循环造粒流化床处理水厂排泥水的试验研究

以西安市某自来水厂的沉淀池排泥水为处理对象,采用循环造粒流化床技术先进行工艺参数优化中试,再进行生产性试验研究。中试结果表明,循环造粒流化床的运行稳定性较高,即使进水浊度在200～800 NTU范围内变化或进水上升流速在25～70 cm/min之间变化,出水浊度仍可稳定保持在10 NTU以下;工艺优化参数如下:上升流速为70 cm/min,搅拌转速为5～8 r/min,助凝剂聚丙烯酰胺(PAM)投加量为4～5 mg/L。在中试的基础上进行生产性试验,出水浊度始终稳定在10 NTU以下,最佳间歇排泥间隔为4 h,出泥含水率为95. 8%,处理成本为0. 1元/m3。中试及生产性试验结果表明,采用循环造粒流化床处理排泥水,具有出水水质好、抗冲击负荷能力强、污泥浓缩效果好、处理成本低等优点。

Treatment of Sludge Water in Waterworks by Circulating Granulation Fluidized Bed

A pilot test treating sludge water from the sedimentation tank of a waterworks in Xi’an City was carried out by using the circulating granulation fluidized bed technology to optimize the process parameters,and then a production test was carried out.According to the pilot test results,the circulating granulation fluidized bed had high operational stability.Even if the influent turbidity varied within 200-800 NTU or the influent upflow velocity varied between 25 cm/min and 70 cm/min,the effluent turbidity was always less than 10 NTU.The optimized parameters of the process were as follows:upflow velocity of 70 cm/min,stirring speed of 5-8 r/min,and PAM dosage of 4-5 mg/L.During the productive operation under the above optimized conditions,the effluent turbidity was always less than 10 NTU,the optimal interval of intermittent sludge discharge was 4 hours,the moisture content of the discharged sludge was 95.8%,and the treatment cost was 0.1 yuan/m^3.The results indicated that the treatment of sludge water by the circulating granulation fluidized bed had the advantages of good effluent quality,strong shock load resistance,good sludge concentration effect and low treatment cost.