Abstract:

The effects of the coordination of the modified water supply sludge(MS) and FeCl₃ on the deep dewatering of sludge were studied. The experimental results showed that sludge could be effectively dewatered by MS/FeCl₃ and the applications, and the turbidity and soluble chemical oxygen demand(SCOD) of the supernatant were greatly decreased by the introduced cations in the system, which had a certain application prospect. Based on dry weight of sludge(DS), when the dosages of MS and FeCl₃ were 30%DS and 60 mg/g, the specific resistance of sludge(SRF) and capillary water absorption time(CST) decreased by 70.8% and 60.2% respectively, and the net sludge yield(Y_N) increased by 62.1%. When the dosages of MS and FeCl₃ were 50% and 60 mg/g, the water content(W_c) of sludge cake dropped to 64.9%, the polysaccharide and protein in EPS decreased by 26.0% and 37.1% respectively, and the compressibility(s) decreased by 46.0%.

Key words: sludge dewatering, water supply sludge, FeCl₃, resource utilization

摘要：

以改性给水污泥（MS）协同FeCl₃调理污泥，考察其对脱水效果的影响。结果表明，MS/FeCl₃调理污泥脱水效果较好，体系中引入的阳离子使上清液浊度和溶解性化学需氧量（SCOD）大大降低，有一定的应用前景。以污泥干重（DS）计，在30% MS和60 mg/g FeCl₃条件下，污泥比阻（SRF）和毛细吸水时间（CST）分别减少70.8%和60.2%，污泥净产率（Y_N）增加62.1%；在50% MS和60 mg/g FeCl₃条件下，泥饼含水率（W_c）降至64.9%，胞外聚合物（EPS）中多糖和蛋白质分别降低26.0%和37.1%，压缩系数（s）降低46.0%。

关键词: 污泥脱水, 给水污泥, FeCl₃, 资源化

CLC Number: 

• X703