CN103212390A - In-situ regeneration method of trichloromethane-adsorbed saturating activated carbon - Google Patents
In-situ regeneration method of trichloromethane-adsorbed saturating activated carbon Download PDFInfo
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- CN103212390A CN103212390A CN2013101266898A CN201310126689A CN103212390A CN 103212390 A CN103212390 A CN 103212390A CN 2013101266898 A CN2013101266898 A CN 2013101266898A CN 201310126689 A CN201310126689 A CN 201310126689A CN 103212390 A CN103212390 A CN 103212390A
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Abstract
The invention belongs to the technical field of environmental protection, and particularly provides an in-situ regeneration method of trichloromethane-adsorbed saturating activated carbon. The method comprises the following steps of: synthesizing iron nanoparticle agents in an artificial way; reacting with hydrogen peroxide to obtain a high-level oxyradical and a high-level hydroxyl radical; and then quickly decomposing trichloromethane which is adsorbed to reach saturation by the activated carbon. The in-situ regeneration method is applicable to the regeneration of the activated carbon in a drinking water plant or an industrial enterprise requiring the activated carbon to treat trichloromethane. Compared with the conventional regeneration method, the in-situ regeneration method provided by the invention is low in cost, less in pollution, simple in technology, and wide in economic benefit and application prospect.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to the method for iron nano-particle catalysis hydrogen peroxide regeneration chloroform absorption saturated activity charcoal.
Background technology
Continue under the background of aggravation in current water pollution both at home and abroad, active carbon has been widely used in the drinking water deep treatment process process as a kind of efficient sorbing material.Active carbon can be removed multiple different organic pollution effectively from water body, but constantly reach organic matter absorption saturation state through the long-term active carbon that uses, replacing in time or regeneration conduct a research both at home and abroad with assurance water treatment effect regeneration method of active carbon and use, and mainly are divided three classes: bioanalysis, heating and chemical method.The bio-regeneration of active carbon, the present also less report that success is arranged of seeing, its major defect is that bioanalysis only is applicable to biodegradable polluter, for easily biological-degradable and toxic organics then can not be suitable for, and residual end product is adsorbed on activated carbon surface, and regeneration not exclusively; High temperature thermal regeneration method is huge to the active carbon loss, and permissive waste is higher than 10%, and freight is high.Adopt the method to carry out the saturated active carbon of in-situ regeneration chloroform absorption, do not need the transfer activity charcoal to special container, active carbon after regeneration is reused, cost is little, pollution-free, the activated carbon adsorptive capacity loss is very little, so this research very meets the requirement of China's high efficiency, low cost, resource in environmental pollution improvement.
Active carbon is easy to chloroform absorption in the water saturated in the drinking water treatment technology.Extensive use chlorine carries out pre-oxidation in the drinking water treatment, because the existence of organic pollution, the oxychloride process can inevitably produce chlorinated secondary product, and chloroform is the highest material of concentration in the various chlorinated secondary products.Chloroform content must not surpass 80 μ g/L in China's regulation drinking water, and Environmental Protection Agency (USEPA) regulation chloroform maximum permissible value is 80 μ g/L, and is tending towards strict more.Verified, active carbon has good absorption removal effect most to chloroform, and in nearly all chlorinated secondary product, chloroform is the easiest to be saturated by charcoal absorption, in case charcoal absorption is saturated, its result can cause output water chloroform concentration over-standard.Therefore, keeping active carbon is very important to the lasting characterization of adsorption of chloroform, and the saturated activated carbon process of in-situ regeneration chloroform absorption influences water factory's normal water supply hardly, is extremely important.
Summary of the invention
The object of the present invention is to provide the saturated process of active carbon of a kind of efficient, economic, free of contamination in-situ regeneration chloroform absorption.
The present invention synthesizes iron nano-particle reagent with manual method, by producing the advanced oxidation hydroxyl free radical with the hydrogen peroxide reaction, the degrading activity charcoal adsorbs saturated chloroform fast, and the present invention can be applicable to drinking water plant maybe to be needed to carry out active carbon regeneration with the industrial enterprise of charcoal treatment chloroform.
The saturated process of active carbon of in-situ regeneration chloroform absorption provided by the invention, concrete steps are:
The first step: preparation iron nano-particle reagent, adopt nanopure water to dissolve six water and iron chloride (FeCl
36H
2O), mix more than 4 days, preparation high concentration iron nano-particle reagent is as stoste, and stoste can be diluted with nanopure water as required, and the iron nano-particle diameter needs at 40-50nm;
Second step: with through being diluted to the saturated activated carbon sample of the dynamic upward flow drip washing of iron nano-particle reagent chloroform absorption of specific concentrations, collect leacheate, repeat drip washing 4-5 time;
The 3rd step: the 70% hydrogen peroxide upward flow mode that adds in proportion contacts regeneration with the saturated activity charcoal, and pH is 2.4-2.7 with hydrochloric acid control reactor, repeats drip washing 4-5 time;
The 4th step: stop drip washing, left standstill 30--40 minute; Discharge the regeneration leacheate, active carbon is 2-3 time after regenerating with the clear water flushing, and regeneration is finished.
