▎ 摘　　要

NOVELTY - Method for controlling release of cadmium during composting of domestic waste involves (a) collecting compost from domestic waste composting plant, crushing compost, and selecting graphene microchip and graphene oxide, (b) filling river sand, compost and graphene microchip or graphene oxide into leaching tube, (c) adding leaching solution containing sulfate, nitrite, chloride, calcium, potassium and sodium into leaching tube, and (d) maintaining tubes in a room, and determining concentration of heavy metal cadmium in leaching solution using atomic absorption spectrophotometer. USE - The method is useful for controlling release of cadmium during composting of domestic waste, and reducing cadmium leakage after artificial acid rain (all claimed). ADVANTAGE - The method improves dynamic fit degree of cadmium. DETAILED DESCRIPTION - Method for controlling release of cadmium during composting of domestic waste involves (a) collecting compost from domestic waste composting plant located in small lake town of Tianjin city, crushing compost using sieve of 2 mm size, selecting graphene microchip having size of 0.5-20 mu m, thickness of 5-25 nm, specific surface area of 40-60 m2/g, density of 2.25 g/cm3, conductivity of 8000-10000 S/m and carbon content of greater than or equal to 99.5 wt.%, selecting graphene oxide having 5-10 layers, thickness of 3.4-7 nm, diameter of 10-50 mu m, specific surface area of 100-300 m2/g and purity of greater than or equal to 90 wt.%, (b) filling 20 g river sand into bottom of leaching tube up to a height of 1-2 cm, and filling 150 g compost and 1 weight/weight% graphene microchip or graphene oxide at top of the leaching tube, where the leaching tube is PVC pipe having length of 25 cm and diameter of 3 cm, taking control group without carbon nanomaterials, adding graphene oxide, hydroxylated multiwalled carbon nanotubes and carboxylated multiwalled carbon nanotubes into 4 treatment groups, (c) adding leaching solution comprising 14.66 mg/l sulfate, 6.54 mg/l nitrite, 1.68 mg/l chloride, 3.71 mg/l ammonia, 0.82 mg/l magnesium, 1.38 mg/l calcium, 0.64 mg/l potassium and 0.78 mg/l sodium into leaching tube, adding rain water and adjusting pH of solution to 5.6 using hydrochloric acid, and (d) adding distilled water to the tube for 30 days, where moisture content of soil in tube is the water-holding capacity of soil, maintaining tubes at 18-25 degrees C and humidity of 35-65% in a room for 30 days, collecting 10 ml of leaching solution from bottom of the tube until cumulative leaching solution reaches 100 ml, recording time and determining concentration of heavy metal cadmium in leaching solution using atomic absorption spectrophotometer.