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Surface water desalting apparatus by-producing saline waste water treatment method

The technology of a desalination device and a treatment method is applied in the field of treatment of by-product salt-containing wastewater from desalination of surface water, which can solve the problems of high treatment cost and low treatment capacity, and achieve the effects of high treatment capacity, low treatment cost and pollution avoidance.

Active Publication Date: 2015-02-25
BEIJING LINISPLENDOUR EMPYRERL ENVIRONMENTAL ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method overcomes the problems of high processing cost and low processing capacity in the prior art; it not only turns waste (salt) into treasure (acid, alkali), but also the treated wastewater can be returned to the desalination process, reducing the water consumption of the desalination process and comprehensive production Reduce water costs, avoid environmental pollution caused by direct discharge of high-salt wastewater, and realize resource utilization of saline wastewater

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  • Surface water desalting apparatus by-producing saline waste water treatment method

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Embodiment 1

[0021] A company adopts ion exchange method to desalinate surface water to produce water for production. The content of heavy metal ions and suspended solids in the by-product saline wastewater is relatively small, and the typical main composition of the water sample is: Na + 158.48±50mmol / L, Ca 2+ 21.764±15mmol / L, Mg 2+ 7.83±5mmol / L, SO 4 2- 2.92±2mmol / L, NO 3 - 1.22±1mmol / L, Cl - 222.50±70mmol / L, silicon content (as SiO 2 meter) is 1.15±1mmol / L; alkalinity (HCO 3 - and CO 3 2- ) is 1.84±1.5mmol / L; UV 254 It is 1.857; the pH of the system is 7.10; the conductivity is 20±5ms / cm. The following methods are used to treat and recycle the saline wastewater:

[0022] The first step is preprocessing. For the water sample with the above average composition, firstly, the wastewater is pumped into the fluidized pellet reactor (the filler is garnet sand, the particle size is controlled to be 150 μm-200 μm, and the ratio of the filling height to the reactor under no flow con...

Embodiment 2

[0026] A company uses reverse osmosis to desalinate surface water to produce water for production. The content of heavy metal ions and suspended solids in the by-product saline wastewater is relatively small, and the typical main composition of the water sample is: Na + 65±15mmol / L, Ca 2+ 2.4±1mmol / L, Mg 2+ 0.5±0.3mmol / L, SO 4 2- 3.3±2mmol / L, NO 3 - 2.9±1mmol / L, Cl - 72.7±20mmol / L, silicon content (as SiO 2 meter) is 1.5±0.5mmol / L; alkalinity (HCO 3 - and CO 3 2- ) is 4.5±1.5mmol / L; UV 254 It is 1.729; the pH of the system is 7.10; the conductivity is 10.5±2ms / cm. The following methods are used to treat and recycle the saline wastewater:

[0027] The first step is preprocessing. For the water sample with the above average composition, firstly, the waste water is pumped into the fluidized pellet reactor (the filler is garnet sand, the particle size is controlled to be 220μm-260μm, and the ratio of the filling height to the reactor in the case of no flow is 1:4 Th...

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Abstract

The present invention provides a surface water desalting apparatus by-producing saline waste water treatment method. According to the surface water desalting apparatus by-producing saline waste water treatment method, saline waste water is pretreated by adopting a pure alkali-caustic soda-flocculation precipitation method to remove hard, reduce silicon and remove organic matters, and then a bipolar membrane electrodialysis device filled with a monovalent selective ion exchange membrane is adopted to carry out a resource treatment to convert the salt in the saline waste water into the corresponding acid and the corresponding alkali, wherein the acid and the alkali obtained from the electrodialysis can be used for the regeneration and pretreatment process of the desalting apparatus ion exchange resin, and the diluted saline water obtained from the electrodialysis can be used as the influent of the desalting apparatus. The method has characteristics of high treatment capacity, low treatment cost and significant reduction of the water consumption of the desalting apparatus, and is suitable for industrialization.

Description

technical field [0001] The invention relates to the field of waste water treatment and comprehensive utilization, in particular to a treatment method for by-product saline waste water from surface water desalination. Background technique [0002] With the improvement of people's living standards and the development of industrial production, the demand for fresh water resources is increasing day by day. Among them, surface water desalination has become one of the important sources of fresh water. However, no matter membrane method, thermal method or ion exchange method is used to desalinate surface water, by-product saline wastewater will be unavoidable. As we all know, the direct discharge of high-salt wastewater will not only lead to soil compaction, water salinization, damage to crops, and deterioration of the ecological environment, but also waste related inputs such as surface water desalination and treatment, and increase water production costs. [0003] Therefore, re...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F9/10
CPCY02A20/131C02F9/00C02F1/4693C02F1/5236C02F1/5245C02F1/56C02F1/66C02F5/02C02F2101/10C02F2101/30C02F2301/08C02F2303/22
Inventor 任庆春任子俊汪锰
Owner BEIJING LINISPLENDOUR EMPYRERL ENVIRONMENTAL ENG TECH
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