The Experts below are selected from a list of 16647 Experts worldwide ranked by ideXlab platform
Yoav Bashan - One of the best experts on this subject based on the ideXlab platform.
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recycling waste debris of immobilized microalgae and plant growth promoting bacteria from wastewater treatment as a resource to improve fertility of eroded Desert Soil
Environmental and Experimental Botany, 2012Co-Authors: Adan Trejo, Luz E Debashan, Anton Hartmann, Juanpablo Hernandez, Michael Rothballer, M Schmid, Yoav BashanAbstract:Abstract This study attempted to demonstrate that biological residue from a new biological wastewater treatment is a resource for improving quality of arid Soils and plant growth. After tertiary wastewater treatment, debris composed of alginate beads containing the microalgae Chlorella sorokiniana and the plant growth-promoting bacterium Azospirillum brasilense was used as an amendment for eroded, infertile Desert Soil having low levels of organic matter. A. brasilense survived in these used dried beads for at least one year. Three consecutive applications of the dry debris increased organic matter, organic carbon, and microbial carbon in the Soil. Growth of sorghum in the amended Soil was greater than plants grown in low organic matter, untreated Soil or Soil amended with beads containing other combinations of alginate, microalgae, or bacteria. The surface of plant roots growing in the amended Soil was heavily colonized by A. brasilense, with no endophytic colonization; root tips were the preferred sites of colonization.
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recycling waste debris of immobilized microalgae and plant growth promoting bacteria from wastewater treatment as a resource to improve fertility of eroded Desert Soil
Environmental and Experimental Botany, 2012Co-Authors: Adan Trejo, Luz E Debashan, Anton Hartmann, Juanpablo Hernandez, Michael Rothballer, M Schmid, Yoav BashanAbstract:a b s t r a c t This study attempted to demonstrate that biological residue from a new biological wastewater treatment is a resource for improving quality of arid Soils and plant growth. After tertiary wastewater treatment, debris composed of alginate beads containing the microalgae Chlorella sorokiniana and the plant growth- promoting bacterium Azospirillum brasilense was used as an amendment for eroded, infertile Desert Soil having low levels of organic matter. A. brasilense survived in these used dried beads for at least one year. Three consecutive applications of the dry debris increased organic matter, organic carbon, and microbial carbon in the Soil. Growth of sorghum in the amended Soil was greater than plants grown in low organic matter, untreated Soil or Soil amended with beads containing other combinations of alginate, microalgae, or bacteria. The surface of plant roots growing in the amended Soil was heavily colonized by A. brasilense, with no endophytic colonization; root tips were the preferred sites of colonization. © 2011 Published by Elsevier B.V.
Raeid M. M. Abed - One of the best experts on this subject based on the ideXlab platform.
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Variable Response of Oil-polluted Soils to Biostimulation Treatments Using Nonionic Surfactants and Inorganic Nutrients
Environmental Processes, 2017Co-Authors: Raeid M. M. Abed, Sumaiya Al-kindiAbstract:We compared the response of oil-polluted Desert and marine Soils to biostimulation using three nonioinc surfactants (i.e., Triton X-100, Tween-80 and Brij-35) and inorganic nutrients (i.e., N and P) at different ratios. The addition of Tween-80 and Brij-35 resulted in an increase in the produced CO_2 from 2.1 ± 0.01 to 2.5 ± 0.10 and from 0.7 ± 0.01 to ≥1.3 ± 0.02 mg CO_2 g^−1 Soil after 49 days of incubation in the Desert and in the marine Soil, respectively. This corresponded to 51% increase in the oil mineralization rate in the marine Soil, but only to 20% increase in the Desert Soil. The addition of inorganic nutrients did not affect CO_2 production in the Desert Soil but increased the amount of CO_2 produced by the marine Soil to reach a maximum of 1.2 ± 0.07 mg CO_2 g^−1 Soil. The produced CO_2 in the marine Soil was comparable at the different N:P ratios. The observed variable response of the two Soils to biostimulation could be attributed to differences in their physico-chemical and biological characteristics. The Desert Soil had higher oil content and lesser nitrate concentrations than the marine Soil, and both Soils had different textures. The bacterial communities were very different, with no common genera between the two Soils. Betaproteobacteria was detected only in the Desert Soil whereas Deltaproteobacteria and Firmicutes were detected only in the marine Soil. We conclude that biostimulation depends on the physico-chemical and biological characteristics of polluted sites, therefore, bioremediation has to be tailored specifically for each type of Soil.
