硅藻原土处理城镇污水试验研究

Continuous-flow Test for Treatment of Municipal Wastewater Using Raw Diatomaceous Earth

采用硅藻原土代替硅藻精土作为微生物载体处理城镇污水具有较好的处理效果。连续流试验结果表明,当进水流量为4L/h时,出水COD、总氮、氨氮及总磷浓度平均值分别为27、11.1、0.7、1.2mg/L,系统具有较强的抗冲击负荷能力。当进水流量为4L/h时,硝化和反硝化反应能充分进行,故回流比和溶解氧的变化对处理效果的影响都较小。

The feasibility of using raw diatomaceous earth （DE） instead of refined DE as microbial carrier to treat municipal wastewater was investigated. The results of continuous-flow test show that the effluent concentrations of COD, TN, NH3 - N and TP are 27 mg/L, 11.1 mg/L, 0.7 mg/L and 1.2 mg/L respectively when the influent flow rate is 4 L/h. The system has a strong ability in resisting shock loading. When the influent flow rate is 4 L/h, the nitrification and denitrification reaction is complete, thus the change of dissolved oxygen value and reflux ratio has less effect on the removal efficiency.