Method for synchronously culturing nitrosified, anammox and denitrified granule sludge

Abstract

The invention provides a method for synchronously culturing nitrosified, anammox and denitrified granule sludge and belongs to the field of water environment recovery and regeneration, and the method is used for solving the problems of low carbon-nitrogen ratio, low denitrification efficiency and massive energy waste of urban sewage. The method comprises the following steps: grafting anammox granule sludge in an SBR (sequencing batch reactor) by using domestic sewage as raw water, controlling the dissolved oxygen in the reactor to be over 4mg / l, the stirring speed to be 100r / min, temperature to be 30 DEG C, circulating cycle to be 8 hours and precipitating time to be 3 minutes to culture high-efficiency nitrosified granule sludge; re-grafting the anammox granule sludge, maintaining the dissolved oxygen in the reactor to be 0-1mg / l, the circulating cycle to be 9 hours, precipitating time to be 6 minutes and other conditions to be constant. According to the method, granule sludge with nitrosified, anammox and denitrified functions can be cultured after a period, the ammonium-nitrogen removal rate of the system is over 90 percent, the total nitrogen removal rate is over 80 percent, and the total nitrogen removal volumetric loading is 0.12kg / (m<3>.d).

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a method for cultivating domestic sewage synchronous nitrosation, anaerobic ammonium oxidation and denitrification granular sludge. Background technique [0002] The traditional biological denitrification of urban domestic sewage adopts nitrification and denitrification process, which has the problems of insufficient carbon source and large aeration consumption. Anaerobic ammonia oxidation biological denitrification technology has the advantages of reducing energy consumption, saving carbon sources, and reducing sludge generation. The simultaneous nitrification, anammox, and denitrification process (SNAD) can achieve the removal of ammonia nitrogen and COD in one reactor. However, aerobic ammonium oxidizing bacteria (AOB) and anammox (anammox) bacteria have slow growth rate, low cell yield, and are sensitive to environmental changes, resulting in long enrichment and acclim...

AI Technical Summary

Problems solved by technology

However, aerobic ammonium oxidizing bacteria (AOB) and anammox (anammox) bacteria have slow growth rate, low cell yield, and are sensitive to environmental changes, resulting in long enrichment and acclimation time for dominant bacteria, low treatment efficiency, and bioretention of reactors. high ability requirements

At present, the research on the SNAD process focuses on high-concentration landfill leachate and sludge dewatering liquid, and there are few studies on low-concentration ammonia nitrogen sewage.

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