The present invention is based on the basic principle of hydroxyl free radical advanced oxidation:
1. the iron nano-particle reagent of artificial preparation is to have the special diameter scope, can directly be adsorbed to activated carbon capillary inside by the saturated activity charcoal;
2. the iron nano-particle and the hydrogen peroxide that enter micropore inside react, and generate hydroxyl free radical, divide desorption saturated chloroform from active carbon inside to external oxidation, reach active carbon regeneration purpose.
Characteristics of the present invention are: with six Ferric Chloride Hydrateds is iron nano-particle reagent raw material, and as catalysts, this reagent is easy to by the saturated charcoal absorption of chloroform absorption owing to have specific diameter range through artificial preparation iron nano-particle reagent; After active carbon fully adsorbed iron nano-particle, reagent reacted in the hydrogen peroxide of follow-up interpolation again, generated the hydroxyl free radical material, this material has strong oxidizing property, can effectively decompose the saturated chloroform of absorption activated carbon, the regeneration afterproduct is nontoxic, and is easy to clean removal by water.The method is obvious to the saturated active carbon regeneration effect of chloroform absorption; compare with existing thermolysis process; cost is little, pollute less, technology is simple; do not need the transfer activity charcoal to specific regeneration factory and regenerating unit; can realize in-situ regeneration; be fit to the daily active carbon regeneration of drinking water plant and use, meet the requirement of China's high efficiency, low cost, resource in environmental pollution improvement.
The invention has the beneficial effects as follows:
The present invention is a catalyst with the iron nano-particle reagent of artificial preparation, produce hydroxyl free radical with hydrogen peroxide generation chemical reaction, hydroxyl free radical has the usefulness of quick decomposition chloroform, can be applicable to the regeneration of drinking water plant active carbon disposes, compare with the conventional regeneration mode, cost is little, pollute less, technology is simple, has economic benefit and application prospect widely.
The specific embodiment
The invention is further illustrated by the following examples.
Embodiment 1
Certain drinking water plant adopts coal mass active carbon as the chloroform adsorption treatment process, through operation in 2 years, active carbon obviously reduces the removal effect of chloroform, 95% chloroform clearance is reduced to the chloroform clearance about 10% when using from the initial stage, and it is saturated to think that this active carbon has approached chloroform absorption.The content of organics characterization parameter COD mean value of the former water of activated carbon process run duration is 5.4mg/L, the highest 6.9mg/L, minimum 4.5mg/L, seasonal variations is not obvious, water factory adopts the prechlorination mode to carry out pre-oxidation, and the chloroform content of generation is 100-200 μ g/L.Former water belongs to middle severe organic polluted-water.
Getting an amount of absorption saturated activity charcoal takes out, put into the preprepared regeneration reactor, reactor diameter is 30cm, the right circular cylinder of height 60m, water inlet and delivery port are set, adopt the regeneration of upward flow, after step regeneration, get activated carbon sample analysis, leading indicator chloroform adsorption efficiency.
Can draw to draw a conclusion by experimental study: after regenerating active carbon to the removal efficient of chloroform near under the saturation state 10%, return to about 70%, behind the activated carbon filtration, chloroform content is reduced to 30-60 μ g/L from the 100-200 μ g/L of water inlet after regenerating.After follow-up sterilization, output water chloroform content is lower than the drinking water output water standard of national regulation.
Embodiment 2
Certain enterprise makes barreled pure water, adopts oxychloride technology in conjunction with activated carbon filtration, and through operation in 5 years, active carbon obviously reduced the organic matter adsorption efficiency, and the clearance of chloroform about 90% is reduced to 35% under the original state.This enterprise is the water source with the running water, running water is after chlorination once more, chloroform content is about 100 μ g/L, through after charcoal absorption, still can satisfy the national standard requirement of 80 μ g/L, the general who has surrendered causes output water defective but charcoal absorption efficient is if continue down, therefore carries out the active carbon regeneration test.
Regenerative process inserts the active carbon filter tank with reclaim equiment, the bottom water inlet, and the upward flow mode of top water outlet is constantly taken out activated carbon sample and is analyzed in the process of the test, and leading indicator is included as chloroform and removes efficient.Can draw to draw a conclusion by experimental study: the saturated activity charcoal was through 3 hours regeneration, the chloroform adsorption efficiency returns to about 70% from 35%, according to China " water quality standard for drinking water ", the charcoal treatment water chloroform content after the regeneration is far below national standard.
Reference examples
Certain laboratory is adopted and is carried out test without used active carbon, and active carbon is soaked and drip washing with the chloroform highly concentrated solution, and it is saturated to make active carbon reach chloroform absorption, adsorbs saturated active carbon and carries out regeneration test.Test is carried out in special container, diameter 30cm, and high 60cm, the regeneration of upward flow after regeneration, is got activated carbon sample analysis, and activated carbon sample returns to 84% to the adsorption efficiency of chloroform from 10%.
