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.