiao, Nan Shen, Raymond J Zeng, Xie Jiang, Yan Zhou
    Abstract:

    In this study, a thermophilic (65°C) single-stage wasted activated sludge (WAS) digester was established and the effects of Solid Retention Time (SRT) on the reactor performance were investigated. The result showed that the optimum SRT was 6days with methane yield of 186.16mL/g VS. It was found that SRT had little effect on the hydrolysis and volatile Solids (VS) destruction, and the high temperature employed seemed sufficient to achieve maximum hydrolysis and VS destruction performance. Longer SRT, however, promoted the release of recalcitrant compounds and impaired acidification, leading to the low methane yield. The microbial community analysis revealed that the dominant pathway for methane production was through syntrophic activity of acetate oxidizing bacteria and hydrogenotrophic methanogens while acetoclastic methanogens were absent in the system.

Heng Liang - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Solid Retention Time on membrane fouling in membrane bioreactor: from the perspective of quorum sensing and quorum quenching.
    Applied microbiology and biotechnology, 2016
    Co-Authors: Heng Liang
    Abstract:

    Solid Retention Time (SRT) is one of the most important operational parameters in membrane bioreactor (MBR), which significantly influences membrane fouling. It is widely recognized that SRT mainly changes biomass characteristics, and then, influences membrane fouling. Effect of SRT on quorum sensing (QS) in MBR, which could also influence fouling by coordinating biofilm formation, has not been reported. In this study, fouling, QS, soluble microbial products (SMP), and extracellular polymer substances (EPS) in MBRs operated under SRTs of 4, 10, and 40 days were investigated. The results showed that as SRT increased, the abundance of quorum quenching (QQ) bacteria increased, the quorum signal degradation activity of activated sludge increased, the concentrations of signal molecules in MBR decreased, the excretion of SMP and EPS decreased, and thus membrane biofouling was alleviated. Therefore, besides altering the biomass physiochemical properties, SRT also changed the balance between QS and QQ in MBR, and in this way, influenced membrane biofouling.

  • relationship between soluble microbial products smp and effluent organic matter efom characterized by fluorescence excitation emission matrix coupled with parallel factor analysis
    Chemosphere, 2015
    Co-Authors: Lianpeng Sun, Haiqing Chang, Heng Liang, Zhengshuang Han, Senlin Shao
    Abstract:

    Abstract Effluent organic matter (EfOM) originating from wastewater treatment plant (WWTP) is of significant concern, as it not only influences the discharge quality of WWTP but also exerts a significant effect on the efficiency of the downstream advanced treatment facilities. Soluble microbial products (SMP) is a major part of EfOM. In order to further understand the relationship between soluble microbial products (SMP) and EfOM, and in turn, to propose measures for EfOM control, the formation of SMP and EfOM in identical activated sludge sequencing batch reactors (SBR) with different feed water was investigated using fluorescence excitation and emission spectroscopy matrix coupled with parallel factor analysis (EEM–PARAFAC) as well as other organic matter quantification tools. Results showed that EfOM contained not only SMP but also a considerable amount of allochthonous organic matter that derived not merely from natural organic matter (NOM). Four components in EfOM/SMP were identified by EEM–PARAFAC. Tyrosine-like substances in EfOM (Component 3, λ ex/em  = 270/316 nm) were mainly originated from utilization associated products (UAP) of SMP. Tryptophan-like substances (Component 2, λ ex/em  = 280/336 nm) as well as fulvic-like and humic-like substances in EfOM (Component 1, λ ex/em  = 240(290)/392 nm and Component 4, λ ex/em  = 260(365)/444 nm) were majorly derived from the refractory substances introduced along with the influent, among which Component 2 was stemmed from sources other than NOM. As Solid Retention Time (SRT) increased, Component 2 and polysaccharides in SMP/EfOM decreased, while Component 4 in SMP increased.

