Chen Yanlin, Sui Qianwen, Yu Dawei, Zheng Libing, Chen Meixue, Ritigala Tharindu, Wei Yuansong
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Laboratory of Water Pollution Control Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Membranes (Basel). 2021 Jan 23;11(2):83. doi: 10.3390/membranes11020083.
A high concentration of suspended solids (SS) in swine wastewater reduces the efficiency of the biological treatment process. The current study developed a short-cut combined magnetic coagulation (MC)-sequence batch membrane bioreactor (SMBR) process to treat swine wastewater. Compared with the single SMBR process, the combined process successfully achieved similarly high removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), ammonium nitrogen (NH4+-N), and total phosphorous (TP) of 96.0%, 97.6%, 99.0%, and 69.1%, respectively, at dosages of 0.5 g/L of poly aluminium chloride (PAC), 2 mg/L of polyacrylamide (PAM), and 1 g/L of magnetic seeds in Stage II, and concentrations of TN, COD, and NH4+-N in effluent can meet the discharge standards for pollutants for livestock and poultry breeding (GB18596-2001, China). The nitrogen removal loading (NRL) was increased from 0.21 to 0.28 kg/(m·d), and the hydraulic retention time (HRT) was shortened from 5.0 days to 4.3 days. High-throughput sequencing analysis was carried out to investigate microbial community evolution, and the results showed that the relative abundance of ammonia-oxidizing bacteria (AOB) in the SMBR increased from 0.1% without pre-treatment to 1.78% with the pre-treatment of MC.
猪废水中高浓度的悬浮固体（SS）会降低生物处理过程的效率。当前研究开发了一种捷径组合磁混凝（MC）-序批式膜生物反应器（SMBR）工艺来处理猪废水。与单一的SMBR工艺相比，该组合工艺在第二阶段投加0.5 g/L聚合氯化铝（PAC）、2 mg/L聚丙烯酰胺（PAM）和1 g/L磁种的情况下，成功实现了对化学需氧量（COD）、总氮（TN）、氨氮（NH4+-N）和总磷（TP）同样高的去除效率，分别为96.0%、97.6%、99.0%和69.1%，且出水的TN、COD和NH4+-N浓度可达到畜禽养殖污染物排放标准（GB18596-2001，中国）。脱氮负荷（NRL）从0.21增加到0.28 kg/(m·d)，水力停留时间（HRT）从5.0天缩短至4.3天。进行了高通量测序分析以研究微生物群落演变，结果表明，经过MC预处理后，SMBR中氨氧化细菌（AOB）的相对丰度从预处理前的0.1%增加到了1.78%。
