Abstract:

In order to realize the biochemical tail water of pig wastewater resource utilization, this study took the A²O process effluent from the sewage treatment station of a pig enterprise in Jingzhou City as the sample. After coagulation pretreatment, the effluent entered the biofilter aerated with magnetic ceramics and ordinary ceramics as the fillers, respectively, to explore the pollutant removal effect of the device under the action of magnetic field, as well as the influence of magnetic field on the specific aerobic rate and nitrification rate of microorganisms. The experimental results showed that the mechanical properties of magnetic ceramic particles prepared under the conditions of m (sludge): m (kaolin): m (magnetic powder)=3∶1∶4, preheating temperature of 300 ℃, and calcination temperature of 1 000 ℃ were the best. Under the same conditions, the magnetic field could shorten the start-up time of biofilter by increasing the specific oxygen consumption rate and nitrification rate of microorganisms, and the removal effect of pollutants in the stable stage was better than that of ordinary biofilter. When the magnetization of the ceramides was 2.8 mT, HRT was 8 h, and DO was 4-5 mg/L, the system worked best. The removal rates of COD and NH₄ ⁺-N were 76.1% and 93.8%, respectively. The dissolved microbial by-products and the ferritic acid-like substances in the effluent almost disappeared, and only a small amount of humic acids with complex molecular structure and stable chemical properties remained, which met the class Ⅰ standard in Integrated Wastewater Discharge Standard (GB 8978-1996).

Key words: biochemical tail water of pig wastewater, magnetic ceramics, nitrification rate, specific oxygen uptake rate

摘要：

为实现养猪废水生化尾水资源化，取荆州市某养猪企业污水处理站A²O工艺出水，将其混凝预处理后分别送入以磁性陶粒、普通陶粒为填料构建的曝气生物滤池，探究磁场作用下装置去除污染物的效果以及磁场对微生物比耗氧速率、硝化速率的影响。实验结果表明，在m（污泥）∶m（高岭土）∶m（磁粉）=3∶1∶4，预热温度为300 ℃，焙烧温度为1 000 ℃条件下制备所得的磁性陶粒的机械性能最好；在相同条件下，磁场通过提高微生物比耗氧速率、硝化速率使得曝气生物滤池启动挂膜时间更短，且稳定阶段对污染物去除效果较普通曝气生物滤池更优；当陶粒充磁为2.8 mT，HRT为8 h，DO为4~5 mg/L时，系统运行最佳，对COD、NH₄ ⁺-N的去除率可分别达76.1%、93.8%，出水中溶解性微生物副产物与类富里酸物质几乎消失，仅存少量分子结构复杂、化学性质较稳定的腐殖酸类物质，满足《污水综合排放标准》（GB 8978—1996）中一级标准。

关键词: 养猪废水生化尾水, 磁性陶粒, 硝化速率, 比耗氧速率

CLC Number: 

• X713