High-ammonia-nitrogen waste water resource recovery technology

Abstract

The invention discloses a high-ammonia-nitrogen waste water resource recovery technology. A method used in the technology comprises the following steps of: removing solid impurities from waste water by performing flocculation and solid-liquid separation, treating with a membrane concentrating system to obtain two parts, and performing ammonium-nitrogen oxidation on one part, i.e., purified water through chlorine dioxide for recycling; and adding an alkali into the other part, i.e., a concentrated solution for regulating, performing solid-liquid separation for removing solids, feeding into an ammonia separating tower for removing ammonia, reacting ammonia gas extracted from the ammonia separating tower with formaldehyde in a reaction kettle to generate urotropine serving as a medical intermediate with a high added value, and directly discharging ammonia-removed tower bottom water or discharging after feeding chemicals, removing ammonia and filtering. The method is suitable for ammonia-nitrogen waste water of which the ammonia-nitrogen concentration is over 300 mg / L; treated discharged water can reach a national first class discharge standard; and the ammonia-nitrogen concentration in waste water is higher, the waste water treatment profit is higher.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a high ammonia nitrogen wastewater recycling technology. Background technique [0002] With the rapid development of the chemical industry, a large amount of high-concentration ammonia-nitrogen wastewater is produced, especially in titanium dioxide, electrolytic manganese, coking industries and chemical fertilizer production industries; due to the relatively high concentration of ammonia-nitrogen in wastewater, it is difficult to meet the standard treatment technology , the risk of pollution to the environment is also relatively large; there are many known existing technologies for the treatment of high ammonia nitrogen wastewater; there are mainly the following three categories: [0003] 1. The first type of method is to use one or more of biological, physical or chemical methods to directly oxidize ammonia nitrogen in wastewater or convert it into solid waste resid...

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Problems solved by technology

[0006] The present invention solves the existing problems in resource utilization of high-ammonia-nitrogen waste water: firstly, it eliminates the possibility that suspended solids and other impurities in the waste water will block the system, resulting in paralysis of the deamination system or affecting the quality of recovered products; secondly, the ammonia in the waste water is Transform it into another high value-added product to improve the economic benefits of wastewater treatment, thereby completely solving the economic problem of high ammonia nitrogen wastewater resource utilization;

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