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A kind of resource treatment method of salty wastewater

A technology for saline wastewater and treatment methods, which is applied in the field of resource treatment of saline wastewater, can solve the problems of complex control process, waste of production capacity of bipolar membrane electrodialysis equipment, etc., and achieve convenient operation control process and pretreatment work Efficiency and the effect of improving the water recovery rate

Active Publication Date: 2015-12-02
OCEAN UNIV OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Obviously, this will bring complexity to the control process of continuous operation, and also waste part of the production capacity of bipolar membrane electrodialysis equipment

Method used

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  • A kind of resource treatment method of salty wastewater

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Embodiment 1

[0019] A chemical company in Shanghai used ion exchange to desalinate surface water to produce water for production. According to long-term observation, the by-product saline wastewater contains less heavy metal ions and suspended solids. The typical 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.

[0020] The first step is preprocessing. The saline wastewater from the plant's neutralization tank is directly pumped into a conventional electrodialyzer filled with monovalent selective separation membranes (Japan, SELEMION membrane, monovalent selective positive membrane CSO and monovalent selective negative membrane ASV) . Each electrodialyzer contains 10 membrane uni...

Embodiment 2

[0024] A chemical company in Sichuan used reverse osmosis to desalinate surface water to produce water for production. According to long-term observation, the content of heavy metal ions and suspended solids in the by-product saline wastewater is relatively small, and the typical 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.

[0025] The first step is preprocessing. The waste water produced by the pure water production process is directly pumped into a conventional electrodialyzer filled with monovalent selective separation membranes (Japan, SELEMION membrane, monovalent selective positive membrane CSO and monovalent selective negative membrane ASV). Each electrodialyzer co...

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Abstract

The present invention relates to a resource treatment method of salty waste water, which is characterized in that it comprises the following steps: (1) desalting, concentrating and preliminary hard removal of salty waste water through a conventional electrodialyzer, and then dissolving the obtained low-salt waste water Return to the desalination section to prepare pure water, and the high-salt wastewater is then deeply removed by ion exchange; (2) The above-mentioned pretreated high-salt wastewater is pumped into the bipolar membrane electrodialyzer for resource treatment, accompanied by sodium chloride and With the dissociation of water, the salt content in the wastewater is greatly reduced, and hydrochloric acid and sodium hydroxide are obtained at the same time; the obtained low-salt wastewater is returned to the concentrated water chamber of conventional electrodialysis and concentrated again. The invention not only avoids the environmental pollution caused by direct discharge of high-salt wastewater, but also turns waste (salt) into treasure (acid, alkali), improves the water recovery rate of the desalinated water process, significantly reduces the cost of comprehensive water production, and realizes Both economic and social benefits are win-win.

Description

technical field [0001] The invention belongs to the field of waste water treatment and comprehensive utilization, and in particular relates to a resource treatment method for by-product saline waste water produced in desalinated water production. Background technique [0002] The ever-increasing living standards of the people and the booming industrial production development have an increasing demand for fresh water. Among them, desalination based on surface water, brackish water and seawater has become an important way to obtain fresh water. However, no matter membrane method, thermal method or ion exchange method is used to prepare desalted 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 in the discharge area, salinization of water body, damage to crops, and deterioration of the ecological environment, but also indirectly waste the relevant early stage of water inta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F9/06
CPCY02A20/124
Inventor 汪锰任庆春
Owner OCEAN UNIV OF CHINA