Single-stage aerobic biological denitrification operation method of sequencing batch reactor

Abstract

The invention relates to an operation method of single-stage aerobic biological nitrogen loss in a sequencing batch reactor, which is used for the treatment of waste water containing ammonia nitrogen. The method adopts the general sequencing batch reactor and includes the steps that sewage first enters the SBR and aerobic aeration is conducted directly to the sewage; the concentration of the dissolved oxygen in the SBR is 6mg / L at the beginning of the aerobic aeration and the pH value is adjusted to be 7 by NaHCO3 and 0.5 M HCl; the aerobic aeration lasts for 4h and then is completed; the solution is settled for about 0.5h then; water is discharged next and the water power staying time in the reactor is about 12h; sludge is discharged to stabilize the sludge concentration which is about 4000mg / L in the reactor and control the sludge age which is about 10d; finally the reactor is kept still for about 9.5h. By adopting the single-stage aerobic technique, the method realizes the biological nitrogen loss and adjusts the pH value to restrain the growth of nitrifying bacteria and realizes the synchronous removal of organism and nitrogen by direct oxidation, thus reducing the infrastructure and operating costs of the nitrogen-contained sewage treatment.

Description

technical field [0001] The invention relates to a method for treating ammonia-nitrogen-containing wastewater by using microorganisms to absorb nitrogen in excess, and belongs to the technical field of sewage treatment in environmental protection. technical background [0002] With the rapid development of my country's social economy and the continuous improvement of industrialization and urbanization, the shortage of water resources and water pollution in my country have become increasingly prominent, seriously affecting the quality of life and health of the people, and restricting the sustainability of my country's society, economy and environment. Coordinated development. Nitrogen is one of the main environmental pollution factors. Nitrogen from domestic sewage, agricultural nitrogen fertilizers and some industrial wastewater enters rivers and lakes, causing eutrophication of water bodies, which brings huge losses to industrial and agricultural production, and nitrate nitr...

AI Technical Summary

Problems solved by technology

In order to achieve a good biological denitrification effect, an aerobic / anoxic alternating environment suitable for the growth of nitrifying bacteria and denitrifying bacteria needs to be set up in the reaction system. Oxygen increases power consumption and operating costs; in order to maintain a high biological concentration and obtain a good denitrification effect, the system must simultaneously return sludge and nitrifying liquid, which increases power consumption and operating costs; for C / N (carbon / Nitrogen) ratio of low waste water, need to input additional organic carbon source, every gram of NO 3 -N denitrification to N 2 At the same time, the heterotrophic denitrifying bacteria need to consume 3.5-4.5gCOD (chemical oxygen demand), which increases the operating cost; in order to neutralize the alkalinity generated in the nitrification process, it needs to add alkali to neutralize the processing cost; the process is longer , large area, high infrastructure investment

Although there are many research reports on biological denitrification of wastewater at home and abroad, most of them are based on the improvement of biological denitrification process on the basis of traditional nitrification / denitrification biological denitrification.

So far, no literature reports have been found at home and abroad on the use of microorganisms to absorb excess nitrogen to achieve biological denitrification

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