Claims (1)
1. the method for an in-situ regeneration chloroform absorption saturated activity charcoal is characterized in that comprising the steps:
The first step: preparation iron nano-particle reagent, adopt nanopure water to dissolve six water and iron chloride, mix more than 4 days, preparation high concentration iron nano-particle reagent is as stoste, and stoste is diluted with nanopure water as required, and the iron nano-particle diameter is at 40-50nm;
Second step: with through being diluted to the saturated activated carbon sample of the dynamic upward flow drip washing of iron nano-particle reagent chloroform absorption of specific concentrations, collect leacheate, repeat drip washing 4-5 time;
The 3rd step: the 70% hydrogen peroxide upward flow mode that adds in proportion contacts regeneration with the saturated activity charcoal, and pH is 2.4-2.7 with hydrochloric acid control reactor, repeats drip washing 4-5 time;
The 4th step: stop drip washing, left standstill 30--40 minute; Discharge the regeneration leacheate, active carbon is 2-3 time after regenerating with the clear water flushing, and regeneration is finished.
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| CN201310126689.8A CN103212390B (en) | 2013-04-12 | 2013-04-12 | In-situ regeneration method of trichloromethane-adsorbed saturating activated carbon |
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| CN201310126689.8A CN103212390B (en) | 2013-04-12 | 2013-04-12 | In-situ regeneration method of trichloromethane-adsorbed saturating activated carbon |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714962A (en) * | 2014-08-11 | 2017-05-24 | 奥维沃股份有限公司 | Method for in-situ regeneration of activated carbon loaded with trihalomethanes using alkaline hydrolysis |
| CN115805057A (en) * | 2022-11-29 | 2023-03-17 | 南京誉鼎环境科技有限公司 | Active carbon in-situ adsorption regeneration method applied to high-concentration degradation-resistant wastewater treatment |
Citations (5)
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| US5702587A (en) * | 1996-12-20 | 1997-12-30 | Huron Tech Canada, Inc. | Chemical and electrochemical regeneration of active carbon |
| CN101215016A (en) * | 2008-01-11 | 2008-07-09 | 浙江理工大学 | Method for treating organic waste water |
| CN102276082A (en) * | 2011-06-12 | 2011-12-14 | 南昌航空大学 | Treatment method of high-salinity organic wastewater |
| CN102658101A (en) * | 2012-04-19 | 2012-09-12 | 东华大学 | Regeneration method for activated carbon adsorbed and saturated by refractory organics |
| CN102755875A (en) * | 2012-07-04 | 2012-10-31 | 浙江工商大学 | Regenerating method of activated carbon after absorbing organic matters |
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2013
- 2013-04-12 CN CN201310126689.8A patent/CN103212390B/en not_active Expired - Fee Related
Patent Citations (5)
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| US5702587A (en) * | 1996-12-20 | 1997-12-30 | Huron Tech Canada, Inc. | Chemical and electrochemical regeneration of active carbon |
| CN101215016A (en) * | 2008-01-11 | 2008-07-09 | 浙江理工大学 | Method for treating organic waste water |
| CN102276082A (en) * | 2011-06-12 | 2011-12-14 | 南昌航空大学 | Treatment method of high-salinity organic wastewater |
| CN102658101A (en) * | 2012-04-19 | 2012-09-12 | 东华大学 | Regeneration method for activated carbon adsorbed and saturated by refractory organics |
| CN102755875A (en) * | 2012-07-04 | 2012-10-31 | 浙江工商大学 | Regenerating method of activated carbon after absorbing organic matters |
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| J.TORRES-PÉREZ等: "Sorption and Desorption of Dye Remazol Yellow onto a Mexican Surfactant-modified Clinoptilolite-rich Tuff and a Carbonaceous Material from Pyrolysis of Sewage Sludge", 《WATER AIR SOIL POLLUT》, vol. 187, 16 October 2007 (2007-10-16), XP019557896, DOI: doi:10.1007/s11270-007-9518-6 * |
| LUCIANA CÁASSIA TOLEDO等: "Application of Fenton’s reagent to regenerate activated carbon saturated with organochloro compounds", 《CHEMOSPHERE》, vol. 50, 31 December 2003 (2003-12-31) * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714962A (en) * | 2014-08-11 | 2017-05-24 | 奥维沃股份有限公司 | Method for in-situ regeneration of activated carbon loaded with trihalomethanes using alkaline hydrolysis |
| CN106714962B (en) * | 2014-08-11 | 2020-06-23 | 奥维沃股份有限公司 | Method for in-situ regeneration of active carbon loaded with trihalomethane by alkaline hydrolysis |
| CN115805057A (en) * | 2022-11-29 | 2023-03-17 | 南京誉鼎环境科技有限公司 | Active carbon in-situ adsorption regeneration method applied to high-concentration degradation-resistant wastewater treatment |
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