A SUCCESSFUL CASE-STUDY OF FINE CHEMICAL-PLANT WASTE-WATER TREATMENT

Assisting the chemical plant to improve its wastewater treatment abili ty was the primary objective of this study. The main products of the c hemical plant were textile chemicals and plastic lubricants. Study ite ms included 1. wastewater quality and quantity investigation, 2. treat ability experiments, 3. process planning and functional design, 4. con struction consulting, 5. start-up assistance and 6. operator training. Three:streams of wastewater in the chemical plant are: 1. rich ammoni a sulfate wastewater, 2. high COD concentration wastewater and 3. low COD concentration wastewater. Some non-biodegradable or inhibitive com pounds were also found in the wastewater. According to experimental re sults, rich ammonia sulfate wastewater could be restored and produce r eusable products by the crystallization process. Moreover, combined lo w COD wastewater and chemical pretreated high COD wastewater could be treated by PAC-flocculation followed by Sequencing Batch Reactor proce ss. The effluent could meet the 1993 Effluent Standards of Taiwan Copy right (C) 1996 IAWQ.