Study on the process of sewage treatment with thickened sludge in sequencing batch reactor

摘要

The invention relates to a method for treating wastewater (20) including carbon pollution, nitrogen pollution and phosphorus pollution in a sequencing batch reactor (SBR), which comprises:An enclosure suitable for holding different levels of wastewater sludge mixture,A sludge bed, including Pao, is located at the bottom of the shell, above which the sludge curtain level is defined,A device for determining the minimum and maximum levels of sludge extraction in the enclosure,An extraction device capable of extracting sludge at different levels between the lowest and highest extraction levels,The process comprises:The step (101) of feeding to the SBR, in which the volume of wastewater to be treated (20) is introduced into the sludge bed, close to the bottom of the shell,A reaction sequence (102) comprising:At least one anaerobic first stage (103), in which polycyclic aromatic hydrocarbons capture carbon pollution and release phosphorus compounds,Alternatively, the second stage (104) anoxic denitrification,The third stage of aeration (105) allows OAP to remove phosphorus from wastewater,A sedimentation step (106) in which the sludge settles at the bottom of the shell and the contents of the shell are clarified near its surface,A recovery step (107) in which the clarified part in the shell is removed and the recovery step (107) and feeding step (101) are carried out at the same time, andA step of extracting at least a portion of the light sludge to a predetermined level (108).Summary figure: Figure 2