CN101746927A - Method for removing perchlorate in drinking water and process thereof - Google Patents
Method for removing perchlorate in drinking water and process thereof Download PDFInfo
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- CN101746927A CN101746927A CN200910231008A CN200910231008A CN101746927A CN 101746927 A CN101746927 A CN 101746927A CN 200910231008 A CN200910231008 A CN 200910231008A CN 200910231008 A CN200910231008 A CN 200910231008A CN 101746927 A CN101746927 A CN 101746927A
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- perchlorate
- water
- exchange membrane
- reaction tank
- anion
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- Y02W10/12—
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- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a method for removing perchlorate in drinking water and a process thereof. Perchlorate in the drinking water enters an anaerobic organism reaction tank into which nutritive salt and an organic carbon source are added from a water flowing channel through an anion-exchange membrane, and is reduced to chlorine and oxygen under the action of anaerobic organism denitrification. The method and the process have better removing efficiency for the perchlorate in the drinking water, wherein the removing rate of the perchlorate is up to over 95 percent, and the concentration of the perchlorate in effluent is in a range of safe concentration of between 4 and 18 mu g/L without the problems of 'secondary pollution' and 'microorganism pollution'.
Description
Technical field
The invention belongs to environmental technology field, what be specifically related to is a kind of method and technology of removing perchlorate in the tap water.
Background technology
Since nineteen ninety-seven, American National Environmental Protection Agency (EPA) has successively monitored out perchlorate in the tap water in 14 states such as California, the state of Nevada and the Utah State after, the problem of perchlorate environmental pollution has caused countries in the world environmentalists' extensive concern.Because perchlorate can disturb thyroxinic synthetic and secretion in the tap water, thereby influenced the human body normal metabolic, hinder the normal g and D of human body, therefore, perchlorate is listed in candidate pollution substance table by American National Environmental Protection Agency, and the safe concentration scope of perchlorate is 4-18 μ g/L in definite tap water.Yet because perchlorate is a kind of poisonous inorganic pollutant of non-volatile and high resolution, traditional handling technology of water supply (coagulation → precipitation → filtration → sterilization) can not be removed perchlorate in the tap water effectively.Therefore, developing guarantee perchlorate removal technology drinking water safety, efficient economy is necessary.
Up to the present, the treatment technology of perchlorate commonly used mainly contains following several: active carbon adsorption, membrane filter method, ion exchange method, anaerobic biological process.In 1997, the charcoal absorption technology at first was used for removing the research of tap water perchlorate, but gac is very little to the loading capacity of perchlorate, had limited applying of this technology.Membrane filter method can be removed the perchlorate in the tap water effectively, need handle or dispose but handle the spissated perchlorate waste water in back, and have the high shortcoming of processing cost.Ion exchange method can be removed the perchlorate in the water, but still there is following problem in actual applications: 1. many other negatively charged ion in the water (as the muriate and the vitriol of high density) meeting and perchlorate's competitive adsorption, thus the exchange efficiency of ion exchange resin is reduced; 2. perchlorate exists very strong avidity to ion exchange resin, just can make resin regeneration with the salt of high density; 3. exist the regenerated liquid processing, the disposal concerns that contain the high density perchlorate.Anaerobic biological process is meant under the anaerobic condition, by anaerobion perchlorate is reduced to muriate, and its reduction mechanism is ClO
4 -→ ClO
3 -→ ClO
2 -→ Cl
-+ O
2But, there is following shortcoming in existing anaerobic biological process in drinking water treatment: 1. because anaerobic biological treatment needs additional carbon and nutrient, do not had deliquescent carbon source and nutrient and can't remove by precipitation, filter method by what microorganism utilized, easily cause " secondary pollution " of tap water, must be by increasing the requirement that subsequent treatment process could satisfy drinking-water quality; 2. the problem that has " microbial contamination ", as the release of microbial toxin and the generation of solvability microbial metabolites, the sterilizing agent reaction with adding can generate disinfection byproduct (DBP), is detrimental to health.Therefore, solving " secondary pollution " and " microbial contamination " problem that perchlorate exists in the anaerobic biological process removal tap water is a difficult problem that needs to be resolved hurrily.Along with the fast development of membrane technique research, membrane module and bio-reactor combination process begin to be used widely in drinking water treatment.Wherein, can hold back whole microorganisms by membrane module (ultrafiltration, micro-filtration and nanofiltration), solve the problem of " microbial contamination " in the tap water basically because pressure reduction promotes membrane bioreactor.But owing to do not had deliquescent additional carbon and nutrient and some molecular compound (as deliquescent microbial metabolism by product, born of the same parents' foreign object) and can not be held back by membrane module by what microorganism utilized, effluent quality still is subjected to the influence of " secondary pollution ".This shows that it is the potential problems that cause " secondary pollution " and " microbial contamination " that microorganism directly contacts with pending tap water.
