spsilon-caprolactam-degradation by alcaligenes faecalis for bioremediation of wastewater of a nylon-6 production plant

摘要

Alcaligenes faecalis G utilized 95-97% of 5-15 g epsilon-caprolactam l~(-1) in 24-48h over a pH range of 6-8.5 and at 23-40degC,without complex nutrient requirement.In the absence of KH_2PO_4 and K_2HPO_4/MgSO_4 in the medium,only 7.6% and 0.2% of 10g caprolactam l~(-1) was utilized,respectively.The chemical oxygen demand (COD) of the watewater of nylon-6 plant was mainly due to its caprolactam content.A.faecalis G decreased the caprolactam content and COD of the wastewater by 80-90% of the original in spite of the wastewater having higher caprolactam content (3600 mg l~(-1))and COD(7700 mg l~(-1)) than those of any of the previous reports.