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| Effects of organic carbon on the biofilm process for source water pretreatment |
| SHEN Xing-yu1, LIU Ya-lei2, LV Mei-le3, CHEN Dong-zhi2, YANG Guang-feng2 |
1. School of naval architecture and maritime, Zhejiang Ocean University, Zhoushan 316000, China;
2. School of Petrochemical Engineering and Environment, Zhejiang Ocean University, Zhoushan 316000, China;
3. Zhejiang Lishui Ecological Environment Monitoring Center, Lishui 323000, China |
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Abstract In order to explore the operation performance of the biofilm process for source water pretreatment and the response characteristics of the bacterial community to different organic carbon sources, two laboratory-scale source water biofilm pretreatment systems were constructed, using ethanol (reactor R1) and glucose (reactor R2) as organic carbon sources, respectively. Experimental results showed that the NH4+-N removal efficiency (ARE) of reactor R1(88.4%±4.6%) was higher and more stable than that of reactor R2 (84.9%±7.1%). Glucose and ethanol as organic carbon sources increased the CODMnremoval performance, but no significant difference was observed for the CODMn removal. The average CODMn removal efficiencies were 26.3%±15.4% and 26.4±15.9%, respectively. Ethanol as an organic carbon source increased the diversity of bacterial communities in the carrier biofilm, while glucose increased the diversity of bacterial communities in the sediment. Glucose increased the relative abundance of Proteobacteria in the carrier biofilm (72.7%), which was 1.9 times of that in the carrier biofilm with ethanol as the organic carbon source. At the same time, ethanol as the organic carbon source enhanced the enrichment of dominant genera Arcobacter (32.0%) and Tolumonas (15.4 %) in biofilm, and the RA value is much higher than those of other samples.
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Received: 20 February 2023
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