期刊
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
卷 213, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2021.112054
关键词
Arsenic sorption; Arsenite oxidation; Arsenate reduction; Arsenic sequestration; Bioprecipitation
资金
- Team Tech programme of Foundation for Polish Science as a part of Measure 4.4 of the 2014-2020 Smart Growth Operational Programme, EU [POIR.04.04-00-00-2053/16 (TEAM TECH 2016-2/9)]
The study revealed the resistance of key bacterial groups in SMC to arsenic, as well as the microbial community's ability to oxidize As(III) and reduce As(V). It also showed the cooperation between arsenate and sulfate-reducing bacteria in the precipitation of AsxSy.
Spent mushroom compost (SMC) is a lignocellulose-rich waste material commonly used in the passive treatment of heavy metal-contaminated environments. In this study, we investigated the bioremediation potential of SMC against an inorganic form of arsenic, examining the individual abiotic and biotic transformations carried out by SMC. We demonstrated, that key SMC physiological groups of bacteria (denitrifying, cellulolytic, sulfate reducing, and heterotrophic) are resistant to arsenites and arsenates, while the microbial community in SMC is also able to oxidize As(III) and reduce As(V) in respiratory metabolisms, although the SMC did not contain any As. We showed, that cooperation between arsenate and sulfate-reducing bacteria led to the precipitation of AsxSy. We also found evidence of the significant role organic acids may play in arsenic complexation, and we demonstrated the occurrence of As-binding proteins in the SMC. Furthermore, we confirmed, that biofilm produced by the microbial community in SMC was able to trap As(V) ions. We postulated, that the above-mentioned transformations are responsible for the sorption efficiency of As(V) (up to 25%) and As(III) (up to 16%), as well as the excellent buffering properties of SMC observed in the sorption experiments.
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