Assessment and biological treatment of effluent from textile industry

Abstract

The assessment of effluent generated from international textile industry (Nig) Ltd. Odongunyan Industrial Estate Ikorodu Lagos was carried out. The effluent was analyzed for biochemical oxygen demand (BOD), chemical oxygen demand (COD), total solid (TS), suspended solid (SS), dissolved solid (DS), odour and colour intensity prior to biological treatment with mixed culture of Aspergillus  niger and Aspergillus wentil. The product of biological treatment was analyzed after 5 days of treatment. The result revealed that the effluent was initially of high BOD, COD, TS, DS, SS and colour intensity. The method used in this work has significantly reduced COD to well below 250 mg/l and BOD < 30 mg/l, TSS < 30 mg/l which are the upper limit for disposal into surface water. The result indicates remarkable overall COD reduction from 800 mg/l to 200 mg/l (75%), BOD (97.3%) from 750 mg/l to 20 mg/l and bioremediation of TSS < 30 mg/l (99.5%), DS (99.6%) and SS (99.3%).

Key words: Textile industrial effluent, Aspergillus niger, Aspergillus wentil.