NOVELTY - Processing photovoltaic wastewater by zero discharge technique comprises utilizing a device comprising e.g. a collection tank (1), a pH regulation tank (3), a reservoir (4), a raw water pump (5), a bag-type filter (6), ultrafiltration devices I and II, a primary reverse osmosis device, a pure water tank, a secondary reverse osmosis device, a recycle water tank, an electrodeionization (EDI) device, an EDI water tank, a concentrated water tank, a sequencing batch Fenton device, a multi-media filter, an activated carbon filter, a reverse osmosis device and a programmable logic controller system.    USE - The method is useful for processing photovoltaic wastewater by zero discharge technique.    ADVANTAGE - The method: recycles more than 97% of the original discharged water into the production line and hence requires only a minimum amount of fresh water; treats only a small amount of sewage for forming sludge which is landfilled in a harmless manner; utilizes device, which covers a small area and has high degree automation; and produces water resource with a multipurpose utilization rate of more than 97%.    DETAILED DESCRIPTION - Processing photovoltaic wastewater by zero discharge technique comprises utilizing a device comprising a collection tank (1), a pH regulation tank (3), a reservoir (4), a raw water pump (5), a bag-type filter (6), ultrafiltration devices I and II, ultrafiltration water tanks I and II, high-pressure pumps I, II, III, IV, V and VI, a primary reverse osmosis device, a pure water tank, a secondary reverse osmosis device, a recycle water tank, an electrodeionization (EDI) device, an EDI water tank, a concentrated water tank, a sequencing batch Fenton device, a multi-media filter, an activated carbon filter, a reverse osmosis device, a dosing device, concentrated water pipelines I, II, III, IV V and VI and a programmable logic controller system. The production process comprises passing the production wastewater of the collection tank sequentially into the pH regulation tank and the reservoir via the high-pressure pump I and the dosing device, and then into the bag-type filter, the ultrafiltration device I and the ultrafiltration water tank I via the raw water pump. The water from the ultrafiltration water tank is passed into the primary reverse osmosis device via the high-pressure pump VI. The water is passed into the pure water tank and the concentrated water into the concentrated water tank via the concentrated water pipeline II. The wastewater is introduced into the sequencing Fenton device via the high-pressure pump VI and then to the multi-media filter, the activated carbon filter and the ultrafiltration device II via the high-pressure pump VI. The water from the ultrafiltration device is passed into the ultrafiltration water tank II and the concentrated water pipeline V, passing the wastewater into the reverse osmosis device via the high-pressure pump VI and then into the pure water tank and then to the secondary reverse osmosis device via the high-pressure pump III. The effluent from the secondary reverse osmosis device is passed into the recycle water tank via the concentrated water pipeline III and then into the EDI device through the high-pressure pump IV and the concentrated water pipeline III. The water generated in the EDI device is introduced into the EDI water tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the method for processing photovoltaic wastewater by zero discharge technique.    Collection tank (1)    pH regulation tank (3)    Reservoir (4)    Raw water pump (5)    Bag-type filter (6)