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Process for removing COD (Chemical Oxygen Demand) in high-salinity wastewater

A high-salt wastewater, process technology, applied in water pollutants, water/sewage treatment, water/sewage multi-stage treatment, etc. Reduce business costs and achieve the effect of waste recycling

Pending Publication Date: 2021-10-26
浙江欧德利科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The high concentration of salts in wastewater has an inhibitory effect on microorganisms, and the commonly used biochemical methods are difficult to treat, while other existing physical and chemical treatment methods have the disadvantages of unstable operation and high operating costs

Method used

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  • Process for removing COD (Chemical Oxygen Demand) in high-salinity wastewater
  • Process for removing COD (Chemical Oxygen Demand) in high-salinity wastewater
  • Process for removing COD (Chemical Oxygen Demand) in high-salinity wastewater

Examples

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Embodiment 1

[0034] This embodiment discloses a COD removal process in high-salt wastewater, comprising the following steps:

[0035] (1) PH adjustment: transfer the high-salt wastewater to the pH adjustment tank with stirring, add acid (hydrochloric acid or sulfuric acid) while stirring the high-salt wastewater, and adjust the pH of the wastewater to 3-4.

[0036] (2) Oxidation treatment: The effluent from step (1) is fed into the Fenton oxidation tank by the lift pump, and H is added to the Fenton oxidation tank. 2 o 2 and ferrous sulfate and stir well, H 2 o 2 The mass ratio of COD to high-salt wastewater is 5:1, and H 2 o 2 with Fe in ferrous sulfate 2+ The molar ratio is 3:1.

[0037] (3) Active adsorption: step (2) the effluent flows into the activated carbon adsorption pool by itself, and the powdered activated carbon of the corresponding quality is added according to 3 to 6 times the COD mass concentration and fully stirred, and the adsorption treatment is 45-60min;

[0038]...

Embodiment 2

[0046] The process for removing COD in a kind of high-salt wastewater disclosed in this embodiment is basically the same as the process in Example 1, the only difference is: in step (2), H 2 o 2 The mass ratio of COD to high-salt wastewater is 6:1, and H 2 o 2 with Fe in ferrous sulfate 2+ The molar ratio is 6:1.

Embodiment 3

[0048] The process for removing COD in a high-salt wastewater disclosed in this example is basically the same as the process in Example 1, except that the raw materials of powdered activated carbon include: 40 parts of activated sludge and 15 parts of sodium hydroxide in parts by weight. , 8 parts of sodium carbonate, 20 parts of gelatin, 4 parts of potassium bicarbonate, and the rest is deionized water.

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a process for removing COD (Chemical Oxygen Demand) in high-salinity wastewater, which comprises the following steps of: transferring the high-salinity wastewater into a pH regulating tank with a stirring function, adding acid while stirring the high-salinity wastewater, inputting effluent into a Fenton oxidation tank by a lifting pump, adding H2O2 and ferrous sulfate into the Fenton oxidation tank, fully conducitng stirring, enabling the effluent to automatically flow into an activated carbon adsorption tank, adding powdered activated carbon with the corresponding mass being 3-6 times of the COD mass concentration, fully conducting stirring, enabling the effluent to automatically flow into a concentrated water tank, adding alkali while stirring, inputting wastewater into a tubular microfiltration system through a circulating pump, and after filtration treatment, enabling water produced by a tubular ultrafiltration system to reach the standard and to be discharged or recycled. The defects in the prior art are overcome, Fenton oxidation, activated carbon adsorption and tubular micro (ultra) filtration processes are integrated, and the COD concentration in the high-salinity wastewater is effectively reduced by utilizing the oxidation effect of a Fenton reagent, the adsorption effect of powdered activated carbon and the filtration, interception and concentration effects of a tubular membrane system.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a process for removing COD in high-salt wastewater. Background technique [0002] High-salt wastewater refers to wastewater with a total salt content of at least 1%, which mainly comes from chemical plants, oil and natural gas collection and processing, etc. This wastewater contains a variety of substances (including salt, oil, organic heavy metals and radioactive substances, etc.) . [0003] The high-concentration salts in wastewater have an inhibitory effect on microorganisms, and the commonly used biochemical methods are difficult to treat. However, other existing physical and chemical treatment methods have the disadvantages of unstable operation and high operating costs. Saline wastewater is produced in a wide range of ways, and the amount of water is increasing year by year. It is very important to find an economical and reasonable process for the ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/30
CPCC02F9/00C02F1/66C02F1/722C02F1/725C02F1/283C02F1/444C02F2101/30
Inventor 刘新辉丁立成孙飞虎石培飞
Owner 浙江欧德利科技有限公司
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