Study On The Greywater Treatment Technology Of Semi-centralized Treatment System

Traditional drainage system is the pipe-end treatment mode, in which water and substance flow linearly, resource recovery of waste hard to realize, does not accord with requirements of sustainable development and circular economy. New concept of "Semi-centralized Treatment System", which can realize water, nutrition and energy circle through separate water supply and separate discharge system was presented in this paper. In the research Integrated Moving Bed Biofilm Reactor (IMBBR) was designed as the greywater treatment technology. Survey on Residents waste drainage status and water quality of greywater, blackwater, shower wastewater, kitchen wastewater offered firsthand datum for the development of greywater treatment technology. Bench-scale experiments and IMBBR small-scale continuous flow experiments were designed to study the removal efficiency for COD_Cr, NH₃-N and LAS in greywater, optimized the process parameters and gave the technical proposal of greywater treatment base on IMBBR process.In the survey, it was shown that residents in Shanghai highly accepted the seperate water supply and seperate discharge system as well as reclaimed water. Also, water qualities of greywater, blackwater, shower wastewater, kitchen wastewater were given after several continuous months' investigation.Lab bench-scale experiments showed that PAC, PFS as coagulation and PAM as the coagulant aid pre-treat greywater had a high removal efficiency of COD_Cr, LAS and turbidity. Removal quantity of LAS was in proportion with coagulant dosage. PAC and PAM combined to coagulate greywater was the most economical choice. MBBR treat medium LAS concentration greywater and high COD_cr .low LAS concentration graywater to meet the Urban Reused Water Standard need 3-4 hours and 5-7 hours respectively.Research on small-scale continuous flow showed that IMBBR had good removal capacity of COD_Cr, NH₃-N and turbidity in low-medium municipal wastewater, and the effluent of IMBBR can meet the the Urban Reused Water Standards. Turbidity of effluent of IMBBR is lower than 5NTU at the condition of the surface load of suspended carrier solid-liquid separation section between 1.41m³/m²h-1.92m³/m²h,...