An improved a2/o process for continuous-flow short-path nitrification and denitrification phosphorus removal

Abstract

The invention relates to an improved A2 / O process of continuously shortcut nitrifying and denitrifying dephosphatation, and belongs to the field of sewage treatment and recycling. According to the improved A2 / O process, a fiber elastic filler is added to an aerobic section, and the high-sludge age shortcut nitrifying and denitrifying dephosphatation is realized in an improved A2 / O reactor additionally provided with an intermittent aeration section; the traditional process is improved, the aerobic section is divided into an aerobic section 1 and an aerobic section 2 along a water flow direction, the intermittent aeration section is arranged at the rear of the aerobic section 2, periodical short-time aeration is controlled by virtue of an electronic timer, a sludge reflux device is arranged at the bottom of the electronic timer, sludge is discharged during the intermittent aeration of a water overflow weir positioned at the top of the electronic timer and flows into a sedimentation tank for precipitation and discharge, and the sludge reflex of the sedimentation tank is canceled. The improved A2 / O process disclosed by the invention can be used for controlling low aeration, intensifying the activity of refluxed sludge by virtue of the effects of advanced treatment, sludge screening, inhibition release and the like of the intermittent aeration section, enhancing the sludge concentration of a system and prolonging the sludge age, can be used for gathering the ammonia oxidizing bacteria and the denitrifying phosphorus removing bacteria into the system and successfully realizing the shortcut nitrifying and denitrifying dephosphatation of the stable continuous flow A2 / O process.

Description

Technical field [0001] The invention belongs to the field of urban sewage treatment and regeneration. Specifically, it relates to the improvement of simultaneous removal of nitrogen and phosphorus by a short-cut nitrification and denitrification method dedicated to wastewater with a low C / N(P) ratio. 2 / O process. Background technique [0002] With population growth and rapid economic development, water pollution has become more and more serious, especially the eutrophication hazards caused by nitrogen and phosphorus are the most prominent, which has a great impact on natural ecology and human health. At present, sewage plants mostly adopt simultaneous biological nitrogen and phosphorus removal processes based on nitrification and denitrification and phosphorus uptake by phosphorus-accumulating bacteria, or supplemented by chemical phosphorus removal, such as anaerobic-anoxic-aerobic (A 2 / O), oxidation ditch process, etc. [0003] A 2 The / O method is a classic process for biolog...

AI Technical Summary

Problems solved by technology

However, this process has two shortcomings: one is the contradiction between the sludge age between nitrifying bacteria and PAO; the other is the competition between denitrifying bacteria and PAO for carbon source

The C / N ratio of urban sewage in my country is generally low, which makes the contradiction of the process more prominent, and it is difficult to meet the standards of N and P in the effluent at the same time

To improve A 2 / O process nitrogen and phosphorus removal efficiency, there are a variety of A 2 Improvement of / O process, such as suspension filler A 2 / O, Modified UCT (MUCT), Pre-hypoxic A 2 / O (A-A 2 / O), etc., but the overall removal efficiency of N and P is still low

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