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Combined treatment process for high-concentration ammonia nitrogen waste water

The technology of ammonia nitrogen wastewater and treatment method is applied in the treatment field of high-concentration ammonia nitrogen wastewater, which can solve the problems of complex operation, low ammonia nitrogen load and high ammonia nitrogen wastewater treatment cost, and achieves low energy consumption, high ammonia nitrogen load capacity and easy control of reaction conditions. Effect

Inactive Publication Date: 2007-11-07
SHANGHAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a combined treatment method for high-concentration ammonia-nitrogen wastewater with low energy consumption in order to overcome the many shortcomings of high-concentration ammonia-nitrogen wastewater treatment cost, complicated operation, and low ammonia nitrogen load.

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  • Combined treatment process for high-concentration ammonia nitrogen waste water

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Embodiment 1

[0016] Embodiment one: first add 320g quicklime CaO to 25L waste water containing ammonia nitrogen 6500mg / L in the adjustment tank, and the pH value of waste water recorded at this time is adjusted to 12; then the waste water is passed into the stripping tower; the top of the stripping tower A sprinkler is installed, and a Raschig ring is arranged in the tower body; the waste water forms a thin liquid flow through the sprinkler and flows through the Raschig ring arranged in a zigzag path; at the same time, air is blown into the aeration port at the bottom of the tower to make the Raschig ring The surface is in contact with the gas-liquid phase; then the eluted tail gas enters the absorption pool filled with waste hydrochloric acid or waste sulfuric acid to absorb part of the ammonia nitrogen. The concentration of ammonia nitrogen in the stripped water measured at this time is 2300 mg / L, and the removal rate of ammonia nitrogen is about 65%.

[0017] Then, the effluent of the a...

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Abstract

The combined treatment process of high concentration ammonia nitrogen waste water belongs to the field of waste water treating technology. The combined treatment process of high concentration ammonia nitrogen waste water features the combination of blow-off method, MAP method and nitrosation-anaerobic ammoxidation biological method. The treating process of the present invention includes the steps of: adding lime into the waste water in a regulating tank to reach pH of 11-12; blow-off and aerating in a blow-off tank, with the blow-off tail gas entering to an absorbing tank and the blow-off water entering to a MAP reaction tank; treating the blow-off effluent in the MAP reaction tank with thrown disodium hydrogen phosphate and magnesia to produce magnesium ammonium phosphate precipitate exhausted; and the final nitrosation-anaerobic ammoxidation biological treatment. The process has low power consumption and other advantages.

Description

technical field [0001] The invention relates to a treatment method for high-concentration ammonia nitrogen wastewater, which belongs to the technical field of environmental engineering wastewater treatment. Background technique [0002] High-concentration ammonia nitrogen wastewater (ammonia nitrogen concentration above 2000mg / L) mainly comes from coking, oil refining, meat processing, feed production, chemical fertilizer and other industrial production processes, as well as animal husbandry wastewater, landfill leachate, etc. Discharge of high ammonia nitrogen wastewater into the receiving water body will lead to black and odorous water quality, cause eutrophication of the water body, and reduce the ornamental value of the water body; when ammonia and organic matter exist in the water, after chlorine is added, highly toxic by-products of cyanogen chloride will be produced; high concentrations of ammonia nitrogen will consume the water body The dissolved oxygen in the water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/66C02F1/58C02F3/28
Inventor 郑乐平刘小燕沈彩虹陈翠霞
Owner SHANGHAI UNIV
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