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bioremediation of nitrogen-and phosphorus-polluted aquaculture sediment by utilizing combined immobilized effective microorganisms and sediment aeration technology

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International Journal of Agricultural and Biological Engineering 2019年第6期12卷 192-201页

作者： Liangkai Wang Xiaohou Shao Ming Xu Shuang Chen College of Agricultural Engineering Hohai UniversityNanjing 210098China Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China of Ministry of Education Hohai UniversityNanjing 210098China Jiangsu Provincial Academy of Environment Science Nanjing 210000China

The endogenous release of nitrogen and phosphorus from aquaculture sediment can continuously pollute the water quality in aquaculture ponds.In this study,an integrated bioremediation approach that combined effective microorganisms(EM)with aeration techniques was designed to restore contaminated aquaculture sediment.Initially,a set of laboratory-scale experiments was designed to evaluate the feasibility of the technology for the bioremediation of nitrogen and phosphorus.The removal and transformation efficiency indexes of both the overlying water and sediment were measured.From the obtained results,the combination of sediment aeration and immobilized EM significantly improved the nitrogen and phosphorus removal rate from the overlying water and sediment when compared to other methods.Subsequently,a series of field-scale experiments was further implemented to assess the integrated technique in practical applications.In field experiments,the variation in the comprehensive trophic level index(TLI)and sediment biodegradation activities(G value)was used to assess the effect of sediment bioremediation.In pond II which promotes sediment biodegradation,the values of TLI varied from 70.13 to 54.16,and the classification level changed from Hypereutrophic to a Light eutrophic.In addition,the G value increased from 0.98 kg/(kg·h)to 2.12 kg/(kg·h).The organic matter(OM)and sediment thickness(ST)decreased by 17.4 g/kg and 2.3 cm,respectively.The obtained results indicated that the combination of EM and sediment aeration might be feasible and effective for the remediation of nitrogen-and phosphorus-polluted aquaculture sediment.

关键词： effective microorganisms immobilization technology aeration aquaculture sediment bioremediation

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Evaluation of biostimulation and Tween 80 addition for the bioremediation of long-term DDT-contaminated soil

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Journal of Environmental Sciences 2015年第2期27卷 101-109页

作者： Bibiana Betancur-Corredor Nancy J.Pino Santiago Cardona Gustavo A.Peuela GDCON Research Group Faculty of Engineering University Research Headquarters (SIU) University of Antioquia School of Geosciences and Environment Faculty of Mines National University of Colombia School of Microbiology University of Antioquia

The bioremediation of a long-term contaminated soil through biostimulation and surfactant addition was evaluated. The concentrations of 1,1,1-trichloro-2,2-bis（4-chlorophenyl）ethane（DDT） and its metabolites 1,1-dichloro-2,2-bis（4-chlorophenyl） ethane（DDD） and1,1-dichloro-2,2-bis（4-chlorophenyl） ethylene（DDE） were monitored during an 8-week remediation process. Physicochemical characterization of the treated soil was performed before and after the bioremediation process. The isolation and identification of predominant microorganisms during the remediation process were also carried out. The efficiency of detoxification was evaluated after each bioremediation protocol. Humidity and p H and the heterotrophic microorganism count were monitored weekly. The DDT concentration was reduced by 79% after 8 weeks via biostimulation with surfactant addition（B ＋ S） and 94.3%via biostimulation alone（B）. Likewise, the concentrations of the metabolites DDE and DDD were reduced to levels below the quantification limits. The microorganisms isolated during bioremediation were identified as Bacillus thuringiensis, Flavobacterium sp., Cuprivadius sp.,Variovorax soli, Phenylobacterium sp. and Lysobacter sp., among others. Analysis with scanning electron microscopy（SEM） allowed visualization of the colonization patterns of soil particles. The toxicity of the soil before and after bioremediation was evaluated using Vibrio fischeri as a bioluminescent sensor. A decrease in the toxic potential of the soil was verified by the increase of the concentration/effect relationship EC50 to 26.9% and 27.2% for B ＋ S and B, respectively, compared to 0.4% obtained for the soil before treatment and 2.5%by natural attenuation after 8 weeks of treatment.

