Method for reutilization of water resources and transformation and utilization of salt in waste water

A technology for water resources and waste water, applied in chemical instruments and methods, water softening, water/sewage treatment, etc., can solve problems that do not involve resource utilization, water pollution, secondary soil pollution, etc., and achieve energy saving and protection Environmental and treatment cost saving effects

Inactive Publication Date: 2016-08-31
LUXI CHEM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, many domestic enterprises mainly use reclaimed water to reuse or evaporate and crystallize miscellaneous salts to treat wastewater. Treatment, water "zero discharge" at the same time solid waste causes secondary soil pollution or water pollution
[0003] Altho

Method used

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  • Method for reutilization of water resources and transformation and utilization of salt in waste water

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] like figure 1 (1) Hard and silicon removal facilities: the waste water is adjusted to a pH of more than 10 by adding caustic soda in the hard and silicon removal unit, and the hardness ions such as calcium, magnesium and silicon in the waste water are removed by using the original carbonate and bicarbonate in the water. When the original carbonate and bicarbonate in the wastewater are insufficient, carbon dioxide is introduced into the wastewater to completely remove the hardness ions in the wastewater, and the produced calcium carbonate, magnesium hydroxide, silicate, etc. are separated from the water through clarification and filtration. After the sludge is dried, it is pulverized into 2-6mm particles as boiler desulfurizer.

[0021] (2) Membrane concentration facility: The waste water after hard and silicon removal is filtered by ultrafiltrat...

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Abstract

The invention discloses a method for reutilization of water resources and transformation and utilization of salt in waste water. The method includes the following steps that the pH value of the waste water is adjusted to be alkaline for hardness removal, generated settling sludge is separated out of the water and then dried to serve as a boiler desulfurizing agent, and the obtained waste water is subjected to ultra-filtration and multiple levels of reverse osmosis concentration; the waste water obtained in the former step is subjected to nano-filtration, and univalence salt and high-valence salt are separated; the univalence salt is further separated and transformed, prepared purified sodium chloride strong brine is concentrated, and the sodium chloride strong brine serves as a chloro-alkali raw material; potassium chloride is added into mixed brine which is separated out through nano-filtration and contains high-valence ions and univalence ions for a replacement reaction to generate potassium sulphate and sodium chloride, potassium sulphate and sodium chloride are separated through freezing crystallization and high-temperature evaporative crystallization, generated potassium sulphate serves as a raw material for producing chemical fertilizer, separated sodium chloride serves as a chloro-alkali production raw material, and the water and the salt in the waste water can be completely recycled.

Description

technical field [0001] The invention relates to the field of waste water resource recycling, in particular to a method for water resource reuse and salt conversion and utilization in waste water. Background technique [0002] At present, many domestic enterprises mainly use reclaimed water to reuse or evaporate and crystallize miscellaneous salts to treat wastewater. Treatment, water "zero discharge" at the same time solid waste causes secondary soil pollution or water pollution. [0003] Although there are methods in the prior art involving the recycling of waste water, they generally deal with a specific problem in the waste water, and none of them involve recycling all the water in the waste water and the salt at different prices, and need to add flocculants, etc. . For example, CN201210501778.1 discloses a method for resource utilization of acidic wastewater, including the following steps: a, adjusting the pH value of the acidic wastewater to 4.5-7; b, adding a floccul...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/04C02F1/22C02F1/441C02F1/442C02F1/444C02F1/66C02F5/02
Inventor 杨本华李杰白德泽王玉坤孟祥虎秦正超
Owner LUXI CHEM GRP
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