产酸相反应器乙醇型发酵的快速启动

针对废水两相厌氧处理系统中产酸相反应器的乙醇型发酵启动速度较慢,污泥易流失的不足,本文采用在产酸相反应器中接种厌氧颗粒污泥,同时控制启动容积负荷、负荷提高幅度、碱度等运行参数,对反应器乙醇型发酵的形成情况进行考察.通过监测液相末端产物、pH、ORP、酸化度等指标来考察反应器的运行情况,结果表明:反应器在34 d内完成由混合酸发酵-丁酸型发酵-乙醇型发酵的演替过程.启动结束时,乙醇+乙酸质量质量浓度之和占液相末端产物总量的75.9%以上;pH值稳定在4.1～4.3;ORP值稳定在-230～-250 mV;接种的厌氧颗粒污泥性质发生明显变化,其表观颜色逐渐由黑色和灰黑色变为土黄色和黄褐色,粒径明显减小,多在0.50～1.25 mm.

Rapid start-up of ethanol-type fermentation with acidogenic reactor

According to the disadvantages of wastewater two-phase anaerobic treatment process as low start-up speed of ethanol-type fermentation with acidogenic reactor and sludge easily to be washed out,the ethanol-type fermentation formation of acidogenic reactor was studied by seeding anaerobic granular sludge,controlling volume loading rate,loading increased range,alkalinity,etc.The running condition of the reactor was monitored by parameters such as terminal liquid products,pH,ORP and acidifying degree etc.Test showed that the succession process from mixed acid fermentation to butyrate-type fermentation reactor to ethanol-type fermentation of reactor was completed within 34 d.At the end of start-up,the mass concentration of ethanol and acetic acid was 75.9 percent of liquid terminal products;pH value was 4.1-4.3;ORP value was-230——250 mV.The sludge properties of seed anaerobic granular sludge changed obviously.Its apparent color changed from black and grey black to khaki and snuff color.The particle size of seed granular sludge became smaller with the range of 0.50-1.25 mm.