YAN Ying-ying,MENG Chun-lin,LIANG Yuan,et al.Continuous Deep Dewatering Coupled with Low Temperature Drying Process in Yingtan Sludge Treatment Plant[J].China Water & Wastewater,2020,36(16):105-110.
连续深度脱水耦合低温干化工艺用于鹰潭污泥处理厂
- Title:
- Continuous Deep Dewatering Coupled with Low Temperature Drying Process in Yingtan Sludge Treatment Plant
- Keywords:
- sludge treatment; deep dewatering; low temperature drying
- 摘要:
- 鹰潭市污泥处理厂设计处理规模为65 t/d（污泥含水率为80%），采用连续深度脱水耦合低温干化两段式组合工艺。第一段是干化前的预脱水，利用高压带式压滤机将污泥含水率由80%降至65%~70%；第二段是污泥低温干化设备，采用对流热风干燥的方式对网带上的湿料污泥进行脱水干化减量至含水率为20%。实践表明，在低温干化工艺前端增加机械深度脱水段，可以降低整体的投资和运行成本。此外，两段式工艺提高了系统的灵活性及生产保障冗余度，干化污泥的处置出路近期为园林绿化肥料骨料，远期送至垃圾焚烧厂进行掺烧。该工程的成功运行实现了鹰潭市污泥的减量化和资源化，对城镇污水处理厂污泥处理处置工艺选择具有示范意义。
- Abstract:
- The combined two-stage process of continuous deep dewatering coupled with low temperature drying was adopted in Yingtan sludge treatment plant with the capability of 65 t/d (the sludge water content was 80%). In the first stage of pre-dewatering before drying, the high-pressure belt filter press was used to reduce the water content to 65%-70% from 80% by mechanical dewatering. In the second stage of low temperature drying equipment, the water content of the wet sludge was reduced to 20% by convection hot air drying. The practice showed that adding a mechanical deep dewatering section at the front of the low temperature drying process could reduce the overall investment and operating costs. Furthermore, the two-stage process could enhance the flexibility and production guarantee redundancy of the system, the treated sludge were used as aggregate of landscaping fertilizer and would be sent to waste incineration plant in the long term. The successful operation of the project has realized the reduction and resource utilization of sludge in Yingtan, which is of demonstration significance to the selection of sludge treatment and disposal process in municipal wastewater treatment plant.
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