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Treatment method for wastewater produced during flue gas desulphurization through alcohol-amine process

A treatment method, the technology of the alcohol amine method, is applied in the direction of gaseous effluent wastewater treatment, neutralization water/sewage treatment, adsorption water/sewage treatment, etc., to achieve the effect of mild reaction conditions, good treatment effect, and rapid solid-liquid separation

Inactive Publication Date: 2013-06-19
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fenton oxidation can be used as a treatment method alone to oxidize organic wastewater in wastewater treatment, and can also be combined with other methods to produce economical and efficient combined technologies, such as coagulation sedimentation-Fenton oxidation method, activated carbon adsorption-Fenton oxidation method, Resin adsorption-Fenton oxidation method, etc., but the use of Fenton oxidation method to treat the wastewater produced in the process of alcohol amine flue gas desulfurization has not been reported

Method used

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  • Treatment method for wastewater produced during flue gas desulphurization through alcohol-amine process
  • Treatment method for wastewater produced during flue gas desulphurization through alcohol-amine process
  • Treatment method for wastewater produced during flue gas desulphurization through alcohol-amine process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 250ml of simulated wastewater into a 500ml beaker, the initial COD of the wastewater is 6000mg / L, add 1.25g of different types of bentonite (natural sodium bentonite, roasted modified sodium bentonite, cross-linked modified sodium bentonite, organically modified sodium bentonite respectively) base bentonite), stirred and reacted at 200rpm at 30°C for 1h, after natural settlement for 30min, poured out the supernatant, and analyzed COD, the results were as follows figure 1 As shown in the figure, 1 is natural sodium bentonite, 2 is roasted modified sodium bentonite, 3 is crosslinked modified sodium bentonite, and 4 is organically modified sodium bentonite. As can be seen from the figure, natural sodium bentonite, Calcined modified sodium bentonite and cross-linked modified sodium bentonite have the same effect on wastewater treatment, while organically modified sodium bentonite has poor treatment effect. Natural sodium bentonite is preferred in terms of economy and eas...

Embodiment 2

[0031] Add 250ml simulated wastewater into a 500ml beaker, the initial COD of the wastewater is 6000mg / L, add 1.25~10g (according to figure 2 Concentration gradient in) natural sodium-based bentonite, stirred and reacted at 200rpm at 30°C for 1h, after natural sedimentation for 30min, poured out the supernatant, analyzed COD, and the results were as follows figure 2 As shown, it can be seen from the figure that the COD removal rate of wastewater increases with the increase of the amount of bentonite added. When the amount of bentonite added is above 25g / L, the COD removal rate of more than 50% can be achieved, and at this time the addition of bentonite is increased. The increase of volume COD removal rate gradually tends to be slow. Simultaneously, too much addition of bentonite will lead to poor settling properties and make it difficult to separate soil and water, so 25g / L is selected as the addition amount in the following examples.

Embodiment 3

[0033] Add 2L of simulated wastewater into a 3L beaker, the initial COD of the wastewater is 6000mg / L, add 50g of natural sodium bentonite, stir and react at 200rpm at 30°C for 1h, after natural settlement for 30min, pour out the supernatant; Add the supernatant liquid absorbed by natural sodium bentonite into a 500ml beaker, and add 30% H 2 o 2 (that is, add when t=0, t=1h, add half each time), press n(H 2 o 2 ):n(Fe 2+ )=10:1 adding FeSO 4 ·7H 2 O (added at t=0), stirred and reacted at 200rpm at 30°C for 2h, filtered and took the clear liquid to analyze COD, the results were as follows image 3 As shown, it can be seen from the figure that H 2 o 2 The amount of addition has a great influence on the treatment effect, and the removal rate of COD in wastewater increases with H 2 o 2 The amount of addition increases, when H 2 o 2 When the addition amount is 0.3mol / L, the COD removal rate reaches a maximum of 95%, and will not increase thereafter, so 0.3mol / L is select...

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Abstract

The invention discloses a treatment method for wastewater produced during flue gas desulphurization through an alcohol-amine process, belonging to the field of wastewater treatment. The treatment method comprises the steps of: 1) taking wastewater, regulating pH value to 5.5-6.5, adding bentonite, agitating for reaction, settling, separating and taking supernatant liquor; and 2) taking the supernatant liquor obtained in the step 1, adding Fenton reagent, agitating for reaction for 2-2.5h and filtering. The treatment method is used for treating wastewater with high alcohol-amine concentration produced during the flue gas desulphurization through the alcohol-amine process, and has the advantages that the treatment efficiency is high, the application scope is wide, the chemical oxygen demand(COD) of the treated wastewater is obviously decreased and the treated wastewater can enter biochemical treatment devices for common production wastewater or urban wastewater.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a method for treating waste water produced in the alcohol amine flue gas desulfurization process. Background technique [0002] Alcohol amine desulfurization is widely used in natural gas and refinery gas desulfurization process, and it is a typical absorption-regeneration reaction process using alcohol amine as absorbent. The waste amine liquid mainly comes from the following aspects: ① The thermal degradation of the amine liquid, the absorption capacity of the amine liquid is reduced after chemical degradation, which cannot meet the production needs and is replaced out of the system; ② The amine liquid polluted by hydrocarbons has a greater impact on the sulfur processing equipment Large and forced to discharge the system; ③The amine liquid discharged from the system cannot be reused when the device is shut down. The waste amine liquid produced is mainly composed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F1/66C02F1/42C02F1/28C02F1/72C02F103/18
Inventor 周觅莫建松程常杰夏纯洁
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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