厌氧生化技术在己内酰胺废水处理中的应用

Anaerobic biochemistry treatment for caprolactam sewage

根据己内酰胺装置废水的特点 ,选用了厌氧生化处理技术对其中有机废水进行预处理。讨论了温度、pH值、营养盐、微量元素等外在因素及硫酸盐、氨氮浓度、有机物组成成分等内在因素对系统的影响及其对策。提出了最佳运行条件 :负荷 4.5～ 5 .0kgCOD/(m3·d) ,波动小于 15 % ,进水温度约 33℃ ,进水 pH值为 5～ 6,温度 35～ 38℃ ,pH值为 7.5～ 8.5 ,挥发性脂肪酸小于 12mmol/L ,硫酸盐浓度不大于 5 0 0mg/L。处理后己内酰胺废水COD值由原 15 0 0 0mg/L降低至 1977mg/L。

According to the feature of waste water from caprolactam production, anaerobic biochemistry treatment was adopted to pretreat organic sewage. The technological process was as follows: load 4.5～5.0 kg COD/m 3·d, fluctation less than 15%, influent temperature about 33℃ and pH value 5～6, temperature 35～38℃, pH value 7.5～8.5, volatile fatty acid content less than 12 mmol/L, SO 2- 4 concentration not more than 500 mg/L. After treatment, COD value of caprolactam sewage decreased from 15 000 mg/L to 1 977 mg/L.