Simultaneous removal of carbon and nitrogen from municipal-type synthetic wastewater using net-like rotating biological contactor (NRBC) |
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Authors: | Zhiqiang Chen Qinxue Wen Jianlong Wang Fang Li |
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Affiliation: | aSchool of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China bDepartment of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China |
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Abstract: | The treatment of municipal-type synthetic wastewater was carried out using a three stages net-like rotating biological contactor (NRBC). The results indicated that, compared with conventional rotating biological contactor (RBC), NRBC have several advantages, such as quick start-up, high biomass concentration and can handle high organic loading rates. The COD and total nitrogen removal rates achieved were 78.8–89.7% and 40.2–61.4%, respectively, in aerobic treatment of low COD municipal-type wastewater at hydraulic retention times (HRT) from 5 to 9 h. The COD removal rate achieved 80–95% when organic loading varied between 16 and 40 gCOD/m2 d. A large amount of nematodes were found in the NRBC system, which made the NRBC system produce relatively low amounts of waste sludge, due to their grazing. |
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Keywords: | Net-like rotating biological contactor (NRBC) Municipal-type synthetic wastewater Organic loading Carbon removal Nitrogen removal |
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