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Method and system for recycling crystallized salt resources in high-salt-content wastewater zero discharge

A technology for resource recovery and saline wastewater, applied in chemical instruments and methods, alkali metal sulfite/sulfite, water pollutants, etc., can solve problems such as hindering zero discharge of high saline wastewater, and reduce operating costs Effect

Active Publication Date: 2015-12-16
JIANGSU SUNPOWER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the disposal of solid miscellaneous salts is an important problem hindering the promotion of zero discharge technology for high-salt wastewater

Method used

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  • Method and system for recycling crystallized salt resources in high-salt-content wastewater zero discharge
  • Method and system for recycling crystallized salt resources in high-salt-content wastewater zero discharge
  • Method and system for recycling crystallized salt resources in high-salt-content wastewater zero discharge

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Embodiment 1

[0041] Such as figure 2 As shown, a system for recovering crystallized salt resources from highly saline wastewater with zero discharge includes a pretreatment system, a membrane concentration system and an evaporation crystallization system; the evaporation crystallization system includes sodium sulfate evaporation crystallization devices, chlorination The sodium evaporation crystallization device and the mixed salt evaporation crystallization device, the sodium sulfate evaporation crystallization device is composed of the first evaporation device and the first crystallizer in series, the sodium chloride evaporation crystallization device is composed of the second evaporation device and the second crystallizer in series, the mixed salt The evaporation and crystallization device is composed of a third evaporation device and a third crystallizer in series; the water outlet of the pretreatment system is connected to the water inlet of the membrane concentration system, and the w...

Embodiment 2

[0051] Such as image 3 As shown, a system for recovering crystalline salt resources from highly saline wastewater with zero discharge includes a pretreatment system, a membrane concentration system, a nanofiltration membrane system and an evaporative crystallization system; the evaporative crystallization system includes a sodium sulfate evaporative crystallization device, a chlorine The sodium chloride evaporation crystallization device, the mixed salt evaporation crystallization device, the sodium sulfate evaporation crystallization device and the sodium chloride evaporation crystallization device are connected in parallel to the mixed salt evaporation crystallization device; the sodium sulfate evaporation crystallization device is connected in series by the first evaporation device and the first crystallizer Composition, the sodium chloride evaporation and crystallization device is composed of the second evaporation device and the second crystallizer in series, and the mixe...

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Abstract

The invention discloses a method for recycling crystallized salt resources in high-salt-content wastewater zero discharge. Salt-containing wastewater is treated through one or more of a pretreatment system, a membrane concentration system, a nanofiltration membrane system and an evaporation crystallization system to obtain recycled water and solid salt. The invention further discloses a system for recycling crystallized salt resources in high-salt-content wastewater zero discharge. The system comprises the pretreatment system, the membrane concentration system, the nanofiltration membrane system and the evaporation crystallization system, wherein one or more of the systems is / are used for treatment; the evaporation crystallization system comprises one or more evaporation devices and one or more crystallization devices. The multiple evaporation devices are connected in parallel or in series or connected in a parallel connection and serial connection mixed mode, and the multiple crystallization devices are connected in parallel or in series or connected in a parallel connection and serial connection mixed mode. 15-25% of three-high wastewater treated by a traditional water treatment technology is further treated, the recovery rate of the wastewater reaches over 95%, meanwhile, salt is crystallized to be solid abraum salt, and then high-salt-content wastewater zero discharge is achieved.

Description

technical field [0001] The invention relates to a method and a system for recovering crystalline salt resources with zero discharge of liquid, in particular to a method and system for recovering crystalline salt resources with zero discharge of high-salt wastewater. Background technique [0002] As the country pays more attention to environmental protection, it begins to control the total amount of discharge. General sewage can be discharged up to standard through biological and chemical treatment technologies. However, a large amount of high-salt wastewater produced by national pillar industries such as petrochemical, coal chemical, electric power, oil extraction, and mining can only recover 75% to 85% of the wastewater through chemical, membrane, reverse osmosis and other traditional means, and the remaining concentrated 15% to 25% of high-concentration saline wastewater cannot be effectively treated so far, and some are stored through exposure tanks. The process method is...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/04C01D5/00C02F1/44C02F1/02C02F101/12C02F101/10
Inventor 郭宏新李东刘丰彭艳梅陈飞
Owner JIANGSU SUNPOWER TECH
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