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Desulfurization wastewater treatment method and desulfurization wastewater treatment system

A technology for desulfurization wastewater and treatment method, which is applied in water/sewage treatment, heating water/sewage treatment, water/sewage multi-stage treatment, etc. The process of preprocessing, the effect of reducing the processing cost

Pending Publication Date: 2020-07-03
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The prior art provides a treatment method for desulfurization wastewater. In the pretreatment process, the magnesium ions in the desulfurization wastewater are completely removed by means of chemical precipitation. The required dosage is relatively large, resulting in higher cost of the medicament and increased processing cost

Method used

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  • Desulfurization wastewater treatment method and desulfurization wastewater treatment system
  • Desulfurization wastewater treatment method and desulfurization wastewater treatment system
  • Desulfurization wastewater treatment method and desulfurization wastewater treatment system

Examples

Experimental program
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Effect test

example 1

[0063] Such as figure 2 Shown, S02 includes first crystallization treatment and nanofiltration treatment again, namely:

[0064] (1) Carry out crystallization treatment to pretreatment effluent, obtain divalent salt crystal and crystal concentrated water;

[0065] (2) Nanofiltration treatment is performed on the concentrated crystallization water to obtain monovalent salt brine and divalent salt concentrated water.

[0066] Here, crystallization treatment is carried out to the pretreatment effluent, and divalent salt crystals (such as calcium sulfate crystals) can be obtained; nanofiltration treatment is carried out to the concentrated crystallized water obtained after crystallization treatment, that is, salt separation treatment, and monovalent salt brine and Divalent salt concentrated water (mainly magnesium ion concentrated water) for subsequent treatment.

[0067] The above-mentioned crystallization treatment may include, for example, room temperature crystallization tr...

example 2

[0081] Such as image 3 Shown, S02 includes first nanofiltration treatment recrystallization treatment, namely:

[0082] (1) Nanofiltration treatment is performed on the pretreated effluent to obtain monovalent salt brine and divalent salt brine;

[0083] (2) Carrying out crystallization treatment on divalent salt brine to obtain divalent salt crystals and concentrated divalent salt water.

[0084] Here, the pretreatment effluent is subjected to nanofiltration treatment, that is, salt separation treatment, to obtain monovalent salt brine and divalent salt brine with calcium ions and magnesium ions intercepted; crystallization treatment of divalent salt brine to obtain divalent salt crystals (such as calcium sulfate crystals) and divalent salt concentrated water (mainly magnesium ion concentrated water) for subsequent treatment.

[0085] The above-mentioned crystallization treatment may include, for example, room temperature crystallization treatment, that is, crystallization...

Embodiment

[0140] The pretreatment unit used in this embodiment includes: a reaction tank and a clarification tank; the crystallization treatment subunit is a normal temperature crystallizer; the nanofiltration treatment subunit is composed of at least one nanofiltration membrane element; the concentration treatment unit is mainly composed of an electrodialysis device and a reverse The permeation device is composed; the second separation treatment unit is an evaporative crystallizer.

[0141] The specific process is as follows:

[0142] (1) Add the desulfurization wastewater discharged from the power plant to the reaction pool at a speed of 40T / h (ton / hour), add a certain amount of calcium hydroxide to the desulfurization wastewater, so that its pH value is adjusted to 10, and add to the adjusted A flocculant is added to the desulfurization wastewater, and then the reactants in the reaction tank are transported to the clarifier tank for sedimentation to obtain pretreated effluent;

[01...

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Abstract

The invention provides a desulfurization wastewater treatment method and a desulfurization wastewater treatment system, relates to the technical field of industrial wastewater treatment, and can reduce the treatment cost. The treatment method comprises the following steps: pre-treating desulfurization wastewater to remove heavy metal ions, suspended solids and part of magnesium ions in the desulfurization wastewater so as to obtain pre-treated effluent; carrying out first separation treatment on the pre-treated effluent to obtain monovalent salt water, divalent salt crystal and divalent salt concentrated water, wherein in the first separation treatment process, when the osmotic pressure of the divalent salt concentrated water reaches a preset value, at least part of the divalent salt concentrated water is discharged; concentrating the monovalent salt water to obtain monovalent salt concentrated water and produced water; and carrying out second separation treatment on the monovalent salt concentrated water to obtain monovalent salt crystal. The method and the system of the invention are used for treatment of desulfurization wastewater.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method and system for desulfurization wastewater. Background technique [0002] With the continuous improvement of my country's economic level, the demand for industrial and domestic electricity is increasing. The existing power generation method is mainly based on coal thermal power generation. The flue gas produced by coal combustion contains a large amount of sulfur dioxide and hydrogen chloride. Most of the flue gas desulfurization systems in thermal power plants use limestone coupled gypsum (usually expressed as limestone-gypsum or limestone / gypsum) wet flue gas desulfurization process, that is, by neutralizing sulfur dioxide, hydrogen chloride and limestone in the flue gas, To remove the sulfur and chlorine elements in the flue gas; and, the calcium carbonate in the limestone reacts with sulfur dioxide and oxygen in the air to generate gy...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/06C01F11/46
CPCC01D5/06C01F11/46C02F1/001C02F1/04C02F1/44C02F1/4693C02F9/00
Inventor 陈权熊日华钟振成佟振伟程子洪段亚威于双恩霍卫东卫昶
Owner CHNA ENERGY INVESTMENT CORP LTD
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