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Method for reducing concentration of chloride ions in wastewater

A chlorine ion concentration, waste water technology, applied in chemical instruments and methods, gaseous discharge waste water treatment, water pollutants, etc., can solve problems such as high salt content, strong volatility, and affecting ecological environment balance

Pending Publication Date: 2021-03-02
BEIJING SPC ENVIRONMENT PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Desulfurization wastewater has the characteristics of large water volume, strong volatility, and high salt content, and random discharge affects the balance of the ecological environment

Method used

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  • Method for reducing concentration of chloride ions in wastewater
  • Method for reducing concentration of chloride ions in wastewater

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0046] 1000kg of desulfurization wastewater enters the regulating tank, and the ion concentration in the wastewater is detected, CL ions are 18000mg / L, magnesium ions are 7500mg / L, and sulfate ions are 6800mg / L.

[0047] Add 126kg of calcium hydroxide solution of 5% concentration in reaction tank, reaction generates calcium sulfate precipitation, removes the sulfate radical ion in waste water. Hydroxide in calcium hydroxide solution combines with magnesium ions to form magnesium hydroxide precipitate.

[0048] Add 66 kg of 30% concentration of sodium hydroxide solution in the regulating tank, adjust the pH of the waste water to 12, and eliminate all magnesium ions.

[0049] Add 0.2kg of PAC solution of 10% concentration in waste water, PAC concentration is 10ppm in the waste water after dosing, adds 0.6kg of PAM solution of 0.2% concentration in waste water, and PAM concentration is 1ppm in the waste water after dosing. Wastewater enters the clarifier, and under the action of...

specific Embodiment 2

[0054] 1,000kg of desulfurization wastewater enters the regulating tank, and the ion concentration in the wastewater is detected, CL ions are 21,000mg / L, magnesium ions are 8,100mg / L, and sulfate ions are 7,200mg / L.

[0055] Add 133kg of calcium hydroxide solution of 5% concentration in reaction tank, reaction generates calcium sulfate precipitation, removes the sulfate radical ion in waste water. Hydroxide in calcium hydroxide solution combines with magnesium ions to form magnesium hydroxide precipitate. Add 72 kg of 30% concentration of sodium hydroxide solution in the regulating tank, adjust the wastewater pH to 12, and eliminate all magnesium ions.

[0056] Add 0.2kg of PAC solution of 10% concentration in waste water, PAC concentration is 10ppm in the waste water after dosing, adds 0.8kg of PAM solution of 0.2% concentration in waste water, and PAM concentration is 1ppm in the waste water after dosing. Wastewater enters the clarifier, and under the action of flocculants ...

specific Embodiment 3

[0060] 1000kg of desulfurization wastewater enters the regulating tank, and the ion concentration in the wastewater is detected, CL ions are 25000mg / L, magnesium ions are 10200mg / L, and sulfate ions are 7300mg / L.

[0061] Add 135kg of calcium hydroxide solution of 5% concentration in reaction pool, reaction generates calcium sulfate precipitation, removes the sulfate radical ion in waste water. Hydroxide in calcium hydroxide solution combines with magnesium ions to form magnesium hydroxide precipitate. Add 95kg of 30% concentration of sodium hydroxide solution in the regulating tank, adjust the wastewater pH to 12, and eliminate all magnesium ions.

[0062] Add 0.2kg of PAC solution of 10% concentration in waste water, PAC concentration is 10ppm in the waste water after dosing, adds 0.8kg of PAM solution of 0.2% concentration in waste water, and PAM concentration is 1ppm in the waste water after dosing. Wastewater enters the clarifier, and under the action of flocculants and ...

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Abstract

The invention relates to the field of wastewater treatment, in particular to a method for reducing the concentration of chloride ions in wastewater, which comprises the following steps that: S1, the concentration of CL ions, the concentration of sulfate radicals and the concentration of magnesium ions in wastewater of an adjusting tank are detected; S2, a calcium hydroxide solution is added, wherein the molar ratio of the adding amount of the calcium hydroxide solution to the adding amount of sulfate radicals is 1.2: 1; S3, a sodium hydroxide solution is added, and the molar ratio of the sum of the adding amount of sodium hydroxide and the adding amount of hydroxyl in the step S2 to the adding amount of magnesium ions is 2: 1; S4, PAC and PAM are added, precipitating and standing are carried out, and the wastewater overflows into a reaction box; S5, calcium hydroxide and sodium metaaluminate powder are added according to the molar ratio of CL radicals to calcium hydroxide to sodium metaaluminate being 2: 3: 2; S6, PAM and PAC are added, and then the wastewater enters a clarifier to be precipitated and stand; S7, the bottom mud in the step S4 and the bottom mud in the step S6 entera plate-and-frame filter press, and filtrate enters the adjusting tank; and S8, the overflow in the step S6 flows back to a desulfurization tower. Through the arrangement mode, the concentration of CLions in the desulfurization wastewater is reduced by utilizing a chemical reaction.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a method for reducing the chloride ion concentration in waste water. Background technique [0002] my country's main energy comes from thermal power plants, and limestone-gypsum wet flue gas desulfurization technology is currently the most widely used flue gas desulfurization technology in the world. [0003] During the desulfurization process, CL ions in the flue gas are enriched in the desulfurization slurry, which corrodes the desulfurization circulating pump and other equipment, and the slurry needs to be discharged regularly. The discharged slurry is de-gypsumed to form desulfurization wastewater. Desulfurization wastewater has the characteristics of large water volume, strong volatility, and high salt content, and random discharge affects the balance of the ecological environment. Contents of the invention [0004] In view of this, the present invention provides a m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F11/122C02F101/12C02F103/18
CPCC02F9/00C02F11/122C02F2101/12C02F2209/44C02F2103/18C02F2209/29C02F1/5281C02F2001/007C02F1/56C02F1/5236C02F1/66
Inventor 于普法王玉山吴宝刚霍玉涛赵宏彬於华
Owner BEIJING SPC ENVIRONMENT PROTECTION TECH
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