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Process for treating wastewater comprising high-concentration ammonium salt and sodium salt

A technology for treating process and wastewater, applied in water/sewage treatment, multi-stage water/sewage treatment, heating water/sewage treatment, etc. Effect

Active Publication Date: 2011-01-05
SHANGHAI CN WATER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Chinese invention patent 200910010988.9 discloses a method for treating wastewater containing ammonia, vanadium, chromium and sodium sulfate. This method uses the method of adding alkali to remove ammonia gas to treat ammonium salts and lye, which consumes a lot of water and has high operating costs.

Method used

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  • Process for treating wastewater comprising high-concentration ammonium salt and sodium salt
  • Process for treating wastewater comprising high-concentration ammonium salt and sodium salt
  • Process for treating wastewater comprising high-concentration ammonium salt and sodium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 Containing sodium salt and ammonium brine evaporation crystallization test

[0042] Test the solubility of sodium chloride, ammonium chloride, ammonium sulfate and sodium sulfate in water, the results are shown in table 1:

[0043] Solubility Table of Table 1 Sodium Salt and Ammonium Salt in Water

[0044]

[0045] Draw the solubility curve according to the data in Table 1. It can be seen that the solubility of ammonium salt increases greatly with the increase of temperature; the solubility of sodium sulfate is the largest at 32.2 ° C, and the solubility slowly decreases when it is greater than 32.2 ° C; the solubility of sodium chloride changes little with temperature .

[0046] According to these features, the applicant designed a set of small-scale experimental equipment, prepared five kinds of solutions as shown in Table 2, and observed the crystallization situation of each salt at high temperature and low temperature when four kinds of salts existe...

Embodiment 2

[0054] Such as image 3 As shown, the waste water treatment system containing ammonium salt and sodium salt of the present invention adopts a four-effect evaporation system. The wastewater treatment process is as follows:

[0055] The pretreated raw water 1 is sent to the preheater 3 by the preheat pump 2 for preheating, and the heat source 32 of the preheater 3 comes from the evaporation condensate of each effect. Circulation pump 6, evaporator 5 and heat exchanger 7 form the fourth effect evaporation system. The waste water from preheater 3 is forced to circulate through heat exchanger 7 by circulation pump 6 and then enters evaporation chamber 5 after being heated up, where the solution evaporates in evaporation chamber 5. After concentration, the circulation pump 6 continuously circulates and heats to evaporate and concentrate. The overflow part of the evaporation chamber is sent to the previous effect evaporation and concentration system by the pump 29. The vacuum pump...

Embodiment 3

[0063] Such as figure 2 Shown: the waste water treatment system containing ammonium salt and sodium salt of the present invention adopts a vapor compression heat pump type evaporation system. The wastewater treatment process is as follows:

[0064] The pretreated raw water 1 is sent to the preheater 3 by the preheat pump 2 for preheating, and the heat source of the preheater 3 is supplied by the condensate pump 4, and the condensate 5 after cooling can be reused in the production system.

[0065] The circulation pump 9, the heat exchanger 6, the evaporation chamber 8 and the vapor compression heat pump 7 form an evaporation concentration system. The waste water from the preheater 3 enters the evaporation chamber 8, and is forced to circulate through the heat exchanger 6 to be heated by the circulation pump 9. After heating, the solution circulates into the evaporation chamber 8 to evaporate, concentrate and crystallize. The heat pump 7 compresses and heats up the evaporatio...

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Abstract

The invention provides a process for separating out high-purity ammonium salt and sodium salt by combining evaporation concentration crystallization and cooling crystallization aiming at wastewater comprising high-concentration ammonium salt and sodium salt according to characteristic difference that solubility of the ammonium salt and the sodium salt varies along with temperature. In the process, the wastewater is pretreated, molar weight proportion of Cl<-> and NH<4+> in the wastewater is adjusted, and high-purity sodium salt and ammonium salt are recovered by high-temperature evaporation concentration crystallization and vacuum cooling crystallization respectively. The wastewater which is subjected to evaporative condensation is recycled in a production system, and the separated ammonium salt and sodium salt are used by factories as raw materials, so the comprehensive utilization and absolute treatment of a wastewater resource are ensured, and economic benefit and social benefit of the factories are improved. The process is suitable for treating the wastewater which comprises high-concentration ammonium salt and sodium salt and is produced in wet metallurgy enterprises and salty chemical enterprises.

Description

technical field [0001] The invention relates to a treatment process for waste water containing high-concentration ammonium salt and sodium salt, in particular to a process for separately recovering ammonium salt and sodium salt from waste water containing ammonium chloride, ammonium sulfate, sodium chloride and sodium sulfate The method belongs to the field of industrial wastewater treatment. Background technique [0002] For the high-concentration ammonium salt and sodium salt wastewater discharged from the hydrometallurgical process, the main treatment processes are as follows: [0003] 1. Add alkali (NaOH or Ca(OH) 2 ) deamination, the treatment is not thorough. [0004] 2. Freeze and crystallize after evaporation and concentration. At this time, the crystallization is a mixture of ammonium salt and sodium salt, and it will be treated as solid waste. [0005] 3. The ammonia is absorbed in the degassing process by adding alkali to form ammonia water for reuse, and the w...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/04C02F1/38C02F1/58
Inventor 赵志安丁立平杨徐烽刘伟国徐克俭
Owner SHANGHAI CN WATER
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