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.
Analysis of Grit Sediment in a Sewage Treatment Plant and the Prevention Countermeasures
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第18期
Page:
107-111
Column:
Date of publication:
2023-09-17
- 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.
Last Update:
2023-09-17