NOVEL TECHNOLOGY FOR TREATMENT OF ACIDIC WASTEWATER CONTAINING MERCURY IN ZINC SMELTER BY BIOLOGICS

摘要

This study focused on acidic wastewater from producing sulfuric acid system in zinc smelter containing mercury 21.48mg/L, zinc 55.85mg/L, lead 38.50mg/L, copper 1.68mg/L, cadmium 10.25mg/L, As 29.86mg/L treated by biologies. The factors of pH value, the ratio of biologies to mercury, complexlng time, hydrolytic time and temperature were studied in this paper. Experimental results indicated that at pH value 10, quantity of biologies to mercury ratio was 16, complexing time 30min, hydrolyzation time 20min, temperature at 40 deg C, concentration of mercury in treated water was removed to 22.15 mu g/L. At same time heavy metals such as Zn, Pb, Cu, Cd, As was removed by biologies, the remained concentration in treated water was Zn 0.53mg/L, Pb 0.12mg/L, Cu 0.01mg/L, Cd low to O.Olmg/L and As 0.023mg/L. According to EDAX analysis, mercury content in complexing sediment reached 28.49 percent easily to recycle as raw material and low concentration of heavy metals in hydrolytic sediment easily to dispose and treat.