Preparation and application of printing and dyeing sewage treatment agent

The invention discloses preparation and application of a printing and dyeing sewage treatment agent. The preparation steps are follows: adding a coconut shell powder into a phosphoric acid solution for soaking, calcinating for activation, and then adding a copper nitrate solution and an yttrium nitrate solution for modification, and calcinating to obtain modified coconut shell activated carbon; adding an organic modifier and aluminum chloride into deionized water, then adding bentonite, reacting, and grinding to obtain modified bentonite; taking modified coconut shell activated carbon powder,polymeric ferric trichloride, polyaluminum chloride, modified bentonite, corn starch, sodium acetate, polyacrylamide, polysorbate, plant fiber and ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid, uniformly mixing, and granulating to obtain the sewage treatment agent. The invention has the beneficial effects as follows: by the preparation method, raw materials are compounded to play a coordinated role