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Process for recycling ammonium chloride waste water

A wastewater treatment and ammonium chloride technology, which is applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, applications, etc., can solve problems such as high operating costs, high labor intensity, and unstable concentration of evaporative condensed water , to achieve the effects of reduced steam consumption, compact equipment layout, and flexible and variable production capacity

Inactive Publication Date: 2011-04-20
HANGZHOU BLUETEC ENVIRONMENTAL TECH
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

They generally adopt tube-and-tube evaporation technology with high operating costs, unstable concentration of evaporative condensed water, and high labor intensity
Most domestic ammonium chloride wastewater treatment does not systematically analyze the process characteristics of the ammonium chloride recovery process from the perspectives of clean production, water balance, water resources and ammonium chloride recovery, and conduct comprehensive wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] 1. Pre-processing

[0020] The ammonium chloride wastewater with a mass percentage of 15% filtered by the plate and frame filter press in the workshop is collected in the underground adjustment tank, and acid is added to adjust the pH. The pH value is controlled below 6 and as close to 6 as possible, and then filtered through the bag filter and security The pretreatment of the device removes most of the suspended solids (SS), and the suspended solids (SS) are below 100 mg / l, so as to meet the requirements of the evaporation system and reduce the probability of fouling of the evaporation system.

[0021] 2. Ammonium chloride wastewater preheating

[0022] The gas separated by the third effect separation chamber and the third effect heating steam after heat exchange are used as the exothermic medium to preheat the feed liquid.

[0023] 3. Evaporation

[0024] A plate evaporator is used for three-effect evaporation of the feed liquid.

[0025] The first-effect evaporati...

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Abstract

The invention provides a process for recycling ammonium chloride waste water, which comprises the steps of pre-heating ammonium chloride waste water and performing triple effect evaporation on feed liquid by using a plate type evaporator in turn. The process has the advantages that: triple effect downstream evaporation is adopted, pressure is kept between normal pressure and low vacuum, and evaporation temperature is lowered with the increase in the ammonium chloride concentration in waste water to reduce the corrosion of a medium by ammonium chloride, and the enough gas heat generated by steam-liquid separation at the previous effect evaporation is used as the heat source for later effect evaporation, so that the heating medium is fully utilized and steam consumption and operation cost are reduced; the first effect evaporation and second effect evaporation are falling film evaporation which has high evaporating capacity; the third effect evaporation is forced circulation evaporation; and the concentration of ammonium chloride solution after triple effect evaporation is controlled to be saturated, cooling and crystallizing can be performed subsequently, and the dried material can be used as a fertilizer directly and has a high commercial value.

Description

technical field [0001] The invention relates to a process for treating ammonium chloride wastewater. Background technique [0002] For the ammonium chloride wastewater produced by the metal smelting industry, many studies have been carried out at home and abroad, but they mainly focus on the wastewater treatment process. They generally adopt tube-and-tube evaporation technology with high operating costs, unstable concentration of evaporative condensed water, and high labor intensity. Most domestic ammonium chloride wastewater treatment has not systematically analyzed the process characteristics of the ammonium chloride recovery process from the perspectives of clean production, water balance, water resources and ammonium chloride recovery, and carried out comprehensive treatment of wastewater. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a process for treating and reusing ammonium chloride wastewater, which c...

Claims

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Application Information

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IPC IPC(8): C02F9/10C05C3/00
Inventor 楼永通李嘉
Owner HANGZHOU BLUETEC ENVIRONMENTAL TECH
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