法国某生活污水厂污泥好氧消化工艺运行研究

为了提高出水质量，法国小镇Cagnes—sur—Mer的生活污水处理厂从2008年初开始实施高有机负荷的运行，但同时这也提高了出泥产量。由于污泥的处理费用及搬运污泥的交通费用很高，水厂对污泥进行了污泥好氧稳定工艺，工艺使用纯氧机（VSA装置）就地利用空气制氧。工艺投入运行后，每日对好氧消化池的入泥和出泥进行采样和检测（MLSS、MLVSS、pH、COD、DRYNESS etc）以建立完整的运行数据。污泥经好氧消化作用后其有机物含量减少60％以上，每月减少40吨的出泥。同时，消化池的使用还使水厂周日也能对曝气池中的污泥进行抽取，缓解了以往由于周日停止排泥而导致周一曝气池中污泥浓度过大的问题。从而达到优化出水水质的目的。消化池中的温度维持在40℃左右，因为反应为放热反应，所以无需加热设备。此项目所收集到的数据将为这种工艺的发展提供帮助。同时也可以为那些想要减少出泥量的水厂提供一种新的方法。因为它投资小，见效快，操作简单。

Study on Aerobic Digestion of Sludge in a Sewage Treatment Plant in France

Since early 2008, the Cagnes-sur-Mer water treatment plant has been operated with high loading rate to improve the effluent quality. While this operation increased the effluent sludge quantity correspondingly increased the costs of sludge disposal and transportation. Therefore the sludge was stabled adopting aerobic process using pure oxygen made in site. The influent and effluent sludge of the aerobic digester were sampled and test daily for testing items of MLSS, MLVSS, pH, COD, dryness and so on. The results showed that by aerobic digestion, the organic materials of the sludge reduced by more than 60%. It means 40 tons of sludge was reduced per month. Furthermore, the sludge of the digester could be pumped out even in Sunday due to the operation of the digester. So it alleviated the problems of over high concentration of sludge in the aeration tank on Monday due to no discharging sludge on Sunday. Thereby the effluent water quality was improved. The digester temperature was maintained at about 40℃ without any heating device due to the exothermie reaction within the digester. The data collected by this project are helpful for development of this process. And it provides a novel method for the sewage treatment plants who want to reduce the sludge. Because it has advantages of low cost, getting quick returns and simple operation