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Effects of rhamnolipids on bacterial communities in a dioxin-contaminated soil and the gut of earthworms added to the soil

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Pedosphere 2023年第6期33卷 927-937页

作者： Bing XIA Dan HUANG Mao YE Hao QIU Hongfeng CHEN Keqiang ZHAO Rongliang QIU Rongrong YING Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection(NIES) Nanjing 210042China Research Academy of Environmental Sciences of Anhui Province Hefei 230071China College of Environmental and Resource Sciences Zhejiang UniversityHangzhou 310058China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Shanghai Jiao Tong University School of Environmental Science and EngineeringShanghai 200240China Guangdong Laboratory for Lingnan Modern Agriculture College of Natural Resources and EnvironmentSouth China Agricultural UniversityGuangzhou 510642China

The biosurfactants rhamnolipids and the “soil ecosystem engineers” earthworms are often used to remediate contaminated soils. However, the effects of rhamnolipids on earthworm intestinal flora and microbial community in soil containing earthworms are not clearly understood. In our study, a 21-d microcosm experiment was carried out to reveal the effects of rhamnolipids on microbial abundance, composition, and metabolism, as well as contaminant degradation capacity. Both rhamnolipids and earthworms had positive effects on soil bacteria. Rhamnolipid-amended soil(RT) showed higher bacterial abundance and metabolic activity than earthworm-amended soil(ET), while the improvement in bacterial composition and contaminant degradation capacity by rhamnolipids was lower than that by earthworms. Notably, these effects were further amplified by the combined treatment of rhamnolipids and earthworms(RET). Specifically, the bacterial abundance(log-transferred) increased from 9.5 copies g-1in the control with no addition to 10.3, 10.6, and 11.1 copies g-1in ET, RT, and RET, respectively. Compared to ET, the relative abundance of the dominant phylum, Proteobacteria, increased from 41.66% to 51.67% in RET,and more pollutant-degrading bacteria were also enriched in RET. Therefore, the increases in bacterial abundance and contaminant-degrading bacteria led to the following ranking of soil dioxin removal rate: RET(77.28%) > ET(59.83%) > RT(24.65%) > control(4.71%). Moreover, the addition of rhamnolipids enhanced the abundance of bacterial functional genes involved in metabolism and environmental information processing. In addition, the composition and diversity of bacteria in the gut of earthworms were conspicuously affected by rhamnolipids, and the relative abundance of Microbacterium and Shewanella increased significantly(P < 0.05). Therefore, this study revealed that rhamnolipids remarkably influenced the abundance, composition, and metabolism of the microbial community in earthworm gut, further promoting the degradation rate of di

关键词： bioremediation biosurfactant contaminant-degrading bacteria intestinal bacteria metabolic pathway metabolism microcosm experiment soil pollution

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Remediation of polycyclic aromatic hydrocarbon-contaminated soils using microbes and nanoparticles: A review

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Pedosphere 2023年第1期33卷 93-104页

作者： Ritu PANWAR Jyoti MATHUR Department of Bioscience and Biotechnology Banasthali VidyapithRajasthan 304022India

Polycyclic aromatic hydrocarbon(PAH)pollution is a global concern because of their toxicity to environment and ecosystem,which induces adverse effects on plants,animals,and humans.Hydrocarbons are mainly released from natural and anthropogenic activities,such as incomplete fuel combustion,leakages in oil pipelines,and the extensive use of pesticides;PAH contaminants include petroleum hydrocarbons(PHCs),halogenated hydrocarbons,chlorophenols,and pesticides.bioremediation using microorganisms such as bacteria and fungi is developing as an effective and promising technique to remediate PAHs from the environment.Owing to their remediation efficiency,this method is environmentally friendly and represents a novel approach for reducing the risk of PAHs to human health and the ecosystem.Nanoparticles may be applied in bioremediation,and will not only induce fewer toxic effects but also reduce the effective overall time and costs involved.This article provides a summary of the application of nanomaterials,bacteria,and fungi to PAH remediation;we review and briefly discuss the structure,properties,sources,fate,toxicity,and remediation approaches involved in the remediation of PAH-polluted sites.

