The ways of flocculation sedimentation and filtration to treat sewage are as follows: the sewage to be treated enters the raw water inlet through the lifting pump, the inorganic coagulant (PAC) agent enters the coagulation area simultaneously through the metering pump, and the flow of water entering the flocculation area from bottom to top forms a drop. The power driving force is installed on the spindle, which is rotated by the agitating slurry connected with the axle sleeve, and the water and medicine are agitated together; similarly, some of them are installed in the flocculation area. Under the agitation of the stirring slurry, the organic macromolecule flocculant (PAM) added by the metering pump in the flocculation zone is fully mixed with the flocculant by the stirring slurry. The water mixed by the two agents flows into the reaction zone from the bottom to the top and then into the buffer zone from the top to the bottom. The water coming out of the flocculant zone flows into the sedimentation zone, and the water entering the sedimentation zone forms alum-like turbid water after about an hour. Material with a specific gravity of more than water sinks into the sedimentation zone, and suspended matter rises in the range of free form and is separated by honeycomb inclined pipe; clear water passes through the outlet weir and enters the catchment tank, while free suspended matter sticks to the inclined pipe of honeycomb. Sewage entering the catchment tank passes through the outlet and enters the filter tank tank through the height drop of the filter tank. Activated zeolite of 0.5-1.0 mm is filled in the filter tank. It filters the residual suspended matter, adsorbs ammonia nitrogen phosphate ion and iron ion contaminants; its effluent enters the adsorption tank through the connecting pipe, decolorizes, deodorizes and further reduces the soluble COD concentration with 10-24 mesh activated carbon in the tank; finally, the effluent is discharged or reused through the discharge port.

According to the above method, a flocculation sedimentation filtration integrated sewage treatment device is made, which has remarkable treatment effect on COD5, which produces high concentration suspended substances and insoluble organic substances in the process, fast settling speed, good treatment effect and strong impact load resistance. 95% colloidal particles can be removed, and the turbidity of water after sinking can be guaranteed to be less than 1.1 NTU by controlling dosage.

The flocculation settling and filtration equipment has the characteristics of short settling time, small area, high impact load resistance and stable operation, which will have a good application prospect in wastewater treatment.www.khnwatertreatment.com