→ adjust → pH adjusted wastewater pond aeration tank → → → settling tank effluent 
 However, the law exists for water quality, quantity changes more sensitive, intolerant of organic shock loading, sludge production capacity, cumbersome and expensive process, easy to sludge bulking, covers an area of ??large, etc, later changed to bio-contact oxidation treatment . 
 Using the conventional activated sludge, biological contact oxidation of COD removal rate is generally 92% to 82%. However, if the requirements of an effluent discharge standards, (COD) <100 mg / L, the influent (COD) <= 1 250mg / L, the aerobic treatment unit volume load is not high. 
 2 PACT process 
 Through the conventional activated sludge and powdered activated carbon added to activated sludge process of PACT found that, under the same conditions PACT Process efficiency than the conventional activated sludge process increased about 38.42%. Need to deal with waste water unit can also go to the sewage service platform project consulting Po sewage treatment experience with similar companies.