Treatment of Sludge Water in Waterworks by Circulating Granulation Fluidized Bed
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
7 7
Page:
12-18
Column:
Date of publication:
2020-04-01
- Keywords:
- circulating granulation fluidized bed; sludge water in waterworks; turbidity; parameter optimization
- Abstract:
- 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/m3. 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.
Last Update:
2020-04-01