ICSTD反应器对剩余污泥的浓缩消化研究

Treatment of Excess Sludge in Internal Circulation Sludge Thickening and Digestion Reactor

采用新型内循环污泥浓缩消化反应器（ICSTD）对污水处理厂剩余污泥进行浓缩消化处理，系统运行稳定后对反应器内污泥特性进行研究。结果表明：在温度为30～35℃时，污泥产气率最高为1．6m^3／m^3泥；所产沼气的甲烷含量在54％-75％之间；反应器运行期间污泥比阻从513×10^12m／kg降低到202×10^12m／kg，污泥脱水性能逐渐变好；对污泥所含元素进行分析，发现反应器消化效果较好，具有一定的脱氮效能。反应器内污泥优势菌属为鬃毛甲烷菌。

Excess sludge from a WWTP was treated by internal circulation sludge thickening and digestion （ICSTD） reactor. The characteristics of excess sludge in the reactor were investigated. The re- sults showed that at temperature from 30 ℃ to 35 ℃, the maximum gas yield was 1.6 mZ/m3 sludge. The methane in biogas was 54% to 75%. The specific resistance to filtration was reduced from 513 x 1012 m/kg to 202 x 1012 m/kg, and the sludge dewaterability gradually improved. As indicated by the results of elementary analysis, the reactor had a quite good digestion performance and some nitrogen removal a- bility. Methanosaeta was predominant species in the reactor.