关键词： bioremediation microorganisms pesticides persistent organic pollutants petroleum hydrocarbons

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A highly effective polycyclic aromatic hydrocarbon-degrading bacterium,Paracoccus sp.HPD-2,shows opposite remediation potential in two soil types

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Pedosphere 2022年第5期32卷 673-685页

作者： Wei CHEN Ying TENG Wenjie REN Yongming LUO Yao YU Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210018(China) Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural SciencesNanjing 210014(China) School of Resources and Environmental Engineering Hefei University of TechnologyHefei 230009(China)

Bioaugmentation is an efficient and eco-friendly strategy for the bioremediation of polycyclic aromatic hydrocarbons(PAHs).Since the degrading abilities of soils can greatly alter the abilities of PAH-degrading bacteria,illustrating the potential and mechanism of highly efficient degrading bacteria in different soil environments is of great importance for bioremediation.A PAH-degrading bacterium,Paracoccus aminovorans HPD-2,and two soil types,red and paddy soils,with distinct PAH-degrading abilities,were selected for this study.A soil microcosm experiment was performed by adding pyrene(PYR)and benzo[a]pyrene(B[a]P).Illumina sequencing was used to examine bacterial community structure.The results showed that inoculation with HPD-2 significantly elevated PYR and B[a]P degradation rates by 44.7%and 30.7%,respectively,in the red soil,while it only improved the degradation rates by 1.9%and 11%,respectively,in the paddy soil.To investigate the underlying mechanism,the fate of strain HPD-2 and the response of the indigenous bacterial communities were determined.Strain HPD-2 occupied certain niches in both soils,and the addition of the bacterium changed the native community structure more noticeably in the red soil than in the paddy soil.The addition of PAHs and strain HPD-2 significantly changed the abundances of 7 phyla among the 15 detected phyla in the red soil.In the paddy soil,5 of the 12 dominant phyla were significantly affected by PAHs and the inoculation of HPD-2,while 6new phyla were detected in the low-abundance phyla(<0.1%).The abundances of Massilia,Burkholderia,and Rhodococcus genera with PAH degradation efficiency were significantly increased by the inoculation of HPD-2 in the red soil during 42 d of incubation.Meanwhile,in the paddy soil,the most dominant effective genus,Massilia,was reduced by HPD-2 inoculation.This research revealed the remediation ability and inherent mechanism of the highly effective PAH-degrading strain HPD-2 in two different soil types,which would provide a theoretical basis for th

关键词： bacterial inoculation benzo[a]pyrene bioremediation organic contaminant paddy soil Paracoccus aminovorans pyrene red soil

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Plant-and microbe-assisted biochar amendment technology for petroleum hydrocarbon remediation in saline-sodic soils: A review

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Pedosphere 2022年第1期32卷 211-221页

作者： Kudakwashe MEKI Qiang LIU Shuai WU Yanfei YUAN Institute of Coastal Environmental Pollution Control Key Laboratory of Marine Environment and EcologyMinistry of EducationInstitute for Advanced Ocean StudyOcean University of ChinaQingdao 266100China

Soil degradation through salinization and pollution by toxic compounds such as petroleum hydrocarbons(PHCs) in the coastal wetlands has become a significant threat to ecosystem health, biodiversity, and food security. However, traditional remediation technologies can generate secondary pollutants, incur high operating costs, and consume significant quantities of energy. bioremediation, using plants, biochar, and microbes, is an innovative and cost-effective option to remediate contaminated soils. Biochar, as a plant/microbe growth enhancer, is a promising green approach for the sustainable phytoremediation of PHCs in salinized soils. This review therefore summarizes the effect of plant-and microbe-assisted biochar amendment technology for the remediation of PHCs and salinization. Plant-microbe interactions mediated rhizodegradation despite increasing hydrocarbon sorption. Overall, microbial respiration is more active in biochar amendments, due to faster biodegradation of PHCs and improved soil properties. The use of biochar, plants, and microbes is recommended,as it offers a practical and sustainable option, both ecologically and economically, for the remediation of PHCs and excess salinity. Further development of new green technologies is to be encouraged.

关键词： bioremediation microbial community petrochemical pollution phytoremediation salinity

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Prospecting microbial biofilms as climate smart strategies for improving plant and soil health: A review

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Pedosphere 2023年第1期33卷 129-152页

作者： Kulandaivelu VELMOUROUGANE Shobit THAPA Radha PRASANNA Division of Crop Production Indian Council of Agricultural Research-Central Institute for Cotton Research(CICR)Nagpur 440010India Indian Council of Agricultural Research-National Bureau of Agriculturally Important Microorganisms KushmaurMau Nath Bhanjan 275103India Division of Microbiology Indian Council of Agricultural Research-Indian Agricultural Research InstituteNew Delhi 110012India

