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High-concentration ammonia nitrogen wastewater treatment system and treatment method

An ammonia nitrogen wastewater treatment system technology, which is applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc. It can solve the problem of large changes in water quality, increased mass transfer resistance, and low system stability. and other problems to achieve the effect of saving heat source, solving energy waste and increasing economic benefits

Inactive Publication Date: 2016-12-07
上海凯工石油装备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional biological treatment process is a commonly used high ammonia nitrogen wastewater treatment process in China, but the removal rate is low, and it is greatly affected by water quality changes, and the system stability is low
[0004] At present, the treatment of high-concentration ammonia-nitrogen-containing wastewater requires ammonia resources to be recycled to achieve the unity of economic and environmental benefits. Quality resistance, increase cost

Method used

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  • High-concentration ammonia nitrogen wastewater treatment system and treatment method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: 25°C high ammonia nitrogen wastewater has a flow rate of 8 tons / hour, a total ammonia nitrogen content of 10000 mg / L, and contains a certain amount of inorganic salt components. Mix with 33% NaOH alkali solution, after the pH reaches 11, enter the three-effect evaporation device, the temperature is 72°C, and the absolute pressure is 34KPa.

[0053] The high-concentration ammonia-containing wastewater evaporated efficiently is heated to 80°C by the rectification preheater, and then enters the rectification ammonia distillation tower. The bottom of the tower is 90°C, the top of the tower is 85°C, and the absolute pressure is 70KPa; Finally, concentrated ammonia water is obtained, and the tower bottom liquid enters the waste water collection tank.

[0054] The low-ammonia nitrogen and high-salt wastewater at the bottom of the three-effect evaporator enters the upper part of the scraper evaporator at a temperature of 70°C and an absolute pressure of 32KPa; the li...

Embodiment 2

[0055] Example 2: 25°C high ammonia nitrogen wastewater has a flow rate of 8 tons / hour, a total ammonia nitrogen content of 20,000 mg / L, and contains a certain amount of inorganic salt components. Mix with 33% NaOH alkali solution, after the pH reaches 11, enter the three-effect evaporation device, the temperature is 72°C, and the absolute pressure is 34KPa.

[0056] The high-concentration ammonia-containing wastewater evaporated efficiently is heated to 80°C by the rectification preheater, and then enters the rectification ammonia distillation tower. The bottom of the tower is 90°C, the top of the tower is 85°C, and the absolute pressure is 70KPa; Finally, concentrated ammonia water is obtained, and the tower bottom liquid enters the waste water collection tank.

[0057] The low-ammonia nitrogen and high-salt wastewater at the bottom of the three-effect evaporator enters the upper part of the scraper evaporator at a temperature of 70°C and an absolute pressure of 32KPa; the l...

Embodiment 3

[0058] Example 3: The flow rate of high ammonia nitrogen wastewater at 37°C is 8 tons / hour, the total ammonia nitrogen content is 10000 mg / L, and contains a certain amount of inorganic salt components. Mix with 38% NaOH alkali solution, after the pH reaches 11, enter the three-effect evaporation device, the temperature is 72°C, and the absolute pressure is 34KPa.

[0059] The high-concentration ammonia-containing wastewater evaporated efficiently is heated to 80°C by the rectification preheater, and then enters the rectification ammonia distillation tower. The bottom of the tower is 90°C, the top of the tower is 85°C, and the absolute pressure is 70KPa; Finally, concentrated ammonia water is obtained, and the tower bottom liquid enters the waste water collection tank.

[0060] The low-ammonia nitrogen and high-salt wastewater at the bottom of the three-effect evaporator enters the upper part of the scraper evaporator at a temperature of 70°C and an absolute pressure of 32KPa; ...

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Abstract

The invention provides a high-concentration ammonia nitrogen wastewater treatment system and treatment method. The treatment system comprises a pretreating and regulating unit, a triple-effect evaporation unit, a rectifying and ammonia distilling unit and a film scraper evaporation unit; the pretreating and regulating unit is used for receiving high-concentration ammonia nitrogen wastewater and regulating the pH value of the high-concentration ammonia nitrogen wastewater to be alkaline; the triple-effect evaporation unit is used for evaporating the alkalized high-concentration ammonia nitrogen wastewater into desalted high-concentration ammonia-containing wastewater and low-ammonia-nitrogen high-salinity wastewater; the rectifying and ammonia distilling unit is used for conducting rectifying and ammonia distilling on the desalted high-concentration ammonia-containing wastewater to generate ammonium hydroxide and low-ammonia-nitrogen tail water capable of being biochemically treated; the film scraper evaporation unit is used for evaporating the low-ammonia-nitrogen high-salinity wastewater into low-ammonia-nitrogen tail water capable of being biochemically treated and high-concentration saline water. According to the wastewater treatment system, after the high-concentration ammonia nitrogen wastewater is subjected to efficient evaporation, rectifying and ammonia distilling and film scraper evaporation desalting, the ammonia recovery efficiency can reach 95% or above, ammonium hydroxide can be effectively recovered to increase the economic benefit, and inorganic salt components in the wastewater are removed; by adopting an efficient evaporation device, heat energy is effectively saved, and the energy utilization efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a high-concentration ammonia nitrogen wastewater treatment system and treatment method. Background technique [0002] Ammonia nitrogen is a pollutant that has a serious impact on the water environment. Its main manifestations are eutrophication of water bodies, promotion of algae reproduction, large consumption of dissolved oxygen in water, death of aquatic organisms, and foul odor of water bodies. The discharge standard currently adopted in my country is the "Comprehensive Wastewater Discharge Standard", which divides the ammonia nitrogen discharge standard into two levels according to the different wastewater discharge waters: the first level standard ammonia nitrogen discharge concentration is less than or equal to 15mg / L, the second level standard ammonia nitrogen discharge concentration Less than or equal to 25mg / L. At the same time, the relevant indu...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/16
CPCC02F9/00C02F2101/16C02F1/66C02F1/08C02F1/048
Inventor 李必文李天琦廖虎王涛郭函君张辉
Owner 上海凯工石油装备科技有限公司
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