1. Shallow air flotation In the initial stage of biofilm culture, a small load water inlet method is used, so that the surface of the packing layer should be gradually covered by film-like sludge.
2. During the trial operation of shallow air flotation, various indicators in the biological contact oxidation tank need to be strictly controlled, such as DO, temperature, PH value changes, microbial growth status and types, etc.
3. The thickness of the shallow air-floated biofilm must be strictly controlled to ensure smooth shedding of the biofilm.
4. During the operation of biological contact oxidation, the sludge load is controlled between 0.2-0.3kgBOD5/kgMLSS
5. The water quality of the shallow air flotation dosing treatment must meet the standard to ensure the stability of the air flotation dosing to facilitate subsequent biochemical treatment. Generally, it is recommended to add polyiron during this process. Fe3+ is a trace element for microbial growth.
6. Before shallow air flotation operation, all facilities, pipelines and underwater equipment need to be inspected, and all debris must be thoroughly cleaned to avoid blockage of pipelines and equipment after water is passed, and maintenance of underwater equipment that affects the smooth progress of debugging. .
7. Shallow air flotation In the early stages of bacterial culture, a large amount of white foam will appear in the aeration tank, and may even accumulate on the entire biochemical tank walkway board. Don’t be afraid. This phenomenon is normal. As long as you control the dissolved oxygen and take appropriate defoaming measures. It can be solved.
8. In the late stage of shallow air flotation operation, it was found that the effluent from the secondary sedimentation tank contained flocculent biofilm, and the sludge hopper at the bottom of the sedimentation tank was prone to turning into clumps of sludge. Therefore, the sludge at the bottom of the sedimentation tank should be discharged as soon as possible to reduce sludge. Residence time in the secondary settling tank.
