Effect of effluent recirculation rate on the performance of anaerobic bio-filter treating coal gasification wastewater under co-digestion conditions. Issue 91 (15th September 2016)

• Record Type: Journal Article
• Authors: Li, Yajie; Tabassum, Salma; Yu, Zhenjiang; Wu, Xiaogang; Zhang, Xiaojun; Song, Yaping; Chu, Chunfeng; Zhang, Zhenjia
• Is Part Of: RSC advances. Volume 6:Issue 91(2016)
• Page Start: 87926
• Page End: 87934
• Publication Date: 2016-09-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra18363h
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : In this study, anaerobic biofilter (AF) was adopted for anaerobic co-digestion of potato starch wastewater (PSW) and coal gasification wastewater (CGW). Abstract : In this paper, anaerobic biofilters (AF) were adopted for anaerobic co-digestion of potato starch wastewater (PSW) and coal gasification wastewater (CGW). A modified Gompertz equation was used for the analysis. With a ratio of PSW : CGW at 1 : 1 for the influent, it remarkably improved the removal effect of (chemical oxygen demand) COD and total phenol. With an influent concentration of COD of 2600 mg L −1 and total phenol 200 mg L −1, the effluent COD and total phenol could be decreased to 1100 mg L −1 and 100 mg L −1, respectively. The methane production rate was generally above 260 (mL CH4 per g per d). In order to further enhance the performance of the system, the strategy of effluent recirculation on co-digestion was adopted. The result indicated that under a low effluent recirculation rate of 0.5, concentrations of COD and total phenol in effluent could reach as low as 800 and 70 mg L −1, respectively. Also, the methane production rate was around 300 (mL CH4 per g per d). High-throughput sequencing showed the microbial phyla Bacteroidetes, Chloroflexi, Euryarchaeota, Firmicutes dominanted the system and the abundance variation was observed at different effluent recirculation rates.