The result showed that the removal rate of COD from effluent would be up to 98%, and water reuse rate 88%, was and also recover a lot of iron resources.
STUDY ON TREATMENT AND REUSE OF WASTE WATER FROM ACTIVATED CARBON PRODUCTION BY ZINC CHLORIDE METHOD——Ⅱ. Chemical Recovery of Sludge and Recycling Utilization of Treated Effluent
Water intake decreases from 90~110m3/t to 1.6 m3/t after implementing zero effluent discharge,and it also saves 0.12 ton waste paper raw material when making one ton product,which evidently decreases the manufacture cost.
Tannery wastewater is a kind of mixed wastewater which contains many kinds of pollutant. After chrome in waste-water is recovered with alkali precipitation, the results are as followings: CODcr>2000mg/L, BOD5 > l000mg/L, S-2> 0- l00mg/L. Treated with the process of flotationoxidation ditch, the remove rate of CODcr, BOD5 and S"2 is more than 90%, 95% and 98% respectively. After the treated effluent is deeply treated with the centralized technology of coagulation-settlement-filtration, the water quality can ...
Vacuum belt filter for separating solid and liquid in coal-ash water has been recemmended. After treatment, the suspended substance in wastew'ater could reach less than 100 mg/L, and the water could be recycled, and the separated ash could be utilized after further treatment. It could be used as material for making glass beads etc.