外循环厌氧反应器的快速启动

Quick start-up of external circulation (EC) anaerobic reactor

摘要:

工程运行试验研究EC厌氧反应器处理啤酒废水启动过程中的运行效能、稳定性以及内部的污泥分布情况,分析颗粒污泥形成的关键因素.运行第95d,进水有机负荷达到8.5kg/(m3·d),COD去除率达80%,出水COD低于400mg/L;在系统1.2m和4m处污泥中均出现粒径为0.5～1.0mm左右的颗粒污泥.结果表明,EC厌氧反应器处理低质量浓度、大流量的啤酒废水采用间歇-连续快速启动方式是可行的,并且上升流速在2.5～5.0m/h有利于颗粒污泥的快速形成.研究证实EC厌氧反应器处理啤酒废水能够实现稳定、高效地启动运行.

Abstract:

The performance efficiency,stability and inner sludge distribution were investigated in the operation of the full-scale EC reactor for brewing wastewater treatment and the key factor to the formation of anaerobic granular sludge was analyzed,which provides the references for the start-up and operation of EC reactor.After operation for 95 d,the influent organic load and removal efficiency were 8.5 kg/(m3·d) and 80% respectively,and the effluent COD was lower than 400 mg/L.Meantime,the granular sludge with size of 0.5-1.0 mm was observed from the heights of 1.2 and 4 m in the EC reactor.The results demonstrate that EC anaerobic reactor using the intermittent-continuous start-up mode for treating the low COD concentration and high flow of brewing wastewater is feasible and the upflow velocity in range of 2.5-5 m/h is helpful to form granular sludge quickly.The experiment validates that the EC anaerobic reactor can start up stably and efficiently in the brewing wastewater treatment.