▎ 摘　　要

NOVELTY - Sewage treatment agent comprises 8-11 pts. aluminum sulfate, 10-13 pts. ferrous sulfate, 3-6 pts. polyacrylamide, 11-15 pts. sepiolite powder, 2-5 pts. calcium hydroxide, 1-3 pts. activated calcium silicate, 15-19 pts. propylene bis(octadecyldimethyl)ammonium-bentonite, 1-2 pts. ethylene glycol-bis (2-aminoethyl ether)-N,N,N',N'-tetraacetic acid, 2-5 pts. chitosan-graphene composite, 24-27 pts. polyaluminum chloride and 18-22 pts. polyacrylamide. USE - The sewage treatment agent is useful for treating printing and dyeing industry wastewater. ADVANTAGE - The treatment agent is economical, and does not cause toxicity and secondary pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing sewage treatment agent, comprising: (i) crushing the polyacrylamide and sieving via 200-400 meshes sieve to obtain polyacrylamide powder; (ii) mixing the sepiolite powder and activated calcium silicate for 40-50 minutes to obtain a first mixture; (iii) uniformly mixing aluminum sulfate and ferrous sulfate to obtain a second mixture; (iv) adding 5-7 times amount of water into 60-70% second mixture, heating at 70-75 degrees CoC by stirring for 10-20 minutes to obtain a third mixture; (v) heating the first mixture to 85-90 degrees C for 40-50 minutes, subjecting to ultrasonic treatment at 85-90 degrees C for 60- 70 minutes with an ultrasonic power of 1200 W to obtain a fourth mixture; (vi) drying the fourth mixture at 150-160 degrees C and pulverizing to obtain a fifth mixture; and (vii) mixing the remaining raw materials with fifth mixture and second mixture to obtain the product.