污水土地好氧生物过滤处理系统的小试研究

TEST RESEARCH ON BIOLOGICAL AERATED FILTRATION WASTEWATER LAND TREATMENT SYSTEM

在流量60 L.d-1、曝气量0.48 L.min-1的条件下,以碎石为填料,研究了容积负荷和运行方式(升流式和降流式)对污水土地好氧生物过滤处理系统去除人工生活污水中COD和NH4+-N效果的影响。试验结果表明,污水土地好氧生物过滤处理系统可同时去除有机物和NH4+-N,升流式和降流式污水土地好氧生物过滤处理系统对COD的去除效果差异不大,均在COD容积负荷为0.089 kg.m-3.d-1时去除效果最佳,去除率分别为96%和97%;污水土地好氧生物过滤处理系统对NH4+-N的去除效果随着容积负荷的逐渐升高而下降,且降流式对NH4+-N的去除率比升流式高出11.1%～28.3%。以罗丹明B作为脉冲示踪剂进行流态试验,结果表明升流式和降流式污水土地好氧生物过滤处理系统均为完全混合式反应器。

In the flow of 60 L.d-1 and the aeration rate of 0.48 L.min-1, with gravel as the media, the effect of COD volume load and feeding mode （up-flow and down-flow） on COD and NH4＋-N removal in syathetic wastewater was studied, treated by biological aerated filtration wastewater land treatment system. The results showed that： organics and NH4＋-N can be both removed in the system at the same time ,and the highest COD removal efficiency, 96% and 97% separately, was achieved when the COD volume load was in 0.089 kg .m-3 .d-1, treated by the up-flow and down-flow biological aerated filtration wastewater land treatment systems,and the differences between them were negative; the removal efficiency of NH4＋-N decreased with the COD volume load increasing by the biological aerated filtration wastewater land treatment system, and down-flow system was higher than the up-flow about 11.1%-28.3%. The flowing pattern test, with rhodamine B as a pulse tracer, showed that both the up-flow and down-flow land treatment systems are completely mixed reactor.