温度对改进型EGSB处理城镇污水的影响

Effect of Temperature on Municipal Wastewater Treatment in Modified Expanded Granular Sludge Bed

摘要:

利用配水使用改进型厌氧膨胀颗粒污泥床（EGSB）反应器研究了温度对处理城镇污水效果的影响.结果表明：改进型EGSB反应器在低温时（7~13 ℃）能正常启动，启动后反应器中pH值保持在6.2~7.6之间，略高于高温（大于25 ℃）阶段的6.0~7.4之间;在高温下反应器的启动比在低温时有更好的化学需氧量(COD)去除效果，启动时间也更短;低温启动后反应器出水的碱度为400 mg·L-1、挥发性脂肪酸(VFA)值为120 mg·L-1高温时出水的碱度为600 mg·L-1、挥发性脂肪酸(VFA)值为180 m

Abstract:

A study was made of the effect of temperature on municipal wastewater treament in modified expanded granular sludge bed (EGSB).The result shows that the pH of water in the reactor remains to be 6.2~7.6 after stability at lower temperature（7~13 ℃）,and 6.0~7.4 at higher temperature（>25 ℃） during starting up.The reactor is easier to start up at higher temperature with higher chemical oxygen demand (COD) removal efficiency.The alkalinity of water in the reactor is 400 mg·L-1 during the period of lower temperature,and 600 mg·L-1 in the period of higher temperature.The concentrations of volatile fatty acid（VFA） of outlet (180 mg·L-1) are greater at higher temperature than those at lower temperature(120 mg·L-1).The COD removal efficiency increases from 63.7% to 87.0%with the increasing of temperture in the reactor from an average temperature less than 15 ℃ to 25 ℃ or above.A negative relation is found between the oxidative redox potential (ORP) and the removal efficiency of COD in the reactor.ORP changes from -410 mV to -520 mV when the temperature varies from 7 to 29 ℃.