The effect of redox capacity of humic acids on hexachlorobenzene dechlorination during the anaerobic digestion process
Hexachlorobenzene (HCB) dechlorination affected by humic acids (HA) was evaluated in terms of HA redox capacity, HA concentrations, and microbial community, as well as the correlation between HA redox capacity values and HCB concentrations. With addition of HA in the initial stage, redox capacity values increased by 2.19 meq/L (80 mg/L of HA addition, HA80), 2.51 meq/L (120 mg/L of HA addition, HA120), and 3.64 meq/L (200 mg/L of HA addition, HA200), respectively. The addition of HA could prominently enhance the HCB degradation rate. However, the concentration and the redox capacity of HA decreased during the anaerobic digestion process. Illumina MiSeq sequencing showed that microbial community affected by HA. Bacillus, Comamonas, and Pseudomonas were the predominant genera during the HCB dechlorination treatment. Moreover, Bacillus and Pseudomonas can improve HA electron transfer capability and promote the dechlorination of HCB.
KeywordsHexachlorobenzene Dechlorination Humic acids Redox capacity Microbial community
This work was financially supported by the National Natural Science Foundation of China (No. 51608499).
- Amato KR, Yeoman CJ, Kent A, Righini N, Carbonero F, Estrada A, Gaskins HR, Stumpf RM, Yildirim S, Torralba M, Gillis M, Wilson BA, Nelson KE, White BA, Leigh SR (2013) Habitat degradation impacts black howler monkey (Alouatta pigra) gastrointestinal microbiomes. ISME J 7(1344):1–10Google Scholar
- Azman S, Khadem AF, Plugge CM, Stams AJM, Bec S, Zeeman G (2017) Effect of humic acid on anaerobic digestion of cellulose and xylan in completely stirred tank reactors: inhibitory effect, mitigation of the inhibition and the dynamics of the microbial communities. Appl Microbiol Biotechnol 101:889–901CrossRefGoogle Scholar
- Chai XL, Liu GX, Zhao X, Hao YX, Zhao YC (2012) Fluorescence excitation–emission matrix combined with regional integration analysis to characterize the composition and transformation of humic and fulvic acids from landfill at different stabilization stages. Waste Manag 32(3):438–447CrossRefGoogle Scholar
- Chen IM, Chang YF, Lin H (2004) Microbial Dechlorination of hexachlorobenzene by untamed sediment microorganisms in Taiwan. Practice periodical of hazardous, toxic, and radioactive. Waste Manag 8(2):73–78Google Scholar
- Li DY, Yang TX, Wu MH, Xi BD, Wu JQ, Li GW, Li CL (2016) Anaerobic degradation regulation of hexachlorobenzene and degradation products enhanced by humic acid [J]. Res Environ Sci 29(6):870–876 (In Chinese)Google Scholar