Salt crystallization separation device and process capable of realizing zero emission

A zero-emission, crystallization technology, applied in chemical instruments and methods, water/sludge/sewage treatment, alkali metal halide purification, etc., can solve problems such as increased fouling tendency, secondary pollution, and limited application, and achieve mitigation pollution effect

Inactive Publication Date: 2018-04-17
国能朗新明环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single use of crystallization evaporation technology in zero discharge is not suitable for treating wastewater with high hardness, corrosiveness and volatile substances, and a strict pretreatment process is required before treatment; fluctuations in the salinity of wastewater cause fluctuations in boiling point, which leads to changes in system energy consumption; high temperature evaporation Or boiling and eva

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  • Salt crystallization separation device and process capable of realizing zero emission
  • Salt crystallization separation device and process capable of realizing zero emission
  • Salt crystallization separation device and process capable of realizing zero emission

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Embodiment 1

[0052] Embodiment 1 of the present invention, power plant desulfurization wastewater zero discharge process: desulfurization wastewater passes through the triple box reactor, and heavy metal ions such as Cr3+ and Hg2+ in the water are co-precipitated with Fe hydroxide in the form of hydroxide precipitation of metal ions, and the supernatant In the water adjustment tank, lime milk, sodium carbonate and liquid caustic soda are added to the reaction tank to react with calcium and magnesium ions in the water to form hydroxide and carbonate precipitation, and then the tubular membrane is used for solid-liquid separation to remove water Hardness ions, suspended solids, etc., the effluent is adjusted to neutral pH with hydrochloric acid and sent to the nanofiltration system to complete the separation of monovalent ions and divalent ions. The concentrated water from nanofiltration is returned to the adjustment tank, and the produced water from nanofiltration is concentrated into high-p...

Embodiment 2

[0054] Embodiment 2 of the present invention, coal chemical industry wastewater zero-discharge process: the wastewater mainly includes the drainage of each circulating water station, the drainage of the desalinated water station, and the effluent of the coal chemical industry wastewater treatment station. Firstly, it enters the regulating tank for homogeneous mass and quantity, then enters the high-efficiency clarification tank and V-type filter tank to remove alkalinity, hardness, organic colloids and inorganic colloids with small molecular weight, and then filters through the ultrafiltration device to achieve the water inlet conditions of reverse osmosis. The ultrafiltration product water enters the reverse osmosis, the recovery rate is greater than 70%, the product water can be reused for cooling tower replenishment, and the reverse osmosis concentrated water is treated with zero discharge. The reverse osmosis concentrated water first enters the nanofiltration device for sal...

Embodiment 3

[0056] Embodiment 3 of the present invention: Recycling process of high-salt wastewater: high-salt wastewater enters the regulating tank for homogenization and equalization. In the reaction tank, medicaments such as lime milk and soda ash are added to react with calcium ions in the water to generate carbonic acid. Calcium is precipitated and the pH value is controlled to prevent carbonate hydrolysis, and then the tubular membrane is used for solid-liquid separation to remove suspended solids in the water, and the effluent is adjusted to neutral pH and enters the nanofiltration system for the separation of monovalent ions and divalent ions. The water produced by nanofiltration is concentrated by the one- and two-valent selective electric drive ion membrane, and the monovalent salt is transferred to the concentrated water side. The concentration reaches more than 20% and enters the evaporation crystallizer. The heat pump of the evaporation crystallization system uses the waste hea...

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Abstract

The invention relates to a salt crystallization separation device and process capable of realizing zero emission and discloses a zero-emission treatment method and device for high-salt wastewater. Wastewater is subjected to intensified softening treatment with a tubular microfiltration membrane and then enters a special separation membrane for separation of monovalent ions and divalent ions. Further concentration is performed with a high-pressure reverse osmosis or selective permeable electric ionic membrane according to the properties of materials on a fresh water side and a concentrated water side, and the evaporation system treatment scale and scaling tendency are reduced to the maximum extent. Crystalline salt is obtained by use of a low-temperature normal-pressure crystallizer at an evaporative crystallization section, wastewater and crystalline salt are finally recycled, the investment is saved, the wastewater operation cost is significantly reduced, and zero emission of wastewater can be really realized.

Description

technical field [0001] The invention relates to a zero-discharge crystallization and salt separation treatment device and process for high-salt wastewater, and belongs to the technical field of industrial wastewater recovery and treatment. Background technique [0002] The shortage of water resources and the pollution of waste water have become worldwide problems. The requirements of my country's wastewater discharge standards are becoming increasingly stringent, especially the newly promulgated "Water Ten Measures", which raises water environmental protection to the national strategic level. With the progress of industrialization, a large amount of industrial wastewater is discharged correspondingly, which puts a lot of pressure on the environment. At the same time, it also promotes the exploration and development of zero-discharge technology for industrial wastewater by domestic environmental protection manufacturers. At present, the research and development of domestic...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/14
CPCC01D3/14C02F9/00C02F1/04C02F1/441C02F1/444C02F1/52C02F1/4693
Inventor 张征韩买良陈文婷陈雪杨东腾东玉李京红
Owner 国能朗新明环保科技有限公司
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