Parameter optimization of rural sewage treatment type household manholes based on waste brick

Abstract

The amount of rural sewage varies greatly, which easily affects the normal operation of sewage treatment facilities. The application of waste bricks to construct rural sewage treatment type household manholes can realize front pollution control, improve the stability of the rural sewage treatment system, and realize the resource utilization of rural construction wastes, which has a broad prospect. However, the influencing factors and parameter selection of this technology are not clear, which affects its popularization and application. To solve the above problems,this study adopted small and pilot devices, combined with material characterization, single factor analysis and response surface analysis to study the influence of waste brick particle size, pollution control effect and parameter optimization process of waste brick-based rural sewage treatment type household manholes. It was found that waste brick-based rural sewage treatment type household manholes had good sewage treatment effects, and waste brick fragments with particle size of 0.5-<1.0 cm were more suitable. Filling height, baffling depth and drop height had influences on the pollution control effect of household manholes. With the increase of filling height and baffling depth, and the decrease of drop height, the removal rate of pollutants increased. Under the optimal conditions of household manholes, the removal rates of chemical oxygen demand, suspended matter, ammonia nitrogen, total nitrogen and total phosphorus reached 58%, 68%, 60%, 52% and 58%, respectively. The filling height of 90 cm, the baffling depth of 64 cm, and the drop height of 12 cm were desirable for the in-site reuse scenario. This study could provide a feasible technical solution for the pollution control of rural sewage and a reference for rural sewage treatment technology.

Keywords

• rural sewage
• household manholes
• waste brick
• pollution control
• response surface