Recycling method of ammonia from ammonia-bearing multi-phase mixed wastewater

Abstract

The invention relates to a recycling method of ammonia from ammonia-bearing multi-phase mixed wastewater, which includes steps of: pretreatment of the ammonia-bearing multi-phase mixed wastewater, steam stripping for ammonia removal from the wastewater, and wet-type washing for recycling ammonia. The step of steam stripping for ammonia removal aims to strip concentrated ammonia gas from ammonia, in the ammonia-bearing multi-phase mixed wastewater, with steam in a steam stripping column, wherein the concentrated ammonia gas exits from the steam stripping column and enters a water tank at the bottom of the column, so that ammonia gas can be absorbed by cold water to form concentrated ammonia water at high efficiency, ammonia recycled as a resource; then the purified gas then is discharged from an outlet of the absorption column, and the wastewater, after ammonia removal, flows down into the water tank at the bottom of the column, while water with other components is discharged via a sewage pump and enters the next processing step. Through the steam stripping, ammonia in the ammonia-bearing wastewater can be removed, thus reducing emission of dangerous wastes. The method is high-effective and energy-saving, is high in economic value and practicability, is simple in equipment construction and low in cost, has great adaptability and can high-effectively and safely recover the ammonia, thus achieving reutilization of resources.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for recovering ammonia from ammonia-containing multiphase mixed wastewater. Background technique [0002] With the rapid development of my country's chemical, metallurgical, petrochemical, pharmaceutical, food and other industries, the problem of ammonia-containing wastewater pollution has become more and more serious. The discharge of a large amount of ammonia-containing wastewater will lead to eutrophication of water bodies, resulting in water body pollution, seriously endangering people's health and affecting people's normal life. At the same time, the random discharge of a large amount of ammonia-containing wastewater is also a waste of resources. The pollutants in ammonia-containing wastewater are mainly free ammonia and ammonia in the form of ammonium salts. Commonly used treatment methods are: oxidation method, zeolite adsorption method, pressurized ammonia disti...

AI Technical Summary

Problems solved by technology

The method of acid-base neutralization requires the introduction of sulfuric acid and other acid liquids, which brings complexity and risk to the operation; while direct condensation is often carried out by passing into a condensing device or exchanging heat with other devices. These methods often have The cooling speed is not fast enough, the cooling efficiency is relatively low, and the recovery process is complicated, etc.

In addition, the steam stripping method also has problems such as large energy consumption.

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