ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

With the rapid development of the sewage treatment, dewatered sludge, as an inevitable byproduct, is increasing its amount. Anaerobic digestion performance of dewatered sludge flocculated by polyacrylamide under different biopretreatments conditions were studied. The feeding concentration was 3% of total solid, and the digestion temperature was 35℃. The cumulative biogas yield, methane content, pH value, ammonia nitrogen content and total chemical oxygen demand (TCOD) were analyzed to explore the effect of fungus—Paecilomyces variotii on anaerobic digestion process. The result showed that biopretreatment of dewatered sludge prior to anaerobic digestion was an alternative method. Direct addition and 2 d biopretreatments can both enhance cumulative biogas yield and methane content with faster hydrolysis rate and better organic matter degradation rate. Compared with the pure sludge treatment, direct addition of Paecilomyces variotii was optimal, and its cumulative biogas production and methane production were increased by 85.79% and 42.76%, respectively. While 1 kg dewatered sludge can produce 12.69 L methane with an increase of 42.74% of sludge without pretreatment. The result would provide theoretical basis for solving the problem of dewatered sludge resourceful treatment.