加挂填料种植狐尾藻提升A/O工艺处理猪场沼液的效果  

Treatment effect of piggery biogas slurry by improved A/O process with adding packing and planting myriophylla

作　　者：张泽 孙亚平 钟铭君 崔理华[1] ZHANG Ze;SUN Yaping;ZHONG Mingjun;CUI Lihua(School of Resources and Environment,South China Agricultural University,Guangzhou 510642,China)

机构地区：[1]华南农业大学资源环境学院,广州510642

出　　处：《环境工程学报》2021年第8期2770-2777,共8页Chinese Journal of Environmental Engineering

摘　　要：为提升A/O工艺对猪场沼液中污染物的去除效果,实现高效率且低成本的运行模式,通过对A/O工艺加挂弹性填料种植狐尾藻来优化工艺。结果表明:当进水COD、TN和NH_(4)^(+)-N分别为441~948、401~1 579和369~1 594 mg·L^(-1)时,改良A/O工艺系统出水COD、 TN和NH_(4)^(+)-N去除率分别为42.5%~97.4%、 36.9%~88.3%和94.2%~99.4%,均优于A/O工艺的去除效果且具有显著提升。综合考虑对污染物的去除效果以及企业运行成本,在水力停留时间为10 d时,改良A/O工艺出水水质达到最优,出水COD平均去除率可达75.3%,对NH_(4)^(+)-N平均去除率为96.2%~99.5%,TN的出水质量浓度为70~296 mg·L^(-1)。此外,可结合多级改良A/O工艺和组合工艺进一步优化出水水质。除微生物同化作用以及硝化反硝化途径外,系统中含氮类物质还可通过狐尾藻植物去除。改良A/O工艺中狐尾藻植物能够大量生长,含水量为88.8%~89.0%,TP和TN质量分数分别为3.4~5.2 g·kg^(-1)和51.4~53.8 g·kg^(-1),TN质量分数要远高于普通富营养化水体栽培的狐尾藻,这说明狐尾藻在改良A/O工艺中能够更好的吸收污染水体中的含氮物质。以上结果可为改良A/O工艺对猪场沼液的优化处理提供参考。In order to improve the removal efficiency of pollutants from piggery biogas slurry by traditional A/O system and realize the operation mode of high efficiency and low cost, the process was optimized by adding elastic packing to A/O system and planting myriophylla. The results showed that when the influent COD, TN and NH_(4)^(+)-N were 441~948, 401~1 597 and 369~1 594 mg·L^(-1), the removal rates of COD, TN and NH_(4)^(+)-N were 42.5%~97.4%, 36.9%~88.3% and 94.2%~99.4% respectively, which were better than those of A/O system and had a significant improvement. In addition, the effluent quality can be further optimized by combining multistage improved A/O system and combined system. Considering the removal efficiency of pollutants and the operation cost of the enterprise, the HRT of 10 d was most suitable for the actual operation of the improved A/O system, the average removal rate of COD in the effluent was 75.3%, the average removal rate of 96.2%~99.5%, and the effluent concentration of TN was 70~296 mg·L^(-1). In addition to microbial assimilation and nitrification and denitrification, nitrogen-containing substances in the system could also be removed by myriophylla. In the improved A/O system, myriophylla could grow in large quantities with water content of88.8%~89.0%, TP and TN contents of 3.4~5.2 g·kg^(-1) and 51.4~53.8 g·kg^(-1), respectively, and the concentration of TN was much higher than that of myriophylla in eutrophic water, which showed that myriophylla in the improved A/O system had better absorption performance toward nitrogen in the polluted water. The above results provide a reference for the optimization of piggery biogas slurry treatment by improved A/O system.

关 键 词：猪场沼液 改良A/O工艺 弹性填料 狐尾藻 

分 类 号：X705[环境科学与工程—环境工程]