The application of the integrated technology of flocculation combined with precoating filtration in wastewater reuse

The integrated technology of flocculation combined with precoating filtration was utilized in advanced treating the effluent of city sewage disposal plant to a reuse standard. The results indicated that, with PAC dosage 75 mg·L-1, bentonite dosage 100 mg·L-1 and initial filtration rate 2.26 m·h-1, total phosphor and COD concentration decreased from 5.0 mg·L-1 to 0.3 mg·L-1, and from 100 mg·L-1 to 30 mg·L-1 respectively. Some relationship existed between filtration rate and filtrated water volume. Compared with the conventional flocculation reaction and separation technology, the integrated technology raised the effluent water quality, achieved high efficient separation, and it had a good application prospect in wastewater treatment.