Adsorption and microelectrolysis cooperative treatment method for coking reverse osmosis concentrated wastewater

A technology of reverse osmosis concentration and synergistic treatment, applied in the fields of energy wastewater treatment, special compound water treatment, water/sewage treatment, etc., can solve the problems of lack of effectiveness evaluation, membrane pollution, difficulty in crystallization and purification, etc., and achieve green and low-consumption treatment. efficiency, improve processing efficiency, and save cost and consumption

Pending Publication Date: 2022-06-03
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0003] At present, the treatment of coking wastewater is mainly based on the principle of combining primary treatment process and secondary treatment process and tertiary advanced treatment. The reverse osmosis concentrated wastewater produced by the reverse osmosis device is seriously polluted
Concentrated reverse osmosis wastewater contains high concentrations of chlorides and organic pollutants, which are higher than raw water and difficult to treat
The discharge of reverse osmosis concentrated wastewater into the environment will have a great negative impact on the ecosystem and lead to the deterioration of water resources
[0004] At present, coking reverse osmosis concentrated wastewater is mainly treated by direct evaporation and crystallization process. The separation of inorganic ions can effectively alleviate the scale problem, but it cannot solve the problem of organic pollution. The crystallized mixed salt contains toxic and harmful substances, which are harmful to human body and environment. It is extremely large, and there are serious membrane pollution, equipment corrosion, difficulty in crystallization purification, and equipment blockage caused by crystallization during the treatment process.
The existing similar micro-electrolysis methods are mainly aimed at the removal of TOC or COD, and use this as an evaluation index, but the removal effect of toxic organic substances, such as phenols, benzenes and nitrogen-containing heterocycles, is limited, and there is a lack of effective sex assessment

Method used

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  • Adsorption and microelectrolysis cooperative treatment method for coking reverse osmosis concentrated wastewater
  • Adsorption and microelectrolysis cooperative treatment method for coking reverse osmosis concentrated wastewater
  • Adsorption and microelectrolysis cooperative treatment method for coking reverse osmosis concentrated wastewater

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Embodiment approach

[0045] The present invention is an adsorption micro-electrolysis synergistic treatment method for coking reverse osmosis concentrated wastewater, which combines activated carbon adsorption, iron-carbon micro-electrolysis and Fenton reaction, and comprises the following steps:

[0046] Step 1, treatment of activated carbon.

[0047] Commercial activated carbon (5 g) was boiled with 30% sodium hypochlorite for 2 hours, then filtered with deionized water and dried for 6 hours. The pretreated AC was reacted with 0.1M mild oxidant (citric acid, tartaric acid, malic acid and salicylic acid mixed) in a 1000ml round bottom flask, specifically the mixture was continuously stirred at 125°C for 14h. After cooling, the mixture was washed with deionized water, keeping the pH of the wash at 7.0 to remove unreacted acid, then the product O-AC was filtered and dried at 80°C.

[0048] The treated activated carbon has larger pore size and adsorption capacity than the original activated carbon....

Embodiment 1

[0072] Step 1. Activated carbon of category P-1400-Y was treated as described previously.

[0073] Step 2, take 4 L of coking reverse osmosis concentrated wastewater, dropwise add 1 mol / L of H 2 SO 4 The solution was measured with a pH meter to bring the pH to 2. After aeration at 2min / L for 30min, 0.6g / L of activated carbon was added to carry out the adsorption reaction for 30min, which could enrich 70.34% of the organic matter in the water.

[0074] Step 3, take 100 mL of wastewater after adsorption, and under the condition of aeration for 2 min / L in the whole process, carry out the reaction in a solution with a mass ratio of iron to carbon of 1:2, adjust the pH to 2 and carry out micro-electrolysis reaction for 3 h, take 100 mL of filtered effluent, Add 30% H directly to the solution 2 O 2 The solution was 0.2 mL, and the pH of the solution was adjusted to 8.5 with 40% NaOH solution after aeration reaction (2 L / min) for 2 h. After the precipitation is no longer produce...

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Abstract

The adsorption and micro-electrolysis cooperative treatment method for the coking reverse osmosis concentrated wastewater comprises the following steps: adding activated carbon into the coking reverse osmosis concentrated wastewater, and after the activated carbon is adsorbed and saturated, adding scrap iron under the condition that the pH value of the coking reverse osmosis concentrated wastewater is 2-3, and carrying out micro-electrolysis reaction to obtain a reaction solution A; hydrogen peroxide is added into the reaction liquid A for a Fenton reaction, a reaction liquid B is obtained, the pH of the reaction liquid B is adjusted to be 8-9, the obtained mixed system is filtered after no precipitate is generated, and filtrate is treated wastewater. According to the method, the treatment rate of the reverse osmosis concentrated water of the coking wastewater is improved in a manner of combining activated carbon adsorption, Fe0-C micro-electrolysis and a Fenton technology, the toxicity of the wastewater is reduced, and an effective and applicable method is provided for treating the reverse osmosis concentrated water of the coking wastewater.

Description

technical field [0001] The invention relates to the field of high-salt and refractory coking reverse osmosis concentrated water treatment, in particular to an adsorption micro-electrolysis synergistic treatment method for coking reverse osmosis concentrated wastewater. Background technique [0002] In recent years, with the rapid development of industry, the global demand for steel continues to grow. As one of the main energy sources of the steel industry, coal is exploited and utilized in large quantities. Coal carbonization produces a large amount of highly toxic coking wastewater. [0003] At present, the treatment of coking wastewater is mainly based on the principle of combining the primary treatment process with the secondary treatment process and the tertiary advanced treatment. The reverse osmosis concentrated wastewater produced by the reverse osmosis device is seriously polluted. Reverse osmosis concentrated wastewater contains high concentrations of chlorides and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/30
CPCC02F9/00C02F1/283C02F1/66C02F1/461C02F1/722C02F1/725C02F1/001C02F2101/30C02F2305/026Y02W10/37
Inventor 朱超南康康李浦风赖杨刘嘉欣王沛涵
Owner SHAANXI UNIV OF SCI & TECH
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