Microbes and their products play key roles in complementing chemical fertilizers and plant protection chemicals by eliciting defence mechanisms in crop plants,thereby providing immunity and resistance against diverse stresses.Among the different environmental technologies used to mitigate climate change,several microbiological interventions are promising,among which biofilms,both naturally-existing and laboratory-developed,and their application have gained momentum recently.Microbial biofilms are aggregations of microbial cells in a self-generated polymeric matrix,which are produced by several genera of bacteria,yeasts,cyanobacteria,and fungi as a mode of reproductive fitness,thereby advantageous in successful proliferation,even in extreme environments.The propensity of microbial biofilms to grow in diverse niches and adapt to biotic and abiotic stresses illustrates their immense potential as biofertilizers and disease suppression options in various crops across diverse ecologies.In the inhospitable habitats of deserts and denudated land,biofilms play an important role in preventing soil erosion and sustaining vegetation,microflora,and fauna.Biofilms represent a mode of growth for several microbes with plant growth-promoting and biocontrol potential,which are important in seed establishment and the facilitation of exchanging nutrients and metabolites from the environment.In this review,we discuss the prospects of microbial biofilms as a green option in agriculture in general and,more specifically,their potential in mitigating climate change.

关键词： biocontrol bioremediation climate change environmental stress nutrient sequestration plant growth promotion

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Screening of PCBs-degrading Bacteria and Enhanced bioremediation of Soil under Low-temperature Condition

Screening of PCBs-degrading Bacteria and Enhanced Bioremedia...

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2011 International Symposium on Water Resource and Environmental Protection(ISWREP 2011)

作者： AN Yong-lei ZHANG Lan-ying QIU Ming-ying ZHOU Ai-xia ZHU Jin-rong ZHANG Lei REN He-jun Key Laboratory of Groundwater Resources and Environment Ministry of Education Jilin University

ISBN: (纸本)9781612843377

Two low-temperature PCBs （polychlorinated biphenyls）-degrading strains were isolated from the long-term PCBs-contaminated soil and named strain P and strain Q which could utilize the PCBs as the sole carbon source and energy source.These two strains were identified by 16S rDNA sequence analysis.PCBs-degrading ability of these two strains was investigated by resting cell experiment and the bioremediation of PCBs-contaminated soil was simulated in laboratory.The results showed that strain P was initially identified as Sphingomonas sp.and strain Q was initially identified as Pseudomonas sp.,both Strain P and strain Q had greater ability to degrade the low-chlorinated PCBs than the high-chlorinated PCBs.The highest removal rate of PCBs single-component by strain P was 77% while strain Q was 99%.The PCBs-degrading ability of strain Q was approximately 20%～30% higher than strain P.When two strains worked together in soil,the PCBs,especially the high-chlorinated PCBs could be removed more effectively.After adding surfactant hydroxypropyl-β-cyclodextrin to the bioremediation system of PCBs-contaminated soil,the growth of strain P did not change significantly while the biomass of strain Q increased obviously,and the removal rate of PCBs was twice more than not adding hydroxypropyl-β-cyclodextrin.Adding surfactant made the total removal rate of PCBs reached above 57%,which indicated that adding hydroxypropyl-β-cyclodextrin was conducive to the bioremediation of PCBs-contaminated soil.

关键词： polychlorinated biphenyls degrading bacteria bioremediation low-temperature

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bioremediation of petroleum polluted soil by combination of rye grass with effective microorganisms

Bioremediation of petroleum polluted soil by combination of ...

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2009 International Conference on Environmental Science and Information Application Technology

作者： Jingchun Tang Xiaowei Niu Qing Sun Rugang Wang College of Environmental Science and Engineering (Key Laboratory of Pollution Processes and Environmental Criteria Ministry of Education) Nankai University Tianjin China

bioremediation of petroleum polluted soil using combination of plant ryegrass and effective microbial group was carried out by pot experiment. The results show the degradation rate of 58% using combined treatment of plant and microorganisms after 162 days with enhancing of total petroleum hydrocarbon （TPH） degradation by 17% as compared to the control. The lower pH value and higher enzyme activity in different bioremediation processes compared to blank suggests the effectiveness of combination of effective microorganisms with ryegrass. The fraction analysis indicates a priority of low molecular hydrocarbon degradation in combination of microorganisms and ryegrass, polar fraction degradation in phytoremediation, and aromatic fraction in microbial degradation.

