▎ 摘　　要

NOVELTY - Sewage treatment agent comprises 8-20 pts. wt. chitosan-cured tannins, 30-35 pts. wt. sodium-based bentonite-loaded bacterial agent, 15-23 pts. wt. graphene, 3-10 pts. wt. biological complex enzymes, 28-39 pts. wt. inorganic flocculant, 20-35 pts. wt. flocculant, 20-25 pts. wt. sodium bisulfite, 12-15 pts. wt. coconut shell powder, and 12-20 pts. wt. sawdust. USE - Sewage treatment agent use in the treatment of river sewage and aquaculture wastewater (claimed). ADVANTAGE - The sewage treatment agent effectively remove most of heavy metals and complexation in sewage materials, organic matter, effectively reducing the nitrogen and phosphorus content in sewage, purifying water bodies, efficient and environmentally friendly, will not cause secondary pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a sewage treatment agent, which comprises: (A) using 32-40 pts. wt. hydrolyzed tannin, dissolving in 300-350 pts. wt. water, adjusting the pH to 7 with sodium hydroxide, and adding 15-20 pts. wt. chitosan after dissolution, reacting at room temperature for 1-2 hours, reaction at 50-55 degrees C for 1-6 hours, filtering and drying to obtain chitosan-cured tannins; (B) dissolving sodium chloride in a 50% ethanol aqueous solution, mixing the bentonite uniformly, and letting it stand for 30-60 min with a power of 2000-2500W under microwave irradiation for 0.5-2.5 min to obtain sodium-based bentonite; (C) taking 20-30 pts. wt. the sodium-based bentonite and add 180-250 pts. wt. the fungicide, adjusting the pH with sodium hydroxide or glacial acetic acid, and stirring at 35-45 degrees C for 1-1.5h at a constant temperature, and obtaining a sodium-based bentonite-loaded bacterial agent; (D) mixing the sawdust and coconut shell powder uniformly, adding flocculation aid, soaking for 1-2 hours, drying and grinding to obtain mixture a; and (E) irradiating with microwave at a power of 1000-1200W for 8-10s, it is added to the mixture a, then adding chitosan-cured tannin, sodium-based bentonite-loaded bacterial agent, graphene, organic-inorganic flocculant, and sodium bisulfite and mixing uniformly to prepare a sewage treatment agent.