| In this paper, in consideration of the character of the wastewater of Zhejiang Chemical Co., Ltd., we use iron-carbon micro-electrolysis and electrocatalysis process to pre-treatment the wastewater. It can help improve the biodegradability of wastewater, then followed by hydrolytic-acidification, anaerobic,aerobic, treatment process, to achieve the effective impact.The optimal process condition of iron-carbon micro-electrolysis pretreatment was reaction time 4h, the concentration of iron filings 25g/L, pH 4, Fe/C (mass ratio) 7:1. Inflow CODCr was 154692mg/L, and the CODCr removal rate could up to 30 percent, chroma removal rate could expand 60 percent. At the same time, this paper discussed the influence factors of electrocatalysis pre-treatment. The optimal process condition was pH 10.06 of raw wastewater, voltage 30V, current density 0.0575A/cm2, electrolytic time 10min, electrode distance 4cm. Inflow CODCr was 154692mg/L, and the CODCr removal rate could up to 70 percent.During the iron-carbon micro-electrolysis-hydrolytic-acidification-anaerobic treatment series process, the inflow CODCr was about 14000mg/L and the effluent CODCr was about 2100mg/L, under the condition of 6h hydrolytic-acidification and 24h anaerobic treatment. The total CODCr removal rate of biological treatment could up to about 80%. During the electrocatalysis– hydrolytic - acidification, anaerobic- aerobic series process. The inflow CODCr was about 20000mg/L and the effluent CODCr was about 2000mg/L. The total CODCr removal rate of biological treatment could up to about 90%.After the electrocatalysis-hydrolytic-acidification, anaerobic-aerobic series process, ammonia-nitrogen of effluent was about 2000mg/L. We use chemical precipitation to remove ammonia-nitrogen. The optimal process condition was pH 10, reaction 10min, molar ratio of magnesium and nitrogen 1.1:1, molar ratio of phosphorus and nitrogen 1.1:1, and the nitrogen removal rate could up to 90%.
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