关键词： Petroleum polluted soil bioremediation ryegrass microorganism enzyme activity

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Applications of Microalgae in Five Areas of Biotechnology

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国际实验植物学杂志(英文) 2023年第10期92卷 2737-2759页

作者： Héctor Alejandro Reza-Solis Ofelia Adriana Hernández-Rodríguez Andrés Francisco Martínez-Rosales Dámaris Leopoldina Ojeda-Barrios Facultad de Ciencias Agrotecnológicas Universidad Autónoma de ChihuahuaChihuahua31000Mexico Facultad de Zootecnia y Ecología Universidad Autónoma de ChihuahuaChihuahua33820Mexico

Microalgae are mostly photoautotrophic microscopic organisms.According to their cellular structure,they are classified into two types,eukaryotes,and prokaryotes,and they are distributed in all types of ecosystems,presenting unique qualities due to the fact that they synthesize high value-added molecules used in various productive and environmental activities,and because their biomass is used as raw material to obtain various products.Therefore,the objective of this review was to collect,organize,and collate current information on the use of microalgae in the development of biotechnology involving the areas of agriculture,health,food,bioremediation,and biofuels.The results show that the microalga Chlorella stands out for its multiple uses in the five areas considered in this study.The search for healthier and more environmentally friendly technologies has contributed to the development of new biotechnological applications that require the study and incorporation of specialized microorganisms to replace and/or improve existing applications.

关键词： Agriculture health food bioremediation biofuels

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A Review Article: Electrokinetic bioremediation Current Knowledge and New Prospects

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Advances in Microbiology 2016年第1期6卷 57-72页

作者： Ikrema Hassan Eltayeb Mohamedelhassan Ernest K. Yanful Ze-Chun Yuan Department of Civil Engineering Western University London Canada Southern Crop Protection and Food Research Centre Agriculture and Agri-Food Canada London Canada Department of Civil Engineering Lakehead University Thunder Bay Canada Department of Microbiology and Immunology Western University London Canada

This study discusses factors affecting various processes involved in bioremediation coupled with electrokinetics. The study presents innovative solutions, and proposes new directions. Environmental conditions that have an influence on the characteristics, behavior, and metabolism of indigenous microorganisms are presented. The discussion focuses on overcoming the unfavorable conditions created by electrolysis reactions, prolongation the survival of the microbes at contaminated sites, increase of microbial enzyme secretion, improvement of the indigenous bacteria metabolic pathways, and exploration of metagenomics resources from soil biota. The challenge facing the implementation of conventional bioremediation techniques in precisely and effectively delivering nutrients to indigenous bacteria, particularly in soils with tortuous paths and low hydraulic conductivity is discussed. Current knowledge in application of enhanced biostimulation using electrokinetics is reviewed. The implementation of bioaugmentation in bioremediation coupled with electrokinetics to enhance the outcome of bioremediation is presented. Effects of phenomena associated with electrokinetics in the hybrid remediation approach are discussed.

关键词： bioremediation Bioaugmentation Biostimulation Electokinetics Contamination

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Biochar for removal of dyes in contaminated water:an overview

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Biochar 2022年第1期4卷 1024-1039页

作者： Saravanan Praveen Josephraj Jegan Thillainayagam Bhagavathi Pushpa Ravindiran Gokulan Laura Bulgariu Department of Civil Engineering CMR Institute of TechnologyBengaluru 560037KarnatakaIndi Department of Civil Engineering University College of EngineeringRamanathapuram 623513Tamil NaduIndia Department of Civil Engineering GMR Institute of TechnologyRajamSrikakulam 532127Andhra PradeshIndia Department of Environmental Engineering and Management “Cristofor Simionescu”Faculty of Chemical Engineering and Environmental ProtectionGheorghe Asachi Technical University of Iaşi700050 IaşiRomania

In recent years,numerous investigations have explored the use of biochar for the removal of organic and inorganic pollutants in single component systems.Biochar is a carbonaceous material produced from waste biomass,mainly by thermochemical conversion methods.This material was used as a biosorbent in various removal processes of pollutants,and its efficiency was strongly influenced by the characteristics of the biomass feedstock.This review integrates the recent works of literature to understand the biosorption behaviour of dyes onto biochar-based biosorbents.The factors influencing the biosorption process and the mechanisms describing the biosorption behaviours of the biochar have been broadly reviewed.Furthermore,the biosorption models can be used to comprehend the competence of the biochar as biosorbent for dye removal techniques.

关键词： Biomass bioremediation Biosorption Biosorbent

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