Method and apparatus for zero-emission treatment of desulfurization wastewater

A treatment method and desulfurization wastewater technology, which is applied in the direction of gaseous effluent wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve the problems of chemical dosing, large fluctuations in calcium and magnesium concentration, and high cost. problem, achieve the effect of reducing dosage, low price and reducing softening cost

Inactive Publication Date: 2019-06-25
CPI YUANDA ENVIRONMENTAL PROTECTION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the process of chemical treatment by double-alkali method, due to the large fluctuation of calcium and magnesium concentration in desulfurization wastewater, it is impossible to accurately add chemicals according to the water quality; moreover, the cost of sodium hydroxide and sodium carbonate is relatively high

Method used

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  • Method and apparatus for zero-emission treatment of desulfurization wastewater
  • Method and apparatus for zero-emission treatment of desulfurization wastewater
  • Method and apparatus for zero-emission treatment of desulfurization wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] Zero discharge treatment device for desulfurization wastewater, such as figure 2 shown.

[0120] Including magnesium removal reaction box 1, sedimentation box 2, coarse decalcification box 3, fine decalcification box 4, suspended matter concentration box 5, tubular ultrafiltration device 6, nanofiltration salt separation device 7, reaction Permeation device 8, MVR evaporation crystallization device 9.

[0121] Described coarse decalcification case 3 realizes Na by sodium sulfate tracer dosing device 10 2 SO 4 Accurate dosing, the fine decalcification box 4 realizes Na 2 CO 3 Accurate dosing, the tubular ultrafiltration device 6 is connected with the suspended solids concentration box 5 through a return line, and the Na 2 SO 4 The concentrated solution is connected with the sodium sulfate tracer dosing device 10 through the return line, and the settling tank 2 and the suspended matter concentration tank 5 are connected with the sludge buffer tank 12 respectively, ...

Embodiment 2

[0130] On the basis of Example 1, a zero-discharge process for desulfurization wastewater that can reduce the consumption of softening agents is also provided, and the process is specifically described as follows:

[0131] (1) The desulfurization wastewater treated by the triple box enters the magnesium removal box, and is added by adding Ca(OH) 2 Adjust the pH to above 11, the Mg in the wastewater 2+ Convert to Mg(OH) 2 The results of sedimentation, influent and effluent water quality are shown in the table below:

[0132] Table 1

[0133] water quality index

Inlet of magnesium removal reaction tank

Water out of magnesium removal reaction tank

Ca 2+ (mg / L)

7000～8000

8000～10000

Mg 2+ (mg / L)

2000～3000

0.4～2.0

SO 4 2- (mg / L)

5000～6000

5000～6000

Cl - (mg / L)

18000～20000

18000～20000

TDS(mg / L)

35000～40000

34000～39000

SS(mg / L)

50～70

28000～30000

pH

7.0

11.0～11.5 ...

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Abstract

The invention relates to the field of wastewater treatment, particularly to a method and an apparatus for zero-emission treatment of desulfurization wastewater. The method comprises: adding calcium hydroxide to desulfurization wastewater treated by a triple box, adjusting the pH value to achieve more than 11 to form magnesium hydroxide; precipitating, and removing the magnesium hydroxide and insoluble calcium hydroxide; adding sodium sulfate to generate calcium sulfate, precipitating, and removing the calcium sulfate; adding sodium carbonate to form calcium carbonate, precipitating, and removing the calcium carbonate; sequentially carrying out ultra-filtration treatment, nano-filtration salt separation treatment and reverse osmosis concentration treatment; and carrying out evaporation concentration crystallization treatment to obtain a sodium chloride crystal. The apparatus comprises a magnesium removal reaction box, a precipitation box, a coarse calcium removal box, a fine calcium removal box, a suspension concentration box, a tubular ultra-filtration device, a nano-filtration salt separation device, a reverse osmosis device, and an evaporation crystallization device, wherein thedevices are sequentially connected. With the method of the present invention, the softening cost is reduced, and the complete recycling of water resources and the production of high-quality sodium chloride can be achieved.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a zero-discharge treatment method and treatment device for desulfurization wastewater. Background technique [0002] Limestone / gypsum wet desulfurization is the most widely used flue gas desulfurization method. After the flue gas desulfurization treatment is carried out by this method, a large amount of desulfurization wastewater is produced. [0003] The water quality characteristics of desulfurization wastewater mainly include: (1) pH value 4-6.5, slightly acidic; (2) high content of suspended solids; (3) containing a variety of heavy metal ions, including a large amount of calcium, magnesium cations, chlorine, and hydrogen sulfate. Anions such as bicarbonate; (4) High content of suspended solids. [0004] Desulfurization wastewater is highly polluting and needs to be treated before being discharged into the natural environment. Moreover, with the improvement of national ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/18
Inventor 李斗刘强伍灵贾紫永秦福初荆黎许国静周怡人徐杨华
Owner CPI YUANDA ENVIRONMENTAL PROTECTION ENG
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