Energy-saving evaporation treatment process of high-salinity wastewater

A high-salt wastewater treatment technology, applied in the direction of heating water/sewage treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of high impurity content, difficult to meet the waste water standard, difficult to effectively use, etc. Achieve the effect of reducing impurity content, short treatment process and remarkable energy saving effect

Active Publication Date: 2013-03-13
山东大明消毒科技有限公司
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Problems solved by technology

[0003] At present, the commonly used treatment methods are multi-effect evaporation followed by flaking with a flaker or spray granulation followed by drying in a fluidized bed. However, these methods often consume a large amount of energy such as steam, electricity or coal, and the production cost is high. , and the final evaporated inorganic salts often contain crystal water, which has high impurity content and is difficult to effectively use, and the final discharged wastewater is also difficult to meet the standard

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  • Energy-saving evaporation treatment process of high-salinity wastewater

Examples

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Effect test

Embodiment 1

[0045] Example 1 Taking the wastewater containing ammonium chloride produced during the production of potassium dihydrogen phosphate as an example, the specific treatment process is as follows:

[0046] ① Evaporation system: 500kg of ammonium chloride wastewater with 10% ammonium chloride concentration treated by the sewage treatment system is passed into the raw material tank, and then sent to the primary preheater and secondary preheater for grading preheating , After preheating, it is transported to the evaporator and heated and evaporated at 30°C to obtain the ammonium chloride evaporation liquid with a concentration of 25%;

[0047] ②Concentration system: the ammonium chloride evaporation liquid enters the first storage tank and is stored after removing impurities from the adsorption layer. The adsorption layer is supported by the upper and lower grid plates. The weight of activated coal gangue in the adsorption layer is 5kg. After storage, the ammonium chloride is evaporated ...

Embodiment 2

[0053] Example 2 Taking the sodium chloride-containing wastewater produced during the production of epoxy resin as an example, the specific treatment process is as follows:

[0054] ① Evaporation system: 1t of sodium chloride wastewater with a sodium chloride concentration of 18% that has been treated by the sewage treatment system is passed into the raw material tank, and then sent to the primary preheater and secondary preheater for grading preheating , After preheating, it is transported to the evaporator and heated and evaporated at 100°C to obtain a 35% sodium chloride evaporation liquid;

[0055] ②Concentration system: the sodium chloride evaporation liquid enters the first storage tank and is stored after removing impurities from the adsorption layer. The adsorption layer is supported by the upper and lower grid plates. The weight of activated coal gangue in the adsorption layer is 20kg, and the sodium chloride after storage is evaporated The liquid is transported to the hig...

Embodiment 3

[0061] Example 3 Taking the waste water containing calcium chloride produced during the production of sodium dichloroisocyanurate as an example, the specific treatment process is as follows:

[0062] ① Evaporation system: 2t of calcium chloride wastewater with a calcium chloride concentration of 14% that has been treated by the sewage treatment system is passed into the raw material tank, and then sent to the primary preheater and secondary preheater for grading preheating , After preheating, it is transported to the evaporator and heated and evaporated at 65°C to obtain a calcium chloride evaporation liquid with a concentration of 30%;

[0063] ②Concentration system: Calcium chloride evaporation liquid enters the first storage tank and is stored after removal of impurities by the adsorption layer. The adsorption layer is supported by the upper and lower grid plates. The weight of activated coal gangue in the adsorption layer is 30kg, and the stored calcium chloride evaporates The ...

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Abstract

The invention provides an energy-saving evaporation treatment process of high-salinity wastewater. The energy-saving evaporation treatment process comprises an evaporating system, a concentrating system, a drying system and a heat circulating system. Grading preheating, heating evaporation, adsorption purification, concentration, adsorption purification and high-temperature drying are successively carried out on the high-salinity wastewater treated by a wastewater treatment system to obtain the finished product of inorganic salt, heat exhausted in the evaporation, concentration and drying processes is recycled, and wastewater is discharged. By adopting the technical scheme, wastewater discharged finally meets the national industrial wastewater discharge standard, the purity of the obtained inorganic salt is as high as 99.3%, and the energy-saving effect is remarkable.

Description

Technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to an energy-saving evaporation treatment process for high-salt wastewater. Background technique [0002] The waste water discharged in the industrial production process often contains high concentrations of inorganic salts, especially the inorganic salt by-products in the chemical production process or the large amount of inorganic salts produced by adjusting the pH and alkalinity of the solution will make the final discharged waste water have a higher concentration of inorganic salts. High-salt wastewater has the characteristics of large discharge volume, strong toxicity and high difficulty in treatment. [0003] At present, the commonly used treatment methods include multi-effect evaporation followed by flake formation with a flake machine or spray granulation followed by fluidized bed drying. However, these methods often require a large amount of ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01F11/30C01C1/16C01D3/06C01D5/18C02F1/28C02F1/04
Inventor 邵长银李成顺侯贺义程明峰
Owner 山东大明消毒科技有限公司
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