TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The concentrated water discharged from the ultrafiltration device I is passed through a concentrated water pipeline I into the reservoir and the concentrated water tank. The water generated from the ultrafiltration device I is introduced into the ultrafiltration water tank I and is pumped into the primary reverse osmosis device by the high-pressure pump II. The concentrated water discharged from the primary reverse osmosis device is passed into the concentrated water tank via the concentrated water pipeline II. The water generated from the reverse osmosis device is introduced into the pure water tank and is pumped into the secondary reverse osmosis device by the high-pressure pump III. The concentrated water discharged from the secondary reverse osmosis device is passed into the ultrafiltration water tank via the concentrated water pipeline III. The water generated from the secondary reverse osmosis device is introduced into the recycle water tank, and is pumped into the EDI device by the high-pressure pump IV. The concentrated water discharged by the EDI device is passed into the pure water tank via the concentrated water pipeline IV. The water generated from the EDI device is used for photovoltaic production. The high-pressure pump V pumps the wastewater into the concentrated water tank into the sequencing batch Fenton device for reaction. The high-pressure pump III extracts supernatant and pumps into the multi-media filter. The water generated is directly introduced into the activated carbon filter and then the generated water is introduced into the ultrafiltration device II. The water generated from the ultrafiltration device II is introduced into the ultrafiltration water tank II. The concentrated water of the ultrafiltration device II is passed into the concentrated water tank via the concentrated water pipeline II. The high-pressure pump VI extracts water from the ultrafiltration water tank II and pumps the water into the reverse osmosis device. The water generated from the reverse osmosis device is introduced into the pure water tank. The discharged concentrated water is passed to the concentrated water tank and a wastewater treatment system through a concentrated water pipeline VI. The concentrated water tank collects the concentrated water from the ultrafiltration device I, the primary reverse osmosis device and the reverse osmosis device.    TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The ultrafiltration devices are hollow fiber membranes made of polysulfone material or a polyether sulfone material with a molecular weight cutoff of 10000 daltons. The sequencing Fenton device comprises (in wt.%) a mixture of hydrogen peroxide (30), ferrous sulfate (10) and water (balance amount).