YANGXi,TANGWei-wen,CHENWei-xiong,et al.Application of New Type of Gravity Thickening Tank for Sludge Concentration in Waterworks[J].China Water & Wastewater,2024,40(17):65-70.
Application of New Type of Gravity Thickening Tank for Sludge Concentration in Waterworks
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第17期
Page:
65-70
Column:
Date of publication:
2024-09-01
- Keywords:
- waterworks; sludge discharge water; new type of gravity thickening tank; high efficiency mixing and flocculation; high solids loading
- Abstract:
- The traditional gravity thickening tank utilized in waterworks typically encounters several issues, such as frequent malfunctions, unstable operation, low solid content in the discharged sludge, and high turbidity of the supernatant. A new type of gravity thickening tank was developed to promote its application. It fully utilized the high efficiency mixing and flocculation characteristics of the coagulated sludge and was complemented by a deep water tank to fully exert the crowded sedimentation effect, thereby achieving the interception of suspended matters in the discharged sludge water and the efficient concentration of the sludge. The pilot test findings indicated that the turbidity of the supernatant in the effluent could be maintained within the range of 1 NTU to 10 NTU, with an average value of 3 NTU, and the solid content at the sludge outlet could reach over 5% when the surface load was 1 m3/(m2·h), the solid load was 6 kg/(m2·h), and the dosage of anionic PAM was 2.56 mg/g dry sludge. The operational efficiency of the sludge dewatering unit was increased by 2% compared to the traditional thickening tank.
Last Update:
2024-09-01