Method for treating lignite quality-improving waste water through aerobic cometabolism

The invention relates to a method for treating lignite quality-improving waste water through aerobic cometabolism, relating to a method for treating coal chemical industry waste water and solving the problems of poor removal effect of an aerobic reactor on a pollutant component which can not be directly used as a microbe nutrient substance or smaller quantity and poorer flora function of microbe florae capable of degrading the substance. The method comprises the following main steps of selecting the lignite quality-improving waste water; selecting trehalose as a first substrate used for the cometabolism, wherein the addition amount of the trehalose is regulated and controlled by an automatic addition system; and by taking return sludge of a secondary sedimentation tank of an urban sewage plant as inoculated sludge, keeping the hydraulic retention time of the aerobic reactor at 18-24 hours, and controlling a stable working condition. According to the method, the trehalose is taken as the first substrate, so that an organic substance which can not be taken as an aerobic microbe direct substrate can be degraded or the growth and propagation of an aerobic microbe which takes the substance as the substrate are intensified; after the operation is stable, the COD removal ratio of the lignite quality-improving waste water subjected to aerobic treatment can achieve more than 85%, and the total phenol removal ratio can achieve more than 80%.