SBBR-SBR (sequencing batch biofilm reactor-sequencing batch reactor) advanced nitrogen removal combined treatment process of landfill leachate

Abstract

The invention relates to the technical field of sewage treatment and particularly relates to a SBBR-SBR (sequencing batch biofilm reactor-sequencing batch reactor) advanced nitrogen removal combined treatment process of landfill leachate. The process comprises the following steps: enabling sewage to enter an SBBR, stirring the sewage, starting absorbing carbon sources with fillers and activated sludge to form internal carbon sources, throwing the activated sludge in the SBBR into an SBR2 for aeration nitrification, throwing the sludge after nitrification of an SBR1 is ended into the SBBR for endogenous denitrification with a large amount of internal carbon sources absorbed by biofilms in the fillers in the last stage, performing sedimentation and draining water after denitrification is ended, entering the next cycle and exchanging functions of the SBR1 and the SBR2. According to the treatment process, advanced nitrogen removal of the landfill leachate is achieved, and no carbon sourceis needed to be added; a large amount of internal carbon sources are absorbed by the biological fillers in the SBBR, so that the rate of the endogenous denitrification is high; the nitrification process is separated from the denitrification process, so that the internal carbon sources are not consumed in an aerobiotic stage, and the rate of denitrification is far higher than the rate of the traditional endogenous denitrification; the final total nitrogen in out of water of the SBBR is lower than 50mg / L and directly reaches the national emissions standard.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an SBBR-SBR deep denitrification combined treatment process for landfill leachate. Background technique [0002] Refractory nitrogen-containing organic wastewater including coking, chemical, petrochemical, printing and dyeing, papermaking, pharmaceuticals, pesticides, landfill leachate, etc. After secondary biochemical treatment, ammonia nitrogen and most of the organic matter can be effectively removed, but the wastewater still contains certain Concentrations of refractory organic matter, nitrate nitrogen, organic nitrogen and ammonia nitrogen, the biodegradability of the secondary biochemical effluent is extremely poor, and advanced treatment is required to meet the discharge and reuse requirements. Traditional landfill leachate denitrification technologies mainly include A / O process, oxidation ditch and SBR. Although the A / O process has a separate anoxic zone for den...

AI Technical Summary

Problems solved by technology

Although the A / O process has a separate anoxic zone for denitrification, the denitrification rate is relatively fast, but because it belongs to pre-denitrification, it is difficult to achieve a denitrification rate of more than 90%; the oxidation ditch process has no obvious nitrification zone and Denitrification area, so the nitrogen removal efficiency is not very high

The traditional SBR process generally adopts post-denitrification method to achieve deep denitrification of leachate, but it needs to add carbon source and the treatment cost is high

Images