Device for treating rare earth producing ammonia nitrogen wastewater through combination of microwave and supergravity and application method

Abstract

The invention relates to a device for treating rare earth producing ammonia nitrogen wastewater through combination of microwave and supergravity and an application method, and belongs to the technical field of ammonia nitrogen wastewater treatment. In the device, the bottom of a wastewater tank is communicated with a liquid inlet of a microwave oven through a liquid conveying pump and a liquid conveying pipe; a heated liquid outlet in the bottom of the microwave oven is communicated with a water spraying pipe arranged at the middle position of the side part of a supergravity rotating packed bed through a liquid conveying pump and a liquid conveying pipe; rotating plates are arranged inside the supergravity rotating packed bed; the rotating plates are connected with a motor through a rotating shaft; mesh belts are arranged between the rotating plates; a gas outlet is formed in the top of the supergravity rotating packed bed, a liquid outlet is formed in the bottom of the supergravity rotating packed bed, and an air inlet is formed in the bottom of the side part of the supergravity rotating packed bed; the gas outlet is connected with a waste gas absorbing bottle through a gas outlet pipe; the liquid outlet is connected with an absorbing liquid tank through a liquid outlet pipe; the air inlet is connected with a blower through an air inlet pipe. In order to better improve the blow-off rate and reduce the energy consumption, an ammonia nitrogen wastewater solution is heated by taking the advantage of rapid microwave heating, and the characteristic of a supergravity enhanced transfer effect is utilized.

Description

technical field [0001] The invention relates to a microwave-high gravity combined treatment device and application method for ammonia nitrogen wastewater produced by rare earth, belonging to the technical field of ammonia nitrogen wastewater treatment. Background technique [0002] Rare earth ammonia nitrogen wastewater is a kind of industrial wastewater with large water volume, complex composition, high hardness, high ammonia nitrogen content, high pollution, and difficult treatment. A large amount of ammonia nitrogen wastewater is directly discharged, and entering the water body can cause eutrophication of the water body, leading to deterioration of water quality, and its discharge subject to strict restrictions. There are two main types of ammonia nitrogen wastewater produced in the rare earth smelting process: ① Ammonium sulfate wastewater: mainly from the production of rare earth carbonate and rare earth separation ammonia saponification process, the main pollutant is a...

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Problems solved by technology

[0003] At present, there are many methods for treating high-concentration ammonia nitrogen in rare earth wastewater, such as evaporation concentration method, break point chlorination method, electrodialysis method, chemical precipitation method, ion exchange method, biological treatment method, alkaline ammonia distillation method (air stripping method and steam stripping method), etc., but there are certain disadvantages, such as the high cost of ammonia distillation concentration method, low-concentration wastewater needs to be concentrated first, and product sales are difficult; the breakpoint chlorination method is effective in treating low-concentration ammonia nitrogen wastewater, but it must prevent secondary Secondary pollution; although the membrane method is effective in recovering ammonia nitrogen wastewater, the operating cost is high and the treatment capacity is limited; the cost of chemical precipitation phosphate is relatively high, so these methods are still in the research stage

The air stripping method is a relatively simple and widely used method. Generally, two types of equipment, the stripping tank and the stripping tower, are used, which have a large footprint, low separation efficiency, and are likely to cause secondary pollution.

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