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Treatment technique suitable for high salt and high concentrated organic wastewater

A treatment process and process technology, applied in the field of high-salt and high-concentration organic wastewater treatment process, can solve the problems of impure useful salt, secondary pollution, complex evaporation residue composition, etc. Effect

Inactive Publication Date: 2009-03-11
YUNNAN UNIV
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

Although this method mentions the utilization of salts, there are still many deficiencies, such as incineration, which is easy to cause secondary pollution, and does not mention any further treatment, resulting in the impurity of the useful salt recovered; in addition, the components in the evaporation residue Complicated, it is troublesome to recover useful salt from it

Method used

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Examples

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Effect test

example 2

[0027] MgCl containing COD about 2600mg / L 2 High-salt and high-concentration organic wastewater is sent to the physical adsorption tank, and after removing some impurities, it is introduced into the grease trap. After sufficient separation, the lower water phase is sent to the aeration tank, and the water is sent to the oxidation reaction device after adding alkali aeration. After that, the water is sent to the concentration and crystallization device, and the pH value is adjusted after the concentrated and discharged water is oxidized. Finally, the water is introduced into the species of water celery, micro-toothed eye, bamboo leaf eye, and Shige Pu. or other aquatic plant pools for biological treatment, the final effluent COD (100mg / L), NH 3 -N (10mg / L) and pH (7.0) have reached the secondary discharge standard for petrochemical industry in the Integrated Sewage Discharge Standard (GB8978-1996).

example 3

[0029] MgSO containing COD about 900mg / L 4 High-salt and high-concentration organic wastewater is sent to the physical adsorption tank, and after removing some impurities, it is introduced into the oil-water separator. After the separation is complete, the lower layer of water is introduced into the coagulation air flotation tank, and the coagulant containing iron salt is added to settle and then aerated. After that, the water is sent to the oxidation reaction device, and the effluent enters the concentration and crystallization device. The pH value is adjusted after the concentrated and discharged water is oxidized. The ponds of aquatic plants such as Zicai and Shigepu are subjected to biological treatment, and the COD (110mg / L) and NH in the final effluent 3 -N (10mg / L), pH (7.1) values ​​reach the second-level discharge standard of petrochemical industry in the "Integrated Wastewater Discharge Standard" (GB8978-1996).

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Abstract

The invention provides a treatment process applicable to high-salinity high-concentration organic wastewater. Aiming at three types of high-salinity high-concentration organic wastewater (wherein contained salts are NH4Cl, MgCl2 and MgSO4), the invention adopts physical adsorption, oil-phase and aqueous-phase separation, coagulation and air-flotation, oxidation, concentration and crystallization, oxidation, biological treatment and a series of processes for treatment. The treatment process removes COD and NH3-N in the wastewater, ensures that the pH value of the wastewater can meet the secondary discharge standard of the petrochemical industry class in Integrated Wastewater Discharge Standard (GB8978-1996), and can recover useful salt materials, namely NH4Cl, MgCl2.6H2O and MgSO4.7H2O (content accounts for 10 to 20 percent of raw water) from the three types of wastewater. The treatment process obtains remarkable economic benefit at the same time of treating sewage, and can also be used for reducing the cost for sewage treatment. The treatment process has the advantages of low cost, high efficiency, easy operation and no secondary pollution, and is applicable to the treatment of the high-salinity high-concentration organic wastewater.

Description

technical field [0001] The invention relates to a treatment process for high-salt and high-concentration organic wastewater. Background technique [0002] Many chemical, pharmaceutical and other enterprises will produce a large amount of high-salt and high-concentration organic wastewater in the production process. These wastewater have complex chemical components, high salt content, and high concentration of organic matter. It is difficult to directly treat them with biochemical methods. Traditional wastewater treatment technologies are used It is difficult to achieve satisfactory results. Therefore, the purification treatment of this kind of wastewater is one of the hot spots in the field of environmental protection research. [0003] In view of the fact that this type of wastewater has high COD content and contains a large amount of salt, which is difficult to biodegrade, if only the conventional method of sewage treatment is used, although the organic matter can be effe...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/40C02F1/24C02F1/28C02F1/72C02F3/32
Inventor 李斌孙巧丽李恒陶辉旺
Owner YUNNAN UNIV
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