A method for recovering ammonia from high ammonia nitrogen wastewater

Abstract

The invention discloses an ammonia recovery method of high-ammonia-and-nitrogen waste water, and belongs to the technical field of sewage treatment. The ammonia recovery method comprises the steps: firstly, the high-ammonia-and-nitrogen waste water passes through a decarburization tower where carbon-dioxide-containing steam and ammonia-containing steam are introduced, and calcium and magnesium ions in the waste water are removed; then the high-ammonia-and-nitrogen waste water passes through a deamination tower, steam-stripping deamination is carried out at 80-90 DEG C, ammonia and nitrogen inthe waste water enter a steam phase, high-concentration ammonia-containing mixed steam is formed and collected at the top of the deamination tower, one part of the ammonia-containing mixed steam flowsback to the decarburization tower, and the remaining part of ammonia-containing mixed steam is introduced into a condenser to be condensed and then subjected to gas-liquid separation; and finally, effluent of the deamination tower enters a subsequent treatment facility to be subjected to biochemical treatment, separated ammonia water enters a carburization tower where the carbon-dioxide-containing steam is introduced, and ammonium bicarbonate is formed and serves as a recycled product. By adopting the method for high-ammonia-and-nitrogen waste water treatment and ammonia recovery, the deamination effect and ammonia recovery efficiency of the high-ammonia-and-nitrogen waste water can be improved greatly, and additionally treatment equipment can further be prevented from being scaled.

Description

technical field [0001] The invention relates to a method for recovering ammonia from waste water with high ammonia nitrogen, and belongs to the technical field of sewage treatment. Background technique [0002] At present, with the rapid increase of urban population and the continuous improvement of people's living standards, the output of landfill leachate and municipal sludge digestate in my country has also increased sharply. Landfill leachate and municipal sludge nitrification liquid contain high ammonia nitrogen content and high total hardness, which makes it difficult to handle; if ammonia is not recovered, it will also cause waste of resources. [0003] At present, the treatment methods of high ammonia nitrogen wastewater are divided into two categories: biological method and physical and chemical method. The efficiency of biological treatment is not high enough, and ammonia nitrogen is converted into nitrogen and released, so it cannot be utilized as a resource. Th...

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Problems solved by technology

The efficiency of biological treatment is not high enough, and ammonia nitrogen is converted into nitrogen and released, which cannot be used as a resource

The air stripping and stripping method is often used in the physicochemical method, but the traditional air stripping and stripping method has the disadvantages of low ammonia removal efficiency, easy fouling in the tower, high energy consumption, and high cost. Relevant researchers at home and abroad have been looking for an energy A new type of ammonia recovery process for high ammonia nitrogen wastewater that improves the efficiency of ammonia removal and solves problems such as scaling in the tower

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