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Salt-containing wastewater treatment method and treatment system

A technology of salty wastewater and treatment methods, applied in the field of water treatment, can solve problems such as poor economic benefits, large energy consumption, and waste of water resources

Active Publication Date: 2021-05-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, such high-salt wastewater is generally treated by evaporation and crystallization, but the evaporation and crystallization process consumes a lot of energy and wastes water resources seriously, and the solid salt obtained by evaporation is only Can be treated as solid waste, cannot be recycled, and the economic benefit is poor

Method used

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  • Salt-containing wastewater treatment method and treatment system
  • Salt-containing wastewater treatment method and treatment system

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Embodiment 1

[0097] The invention provides a treatment system for saline wastewater, such as Image 6 with figure 2 As shown, it includes a nanofiltration device, a bipolar membrane electrodialysis device and an electrodialysis device; the bipolar membrane electrodialysis device includes a salt chamber and an acid chamber and an alkali chamber respectively located on both sides of the salt chamber;

[0098] The outlet of the nanofiltration device communicates with the inlet of the salt chamber, the outlet of the salt chamber communicates with the inlet of the electrodialysis device, and the concentrated solution outlet of the electrodialysis device communicates with the inlet of the salt chamber.

Embodiment 2

[0100] The invention provides a treatment system for saline wastewater, such as Figure 7 As shown, a distillation device is also included, and the outlet of the distillation device communicates with the inlet of the nanofiltration device.

Embodiment 3

[0102] This embodiment specifically uses the treatment system of Example 1 to treat dicamba saline wastewater, and the relevant parameters of dicamba saline wastewater are shown in Table 1. The specific steps include:

[0103] 1) Nanofiltration treatment

[0104] The dicamba saline wastewater to be treated was introduced into a nanofiltration device for nanofiltration treatment, and the chemical oxygen demand and divalent ion content in the dicamba saline wastewater after nanofiltration treatment were detected. The detection data are shown in Table 2.

[0105] In nanofiltration treatment, the area of ​​nanofiltration membrane is 0.01m 2, the flow rate of dicamba saline wastewater in the nanofiltration device is 300L / h, the treatment pressure is 0.6MPa, and the treatment temperature is 25°C. The nanofiltration membrane is purchased from Dow Chemical Company of the United States, and the model is NF270.

[0106] 2) Bipolar membrane electrodialysis treatment

[0107] The nanofi...

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Abstract

The invention provides a salt-containing wastewater treatment method, which comprises the following steps of: performing bipolar membrane electrodialysis treatment on salt-containing wastewater subjected to nanofiltration treatment to respectively obtain an acidic product, an alkaline product and intermediate salt-containing wastewater; and carrying out electrodialysis treatment on the intermediate salt-containing wastewater to obtain a desalted solution and a concentrated solution, and returning the concentrated solution to participate in bipolar membrane electrodialysis treatment. According to the salt-containing wastewater treatment method, efficient treatment of the salt-containing wastewater can be achieved with low energy consumption, industrial products can be obtained in the treatment process, the economic benefit of treating the salt-containing wastewater is improved, and the economic cost of treating the salt-containing wastewater is reduced.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a treatment method and system for saline wastewater. Background technique [0002] The trade names of Dicamba are Baquat and Dicamba, which are benzoic acid series hormone herbicides with internal respiratory conduction. Dicamba is resistant to oxidation at room temperature and is not easy to be decomposed. It has good stability in acid and alkali, and its decomposition temperature is about 200°C. Due to the above properties, dicamba has a strong systemic effect and a long duration of efficacy, and is widely used to control weeds in wheat, corn, millet and other crop fields. The salt content of dicamba wastewater concentrate is generally about 12% to 15%, and there is still Ca in the wastewater. 2+ , Mg 2+ , Fe 3+ 、Na + Alkali metal or alkaline earth metal ions and organic substances such as methanol and dichlorophenol. [0003] At present, such high-salt wastewater...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/442C02F1/4693C02F1/286C02F1/048C02F1/66
Inventor 王晓琳汪林林亚凯
Owner TSINGHUA UNIV
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