Sewage treatment plant operation and maintenance technical scheme

2, the operation management personnel should strengthen the inspection of the sewage quality, and regularly carry out the beaker mixing test. By changing the type of coagulant or coagulant aid, changing the dosage of coagulant and changing the stirring intensity of the mixing process, the best coagulant conditions can be determined. For example, when the amount of water or the concentration of SS in water changes, the dosage of coagulant should be adjusted appropriately; When the water temperature or PH value of the effluent changes, the coagulant or coagulant aid can be changed to improve the coagulant effect. When the content of organic colloidal particles in water changes, the coagulant or coagulant aid should also be adjusted in time.

(3) When mechanical mixing is used, the mixing gradient in the mixing area should be regularly tested and calculated (G) to adjust the speed of the mixing equipment or adjust the inflow water when the problem is applied. When using pipe mixing or static mixer mixing, due to the reduction of flow rate, the flow rate will be reduced, resulting in insufficient mixing strength. For other types of non-mechanical mixing methods, there are similar situations, at this time should strengthen the reasonable scheduling of operation, as far as possible to ensure that there is sufficient flow rate in the mixing zone. As for hydraulic flocculation reaction pond, the flow rate should be adjusted to ensure its flow speed.

4, the sludge in the flocculation reaction tank should be removed regularly to avoid the reduction of the volume of the reaction area, and the increase in the flow rate in the tank will shorten the melon time, resulting in a decrease in the coagulation effect.

5. A large amount of mud accumulates between the end of the reaction tank and the water distribution wall of the sedimentation tank, which will block the water distribution port, make the port flow rate too large, break the alum flower, and precipitate difficult. At this time, the operation should be stopped to remove mud.

6, the sedimentation tank should reasonably determine the number of mud discharge and mud discharge time, the operator should be timely and accurate mud discharge. Otherwise, a large amount of sludge will be accumulated in the sedimentation tank, which will reduce the effective pool capacity and make the flow rate in the sedimentation tank too large.

7. Inspection should be strengthened to ensure the leveling of the effluent weir of the sedimentation tank. Otherwise, the uneven discharge of the sedimentation tank will cause short flow in the tank, which will destroy the precipitation effect of alum flower.

8, should often observe the mixing, reaction sludge discharge or dosing equipment operating status, timely maintenance, failure in time to replace repair.

9. Regularly clean dosing equipment and keep it clean and hygienic; Clean the pool walls regularly to prevent algae growth.

10, regularly calibrate dosing metering facilities, should be replaced if necessary, to ensure accurate measurement.

11. Strengthen the inspection of pharmaceutical stocks to prevent drug deterioration and failure. Special attention should be paid to ferrous sulfate. The principle of "store before use" should be implemented.

12. The health and safety system must be strictly implemented when dispensing medicines, and rubber gloves and other labor protection measures must be taken.

13, do a good job of analysis, measurement and record.

3.3 Operation and management of biochemical aeration tank and secondary sedimentation tank

(1) Operation and management of traditional activated sludge treatment systems

1, often check and adjust the aeration tank water distribution system and return sludge distribution system to ensure that the sewage and sludge is uniform between each series or each tank.

2. The static settling rate, SV and SVI of the mixed liquid in the aeration tank are often observed. If the activated sludge bulks up, it is judged that the following reasons exist: too little organic matter in the effluent, too low F/M load in the aeration tank, insufficient nitrogen and phosphorus nutrition in the effluent, and low PH value is not conducive to the growth of bacterial collops; Mixed liquid DO is low; The water temperature of the sewage is too high.