It is estimated that the first phase investment in wastewater reclamation and reuse is 392 yuan/m~3 and water producing cost is 0.46 yuan/m~3,which is of obvious superiority comparing to the current water price in Xining City.
The integrated reactor of coagulation and sedimentation/BAF was used for school wastewater reclamation and reuse treatment. The removal efficiencies of SS,COD,NH3-N and TP by the integrated reactor were investigated.
The feasibility of using recycling water in some fields is discussed. The integer and hierarchy of this system are proposed. The structure of wastewater regeneration and reuse system is divided into three subsystems, the reclaimed water demand system, the reclaimed water supply system and the municipal water demand and supply system.
An advanced treatment process,microflocculation-derict filtration-two step activated carbon adsorption-ClO_2 oxidation disinfection,was developed to treat the wastewater from a grease chemical plant. After the laboratory experiments,an industrial demonstration on the regeneration and reuse of grease wastewater was carried out in a plant of 400m~3/d.
According to the water shortage status in Xining City,the near and long-term capacities of wastewater reuse are determined as 6.2×10~4 m~3/d and 12.8×10~4 m~3/d respectively,and the recommended water quality of reclaimed water is given;
Through a tertiary treatment including coagulation,sedimentation and sulphonated carbon treatment,the COD and oil contents of the final effluent from Beijing Heavy-Duty Machinery Factory are reduced respectively from 100-200 mg/L to below 10 mg/L and from 20-50 mg/L to below 5rag/L,and the quality of the treated water meets the factory's controlled values for reuse.