SHI Hao-ran.Performance Evaluation and Optimization Solutions of Combined Sewer Overflow Storage and Treatment Process[J].China Water & Wastewater,2021,37(5 5):106-110.
Performance Evaluation and Optimization Solutions of Combined Sewer Overflow Storage and Treatment Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
5 5
Page:
106-110
Column:
Date of publication:
2021-03-01
- Keywords:
- combined sewer overflow; storage and treatment process; initial rainwater; ammonia nitrogen
- Abstract:
- In view of the problems caused by the fluctuation of initial rainwater and combined sewer overflow wastewater quality and quantity, such as insufficient treatment capacity of regulation and storage project, high operation energy consumption, difficulty in effectively collecting combined sewer overflow wastewater with high load, etc, the quality and quantity characteristics of combined sewer overflow wastewater entering into regulation and storage project in different periods was analyzed, and the treatment effect of combined sewer overflow by the combined process of high efficiency fine sand sedimentation tank, contact oxidation tank and D-type filter was investigated through the water quality analysis along the process. The initial rainwater and combined sewer overflow were characterized by large fluctuation of water quality and quantity, high ammonia nitrogen and low COD. Therefore, ammonia nitrogen was the key index for the effluent of storage and treatment process to meet the discharge standard. At the same time, the low COD concentration in the influent of the biochemical treatment unit was not conducive to the growth of biofilm in the contact oxidation tank, which reduced the actual treatment capacity of the process. Suggestions were as follows: a precipitation unit should be set after the contact oxidation tank to ensure effluent SS and TP meeting the discharge standard; multi-point feeding mode should be adopted in contact oxidation tank, and carbon source adding devices should be reserved; a precise aeration control system should be installed to achieve energy saving and consumption reduction.
Last Update:
2021-03-01