IMPROVEMENT AND ECONOMIC BENEFIT ANALYSIS OF A TYPICAL TREATMENT PROCESS FOR DECORATION WASTE

Decoration waste has the characteristics of multiple and complex components and large fluctuation of waste properties. The treatment process should be determined by on-site diligence in the waste source area. Taking a typical decoration waste project in Shanghai as an example, its process route is "two-stage crushing+multi-stage sorting", and there is a significant difference between the actual and the designed material balance after the primary screening unit. The utilization rate of the back-end sorting equipment was at a low level. The practical process improvement measures included material diversion or adjusting the upper sieve plate specification. After the improvement, the proportion of the actual receiving and processing load of the three box-type air separators with the same specification was close, and the material distribution uniformity tended to be reasonable. In terms of economic benefits, the operation cost of the treatment line was converted to about 114.49 yuan/t, of which the labour cost, residue incineration disposal cost and residue landfill disposal cost accounted for 20.69%, 19.22% and 14.11% respectively; the operating income was about 26.45 yuan/t, mainly from the sale of recycled brick products and recycled aggregates. The operation cost and product quality of brick making line were significantly affected by the cement mixing ratio. When the cement mixing ratio increased from 10% to 20%, the average compressive strength of recycled standard bricks increased from 13.9 MPa to 18.1 MPa; when the optimum cement mixing ratio was 15%, it was difficult for the brick making line to maintain the balance of revenue and expenditure. The decoration waste project had low investment income and economic benefit without government support, which is the main bottleneck of the industry development in this field.