A method for cultivating fully autotrophic denitrification granular sludge in a continuous flow reactor

Abstract

The invention discloses a method for culturing full autotrophic denitrification granular sludge in a continuous flow reactor, and belongs to the field of wastewater autotrophic denitrification. The method comprises the following steps of: firstly, inoculating a CANON biological membrane in the continuous flow reactor; directly beginning to carry out a full autotrophic denitrification process under an oxygen limitation condition to culture the full autotrophic denitrification granular sludge. The full autotrophic denitrification granular sludge process is started under a low-load condition at first, and then the inoculated sludge continuously adapts to the reaction condition in the continuous flow reactor, so that the processing ability of the continuous flow reactor is continuously improved; in a high-load culturing stage, the water inflowing load is improved by utilizing means of keeping the ammonia-nitrogen concentration of inflowing water invariable and shortening hydraulic retention time to continuously culture granular sludge. Because strong flow shear stress acts upon the continuous flow reactor, the granulation process of the full autotrophic denitrification sludge is promoted, and the structure of the granular sludge formed in the continuous flow reactor is relatively stable.

Description

technical field [0001] The invention belongs to the field of autotrophic denitrification of waste water. In particular, it relates to a method for cultivating whole-process autotrophic denitrification granular sludge in a continuous flow reactor. It is suitable for the treatment of sewage with high ammonia nitrogen and low carbon nitrogen ratio. Background technique [0002] Third et al. proposed the CANON (completely autotrophic nitrogen removal over nitrite) process in 1999, which is a single-stage full autotrophic nitrogen removal process. Compared with the traditional full-process nitrification and denitrification process, this process is based on the principle of short-range nitrification and anammox reaction, which has the advantages of short process flow, small footprint, and low infrastructure investment; it saves oxygen consumption and reduces carbon emissions; the residual pollution Less mud; no need to add carbon source and many other advantages. This process c...

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Problems solved by technology

However, due to the slow growth rate of AOB and AnAOB (the doubling time of AnAOB is as long as 11 days), and the strict control method for forming granular sludge, it is very difficult to cultivate the whole process of autotrophic denitrification granular sludge

At present, many researchers use sequencing batch reactors to cultivate the whole process of autotrophic denitrification granular sludge, but because the sequencing batch reactor needs water inflow, reaction, precipitation, water outlet, idle and other stages, the operation and management are complicated, and the reactor There is no longitudinal water shear force inside, which is not conducive to the formation of granular sludge

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