中文摘要：

污水处理厂中污泥通常以剩余污泥、初沉污泥以及混合污泥的形式存在。污泥组成不同，污泥的发酵产物不同。为此，考察了温度35℃，pH=10，等挥发性悬浮固体浓度（VSS）条件下这3种污泥的厌氧发酵情况。结果表明：无论是溶出的溶解性化学需氧量（SCOD）还是产总挥发性脂肪酸（TVFA），都是剩余污泥〉混合污泥〉初沉污泥。剩余污泥、混合污泥以及初沉污泥的最佳发酵时间均为8d，第8d各污泥的TVFA的产量分别是529、359、162mgCOD·（gVSS）^-1。无论何种污泥，发酵产生的6种挥发性短链脂肪酸中乙酸的比例总是最大。将剩余污泥和初沉污泥混合后发酵能提升污泥整体的水解和产酸能力。3种污泥发酵过程中氨氮的释放量为剩余污泥〉混合污泥〉初沉污泥，正磷酸盐的释放量为混合污泥〉剩余污泥〉初沉污泥。

英文摘要：

There are mainly three types of sludge in the wastewater treatment plant, i. e. , waste activated sludge （WAS）, primary sludge （PS） and mixed sludge （MS）, for which their composition is different, leading to different products of fermentation. So, in this paper their anaerobic fermentation characteristics was investigated under the condition of 35℃, pH = 10 and the same concentration of VSS （volatile suspend solids）. The results showed that there was a sludge order for both the soluble chemical oxygen demand （SCOD） and total volatile fatty acids （TVFA） produced： WAS 〉 MS 〉 PS. The optimal fermentation time for all type of sludge was 8 d, and producing TVFA 529, 359, 162 mg COD · （g VSS）^-1 respectively for WAS, MS and PS. For any type of sludge, acetic acid is the dominant fermentation product in the six short chain volatile fatty acids. The hydrolysis and acidification of sludge were enhanced when mixing waste activated with primary sludge. The ammonia and phosphorus released By fermentation were WAS〉MS〉PS, MS〉WAS〉PS.