Culture method of aerobic nitrosification granule sludge

Abstract

The invention discloses a culture method of municipal sewage nitrosification granule sludge, belonging to the field of restoration and regeneration of an aquatic environment. The invention aims to solve the problems of low carbon-nitrogen ratio, low denitrification efficiency and waste of abundant energy sources in the municipal sewage. The method comprises steps: anaerobic ammoxidation granule sludge is inoculated in an SBR (sequencing batch reactor); by using domestic sewage as raw water, the dissolved oxygen in the reactor is controlled at 4 mg / L or more, the stirring speed is controlled at 100 r / min, the temperature is controlled at 30 DEG C, the hydraulic retention time is controlled at 8 hours, and the sedimentation time is controlled at 5 minutes; the aerobic ammoxidation bacterium AOB and denitrifying bacterium can form granule sludge with anaerobic ammoxidation granule sludge as core; the shearing force generated by aeration can provide selection pressure for the formation of the granule sludge and promote the formation of the granule sludge; and the short sedimentation time is beneficial to elimination of nitrobacteria, thereby keeping the nitrosification stable. By using the method, the ammonia nitrogen removal ratio is up to 100%, and the nitrogen accumulation rate is higher than 95%.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a method for cultivating domestic sewage nitrosation 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. Nitrite-based biological denitrification technology has the advantages of reducing energy consumption, saving carbon sources, and reducing sludge generation. However, the growth rate of aerobic ammonia oxidizing bacteria is slow, the cell yield is low, and they are sensitive to environmental changes, resulting in long enrichment and acclimation time for dominant bacteria, low treatment efficiency, and high requirements for the bioretention capacity of the reactor. Many researchers use low dissolved oxygen strategy to inhibit the growth of nitric acid bacteria, but this strat...

AI Technical Summary

Problems solved by technology

However, the growth rate of aerobic ammonia oxidizing bacteria is slow, the cell yield is low, and they are sensitive to environmental changes, resulting in long enrichment and domestication of dominant bacteria, low treatment efficiency, and high requirements for the bioretention capacity of the reactor.

Many researchers use low dissolved oxygen strategy to inhibit the growth of nitric acid bacteria, but this strategy makes the oxidation effect of ammonia nitrogen very low, which makes the nitrification rate low. Nitrosification is controlled by the inhibition of nitrosation, the concentration of ammonia nitrogen in the effluent is still at a relatively high concentration, and nitrosating bacteria are adaptable to free ammonia, and the effect of nitrosation is difficult to maintain stably

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