Zainura Zainon Noor - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time
    Chemical Engineering Research Bulletin, 2017
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor
    Abstract:

    This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended Solid (MLSS) concentration and Solid Retention Time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor. Chemical Engineering Research Bulletin 19(2017) 102-110

  • Assessment of Membrane Bioreactor in Treating Spent Sulfidic Caustic Wastewater: Effects of Organic Biomass Concentration and Solid Retention Time
    'Bangladesh Journals Online (JOL)', 2017
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor
    Abstract:

    This paper presents a study on the performance of an Aerobic Submerged u-shaped membrane bioreactor (ASMBR) in treating sulfidic spent caustic (SSC) in terms of mixed liquor suspended Solid (MLSS) concentration and Solid Retention Time (SRT). SSC wastewater is categorized as high strength wastewater and consists of high inorganic and organic matter. U-shape membrane bioreactors have a higher tendency to foul compared to other types of MBR. MLSS concentration and SRT are the major parameters when operating membrane bioreactor. In this study, COD removal recorded reduction of more than 95% for average MLSS concentration runs and 90% for SRTs runs. Meanwhile, sulfide was removed 99%, and formed up to 79% of sulfate. The biofouling for MLSS concentration and SRTs were observed through TMP rate change and TMP average performance, TMP trend and SMP and EPS trends. Biocake layer and biolayer deposited on membrane surface was found influenced by biomass, the inert particulate biomass products accumulating in the reactor

  • membrane bioreactor applications and limitations in treating high strength industrial wastewater
    Chemical Engineering Journal, 2013
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor, Mohd Ariffin Abu Hassan, Adhi Yuniarto, Gustaf Olsson
    Abstract:

    This paper reviewed the application of membrane bioreactor in treating high strength industrial wastewater by analysing operational parameters, limitations and mitigations of MBR for industrial wastewater. High strength industrial wastewater is difficult to classify but by its characteristics can be predicted using biodegradability criteria (BOD5/COD). Several factors need to be taken into consideration to find suitable operating parameters such as hydraulic Retention Time (HRT), Solid Retention Time (SRT), mix liquor suspended Solid (MLSS), food to microorganism (F/M), transmembrane pressure (TMP) and Flux (J) to obtain good quality effluent and reduce the fouling effect. Fouling factors by membrane, biomass and MBR operation need to be taken seriously because they are the major problems affecting the performance of the MBR and quality of the effluent. There are specific methods to reduce and clean the clogging membrane depending on the level of severity of the fouling. The mitigation covers physical cleaning such as membrane relaxing, backwashing, a combination of both and chemical cleaning which is used for irreversible fouling. In some cases, modification of MBR is needed to improve the performance and to achieve high quality of effluent.

  • application of membrane bioreactor technology in treating high strength industrial wastewater a performance review
    Desalination, 2012
    Co-Authors: Noor Sabrina Ahmad Mutamim, Zainura Zainon Noor, Mohd Ariffin Abu Hassan, Gustaf Olsson
    Abstract:

    This paper reviews the performance of MBR in treating high strength industrial wastewater. The scope covers the operation, constraints and mitigation of the system in general views. High strength wastewater can be successfully treated by using membrane bioreactor (MBR) in different conditions according to the types and characteristics of wastewater and also MBR parameters operational control. High strength wastewater contains fats, oil and grease or other organic or inorganic compounds in great amount according to the types of sources that take part. Several factors need to be taken into consideration during the operation such as hydraulic Retention Time (HRT), Solid Retention Time (SRT), mix liquor suspended Solid (MLSS), food to microorganism (F/M), transmembrane pressure (TMP) and flux. Fouling factors need to be taken seriously because they are the major problems affecting the performance of the MBR and quality of the effluent. There are specific methods to reduce and clean the clogging membrane depending on the level of severity of the fouling. Besides that, the performance of MBR in removing soluble organic waste can be increased by adding a fouling reducer such as powdered activated carbon (PAC).