Device and method for strengthening multistage A/O process biological nitrogen removal

Abstract

The invention provides a device and a method for strengthening multistage A / O process biological nitrogen removal, and belongs to the technical field of sewage treatment. The multistage A / O process is a three-stage A / O process, namely an anoxic zone A-I, an aerobic zone O-I-I, an aerobic zone O-I-II, an anoxic zone A-II, an aerobic zone O-II-I, an aerobic zone O-II-II, an anoxic zone A-III, an aerobic zone O-III-I and an aerobic zone O-III-II in sequence, and the volume ratio of each aerobic zone to each anoxic zone is (0.8-1): 1. Float glass balls are respectively filled in the A-I, O-I-II, A-II, O-II-II, A-III and the O-III-II; three-dimensional sponge fillers are respectively filled in the O-I-I, O-II-I and the O-III-I; the device is used for feeding water into the aerobic zones in three segments in parallel, and nitrification liquid flows back to the anoxic zone A-I from the aerobic zone O-III-II. The device and the method provided by the invention can be used for reducing the sludge, and meanwhile strengthening the SND phenomenon, improving the accumulation rate of nitrous oxide, saving a denitrification carbon source and improving the removal rate of total nitrogen.

Description

technical field [0001] The invention relates to a device and method for strengthening biological denitrification of multi-stage A / O process. The reactor is filled with different forms of biological carriers, which has the effect of strengthening biological denitrification and sludge reduction, and belongs to the technical field of sewage treatment. Background technique [0002] In recent years, with the rapid development of my country's urbanization, my country's water environment pollution and water eutrophication have become more and more serious. More and more seriously hinder the development of our national economy. Nitrogen is the main pollutant that causes eutrophication in water bodies, and it is particularly important to control the total nitrogen content in discharged sewage. For this reason, the country has introduced more stringent urban sewage treatment standards. "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) puts forward high...

AI Technical Summary

Problems solved by technology

[0009] 4. In the previous biofilm multi-stage A / O process, the multiple aerobic pools of the same stage generally did not refine the specific form of the filler and operating parameters, etc., which is actually not conducive to the accumulation of nitrous and SND phenomenon;

[0010] 5. Due to the fact that anoxic denitrification cannot remove all easily biodegradable COD in actual operation, the low internal dissolved oxygen in the drift ball at the front end of the aerobic pool will allow filamentous bacteria to grow to a certain extent and inhibit growth of ammonia oxidizing bacteria

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