关键词： DDT Soil bioremediation Biostimulation Surfactant Toxicity

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Distribution of polychlorinated biphenyls in effluent from a large municipal wastewater treatment plant: Potential for bioremediation?

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Journal of Environmental Sciences 2019年第4期31卷 42-52页

作者： Ran Jing Soliver Fusi Alisha Chan Staci Capozzi Birthe V.Kjellerup University of Maryland at College Park Department of Civil and Environmental Engineering

This study involved an evaluation of the potential for bioremediation of polychlorinated biphenyls(PCBs) in the effluent from a large municipal wastewater treatment plant. It was focused on the presence of PCBs in two types of effluents: the continuous effluent present during dry weather conditions and the intermittently present effluent that was present during wet weather due to incoming stormwater. The annual discharge of PCBs for both types of effluent was calculated based on a five-year dataset(2011–2015). In addition, the toxicity and bioremediation potential of the PCBs in the effluent were also assessed. It was found that the continuous effluent was responsible for the majority of the discharged PCB into the receiving river(1821 g for five years), while the intermittent effluent contributed 260 g over the five years.The average number of chlorine per biphenyl for the detected PCB congeners showed a 19%difference between the two types of effluent, which indicated a potential for organohalide respiration of PCBs during the continuous treatment. This was further supported by a high level of tri-, tetra-and penta-chlorinated congeners accounting for 75% of the anaerobically respired PCBs. Potential for aerobic degradation and thus biomineralization of PCBs was identified for both effluents. Furthermore, toxicity of 12 dioxin-like PCBs showed that normal operation of the wastewater reduced the toxicity throughout the wastewater treatment plant.

关键词： bioremediation Toxicity Organohalide respiration Polychlorinated biphenyl(PCBs) Wastewater treatment

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Microbial changes in rhizospheric soils contaminated with petroleum hydrocarbons after bioremediation

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Journal of Environmental Sciences 2004年第6期16卷 987-990页

作者： LINXin LIPei-jun ZHOUQi-xing XUHua-xia ZHANGHai-rong KeyLboratoryofTerrestrialEcologicalProcess InstituteofAppliedEcologyChineseAcademyofSciencesShenyang110016China GraduateSchoolofChineseAcademyofSciences Beijing100039China

Effects of bioremediation on microbial communities in soils contaminated with petroleum hydrocarbons are a scientific problem to be solved. Changes in dominate microbial species and the total amount of microorganisms including bacteria and fungi in rhizospheric soils after bioremediation were thus evaluated using field bioremediation experiments. The results showed that there were changed dominant microorganisms including 11 bacterial strains which are mostly Gram positive bacteria and 6 fungal species which were identified. The total amount of microorganisms including bacteria and fungi increased after bioremediation of microbial agents combined with planting maize. On the contrary, fungi in rhizospheric soils were inhibited by adding microbial agents combined with planting soybean.

关键词： bioremediation rhizosphere microbial community contaminated soil petroleum hydrocarbon

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Isolation and characterization of atrazine-degrading Arthrobacter sp. AD26 and use of this strain in bioremediation of contaminated soil

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Journal of Environmental Sciences 2008年第10期20卷 1226-1230页

作者： Li Qingyan Li Ying Zhu Xikun Cai Baoli Nankai Univ Dept Microbiol Tianjin 300071 Peoples R China Nankai Univ Minist Educ Key Lab Bioact Mat Tianjin 300071 Peoples R China

A bacterial strain (AD26) capable of utilizing atrazine as a sole nitrogen source for growth was isolated from an industrial wastewater sample by enrichment culture. The 16S rRNA gene sequencing identified AD26 as an Arthrobacter sp. PCR assays indicated that AD26 contained atrazine-degrading genes trzN and atzBC. The trzN gene of AD26 only differs from the trzN of Arthrobacter aurescens TC1 by one base (A→T at 907) and one amino acid (Met→Leu at 303). The specific activity of trzN of AD26 in crude cell ext...

关键词： atrazine biodegradation Arthrobacter sp. AD26 trzN gene bioremediation

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Effects of nitrate concentration in interstitial water on the bioremediation of simulated oil-polluted shorelines

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Journal of Environmental Sciences 2007年第12期19卷 1491-1495页

作者： XIA Wen-xiang LI Jin-cheng SONG Zhi-wen SUN Ying-jie Department of environmental engineering Qingdao Technological University Qingdao 266033 China.

