基于水热反应对城市污泥脱水性能的芬顿氧化研究

Study on the Performance of Municipal Sludge Under Hydrothermal Condition and Fenton Reaction

以台州市江口污水处理厂的脱水污泥为研究对象,通过分析水热反应后污泥的离心干基含水率m(H2O)/m(DS)和上清液中的COD、TN、TP等变化来探究影响情况。结果表明水热反应可促进污泥的降解,当反应温度120℃,初始pH值3时,随着反应时间从0到30 min,污泥的离心干基含水率从1.7提高到4.79,上清液中的COD值从230 mg/L升高到1332 mg/L,当芬顿试剂投加量3 g/L时,上清液中的TN为315 mg/L,TP为16.03 mg/L,COD增加至4232.5 mg/L,污泥的离心干基含水率达到7.8。结果表明,在水热条件下投加一定量的芬顿试剂能极大地改善污泥的脱水性能,上清液中丰富的N、P可作农业灌溉或进一步采用生物法处理排放,稳固化后的污泥也可作土地利用、建材原料等,该技术为污泥后续减量化、无害化、资源化的处理具有一定的指导意义。

In this paper, the dewatering sludge was taken from Taizhou Jiangkou Sewage Treatment Plant. And the dry base moisture content m(H2 O)/m(DS) of sludge,COD,TN and TP concentrations after hydrothermal reaction were all investigated for futher research. Results show that the hydrothermal reaction can promote the degradation of the sludge for dry basis moisture content of sludge increasing from 1.7 to 4.79 and the COD of supernatant fluid from 230 to 1332 mg/L under the condition of 120 ℃,pH 3 and reaction time 0 ~ 30 min. When the addition of Fenton reagent reaches 3 g/L, TN,TP and COD increase separately to 315 mg/L,16.03 mg/L and 4232.5 mg/L in the supernatant fluid, and the dry basis moisture content of sludge rises to 7.8. The results showed that adding certain amount of Fenton reagent under hydrothermal condition can greatly improve the dehydration performance of sludge, at the same time, the abundant N/P in supernatant liquid can be used for agricultural irrigation or further biological treatment before discharge,and the stabilized sludge used for land use and building materials,etc. So the technology,which provides certain guiding for the subsequent reduction, haress and resource recovery of sludge,will be a good reference.