Views: 679 Author: Site Editor Publish Time: 2024-09-12 Origin: Site
Dissolved air flotation (DAF) is a technology widely used in sewage treatment, mainly used to remove suspended solids, grease, heavy metals, biochemical oxygen demand (BOD), chemical oxygen demand (COD), and volatile organic pollutants in water. The following are the specific requirements of the dissolved air flotation effluent standards compiled based on the reference materials provided:
The suspended solids (SS) of the effluent of the flotation tank can generally be less than 20 to 30 mg/L.
After the first-level flotation treatment, the oil content can be reduced from 50 to 150 mg/L to about 30 mg/L; after the second-level flotation treatment, the oil content of the effluent can reach less than 10 mg/L.
The typical effluent standard of chemical oxygen demand (COD) is 1000 mg/L.
The typical effluent standard of biochemical oxygen demand (BOD) is 500 mg/L.
The typical effluent standard for total nitrogen (TN) is a 50% removal rate.
The typical effluent standard for total phosphorus (TP) is a 90% removal rate.
The typical effluent standard for pH value is 6.5 to 7.
The typical effluent standard for conductivity is a 95% removal rate.
The typical effluent standard for turbidity is a 95% removal rate.
The typical effluent standard for grease and fat is a 95% removal rate.
The typical effluent standard for heavy metals is a 95% removal rate.
The typical effluent standard for volatile organic pollutants is a 95% removal rate.
These standards ensure that the water quality after sewage treatment meets the discharge requirements and guarantees subsequent water resource utilization or discharge.
