Denitrification process of waste water

Abstract

The invention relates to a denitrification process of waste water. The denitrification process comprises the following steps: online monitoring is performed on pH value of the waste water in an aerobic pool by a pH meter in the pool, and the pH value is controlled at the range of 7.4-8.3; and the online monitoring is performed on dissolved oxygen concentration of the waste water in the pool by an online dissolved oxygen analyzer in the aerobic pool, and then rotating speed of a blower is adjusted by a frequency converter so as to adjust aeration rate, thus controlling the dissolved oxygen concentration at 0.5mg / L-1mg / L. The denitrification process has the following advantages: saving energy: oxygen supply can be lowered by about 25% in the nitrification process, thus reducing energy consumption; reducing external carbon source: 40% of organic carbon source can be reduced in the denitrification process; and being capable of reducing excess sludge production amount: 24%-33% of the sludge to be produced can be reduced in the short-cut nitrification process and 50% of the sludge to be produced can be reduced in the denitrification process.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a waste water denitrification treatment process. Background technique [0002] The A / O denitrification process is a process developed in the early 1980s. After pretreatment and primary treatment, the wastewater first enters the A pool, which is the anoxic pool, and uses ammonifying bacteria to convert the organic nitrogen in the wastewater into NH 3 -N, and NH in raw wastewater 3 -N into the aerobic pool together. In the O pool, that is, the aerobic pool, in addition to oxidizing carbon-containing organic matter as in the conventional activated sludge process, under suitable conditions, nitrosifying bacteria and nitrifying bacteria are used to convert NH 3 -N nitrification to NO x - -N. In order to achieve the purpose of wastewater denitrification, the nitrification mixture in the aerobic tank flows back to the anoxic tank through internal circulation, and uses the organic...

AI Technical Summary

Problems solved by technology

[0008] (3) Nitrite still has the ability to consume oxygen and will continue to consume dissolved oxygen (DO) in the water;

[0009] (4) Nitrite bacteria and nitric acid bacteria are ubiquitous, and it is difficult to separate them strictly in engineering;

[0010] (5) Since the nitrification process proceeds to the nitrate stage, the denitrification process can only use nitrate as the substrate for the whole process of denitrification

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