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effect of biostimulation using sewage sludge soybean meal and wheat straw on oil degradation and bacterial community composition in a contaminated Desert Soil
Frontiers in Microbiology, 2016Co-Authors: Sumaiya Alkindi, Raeid M. M. AbedAbstract:Waste materials have a strong potential in the bioremediation of oil-contaminated sites, because of their richness in nutrients and their economical feasibility. We used sewage sludge, soybean meal and wheat straw to biostimulate oil degradation in a heavily contaminated Desert Soil. While oil degradation was assessed by following the produced CO2 and by using gas chromatography-mass spectrometry (GC-MS), shifts in bacterial community composition were monitored using illumina MiSeq. The addition of sewage sludge and wheat straw to the Desert Soil stimulated the respiration activities more than the addition of soybean meal. GC-MS analysis revealed that the addition of addition of sewage sludge and wheat straw resulted in 1.7 to 1.8 fold increase in the degraded C14 to C30 alkanes, compared to only 1.3 fold increase in the case of soybean meal addition. The degradation of ≥ 90% of the C14 to C30 alkanes were measured in the Soils treated with sewage sludge and wheat straw. MiSeq sequencing revealed that the majority (76.5-86.4% of total sequences) of acquired sequences from the original Soil belonged to Alphaproteobacteria, Gammaproteobacteria and Firmicutes. Multivariate analysis of operational taxonomic units (OTUs) placed the bacterial communities of the Soils after the treatments in separate clusters (ANOSIM R=0.66, P=0.0001). The most remarkable shift in bacterial communities was in the wheat straw treatment, where 95-98% of the total sequences belonging to Bacilli. We conclude that sewage sludge and wheat straw are useful biostimulating agents for the cleanup of oil-contaminated Desert Soils.
S.s. Radwan - One of the best experts on this subject based on the ideXlab platform.
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dynamics of bacterial populations during bench scale bioremediation of oily seawater and Desert Soil bioaugmented with coastal microbial mats
Microbial Biotechnology, 2016Co-Authors: Narjes Dashti, Salamah Salamah, N A Sorkhoh, Hussain Alawadhi, S.s. RadwanAbstract:This study describes a bench‐scale attempt to bioremediate Kuwaiti, oily water and Soil samples through bioaugmentation with coastal microbial mats rich in hydrocarbonoclastic bacterioflora. Seawater and Desert Soil samples were artificially polluted with 1% weathered oil, and bioaugmented with microbial mat suspensions. Oil removal and microbial community dynamics were monitored. In batch cultures, oil removal was more effective in Soil than in seawater. Hydrocarbonoclastic bacteria associated with mat samples colonized Soil more readily than seawater. The predominant oil degrading bacterium in seawater batches was the autochthonous seawater species M arinobacter hydrocarbonoclasticus. The main oil degraders in the inoculated Soil samples, on the other hand, were a mixture of the autochthonous mat and Desert Soil bacteria; X anthobacter tagetidis, P seudomonas geniculata, O livibacter ginsengisoli and others. More bacterial diversity prevailed in seawater during continuous than batch bioremediation. Out of seven hydrocarbonoclastic bacterial species isolated from those cultures, only one, M ycobacterium chlorophenolicum, was of mat origin. This result too confirms that most of the autochthonous mat bacteria failed to colonize seawater. Also culture‐independent analysis of seawater from continuous cultures revealed high‐bacterial diversity. Many of the bacteria belonged to the A lphaproteobacteria, F lavobacteria and G ammaproteobacteria, and were hydrocarbonoclastic. Optimal biostimulation practices for continuous culture bioremediation of seawater via mat bioaugmentation were adding the highest possible oil concentration as one lot in the beginning of bioremediation, addition of vitamins, and slowing down the seawater flow rate.
