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Method for removing chloride from power plant desulfurized wastewater

A chloride method and desulfurization wastewater technology are applied in chemical instruments and methods, water pollutants, gaseous discharge wastewater treatment, etc., which can solve the problems of high cost and energy consumption, and achieve the effect of reducing treatment costs and low energy consumption.

Active Publication Date: 2017-04-26
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the desulfurization liquid can only be discharged to become desulfurization waste liquid. The current conventional method is to soften the desulfurization waste liquid, then concentrate and then evaporate to achieve the purpose of zero discharge, but the cost and energy consumption of the whole process are very high.

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  • Method for removing chloride from power plant desulfurized wastewater

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Comparison scheme
Effect test

Embodiment 1

[0025] according to figure 1 As shown in the schematic diagram, a desulfurization waste liquid with a calcium ion content of 9000mg / L, a sulfate content of 2000mg / L, and a chloride ion content of 25000mg / L enters our power plant desulfurization wastewater dechlorination system. The desulfurization waste liquid enters the dilution tank after natural settlement and tubular filtration, and is diluted with water. The diluted desulfurization waste liquid is separated by one-bivalent separation electrodialysis, and is divided into three liquids, one is the residual liquid with a chloride content of 0.4%, which is returned to the desulfurization system; the other is calcium chloride solution, which enters the evaporation system to form Solid salt, distilled water for reuse; the last path is sodium chloride solution, which enters the bipolar membrane system. The hydrochloric acid and sodium hydroxide generated from the sodium chloride solution entering the bipolar membrane system are...

Embodiment 2

[0030] according to figure 1 As shown in the schematic diagram, a stream of desulfurization waste liquid with calcium ion content of 6000mg / L, sulfate content of 3000mg / L and chloride ion content of 22000mg / L enters our power plant desulfurization wastewater dechlorination system. The desulfurization waste liquid enters the dilution tank after natural settlement and tubular filtration, and is diluted with water. The diluted desulfurization waste liquid is separated by one-divalent separation electrodialysis, and is divided into three liquids, one is the residual liquid with a chloride content of 0.3%, which is returned to the desulfurization system; the other is calcium chloride solution, which enters the evaporation system to form Solid salt, distilled water for reuse; the last path is sodium chloride solution, which enters the bipolar membrane system. The hydrochloric acid and sodium hydroxide generated from the sodium chloride solution entering the bipolar membrane system ...

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Abstract

The invention discloses a device for removing chloride from power plant desulfurized wastewater. The device sequentially comprises a pretreatment device, an electrodialysis device and a bipolar membrane device; the pretreatment device is sequentially provided with a natural sedimentation tank, a tubular filter device and a dilution tank; the electrodialysis device comprises a bivalent cation separating device and a bivalent anion separating device; the diluted desulfurized wastewater at the outlet of the electrodialysis device is divided into three paths, the first path is the residual liquid of calcium sulfate which returns to the desulfurization system; the second path is a calcium chloride solution which is connected with an evaporation system through a pipeline; the third path is a sodium chloride solution which is connected with the inlet of the bipolar membrane device through a pipeline. The device has the advantages of being low in energy consumption, clean, environmentally friendly and efficient.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for dechlorinating desulfurization wastewater of a power plant. [0002] technical background [0003] Development, water resource issues, especially the contradiction between water resource shortage and economic and social development have been fully exposed. The average annual area affected by drought in the whole country is about 400 million mu. In a normal year, the national irrigation area suffers from a water shortage of 30 billion cubic meters per year, and cities suffer from a water shortage of 6 billion cubic meters. While water is scarce, there is still a serious waste of water. Most of the country’s agricultural irrigation water utilization coefficient is only 0.4, while many countries have reached 0.7-0.8; my country’s industrial water consumption per 10,000 yuan of output value is 103 cubic meters, which is 10 of the developed countries. ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/12C02F103/18
CPCC02F1/001C02F1/4693C02F1/4698C02F9/00C02F2001/007C02F2101/12C02F2101/308C02F2103/18
Inventor 金可勇胡鉴耿金水玉付晓靖
Owner HANGZHOU WATER TREATMENT TECH DEV CENT