1. Shallow air flotation In the initial stage of biofilm cultivation, a small-load water intake method is adopted, so that the surface of the packing layer should be gradually covered by membrane sludge.
2. During the trial operation of shallow air flotation, it is necessary to strictly control various indicators in the biological contact oxidation tank, 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 the 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, which can ensure the stability of the air flotation dosing and facilitate the subsequent biochemical treatment. Generally, it is recommended to add polyiron during this process, and Fe3+ is a trace element for microbial growth.
6. Shallow air flotation needs to check all facilities, pipelines and underwater equipment before operation, and thoroughly clean up all sundries to avoid pipeline and equipment blockage after water supply and maintenance of underwater equipment will affect the smooth progress of commissioning .
7. Shallow air flotation At the initial stage of bacterial culture, a large amount of white foam will appear in the aeration tank, and even the entire biochemical tank walkway will be piled up. Don’t be afraid that this phenomenon is normal, as long as the dissolved oxygen is well controlled and appropriate defoaming measures are taken It can be solved.
8. In the late stage of shallow air flotation operation, it is found that the effluent of the secondary sedimentation tank has flocculent biofilm, and the sludge hopper at the bottom of the sedimentation tank is easy to turn over lumpy sludge, so 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.
The maintenance work and introduction method of shallow air flotation
1. The sludge valve of the shallow air flotation machine is opened once every two days, and the valve is closed after the sludge is exhausted.
2. After the shallow air-floating slewing bearing has been running for 100 hours, the bolt pre-tightening force should be checked once, and then every 400 hours of running to ensure sufficient pre-tightening force; keep adding butter once every 100 hours while rotating , and make a record. The tooth surface should be cleaned of debris frequently and coated with corresponding grease.
3. After the first 500 working hours of the inorganic transmission for the walking frame and scum pipe, replace with new oil and clean the internal oil. The second period is 1000 working hours, and the third period is 2000 working hours. After that, it can be replaced every 2000 Replace every hour. Check the oil level frequently to keep the oil level at the center line of the oil mark.
4. The bearings of the shallow air flotation machine should be filled with synthetic calcium-based grease once a month.
5. The rotary joint can be filled with N32 or N22 mechanical oil through the oil cup.
6. Keep the oil level in the middle of the oil sight glass. After 500 hours of continuous use, replace it once; after 250 hours, clean the muffler filter once, drain the air tank once every 8-14 hours, and clean all parts of the machine once a year
7. The bearing parts of the dissolved air water pump and the dosing pump are often filled with lubricating oil to the normal position. If it is overhauled when the temperature is below zero, the water in the pump should be released to avoid freezing and cracking.
