Enhancing pentachlorophenol degradation by vermicomposting associated bioremediation

Zhong, Liang; Bai, Jing; Zhen, Zhen; Lao, Shiqi; Li, Wenyan; Wu, Zhihao; Li, Yongtao; Spiro, Baruch; Zhang, Dayi

doi:10.1016/j.ecoleng.2015.12.004

Cited by 40 publications

(13 citation statements)

References 30 publications

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“…between microorganisms and reactants (Lin et al, 2016b). Additionally, earthworms also increase soil microbial activities via digesting organic matters and improving nutrient availability (Lin et al, 2016a). Thus, vermicomposting treatments with earthworms can ameliorate soil properties, offset the limitations in bioaugmentation, and consequently improve the pollutants removal efficiency (Li et al, 2015;Lin et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, earthworms also increase soil microbial activities via digesting organic matters and improving nutrient availability (Lin et al, 2016a). Thus, vermicomposting treatments with earthworms can ameliorate soil properties, offset the limitations in bioaugmentation, and consequently improve the pollutants removal efficiency (Li et al, 2015;Lin et al, 2016a). Lin et al (2016a) reported earthworms significantly enhance the pentachlorophenol (PCP) degradation by improving soil physicochemical properties and increasing microbial biomass and activities.…”

Section: Introductionmentioning

confidence: 99%

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Effects of two ecological earthworm species on atrazine degradation performance and bacterial community structure in red soil

et al. 2018

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Vermicomposting is an effective and environmentally friendly approach for eliminating soil organic contamination. Atrazine is one of the most commonly applied triazinic herbicides and frequently detected in agricultural soils. This study investigated the roles and mechanisms of two earthworm species (epigeic Eisenia foetida and endogeic Amynthas robustus) in microbial degradation of atrazine. Both earthworms accelerated atrazine degradation performance from 39.0% in sterile soils to 94.9%-95.7%, via neutralizing soil pH, consuming soil humus, altering bacterial community structure, enriching indigenous atrazine degraders and excreting the intestinal atrazine-degrading bacteria. Rhodoplanes and Kaistobacter were identified as soil indigenous degraders for atrazine mineralization and stimulated by both earthworm species. A. robustus excreted the intestinal Cupriavidus and Pseudomonas, whereas Flavobacterium was released by E. foetida. This study provides a comprehensive understanding of the distinct effects of two earthworm species on soil microbial community and atrazine degradation, offering technical supports to apply vermicomposting in effective soil bioremediation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of two ecological earthworm species on atrazine degradation performance and bacterial community structure in red soil

et al. 2018

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Section: Environmental Benefits Of Vermicompostmentioning

confidence: 99%

“…Vermicompost also degraded pentachlorophenol (PCP), a chemical used in an agricultural field. The degradation of the PCP was made possible through the presence of the humic fraction of the vermicomposts and the formation of a PCP-humus complex, which was then decomposed by neutralizing the pH of the soils(Lin et al, 2016).Vermicompost microbial activities have resulted in reductions in concentrations of various herbicides and heavy metals present in the soils. Vermicompost application decreased the concentration of cadmium ion (1+) (Cd + ) and copper ion (1+) (Cu + ) in tropical soils(Jordão et al, 2011).…”

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confidence: 99%

Vermicomposting: A sustainable tool for environmental equilibria

Singh

2017

Environmental Quality Mgmt

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Improperly managed organic waste constitutes a serious environment threat across the globe. This has led to a worldwide struggle to strike a balance between the rapid generation of such wastes and protection of the environment. With the unique advantages of lower operational and maintenance costs compared with other waste management technologies, the use of vermicomposting to manage organic wastes has been increasing rapidly in recent years. Still, some factors (e.g., characteristics of substrate composition before and after treatment) are in need of additional, specific studies so that researchers can better understand the metabolism involved in the process. Vermicomposting provides employment opportunities as it protects the environment, augmenting crop productivity when it is used as a fertilizer supplement and helping to maintain ecological balance. Thus, vermicompost plays an important role in the circular economy. This article provides an overview of the research activities that have been conducted on the use of vermicomposts to remove pollutants from the soil, in wastewater treatment, and in organic waste recycling throughout the world. Circular economic assessment has revealed that vermicomposting technology is usually feasible except in certain cases. Most other methods of waste disposal lead to soil deterioration, toxic effects, and increased pollution affecting land, air, water, and living beings, in addition to the sometimes considerable expense of their implementation. Thus, an eco‐friendly method that removes waste in one step is needed. Determining the long‐term performance and sustainable operation of vermicomposting systems still poses a challenge, however, as treatment performance is affected by design parameters, operational conditions, and environmental factors. This article summarizes the factors influencing pollutant removal through the vermicomposting process. Finally, this article highlights additional research that should be conducted on these issues to improve the performance of vermicomposting.

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“…The ratio of 5-day biological oxygen demand (BOD 5 ) to chemical oxygen demand (COD), designated as B/C, can be significantly reduced by industrial wastewater to <0.3, indicating a poor biodegradability and causing the paralysis of the biochemical treatment units [20,21]. Due to the shock load and intermittent impacts of PTEs, cyanide and other toxic substances in industrial wastewater, WWTPs might lose efficiencies in removing pollutants to some extent and the effluent quality is affected [21,22], consequently increasing the operation cost [23]. It is therefore necessary to monitor the industrial shock load and improve the resistance of WWTPs to maintain the removal efficiency of refractory pollutants.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Activated Sludge Activities Affected by Industrial Toxins via an Early-Warning System Based on the Relative Oxygen Uptake Rate (ROUR) Index

Chen²,

Zou

et al. 2019

Applied Sciences

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Shock load from industrial wastewater is known to harm the microbial activities of the activated sludge in wastewater treatment plants (WWTPs) and disturb their performance. This study developed a system monitoring the activated sludge activities based on the relative oxygen uptake rate (ROUR) and explored the influential factors with wastewater and the activated sludge samples collected from a typical WWTP in the Taihu Lake of southern Jiangsu province, China. The ROUR was affected by the concentration of toxic substances, mixed liquid suspended solids (MLSS), hydraulic retention time (HRT) and pH. Higher toxin contents significantly decreased the ROUR and the EC50 value of Zn2+, Ni2+, Cr(VI), Cu2+, and Cd2+ was 13.40, 15.54, 97.56, 12.01, and 14.65 mg/L, respectively. The ROUR declined with the increasing HRT and MLSS above 2000 mg/L had buffering capacities for the impacts of toxic substances to some extent. The ROUR remained stable within a broad range pH (6–10), covering most of the operational pH in WWTPs and behaving as an appropriate indicator for monitoring the shock load. A toxicity model assessing and predicting the ROUR was developed and fitted well with experimental data. Coupling the ROUR monitoring system and toxicity model, an online early-warning system was assembled and successfully used for predicting the toxicity of different potential toxic metals. This study provides a new universal toxicity model and an online early-warning system for monitoring the shock load from industrial wastewater, which is useful for improving the performance of WWTPs.

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Enhancing pentachlorophenol degradation by vermicomposting associated bioremediation

Cited by 40 publications

References 30 publications

Effects of two ecological earthworm species on atrazine degradation performance and bacterial community structure in red soil

Effects of two ecological earthworm species on atrazine degradation performance and bacterial community structure in red soil

Vermicomposting: A sustainable tool for environmental equilibria

Monitoring the Activated Sludge Activities Affected by Industrial Toxins via an Early-Warning System Based on the Relative Oxygen Uptake Rate (ROUR) Index

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