进水有机负荷对三级生物滴滤池脱氮除磷的影响

试验采用三级(好氧/兼氧/好氧)多层组合填料生物滴滤池处理模拟生活污水,探索强化脱氮除磷工艺。考察了在相同水力负荷和布水周期下,改变进水有机负荷对COD、NH_4~+-N、TN和TP去除率的影响,并用扫描电镜和X射线衍射(XRD)对填料进行辅助分析。研究结果表明,三级串联生物滴滤池的组合相比传统的单级或两级生物滴滤池反应器处理效果更好。第1级和第2级生物滴滤池去除COD、NH_4~+-N和TN效果较好,贡献率合计分别为93.0%、91.2%和91.4%。第1级和第3级生物滴滤池除磷效果较好,贡献率合计91.4%。有机负荷为0.328~0.392 kg/(m~3·d)时,系统总体去除效果最好。

EFFECTS OF INFLUENT ORGANIC LOADING ON REMOVAL OF NITROGEN AND PHOSPHORUS FROM THE THREE STAGE BIO-TRICKLING FILTERS

In this study,the three stage (aerobic/facultative/aerobic) multilayer combined bio-trickling filters were used to treat nitrogen and phosphorus in domestic wastewater.The effects of changing the influent organic loading on the removal rate of COD,NH4+-N,TN and TP were investigated under the condition of the same hydraulic load and water cycle,the filters were also analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD).The results showed that compared with the traditional single stage or two stage bio-trickling filter reactor,the treatment effect of the cascade bio-trickling filters with the three stages was significantly improved.The removal efficiency of COD,NH4+-N and TN in the first and second stages of bio-trickling filter was better,and the total contribution rates were 93.0％,91.2％ and 91.4％,respectively.The first and third stage bio-trickling filter had higher phosphorus removal efficiency and total contribution rate was 91.4％.The optimum organic load was 0.328 ～ 0.392 kg/(m3 · d).