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Chlor-alkali wastewater treatment method

A wastewater treatment, chlor-alkali technology, applied in water/sewage treatment, water treatment parameter control, neutralized water/sewage treatment, etc., can solve the problems of waste, inability to recover chloride ions, high treatment cost, and achieve low cost and treatment methods. Simple and actionable effects

Inactive Publication Date: 2020-02-21
SHAANXI BEIYUAN CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional chlor-alkali wastewater treatment method is to send all the miscellaneous water to the sewage treatment plant for treatment. Not only the treatment cost is high, but also the chlorine ions in the wastewater cannot be recovered, resulting in waste

Method used

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  • Chlor-alkali wastewater treatment method

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Embodiment 1

[0033] A method for treating chlor-alkali wastewater, specifically: transporting chlor-alkali wastewater to a wastewater treatment device to perform "ultrafiltration + nanofiltration membrane" treatment to eliminate organic matter, and obtain concentrated water and saline wastewater after treatment, and the saline wastewater contains free chlorine , excessive calcium ions, recover the desulfurization water from the concentrated water, and transport the saline wastewater to the neutralization tank; add hydrochloric acid, adjust the pH value of the saline wastewater to 9, and stir for 35 minutes; add sodium sulfite, sodium sulfite and The free chlorine in the salty wastewater undergoes oxidation-reduction reaction to remove chlorine, and stir for 30 minutes; add sodium carbonate to the neutralization tank, and the sodium carbonate and calcium ions in the saline wastewater undergo a precipitation reaction. After standing for 2 hours, the neutralization tank The saline wastewater i...

Embodiment 2

[0035] A method for treating chlor-alkali wastewater, specifically: transporting chlor-alkali wastewater to a wastewater treatment device to perform "ultrafiltration + nanofiltration membrane" treatment to eliminate organic matter, and obtain concentrated water and saline wastewater after treatment, and the saline wastewater contains free chlorine , excessive calcium ions, recover the desulfurization water from the concentrated water, and transport the saline wastewater to the neutralization tank; add hydrochloric acid, adjust the pH value of the saline wastewater to 8, and stir for 40 minutes; add sodium sulfite, sodium sulfite and sodium sulfite to the neutralization tank The free chlorine in the salty wastewater undergoes oxidation-reduction reaction to remove chlorine, and stir for 40 minutes; add sodium carbonate to the neutralization tank, and the sodium carbonate and calcium ions in the saline wastewater undergo a precipitation reaction. After standing for 2.5 hours, the ...

Embodiment 3

[0037] A method for treating chlor-alkali wastewater, specifically: transporting chlor-alkali wastewater to a wastewater treatment device to perform "ultrafiltration + nanofiltration membrane" treatment to eliminate organic matter, and obtain concentrated water and saline wastewater after treatment, and the saline wastewater contains free chlorine , excessive calcium ions, recover the desulfurization water from the concentrated water, and transport the saline wastewater to the neutralization tank; add caustic soda, adjust the pH value of the saline wastewater to 7, and stir for 30 minutes; add sodium sulfite, sodium sulfite and sodium sulfite to the neutralization tank The free chlorine in the salty wastewater undergoes oxidation-reduction reaction to remove chlorine, and stir for 35 minutes; add sodium carbonate to the neutralization tank, and the sodium carbonate and calcium ions in the salty wastewater undergo precipitation reaction, and after standing for 3 hours, the neutra...

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Abstract

The invention discloses a chlor-alkali wastewater treatment method, which specifically comprises: 1, conveying chlor-alkali wastewater into a wastewater treatment device, treating and eliminating organic matters, recovering desulfurization water from concentrated water, and conveying salt-containing wastewater into a neutralization tank; 2, adjusting the pH value of the salt-containing wastewaterto 7-9, and stirring for 30-40 min; 3, adding a reducing agent into the neutralization tank to remove chlorine, and stirring for 30-40 min; 4, adding a precipitant into the neutralization tank, carryout a precipitation reaction with the calcium ions in the salt-containing wastewater, and standing for 2-3 h, wherein the salt-containing wastewater in the neutralization tank is separated into supernatant and lower-layer sludge; and 5, conveying the supernatant to a brine collection device by using a pump, purifying, outputting the brine meeting brine production requirements, conveying the lower-layer sludge into a filter press, and carrying out filter pressing to form a cake. According to the invention, the chlor-alkali wastewater treatment method can recover chlorine ions in chlor-alkali wastewater.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and relates to a method for treating chlor-alkali wastewater. Background technique [0002] Chlor-alkali chemical industry is a basic chemical industry. The chlor-alkali wastewater caused by the chlor-alkali industry mainly includes acid-base wastewater regenerated from chelating resin towers, waste acid-base water regenerated from cathode and anode beds, evaporated alkaline condensate water, circulating water sewage, and polymerization mother liquor water , reverse osmosis concentrated water, etc. In addition to the basic characteristics of chemical wastewater, chlor-alkali wastewater also has its own characteristics, such as large water volume, large changes in water quality, high salt content, high chloride ion content, complex components, and diverse pollutants. The traditional chlor-alkali wastewater treatment method is to send all the miscellaneous water to the sewage treatment...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/10C02F101/12C02F101/30
CPCC02F1/442C02F1/444C02F1/5281C02F1/66C02F1/70C02F9/00C02F2001/007C02F2101/10C02F2101/12C02F2101/30C02F2209/06
Inventor 刘国强刘延财申建成张宇宁小钢王奋中边亚平熊磊慕毅张明韩慧珏袁丽华
Owner SHAANXI BEIYUAN CHEM GROUP
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