Recycling treatment method for salt-containing 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 wasting production capacity of bipolar membrane electrodialysis equipment and the complexity of control process, and achieve convenient operation control process and pretreatment work High efficiency and reduction of processing costs

Active Publication Date: 2014-01-15
OCEAN UNIV OF CHINA +1
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  • 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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  • Recycling treatment method for salt-containing wastewater

Examples

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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 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 + 158.48±50 mmol / L, Ca 2+ 21.764±15 mmol / L, Mg 2+ 7.83±5 mmol / L, SO 4 2- 2.92±2 mmol / L, NO 3 - 1.22±1 mmol / L, Cl - 222.50±70 mmol / L, silicon content (as SiO 2 meter) is 1.15±1 mmol / L; alkalinity (HCO 3 - and CO 3 2- ) is 1.84±1.5 mmol / L; UV 254 is 1.857; the pH of the system is 7.10; the conductivity is 20±5 ms / 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 elect...

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±15 mmol / L, Ca 2+ 2.4±1 mmol / L, Mg 2+ 0.5±0.3 mmol / L, SO 4 2- 3.3±2 mmol / L, NO 3 - 2.9±1 mmol / L, Cl - 72.7±20 mmol / L, silicon content (as SiO 2 meter) is 1.5±0.5 mmol / L; alkalinity (HCO 3 - and CO 3 2- ) is 4.5±1.5 mmol / L; UV 254 is 1.729; the pH of the system is 7.10; the conductivity is 10.5±2 ms / 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 electrodialy...

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Abstract

The invention relates to a recycling treatment method for salt-containing wastewater. The recycling treatment method is characterized by comprising the following steps: (1) carrying out desalting, concentrating and initial hard water removal on the salt-containing wastewater through a general electrodialyzer at first, returning obtained low-salt wastewater to a desalting process for preparing pure water, and carrying out deep hard water removal on high-salt wastewater through ion exchange; (2) pumping the preprocessed high-salt wastewater into a bipolar membrane electrodialyzer for recycling treatment, dissociating sodium chloride and water for greatly reducing the content of salt in the wastewater, and obtaining hydrochloric acid and sodium hydroxide at the same time; returning the obtained low-salt wastewater to a water concentration chamber of the general electrodialyzer for concentrating again. According to the recycling treatment method, the environmental pollution caused by direct discharge of the high-salt wastewater is avoided, wastes (salt) are turned into wealth (acid and alkali), the water recovery rate of a salt water removal process is increased, the integral water preparation cost is remarkably reduced, and good economic and social benefits are achieved.

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 Applications(China)
IPC IPC(8): C02F1/469C02F9/06
CPCY02A20/124
Inventor 汪锰任庆春
Owner OCEAN UNIV OF CHINA
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