甲醛对煤化工废水生化处理系统的冲击及快速修复技术研究

THE IMPACT OF FORMALDEHYDE ON THE COAL CHEMICAL INDUSTRY WASTEWATER BIOCHEMICAL TREATMENT SYSTEM AND ITS FAST REPAIR TECHNOLOGY

为了考察煤化工废水生化处理系统对甲醛的耐受性及系统受冲击后的快速修复情况,本研究采用不同甲醛浓度的废水对其进行了冲击试验。研究结果表明:在系统受冲击后,通过检测系统各部分p H和DO的变化,可以快速准确地判断系统受冲击的状态。当进水甲醛浓度低于100 mg/L时,系统运行正常。当进水甲醛浓度为173.5 mg/L时,系统在受持续冲击57 h后趋于崩溃。在生化系统趋于崩溃的情况下,只靠系统自然恢复能力,3 d之内出水无法达到排放标准要求。通过向生化系统投加活性污泥调理剂,可使其处理效能在在24 h内得到修复,实现出水达标排放。

In order to study the tolerance of coal chemical industry wastewater biochemical treatment system to formaldehyde and the rapid repair capacity after impact,we used different concentration of formaldehyde wastewater to impact coal chemical industry wastewater biochemical treatment system. The results showed that after the impact,pH and DO in each part of the system were changed,by which researchers could fast accurately judge whether the system was impacted by them. When the concentration of inlet formaldehyde was below 100 mg / L, the biochemical treatment system ran normally. When the concentration of inlet formaldehyde was 173. 5 mg / L,the effluent quality of the system was seriously deteriorated after 57 hours impact which suggested the biochemical system tended to collapse. Under the condition of the biochemical system tended to collapse,the effluent of biochemical system couldn＇ t meet the discharge standard requirements relying on system natural resilience in three days. By adding the active sludge conditioner,the biochemical system could rapid repair within 24 hours.