Citation, 2018, China: On the Biotic Self-purification of Aquatic Ecosystems: Elements of the Theory. Ostroumov S.A. https://www.researchgate.net/publication/200567576; https://5bio5.blogspot.com/2018/06/cita.html ~ CookingFood.Org

Enhanced bioelectroremediation of a complexly contaminated river sediment through stimulating electroactive degraders with methanol supply ;

Article;
Full-text available: https://www.researchgate.net/publication/322923424 ;

Feb 2018;
J HAZARD MATER;

Youkang Zhao

Zhiling Li

Jincai Ma

Hui Yun

Bin Liang

a State Key Laboratory of Urban Water Resource and Environment,

Harbin Institute of Technology, Harbin, 150090, China;

b College of Environment and Resources, Jilin University, Changchun, 130021, China;

c Key Laboratory of Environmental Biotechnology,

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oukang Zhaoa, Zhiling Lia, Jincai Mab, Hui Yunc, Mengyuan Qia, Xiaodan Maa, Hao Wanga,Aijie Wanga,c ,⁎, Bin Liangc,⁎⁎

Harbin Institute of Technology, Harbin, 150090, China;

b College of Environment and Resources, Jilin University, Changchun, 130021, China;

c Key Laboratory of Environmental Biotechnology,


ARTICLE INFO

Keywords:
Bioelectroremediation,Methanol stimulation,Electrical stimulation,Electroactive degraders,
ABSTRACT
Bioelectroremediation is an efficient, sustainable, and environment-friendly remediation technology for the complexly contaminated sediments. Although various recalcitrant pollutants could be degraded in the electrodedistrict, the degradation efficiency was generally confined by the low total organic carbon (TOC) content in thesediment. How to enhance the electroactive degraders’activity and efficiency remain poorly understood. Here we investigated the bioeletroremediation of a complexly contaminated river sediment with low TOC in a cy-lindric sediment microbial fuel cell stimulated by methanol. After 200 days treatment, the degradation effi-ciencies of total petroleum hydrocarbons (TPH), polycyclic aromatic hydrocarbons (PAH), and cycloalkenes(CYE) in the electrode district with methanol stimulation were 1.45–4.38 times higher compared with those inthe non-electrode district without methanol stimulation. The overall electrode district communities were sig-nificantly positively correlated with the variables of the enhanced TPH, PAH, CYE and TOC degradation effi-ciencies (p< .01). The joint electrical and exogenous methanol stimulation selectively enriched electroactive degraders (Geobacter and Desulfobulbus) in the anode biofilms, and their proportion was markedly positivelycorrelated with the characteristic and total pollutants degradation efficiencies (p< .001). This study offers anew insight into the response of key electroactive degraders to the joint stimulation process.

1. Introduction
As an important component of aquatic environment, river sediments accommodate plentiful inorganic/organic matters and microbial communities. Microbial consortium in sediment is an important element for the self-sustaining stability of the entire aquatic ecosystem [1]. Currently, rapid industrialization and urbanization have led to the release of toxic pollutants, such as persistent organic pollutants, pesticides, andemerging pollutants (e.g. antimicrobial agents) into the aquatic environments and mainly accumulated in the aquatic sediments [2–5].The contaminated sediments will further affect the overlying water (o-water) quality for a long time, and even could potentially contaminategroundwater [6]. This is an important secondary pollution source forwater bodies and poses a serious threat to environmental safety andhuman health [7].Unfortunately, the natural self-purification of the contaminatedaquatic environment is a very slow process under both aerobic andanaerobic conditions and needs a long recovery time to its natural state,even though there are no new pollutants discharged into the river [8].The restoration of complexly contaminated sediments is a major socialrequirement to ensure the safety of aquatic ecological environment[9, 10]. Therefore, in order to reduce the pollution levels, improve thewater quality, and protect the water resources [11], it is very urgent todevelop efficient, environment friendly, and sustainable remediationtechnologies for the cleaning up of complexly contaminated sediments.Bioremediation is a potential and economical method comparedwith the physical and chemical remediation processes [12], usuallycommercially applied at large scale. Bioaugmentation with biode-gradative bacteria is one of the bioremediation strategies for the re-mediation of environmental pollutants [13, 14]. However, the coloni-zation and maintenance of the biodegradative bacteria in the complexlycontaminated environments, such as in anoxic sediments, is an im-portant prerequisite for efficient bioremediation [4].In situbiostimu-lation (by supply of a slow-release carbon substrate, low carbon sub-strate or electron acceptor such as nitrate) is another importantbioremediation strategy which has been extensively employed in the

https://doi.org/10.1016/j.jhazmat.2018.01.060
Received 15 November 2017; Received in revised form 30 January 2018;
Accepted 31 January 2018⁎
Corresponding author at: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.⁎⁎
Corresponding author at: Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
E-mail addresses:waj0578@hit.edu.cn(A. Wang),binliang@rcees.ac.cn, liangbin1214@163.com(B. Liang).
Journal of Hazardous Materials 349 (2018) 168–176
Available online 03 February 20180304-3894/ © 2018 Elsevier B.V. All rights reserved.T Enhanced bioelectroremediation of a complexly contaminated river sediment through stimulating electroactive degraders with methanol supply. Available from: https://www.researchgate.net/publication/322923424_Enhanced_bioelectroremediation_of_a_complexly_contaminated_river_sediment_through_stimulating_electroactive_degraders_with_methanol_supply [accessed Jun 13 2018].