Removal method and equipment for sucking ammonia nitrogen in waste water through negative pressure of vacuum

Abstract

This invention provides method and equipment for removing NH3-N from wastewater by vacuum pumping. The equipment comprises a vacuum denitrification tank, a rotational gas absorption tank or a Venturi gas absorption column, and a vacuum pumping system. At least one water flow clapboard is set in the vacuum denitrification tank and the rotational gas adsorption tank, respectively. Besides, a vacuum pumping orifice and a gas-discharging valve are set on the top of the two tank, a water-entering valve and a water-discharging valve are set along both sides of the lower parts, a liquid-emptying valve is set is at the bottom, and a NH3-N concentration sensor and an adjustable autocontroller are set on the bodies. The method and equipment have such advantages as low operation cost and no secondary pollution.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a vacuum negative pressure suction removal method and equipment for ammonia nitrogen in wastewater. Background technique [0002] Today, the global water pollution situation is increasing day by day, and the eutrophication phenomenon of water body is getting worse and worse. The important reason for the eutrophication of the water body is that domestic and industrial wastewater convert a large amount of NH 3 -N is discharged into the water body. [0003] In domestic wastewater and industrial wastewater, if NH 3 - Low concentration of N (generally less than 200mg / L), can be processed by cheap biological treatment methods. However, in many cases, NH in industrial wastewater 3 -N exceeds 1000mg / L, which contains high concentration of NH 3 -N wastewater will inhibit the growth of microorganisms, so it is not suitable to be directly treated by cheap biological treatment methods, bu...

AI Technical Summary

Problems solved by technology

Although their denitrification efficiency can be very high (for example, when pH=10.8, temperature 255°C, and pressure 4.2MPa, 1023mg / L ammonia nitrogen wastewater is treated, NH 3 -N removal rate can reach 98%), however, in general, expensive noble metal catalysts are required, and there are high requirements for corrosion resistance and high temperature and pressure resistance for reactors and pump equipment, so it is not possible to become widely used for the time being Ammonia removal method

[0024] In summary, the existing de-NH 3 Among the industrial water treatment technologies for -N, some of them consume a lot of chemicals or energy, and some are only suitable for dealing with low concentration or small-scale NH 3 -N wastewater treatment, although some except NH 3 -N has high efficiency, but the equipment is complicated and expensive

At present, only biological treatment technology can treat NH 3 Inexpensive and large-scale treatment of -N wastewater, but under the current technical conditions, even the most advanced anaerobic biological denitrification process, the upper limit of ammonia nitrogen treatment can only reach 1000mg / L, and the efficiency is only about 50%

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