Investigation on reducing environmental
impacts of waste water
from coal washery plant
Abstract
About 700000 m3 of waste water is produced from Zirab coal
washery plant every year. This black water not only carries about
4000 tons fine coals, it also contains waste water pollution. In this
investigation by flocculation studies under optimized conditions
(like concentration of flocculant, 0.0015 g/t, pH=8, concentration of
silicate 0.01 g/t as depressant, and r.p.m. of 150) has been shown
that it is possible to separate solid particles from black water with
recovery of 93% with ash removal of40% at the same time. So, the
water produced can be recycled to the washery plant with improved
quality.
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