阳离子表面活性剂与fecl3 cao联合作用于污泥脱水及机理分析-combined action of cationic surfactant and fecl _ 3 cao on sludge dewatering and mechanism analysis.docxVIP

华 华 中 科 技 大 学 硕 士 学 位 论 文 II II Abstract With the widely-building of wastewater treatment plants, the yield of sewage sludge has a enormous increase correspondingly. The high moisture content and the huge volume are two important factors which has a great influence on the treatment of sewage sludge. As a consequence, the dewatering become the key point to the subsequent disposal. At present, there need some pretreatment on the sewage sludge before the dewatering, such as physical treatment, chemical treament and biological treatment, to improve the dewaterability of the sewage sluge and enhance its effect. This thesis dose research on the effect of cationic surfactants conditioning and the team work of cationic surfactants and FeCl3 as well as cationic surfactants and CaO on the dewaterability of sewage sludge, and also the mechanism of action has been studied. Main contents of this thesis are presented as follows: The screening of cationic surfactants and the effect and the mechanism of cationic surfactants conditioning on the dewaterability of sewage sludge Different cationic surfactants are screened using the index i.e., SRF, moisture content in filter cake, water removal efficiency in the same time. The cationic surfactants are to be selected out to improve the dewaterability. It turns out that the cationic surfactants A and B can improve the dewaterability apparently. The effect of cationic surfactants conditioning on the dewaterability of sewage sludge are investigated through the index which includes SRF, mositure water content in filter cake, water removal efficiency in the same time and the settling ability. According to the turbidity of the filter liquid, the COD content, the protein content, the polysaccharide content as well as the residual quantity of the cationic surfactants in filter liquid along with the analysis of microscopic image of the flocs, this part states the conditioning mechanism of cationic surfactants on the sewage sludge. The effect