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Moderately thermophilic, hydrocarbonoclastic bacterial communities in Kuwaiti Desert Soil: enhanced activity via Ca^2+ and dipicolinic acid amendment
Extremophiles, 2015Co-Authors: D. M. Al-mailem, M. K. Kansour, S.s. RadwanAbstract:Pristine and oil-contaminated Desert Soil samples from Kuwait harbored between 10 and 100 cells g^−1 of hydrocarbonoclastic bacteria capable of growth at 50 °C. Enrichment by incubation of moistened Soils for 6 months at 50 °C raised those numbers to the magnitude of 10^3 cells g^−1. Most of these organisms were moderately thermophilic and belonged to the genus Bacillus ; they grew at 40–50 °C better than at 30 °C. Species belonging to the genera Amycolatopsis , Chelativorans , Isoptericola , Nocardia , Aeribacillus , Aneurinibacillus , Brevibacillus , Geobacillus , Kocuria , Marinobacter and Paenibacillus were also found. This microbial diversity indicates a good potential for hydrocarbon removal in Soil at high temperature. Analysis of the same Desert Soil samples by a culture-independent method (combined, DGGE and 16S rDNA sequencing) revealed dramatically different lists of microorganisms, many of which had been recorded as hydrocarbonoclastic. Many species were more frequent in the oil contaminated than in the pristine Soil samples, which may reflect their hydrocarbonoclastic activity in situ. The growth and hydrocarbon consumption potential of all tested isolates were dramatically enhanced by amendment of the cultures with Ca^2+ (up to 2.5 M CaSO_4). This enhanced effect was even amplified when in addition 8 % w / v dipicolinic acid was amended. These novel findings are useful in suggesting biotechnologies for waste hydrocarbon remediation at moderately high temperature.
Adan Trejo - One of the best experts on this subject based on the ideXlab platform.
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recycling waste debris of immobilized microalgae and plant growth promoting bacteria from wastewater treatment as a resource to improve fertility of eroded Desert Soil
Environmental and Experimental Botany, 2012Co-Authors: Adan Trejo, Luz E Debashan, Anton Hartmann, Juanpablo Hernandez, Michael Rothballer, M Schmid, Yoav BashanAbstract:Abstract This study attempted to demonstrate that biological residue from a new biological wastewater treatment is a resource for improving quality of arid Soils and plant growth. After tertiary wastewater treatment, debris composed of alginate beads containing the microalgae Chlorella sorokiniana and the plant growth-promoting bacterium Azospirillum brasilense was used as an amendment for eroded, infertile Desert Soil having low levels of organic matter. A. brasilense survived in these used dried beads for at least one year. Three consecutive applications of the dry debris increased organic matter, organic carbon, and microbial carbon in the Soil. Growth of sorghum in the amended Soil was greater than plants grown in low organic matter, untreated Soil or Soil amended with beads containing other combinations of alginate, microalgae, or bacteria. The surface of plant roots growing in the amended Soil was heavily colonized by A. brasilense, with no endophytic colonization; root tips were the preferred sites of colonization.
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recycling waste debris of immobilized microalgae and plant growth promoting bacteria from wastewater treatment as a resource to improve fertility of eroded Desert Soil
Environmental and Experimental Botany, 2012Co-Authors: Adan Trejo, Luz E Debashan, Anton Hartmann, Juanpablo Hernandez, Michael Rothballer, M Schmid, Yoav BashanAbstract:a b s t r a c t This study attempted to demonstrate that biological residue from a new biological wastewater treatment is a resource for improving quality of arid Soils and plant growth. After tertiary wastewater treatment, debris composed of alginate beads containing the microalgae Chlorella sorokiniana and the plant growth- promoting bacterium Azospirillum brasilense was used as an amendment for eroded, infertile Desert Soil having low levels of organic matter. A. brasilense survived in these used dried beads for at least one year. Three consecutive applications of the dry debris increased organic matter, organic carbon, and microbial carbon in the Soil. Growth of sorghum in the amended Soil was greater than plants grown in low organic matter, untreated Soil or Soil amended with beads containing other combinations of alginate, microalgae, or bacteria. The surface of plant roots growing in the amended Soil was heavily colonized by A. brasilense, with no endophytic colonization; root tips were the preferred sites of colonization. © 2011 Published by Elsevier B.V.
