A printing and dyeing wastewater treatment and reuse method, comprising the steps of:
- (1) desulfurization by flowing combined printing and dyeing wastewater into a coarse filter to remove large particles of solids prior to flowing into a regulation pool, pumping the combined printing and dyeing wastewater out of the regulation pool to pass through a hydraulic sieve to remove fibers and impurities prior to flowing into a desulfurization pool, adding ferrous sulfate solution to the combined printing and dyeing wastewater, performing desulfurization, and separating the combined printing and dyeing wastewater into iron sulfide sludge and desulfurized wastewater;
- (2) nanocatalytic electrolysis by pumping the desulfurized wastewater into a nanocatalytic electrolyzer for electrolysis;
- (3) flocculation by flowing the electrolyzed wastewater into a flocculation pool, adding flocculants, coagulant agents, and flotation agents to the flocculation pool for flocculation, flowing the flocculated wastewater to a settling pool for forming precipitate, flowing the precipitate on a bottom of the settling pool to a compressor for separating into filtrate and sludge, flowing the wastewater in the settling pool to a flotation device for separating impurities from the wastewater, and flowing the impurities from the flotation device to the compressor for separating into filtrate and sludge;
- (4) biochemical treatment by flowing the wastewater in the lower portion of the flotation device into a biochemical pool, subjecting the wastewater to an aerobic treatment, an anaerobic and aerobic treatment, or an anoxic and aerobic treatment, and subjecting the wastewater to a biochemical treatment in a secondary settling pool for forming precipitate;
- (5) secondary catalytic electrolysis by flowing the biochemically treated wastewater out of an upper portion of the secondary settling pool into a secondary nanocatalytic electrolyzer for electrolysis;
- (6) filtration by flowing the electrolyzed wastewater from the secondary nanocatalytic electrolyzer into a fine filter to remove solid impurities;
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- (7) membrane separation by flowing a filtrate out of the fine filter through a nanomembrane assembly for separating into dialysate and concentrate wherein the dialysate is water for reuse and the concentrate is for discharge.