Economic Model Of Municipal Water Recycling And Technique Supporting System

China is a country facing severe fresh water shortage. To resolve the fresh water shortage and water environmental pollution, the fundamental strategy is water recycling.This work elaborated the concepts, characteristics, significance, and theorem of water recycling. The evolutions and technique practice of water recycling are studied, which includes, waste water treatment at the source — small scale recycling; reuse and reclamation of municipal waste water — medium scale recycling; the composite recycling form of rainfall water and reclaimed water ~ large scale recycling. An analysis on the economy of water recycling is performed. In the water recycling economy, utilization of wastewater resource is the major approach, and the key is to integrate existing water treatment technologies while create new technologies. A review of the current treatment technologies and reuse applications of household and petrochemical wastewater is given in this work.A series of pilot test cases and practical applications of municipal and petrochemical wastewater treatment systems are demonstrated. Based on the wastewater pollutant components and treatment requirements, the key technology is selected and integrated with optimized process design, such as:1. Wastewater from hotels: Integrated Membrane Biological Reactor (MBR)2. Wastewater from oil mining: Integrated Membrane Biological Reactor (MBR) + Biological Aerated Filter (BAF )3. Wastewater from PVC manufacture: Moving Bed Biofilm Reactor (MBBR)4. Wastewater from petrochemical industries: Moving Bed Biofilm Reactor (MBBR)+ Reverse Osmosis (RO)5. Deep treatment and recycle of municipal wastewater and wastewater from power plant which meets Standard B: High efficient Biological shake-bed (GX) +Reverse Osmosis (RO)6. Municipal wastewater: to reach first level of Standard B and confirmed by pilot test. The processes described in 1, 3, 4and 6 have been applied to realistic treatment systems.The operating effectiveness has been validated and the treated water has met the quality criteria.