Narjes Dashti - One of the best experts on this subject based on the ideXlab platform.
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dynamics of bacterial populations during bench scale bioremediation of oily seawater and Desert Soil bioaugmented with coastal microbial mats
Microbial Biotechnology, 2016Co-Authors: Narjes Dashti, Salamah Salamah, N A Sorkhoh, Hussain Alawadhi, S.s. RadwanAbstract:This study describes a bench‐scale attempt to bioremediate Kuwaiti, oily water and Soil samples through bioaugmentation with coastal microbial mats rich in hydrocarbonoclastic bacterioflora. Seawater and Desert Soil samples were artificially polluted with 1% weathered oil, and bioaugmented with microbial mat suspensions. Oil removal and microbial community dynamics were monitored. In batch cultures, oil removal was more effective in Soil than in seawater. Hydrocarbonoclastic bacteria associated with mat samples colonized Soil more readily than seawater. The predominant oil degrading bacterium in seawater batches was the autochthonous seawater species M arinobacter hydrocarbonoclasticus. The main oil degraders in the inoculated Soil samples, on the other hand, were a mixture of the autochthonous mat and Desert Soil bacteria; X anthobacter tagetidis, P seudomonas geniculata, O livibacter ginsengisoli and others. More bacterial diversity prevailed in seawater during continuous than batch bioremediation. Out of seven hydrocarbonoclastic bacterial species isolated from those cultures, only one, M ycobacterium chlorophenolicum, was of mat origin. This result too confirms that most of the autochthonous mat bacteria failed to colonize seawater. Also culture‐independent analysis of seawater from continuous cultures revealed high‐bacterial diversity. Many of the bacteria belonged to the A lphaproteobacteria, F lavobacteria and G ammaproteobacteria, and were hydrocarbonoclastic. Optimal biostimulation practices for continuous culture bioremediation of seawater via mat bioaugmentation were adding the highest possible oil concentration as one lot in the beginning of bioremediation, addition of vitamins, and slowing down the seawater flow rate.
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Autochthonous bioaugmentation with environmental samples rich in hydrocarbonoclastic bacteria for bench-scale bioremediation of oily seawater and Desert Soil
Environmental Science and Pollution Research, 2016Co-Authors: Narjes Dashti, N A Sorkhoh, H. Al-awadhi, S. Salamah, Samir S. RadwanAbstract:Oil-contaminated seawater and Desert Soil batches were bioaugmented with suspensions of pea (Pisum sativum) rhizosphere and Soil with long history of oil pollution. Oil consumption was measured by gas-liquid chromatography. Hydrocarbonoclastic bacteria in the bioremediation batches were counted using a mineral medium with oil vapor as a sole carbon source and characterized by their 16S ribosomal RNA (rRNA)-gene sequences. Most of the oil was consumed during the first 2–4 months, and the oil-removal rate decreased or ceased thereafter due to nutrient and oxygen depletion. Supplying the batches with NaNO3 (nitrogen fertilization) at a late phase of bioremediation resulted in reenhanced oil consumption and bacterial growth. In the seawater batches bioaugmented with rhizospheric suspension, the autochthonous rhizospheric bacterial species Microbacterium oxidans and Rhodococcus spp. were established and contributed to oil-removal. The rhizosphere-bioaugmented Soil batches selectively favored Arthrobacter nitroguajacolicus, Caulobacter segnis, and Ensifer adherens. In seawater batches bioaugmented with long-contaminated Soil, the predominant oil-removing bacterium was the marine species Marinobacter hydrocarbonoclasticus. In Soil batches on the other hand, the autochthonous inhabitants of the long-contaminated Soil, Pseudomonas and Massilia species were established and contributed to oil removal. It was concluded that the use of rhizospheric bacteria for inoculating seawater and Desert Soil and of bacteria in long-contaminated Soil for inoculating Desert Soil follows the concept of “autochthonous bioaugmentation.” Inoculating seawater with bacteria in long-contaminated Soil, on the other hand, merits the designation “allochthonous bioaugmentation.”