Method for treating high-sulfide high-salinity high-COD (Chemical Oxygen Demand) waste water

A treatment method, sulfide technology, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of environmental pollution, complicated operation, low efficiency, etc., and achieve saving of operating costs and The effects of energy consumption, high processing efficiency and simple process flow

Inactive Publication Date: 2013-08-14
TIANJIN HUICHANG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a simple and efficient method for simultaneously removing sulfide,

Method used

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  • Method for treating high-sulfide high-salinity high-COD (Chemical Oxygen Demand) waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The production wastewater of a pesticide factory has a COD content of 10000mg / L, a sulfide content of 1000mg / L, and a salt content of 12000mg / L. Take 10L of waste water for treatment, and pass chlorine gas into the first-stage closed reactor at a speed of 1.5m / s for 0.177m 3 , using a temperature control device to maintain the temperature of the wastewater at 20°C. Under the same conditions, feed chlorine gas 0.032m into the secondary closed reactor 3 , obtained sulfur 9g after washing and separating with water. The rest of the waste water is injected with HCl gas for 2.24m at a speed of 0.5m / s at 10°C 3 , after filtration and separation, 119g of sodium chloride and 9.8kg of 11mol / L hydrochloric acid were obtained, realizing zero discharge of waste water.

Embodiment 2

[0018] The wastewater produced by a leather factory has a COD content of 5000mg / L, a sulfide content of 500mg / L, and a salt content of 15000mg / L. Take 10L of waste water for treatment, and pass chlorine gas into the first-stage closed reactor at a speed of 1.0m / s for 0.085m 3 , using a temperature control device to maintain the temperature of the wastewater at 15°C. Under the same conditions, feed chlorine gas 0.017m into the secondary closed reactor 3 , after separation and washing with water, 4.6 g of sulfur was obtained. The rest of the waste water is injected with HCl gas for 2.68m at a speed of 0.3m / s at 8°C 3 , after filtration and separation, 148g of sodium chloride and 9.75kg of 12mol / L hydrochloric acid were obtained, realizing zero discharge of waste water.

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Abstract

The invention belongs to the technical field of industrial sewage treatment and relates to a method for treating high-sulfide high-salinity high-COD (Chemical Oxygen Demand) waste water. The method comprises two steps namely a chlorine oxidation stage and a hydrogen chloride gas desalination stage and specifically comprises the following steps: introducing a certain amount of chlorine to the waste water, wherein organic substances contained in the waste water are decomposed and removed due to the oxidizing action of the chlorine, sulfides are oxidized to be separated out in a form of elemental sulfur; carrying out solid-liquid separation, and then recovering elemental sulfur; introducing a certain amount of hydrogen chloride gases to waste liquor subjected to the solid-liquid separation in the chlorine oxidation stage, wherein clear and transparent hydrochloric acid is retained because chlorine salt contained in the waste water with common-ion effect is gradually separated out; and carrying out solid-liquid separation, and then recovering the chlorine salt and the hydrochloric acid. The process disclosed by the invention can be carried out under constant pressure, not only can efficiently remove the sulfides, the organic substances and the inorganic salt out of industrial waste water, but also can recover the elemental sulfur, the chlorine salt and the hydrochloric acid through separation, thereby realizing the zero discharge of the waste water.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and relates to a treatment method for wastewater with high sulfide, high salinity and high chemical oxygen demand (COD). Background technique [0002] The manufacturing process of chemical products often brings a large amount of seriously polluted and extremely harmful high-sulfide, high-salt, high-COD wastewater, and the components and pollutant concentrations of wastewater produced by different industries are quite different. The treatment of wastewater with high sulfide, high salinity and high COD has always been a major problem in the industry. Wastewater) treatment methods. [0003] Chinese patent 200910226618.9 discloses a method for treating high-concentration and high-salt industrial wastewater by first improving the biodegradability of high-salt-content wastewater and then through biochemical treatment. It reduces the investment and operating costs of wastewater ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/76
Inventor 武彪李建新王虹李贤辉
Owner TIANJIN HUICHANG ENVIRONMENTAL PROTECTION TECH CO LTD
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