Abstract:

To address the requirements and characteristics of low-temperature(≤4℃) and anaerobic domestic sewage treatment in Qinghai-Tibet Plateau,the mechanism of advanced treatment of enhanced flocculation and catalytic electrochemical oxidation of cold domestic sewage in the Plateau was studied.The best combination unit including enhanced flocculation and catalytic electrochemical oxidation for treatment of cold domestic sewage was presented.The result of advanced treatment showed that the removal rate of COD was over 50% at polyaluminium chloride (PAC) dosage of 50 mg•L^-1 and then polyacrylamide (PAM) dosage of 0.5 mg•L^-1 in enhanced flocculation according to the dosage sequence.At the reaction voltage of 10 V, the removal rates of COD and NH₃-N were 95% and 80% respectively after the reaction time of 120 min by enhanced physico-chemical treatment technology of synergistic action of electric field and catalytic activated filler.The combination unit of enhanced coagulation and catalytic electrochemical techniques enabled cold domestic sewage from the Tuotuohe railway station to reach second-grade standards of surface water quality.

摘要：

针对青藏铁路沿线列车站段生活污水在低温（≤4℃）、缺氧条件下的处理要求及特点，研究了强化混凝、催化电氧化技术深度处理高原地区低温生活污水的机理，提出了青藏高原地区低温生活污水处理的最佳工艺组合。深度处理的研究结果表明：采用强化混凝处理技术即在投加无机絮凝剂PAC 50 mg•L^-1后，再投加有机絮凝剂PAM 0.5 mg•L^-1，可对COD一次性去除50%以上，之后再施以催化电氧化技术，通过电场与催化活性填料协同作用，低温生活污水的COD一次性去除率可达95%，NH₃-N去除率80%左右;经此组合工艺处理，可使低温生活污水达到地面水源水质二级标准。