Nutrient addition has been proved to be an effective strategy to enhance oil biodegradation in marine shorelines. To determine the optimal range of nutrient concentrations in the bioremediation of oil-polluted beaches, nitrate was added to the simulated shoreline models in the initial concentration of 1, 5 and 10 mg/L. Whenever the NO3-N concentration declined to 70% of its original value, additional nutrients were supplemented to maintain a certain range. Results showed adding nutrients increased the oil biodegradation level, the counts of petroleum degrading bacteria （PDB） and heterotrophic bacteria （HB）, and the promoted efficiency varied depending on the concentration of nitrate. Oil degradation level in 5 mg/L （NO3-N） group reached as much as 84.3% accompanied with the consistently highest counts of PDB; while in l mg/L group oil removal efficiency was only 35.2%, and the numbers of PDB and HB were relatively low compared to the other groups supplemented with nutrients. Although counts of HB in the 10 mg/L group were remarkable, lower counts of PDB resulted in poorer oil removal efficiency （70.5%） compared to 5 mg/L group. Furthermore, it would need more NO3-N （0.371 mg） to degrade 1 mg diesel oil in the 10 mg/L group than in the 5 mg/L group （0.197 mg）. In conclusion, Nitrate concentration in 5 mg/L is superior to l and 10 mg/L in the enhancement of diesel oil biodegradation in simulated shorelines.

关键词： diesel oil 0# bioremediation nutrient concentration interstitial water

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Changes in bacterial community of anthracene bioremediation in municipal solid waste composting soil

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第9期12卷 760-768页

作者： Shu-ying ZHANG Qing-feng WANG Rui WAN Shu-guang XIE College of Environmental Sciences and Engineering Peking UniversityBeijing 100871China

Polycyclic aromatic hydrocarbons(PAHs) are common contaminants in a municipal solid waste(MSW) composting site.Knowledge of changes in microbial structure is useful to identify particular PAH degraders.However,the microbial community in the MSW composting soil and its change associated with prolonged exposure to PAHs and subsequent biodegradation remain largely unknown.In this study,anthracene was selected as a model compound.The bacterial community structure was investigated using terminal restriction fragment length polymorphism(TRFLP) and 16S rRNA gene clone library analysis.The two bimolecular tools revealed a large shift of bacterial community structure after anthracene amendment and subsequent biodegradation.Genera Methylophilus,Mesorhizobium,and Terrimonas had potential links to anthracene biodegradation,suggesting a consortium playing an active role.

关键词：蒽微生物引起的社区 Biodegradation bioremediation

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Merits and limitations of TiO2-based photocatalytic pretreatment of soils impacted by crude oil for expediting bioremediation

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Frontiers of Chemical Science and Engineering 2017年第3期11卷 387-394页

作者： Yu Yang Hassan Javed Danning Zhang Deyi Li Roopa Kamath Kevin McVey Kanwartej Sra Pedro J.J. Alvarez Department of Civil and Environmental Engineering Rice University Houston TX 77005 USA Department of Chemistry Rice University Houston TX 77005 USA Department of Civil and Environmental Engineering Tongji University Shanghai 200092 China Chevron Energy Technology Company Houston TX 77002 USA

Heavy hydrocarbons （HHCs） in soils impacted by crude oil spills are generally recalcitrant to biodegrada- tion due to their low bioavailability and complex chemical structure. In this study, soils were pretreated with varying concentrations of ultraviolet radiation A （UVA） or ultraviolet radiation C （UVC） activated titanium dioxide （TiO2）（1%-5%） under varying moisture conditions （0%- 300% water holding capacity （WHC）） to enhance biodegradation of HCCs and shorten remediation time- frames. We demonstrate that pretreatment of impacted soils with UVC-activated TiO2 in soil slurries could enhance bioremediation of HHCs. Total petroleum hydrocarbon （TPH） removal after 24 h exposure to UVC （254 nm and 4.8 mW/cm2） was （19.15：1.6）% in slurries with 300% WHC and 5 wt-% TiO2. TPH removal was non-selective in the C15-C36 range and increased with moisture content and TiO2 concentration. In a 10-d bioremediation test, TPH removal in treated soil increased to （26.05：0.9）%, compared to （15.45：0.8）% for controls without photo- catalytic pre-treatment. Enhanced biodegradation was also confirmed by respirometry. This suggests that addition of UVC-activated TiO2 to soil slurries can transform recalcitrant hydrocarbons into more bioavailable and biodegradable byproducts and increase the rate of subsequent biodegradation. However, similar results were not observed for soils pretreated with UVA activated TiO2. This suggests that activation of TiO2 by sunlight and direct addition of TiO2 to unsaturated soils within landfarming setting may not be a feasible approach. Nevertheless, less than 1% of UVA （7.5 mW/cm2） or UVC （1.4 mW/cm2） penetrated beyond 0.3 cm soil depth, indicating that limited light penetration through soil would hinder the ability of TiO2 to enhance soil bioremediation under land farming conditions.

