November 27, 2020
By adding the coagulant PAC and the coagulant aid PAM to the wastewater, the suspended solids, oils and colloids in the wastewater are removed to ensure the normal and stable operation of the subsequent biological treatment unit.
Open the air flotation tank to control the inlet water pressure to about 0.5Mpa, and the dissolved air pressure to about 0.4Mpa. When closing, first close the small water inlet valve and control the inlet water pressure to about 0.3 Mpa before stopping the dissolved air system.
The air compressor must drain the oil regularly during the day shift every day, clean the filter element frequently, and record the refueling.
Frequently observe the flow of PAC, PAM and the coagulation of wastewater. The scum in the coagulation tank should be cleaned up in time. If the scum is very thick, the system should be vented to avoid affecting the coagulation effect.
After adjusting the flow rate, observe the liquid level of the air flotation tank. If it is too high, water will flow into the slag scraping tank. The liquid level of the air floatation tank can be controlled by adjusting the outlet pipe.
Always observe the water outlet on both sides of the metering tank to ensure that the amount of water entering the two systems is the same. If it is not the same, adjust the water outlet pipe to control the flow.
Always observe the flow rates on both sides of phosphate and methanol to ensure that both sides are balanced.
Frequently observe the size of the alum flower particles at the end of the air flotation and whether the effluent is turbid, combine the inlet SS and do a coagulation experiment, and adjust the dosage of PAC and PAM.
The air flotation tank scraper starts regularly according to the set time interval to scrape the scum to the slag discharge tank.
Frequently observe the operation of each equipment, and promptly remove any faults.
The releaser is the key to the dissolved air flotation. If it is blocked, it should be repaired in time to ensure the treatment effect.
Regularly open the vent valve at the bottom of the air flotation system to remove the sludge. If it is serious, stop the machine to clean the sludge.
