WANGBao-gui,LINHong-yong,LIUYu-ting,et al.Analysis of Grit Sediment in a Sewage Treatment Plant and the Prevention Countermeasures[J].China Water & Wastewater,2023,39(18):107-111.
污水处理厂积砂情况分析与防治对策
- Title:
- Analysis of Grit Sediment in a Sewage Treatment Plant and the Prevention Countermeasures
- 摘要:
- 对某污水处理厂积砂情况进行调研，发现在前置缺氧区、厌氧区、出水口下游和内回流廊道转弯处存在明显积砂，且前置缺氧区和厌氧区积砂最为严重。对积砂的粒径分布进行分析表明，前置缺氧区和厌氧区的积砂中粒径>0.2 mm的分别占48%和51%，其他区域为30%左右。曝气沉砂池除砂效率低，导致大量砂粒进入生物系统，这是造成生物系统积砂的直接原因；而生物系统结构设计缺陷、混合功率不足是造成生物系统积砂的重要原因。因此，需要实施曝气沉砂池精细化运维，提升沉砂池的除砂效率；增设搅拌设备和导流设施，减少砂粒沉积。
- Abstract:
- The grit sediment of a sewage treatment plant was investigated, and it is found that there are obvious grit sediments in the pre-anoxic zone, anaerobic zone, downstream of the outlet and the turning point of the internal return corridor, among which most are in the pre-anoxic zone and the anaerobic zone. The analysis of particle size distribution shows that 48% and 51% of grit particles with size over 0.2 mm are in the pre-anoxic zone and anaerobic zone, and about 30% are in other points. The low grit removal efficiency of the aerated grit chamber leads to a large number of grit entering the biological system, which is the direct cause of grit sediment in the biological system. The structural design defects and insufficient mixing power in biological systems are main causes of the grit sediments. Therefore, it is necessary to implement refined operation and maintenance of aerated grit chamber to improve the grit removal capacity, as well as add mixing equipment and diversion facilities to reduce sand deposits.
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