Short-range nitrification-denitrification dephosphorization and denitrogenation method for reinforced low-carbon/phosphorus-ratio sewage
A technology of denitrification dephosphorization and short-cut nitrification, which is applied in the field of wastewater treatment, can solve the problems of high infrastructure operation cost, complex system operation, and difficulty in handling, and achieve the purpose of strengthening the performance of short-cut nitrification denitrification and dephosphorization, and saving aeration and carbon source and reduce the floor area
Inactive Publication Date: 2012-11-07
CHINA UNIV OF MINING & TECH
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[0006] The purpose of the present invention is to provide a short-range nitrification and denitrification method for denitrification and denitrification of sewage with a low carbon-to-phosphorus ratio, so as to solve the reflux of various sludges and mixed solutions in the exi
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[0018] Example 1: The phosphorus and nitrogen removal method is: constructing a suspension-attachment coupled SBR short-range nitrification and denitrification phosphorus removal one-stage SBR, to realize the coexistence of two different functional bacteria, nitrifying bacteria and phosphorus accumulating bacteria, in the same reactor. Phosphate removal bacteria have different requirements on growth environment and sludge age. One-stage SBR is divided into upper and lower parts. The upper part has built-in biofilm filler for the growth of aerobic nitrifying bacteria, and the lower part is suspended growth of phosphorus accumulating bacteria, and the sludge age can be Separate control, thus creating an environmental condition in which nitrifying bacteria and phosphorus removing bacteria with different sludge age requirements coexist in the same SBR reactor;
[0019] The specific operation method is:
[0020] (1) Sewage first enters the suspension-attachment bioreactor from the ...
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The invention relates to a short-range nitrification-denitrification dephosphorization and denitrogenation method for reinforced low-carbon/phosphorus-ratio sewage, belonging to a wastewater treatment method. The method comprises the following steps: adding sewage to be treated into a reactor, and carrying out anaerobic phosphorus-release and carbon source absorption reaction with microbes which are grown on the bottom in a suspended mode; after the anaerobic phosphorus-release finishes, refluxing the upper mixed solution to a lower suspension growth region, and elevating the ammonia-nitrogen-enriched mixed solution subjected to anaerobic phosphorus-release to an upper attached growth region; aerating the microbes in the attached growth region to enable short-range nitrification of aerobic nitrobacteria; after the aerobic nitrification finishes, circulating the upper nitrification solution to a lower suspension sludge region to carry out anoxic denitrification phosphorus-adsorption reaction; and after the anoxic denitrification phosphorus-adsorption reaction finishes, discharging a certain amount of phosphorus-enriched sludge by an emptying valve/sludge valve. The invention solves the contradiction between the competition of nitrite bacteria and polyphosphate accumulating bacteria for the sludge age and the competition of polyphosphate accumulating bacteria and denitrifying bacteria for the carbon source, has stable and efficient short-range nitrification-denitrification dephosphorization efficacy, saves the aeration and carbon source, and is suitable for denitrogenation and dephosphorization treatment of low-C/P-ratio sewage.
Description
technical field [0001] The invention relates to a waste water treatment method, in particular to a short-range nitrification and denitrification method for strengthening low-carbon-phosphorus-ratio sewage to remove phosphorus and nitrogen. Background technique [0002] Eutrophication of water body is a global environmental problem, which is caused by overgrowth of algae caused by excessive nitrogen and phosphorus content in water body. In order to further reduce the harm caused by nitrogen and phosphorus to the water environment, many countries and regions have enacted new discharge standards for nitrogen, phosphorus and other indicators in sewage. For example, the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) promulgated by our country clearly stipulates stricter TP, NH 3 -The emission standards of N and TN are respectively: TP≤0.5mg / L, NH 3 -N≤5mg / L, TN≤15mg / L (Class A standard). At present, most of the secondary sewage treatment plant...
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Inventor 张传义张雁秋袁丽梅李燕厉魏张莎莎高丽慧
Owner CHINA UNIV OF MINING & TECH
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