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Process for deeply treating and recycling high-salinity industrial waste water

A technology for advanced treatment of industrial wastewater, applied in the field of environmental protection and comprehensive utilization of resources, can solve the problems of low concentration multiple, microbial pollution, low recovery rate, etc., and achieve the effect of prolonging the cleaning cycle and service life

Inactive Publication Date: 2012-12-05
BEIJING NEWBIOLINK TECH DEV
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Problems solved by technology

[0007] (1) Membrane fouling problem: fouling substances usually include insoluble salts, insoluble alkalis, silica, etc.
Usually, the method of adding scale inhibitors is used to prevent membrane scaling, but in high-salt wastewater, the ion concentration is very high, and the scale inhibition effect is inhibited, resulting in membrane scaling
[0008] (2) Organic matter pollution: Usually industrial wastewater contains complex organic matter systems. Even after physical, chemical and biological treatment, a certain concentration of COD still remains in the water
These remaining COD will cause organic fouling and microbial fouling of the membrane
[0009] (3) Problems of concentration ratio and concentrated water treatment: Due to the existence of the above two problems, the existing membrane technology is used for sewage treatment, and the concentration ratio is not high (low recovery rate), usually only concentrated to 4-5 times (corresponding to The recovery rate is 75-80%), the concentration ratio is low, the concentration water volume is large, and the follow-up treatment pressure is relatively high

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  • Process for deeply treating and recycling high-salinity industrial waste water

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Embodiment

[0069] A company's chemical and pharmaceutical wastewater is 1,500 tons / day, including 500 tons / day of high-concentration wastewater, 600 tons / day of low-concentration wastewater, and 400 tons / day of other wastewater.

[0070] Water quality status of high-concentration wastewater: COD Cr 25000 mg / L, B / C=0.2, NH 3 -N1500 mg / L, SS 500 mg / L, Cl - 5000 mg / L, total salt content 35000 mg / L, petroleum 370 mg / L, PH 10.

[0071] Water quality status of low-concentration wastewater: COD Cr 1000 mg / L, NH 3 -N 50 mg / L, SS 200 mg / L, full salt 1500mg / L, PH 7.

[0072] After oil separation→coagulation sedimentation→air flotation→hydrolysis→oxidation ditch→ozone oxidation→sand filtration and other processes, the actual water quality status: water temperature 25 ℃, PH9, CODcr: 150mg / L, SS≤50mg / L, NH 3 -N- 1830 mg / L, SO 4 2- 3050mg / L, total hardness 5.5mmol / L, total dissolved solids (TDS) 6500mg / L.

[0073] Now it is necessary to reuse the biochemically treated wastewater after adv...

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Abstract

The invention discloses a process for deeply treating and recycling high-salinity industrial waste water, which belongs to the technical field of environmental protection and comprehsnive resource utilization. Combined equipment is adopted, and comprises ultrafiltration equipment, ion exchange softening equipment, volume-type reverse osmosis equipment, medium-pressure flat plate reverse osmosis equipment, high-pressure flat plate reverse osmosis equipment, ultrahigh-pressure flat plate reverse osmosis equipment, high-pressure flat plate filtration equipment, secondary reverse osmosis equipment and the like. After being treated with a combined process, industrial waste water can be concentrated by 36-180 times; in combination with evaporative crystallization equipment, zero discharge of industrial waste water can be realized, and salts in industrial waste water can be recovered; and after secondary reverse osmosis treatment, produced water can be recycled by 100 percent. The process has the advantages of flexible combined process, small floor area, saving in investment, high efficiency, low running cost, stable and reliable effect, and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource comprehensive utilization, and in particular provides a high-salinity industrial wastewater advanced treatment and reuse process. Background technique [0002] my country is a country seriously short of water. The per capita fresh water resources are only 1 / 4 of the world's average level, ranking 110th in the world, and it is one of the countries with the poorest per capita water resources in the world. my country is not only seriously short of water resources, but also seriously polluted. Experts warn: "China will not find drinking water resources in 20 years." The serious shortage of water resources has seriously restricted the development of my country's economy. Therefore, it is very important to develop new wastewater treatment and reuse processes. [0003] Membrane separation technology was gradually developed in the middle and late 20th century. In the past 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCY02A20/131
Inventor 李君占王自斌
Owner BEIJING NEWBIOLINK TECH DEV
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