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Abstract

Abstract
This paper focuses on the effect of laboratory chemicals on the efficiency of the biological treatment of wastewater for effluents mixed with laboratory waste and other unmixed with it, Two bench scale batch reactor were used .The first reactor feeded with effluents without chemicals , the second reactor feeded with effluents mixed with chemicals, in order to compare the removal rate of (COD) and the growth of (MLVSS) according to concentration of (MLVSS) (1000,1300, 2000,2500) mg/l at fixed value of (COD)for three hospital(Ibn seena,Ibn alatheer,Alkhansaa) .The result showed that the highest value of removal achieved at (F/M=0.16) and (MLVSS=2500) that in depended at the first of reaction ,also showed that the inhibition effects because of laboratory Chemicals appears through inhibition in the removal of (COD) and growth of (MLVSS).The removal efficiency was about (93-96)%for the first reactor and about (85-90)% for the second reactor .Its also showed that its very necessary follow regular ways in order to reduce its effect on the biological treatment unit. keywords:(biological treatment of wastewater, biological treatment of hospital wastewater)