Method for pre-treating high-concentration wastewater by using biochemical sludge

The invention discloses a method for pre-treating high-concentration wastewater by using biochemical sludge. The method comprises the following steps: a, firstly, mixing the high-concentration wastewater with the biochemical sludge generated by an aerobic biochemical system; in the mixing process, the biochemical sludge adsorbs organic matters and refractory substances in the high-concentration wastewater to realize pretreatment of the high-concentration wastewater; b, the biochemical sludge adsorbed with the organic matter is separated from high-concentration wastewater through a separation device, and the separated biochemical sludge is subjected to filter pressing treatment; the separated clear water enters the biochemical system, COD is removed in the aerobic biochemical system, new biochemical sludge is generated at the same time, and the generated new biochemical sludge is preposed to the front end to be mixed with the high-concentration wastewater which is not pretreated. According to the method, the b