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.
新型重力浓缩池在给水厂污泥浓缩中的应用
- Title:
- Application of New Type of Gravity Thickening Tank for Sludge Concentration in Waterworks
- Keywords:
- waterworks; sludge discharge water; new type of gravity thickening tank; high efficiency mixing and flocculation; high solids loading
- 摘要:
- 给水厂传统重力浓缩池通常存在故障率高、运行不稳定、出泥含固率低、上清液浑浊等问题。为提升重力浓缩池应用水平，研发了一种新型重力浓缩池，其利用加药后污泥所具备的高效混合絮凝等特性，辅以高水深池体，充分发挥拥挤沉淀作用，实现对排泥水中悬浮物的截留和污泥的高效浓缩。中试结果表明，当表面负荷为1 m3/（m2·h）、固体负荷为6 kg/（m2·h）、阴离子型聚丙烯酰胺（PAM）投加量为2.56 mg/g干泥时，出水上清液浊度可保持在1~10 NTU，平均值为3 NTU，且排泥口含固率可达5%以上，实现较传统浓缩池提高2%的目标，从而提高了污泥脱水单元的运行效能。
- 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.
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