The invention discloses a decoloring treatment method of printing and
dyeing wastewater. The decoloring treatment method of the printing and
dyeing wastewater is characterized by comprising the following steps: placing the printing and
dyeing wastewater into a container or a
treatment pond; performing suspended substance filtering treatment on the printing and
dyeing wastewater; adding 3 to 6 square meters of nano-
titanium dioxide immobilized catalytic pieces into each cubic meter of printing and
dyeing wastewater which is subjected to filtering treatment; adding
hydrogen peroxide, wherein the volume of the
hydrogen peroxide is 0.001 to 0.01 percent of that of the printing and
dyeing wastewater which is subjected to filtering treatment; stirring completely; irradiating by using a mercury lamp. The nano-
titanium dioxide immobilized catalytic pieces are prepared by fixing
titanium dioxide on the surface of
ceramic by a physical burning and solidifying manner, have a good physical contact effect, are difficult to separate and achieve a long-term effective
catalytic effect; the spectral range of the mercury lamp is wide and close to a natural spectrum, so the safety is higher; the nano-
titanium dioxide immobilized catalytic pieces and organic matters in the printing and dyeing wastewater generate
chemical reaction, so the color organic matters in the printing and dyeing wastewater can be effectively decolored and the
treated water is free from secondary
pollution.