Ammonia-nitrogen removing method for treating high-concentration ammonia-nitrogen waste water

Abstract

Provided is an ammonia-nitrogen removing method for treating high-concentration ammonia-nitrogen waste water. The method comprises the steps that two phases are adopted to conduct treatment on the ammonia-nitrogen waste water; for the first phase, namely, a physico-chemical pretreatment phase, the concentration of the high-concentration ammonia-nitrogen waste water is reduced through an ultrasonic stripping method, wherein the water temperature is 65+ / -6 DEG C, and the time is 120+ / -20 min; the concentration requirement of a biological denitrification method to the ammonia-nitrogen waste water is met; for the second phase, residual ammonia and nitrogen in the waste water are removed through a denitrification and nitration biological denitrification method. Due to the fact that ultrasound has the advantages of increasing and controlling the chemical reaction velocity, increasing the yield of reactants and the like, for the ultrasonic stripping method, on the basis of a traditional air stripping method, an ultrasonic degradation technology is combined with a stripping technology, and a novel efficient high-concentration ammonia-nitrogen waste water treatment technology is derived. The ammonia-nitrogen removing rate can reach 90 percent, and limitation of the ammonia-nitrogen waste water concentration in a traditional technology is made up.

Description

Technical field [0001] The invention relates to an ammonia nitrogen wastewater treatment method, in particular a combination of an ultrasonic stripping method and a biological denitrification method, which reduces the limitation of the concentration of ammonia nitrogen wastewater treatment and improves the ammonia nitrogen removal efficiency. Background technique [0002] The traditional biological denitrification method is currently the most widely used ammonia nitrogen wastewater treatment method, which is mainly used to treat medium and low concentration ammonia nitrogen wastewater. Generally, the process of microbial removal of ammonia nitrogen in water is divided into three stages: ammoniation stage, nitrification stage and denitrification stage. The basic process is: [0003] Nitrogen-containing organic matter → ammonia nitrogen (ammonification) → nitrite nitrogen (nitrification) → nitrate nitrogen (nitrification) → nitrite nitrogen (denitrification) → nitrogen [0004] In the...

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Problems solved by technology

The traditional biological denitrification method is mainly used in the treatment of low-concentration ammonia-nitrogen wastewater. For the treatment of high-concentration ammonia-nitrogen wastewater with a concentration greater than 500 mg / L, the traditional biological denitrification method has the disadvantages of free ammonia inhibiting microbial activity and increasing oxygen supply. However, although the most widely used air stripping method in the physical and chemical denitrification method can treat high-concentration ammonia nitrogen wastewater, it has the problem of low ammonia nitrogen removal efficiency.

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