关键词： ZiO2 pretreatment bioremediation total petroleum hydrocarbons ultraviolet

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Advances in engineered Bacillus subtilis biofilms and spores, and their applications in bioremediation, biocatalysis, and biomaterials

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Synthetic and Systems Biotechnology 2021年第3期6卷 180-191页

作者： Muhammad Zubair Mohsin Rabia Omer Jiaofang Huang Ali Mohsin Meijin Guo Jiangchao Qian Yingping Zhuang State Key Laboratory of Bioreactor Engineering East China University of Science and TechnologyShanghai 200237PR China

Bacillus subtilis is a commonly used commercial specie with broad applications in the fields of bioengineering and biotechnology.B.subtilis is capable of producing both biofilms and spores.Biofilms are matrix-encased multicellular communities that comprise various components including exopolysaccharides,proteins,extracellular DNA,and poly-γ-glutamic acid.These biofilms resist environmental conditions such as oxidative stress and hence have applications in bioremediation technologies.Furthermore,biofilms and spores can be engineered through biotechnological techniques for environmentally-friendly and safe production of bio-products such as enzymes.The ability to withstand with harsh conditions and producing spores makes Bacillus a suitable candidate for surface display technology.In recent years,the spores of such specie are widely used as it is generally regarded as safe to use.Advances in synthetic biology have enabled the reprogramming of biofilms to improve their functions and enhance the production of value-added products.Globally,there is increased interest in the production of engineered biosensors,biocatalysts,and biomaterials.The elastic modulus and gel properties of B.subtilis biofilms have been utilized to develop living materials.This review outlines the formation of B.subtilis biofilms and spores.Biotechnological engineering processes and their increasing application in bioremediation and biocatalysis,as well as the future directions of B.subtilis biofilm engineering,are discussed.Furthermore,the ability of B.subtilis biofilms and spores to fabricate functional living materials with self-regenerating,self-regulating and environmentally responsive characteristics has been summarized.This review aims to resume advances in biological engineering of B.subtilis biofilms and spores and their applications.

关键词： Bacillus subtilis Biofilms Spores Biocatalysis bioremediation Biomaterials Synthetic biology

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Status quo of soil petroleum contamination and evolution of bioremediation

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Petroleum Science 2011年第4期8卷 502-514页

作者： Du Weidong Wan Yunyang Zhong Ningning Fei Jiajia ZhangZhihuan Chen Lijun Hao Jiming State Key Laboratory of Petroleum Resource and Prospecting College of Geosciences China University of Petroleum Beijing 102249 China Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China

Along with the rapid development of oil industries internationally,petroleum prospecting and exploitation activities are growing intensively.Especially in China,with the fastest economic growth in the world and shortage of petroleum resources,we are leading the practices of petroleum deep exploitation.Obviously,the risk of damage to the natural environment from these activities is high.Oil contamination in soils and groundwater is becoming a big issue along with pesticide pollution,which makes organic pollution prevention and control （OPPC） much more complex.In this paper,based on recent research on oil-contaminated soil at home and abroad,we make comments on the remediation technologies for polluted soil,emphasizing bioremediation techniques and degradation mechanisms in order to push forward research into bound organic pollution prevention and control （OPPC）,especially in China.

关键词： Soil pollution crude oil bioremediation organic pollution biotransformation polycyclic aromatic hydrocarbons

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