Summary of the invention
At the shortcoming that exists in the existing method of removing perchlorate in the tap water and the technology, the invention provides the method and the technology of perchlorate in a kind of new removal tap water.Its principle of work is as follows: by the Donnan dialysis process and the anaerobic biological reactor coupling of ion-exchange membrane, ClO in the tap water
4 -Enter into anaerobic biological reactor by the chosen anion exchange membrane, be reduced into harmless product C l by anaerobion
-And O
2, the Cl of generation
-Enter into tap water as the reverse drive ion by ion-exchange membrane, guaranteed that the solution of ion-exchange membrane both sides is kept electroneutral state.Because the anaerobion reactor constantly reduces the ClO that Donnan dialysis transportation is come
4 -, the Donnan equilibrium of ion-exchange membrane both sides is destroyed, strengthened ion-exchange membrane and transported ClO to anaerobic biological reactor by the Donnan dialysis
4 -Ability, improved perchlorate and removed efficient.Simultaneously, the oxygen that produces in the anaerobic biological reactor can add S-WAT by de-aerator plant and remove.
Advantage of the present invention is, 1. at ClO
4 -In anaerobe reduction removal process, the Cl of generation
-Can be directly as the reverse drive ion of Donnan dialysis process.2. solve biological process and removed " secondary pollution " and " microbial contamination " problem that perchlorate exists in the tap water.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.Wherein, the former pond of 1-; The 2-intake pump; The 3-water flow channel; The 4-anion-exchange membrane; 5-mud circulation passage; The 6-sludge circulation pump; 7-anaerobe reaction tank (UASB or ABR); The 8-whipping appts; The 9-volume pump; 10-reductor pond; The 11-volume pump; 12-organic carbon source supply pump; The 13-volume pump; 14-nutritive salt supply pool.
Embodiment
The present invention adopts the enforcement of technical scheme may further comprise the steps:
1, gets river, reservoir, the bed mud in lake and the mud of sewage work's anaerobic digester of perchlorate contaminated, it is joined in the batch culture apparatus that contains the former water of higher concentration perchlorate, by adding certain density carbon source and nutritive substance, perchlorate reduction bacterium is tamed enrichment.In cultivation and domestication process, perchlorate concentration and organic concentration change in the periodic monitor batch culture apparatus, treat that perchlorate is reduced to Cl
-And O
2Effect stability after, domestication finishes.
2, as Fig. 1, the present invention will tame good anaerobic sludge earlier and join in the anaerobe reaction tank 7, the normal operation of beginning technology.The former water that contains perchlorate moves passage 3 from former pond 1 by intake pump 2 ingoing streams.Perchlorate in the water flow channel enters into mud circulation passage 5 by anion-exchange membrane 4, enter into anaerobe reaction tank (UASB or ABR) 7 by sludge circulation pump 6, fully contact the reduction reaction that perchlorate takes place by whipping appts 8 and anaerobic sludge, generate Cl
-And O
2Volume pump 9 injects the anaerobe reaction tank with sodium sulfite solution in the reductor pond 10, makes itself and O
2React its removal.Simultaneously, volume pump 11 regularly adds competent organism (methyl alcohol or ethanol or sanitary sewage) the anaerobe reaction tank 7 from carbon source supply pool 12, and volume pump 13 regularly joins the anaerobe reaction tank with nutritive salt from nutrition supply pond 14.
The present invention is further described with following described embodiment.
Adopt that the perchlorate nitrogen concentration is 104 μ g/L in the former water, the useful volume of water flow cell and anaerobe reaction tank is respectively 63mL and 117mL, the useful area of anion-exchange membrane is 90cm
2, nutritive salt and organism adopt intermittent mode to add, and add number of times and be every day 5 times, and each time length is 2min, and addition is 2.5mL/min.Water retention time is respectively 5h and 4h in the water flow cell.As shown in table 1 through water quality after the art breading shown in Figure 1.
Change of water quality before and after table 1 embodiment handles
| Hydraulic detention time (h) | ??5 | ??4 |
| Perchlorate nitrogen concentration (μ g/L) before handling | ??104 | ??104 |
| Handle back perchlorate nitrogen concentration (μ g/L) | ??3.2 | ??4.5 |
| Perchlorate nitrogen removal efficiency (%) | ??96.9 | ??95.7 |
Claims (6)
1. a method of removing perchlorate in the tap water is characterized in that, is Cl with the Donnan dialysis process of anion-exchange membrane and anaerobion reduction perchlorate
-And O
2Process combine.
2. in accordance with the method for claim 1, wherein, maybe can give birth to the electron donor of the carbon sources such as organic waste water of degraded with simple alcohols (as methyl alcohol, ethanol) as anaerobion reduction perchlorate.
3. in accordance with the method for claim 1, wherein, perchlorate passes through the Cl of the Donnan dialysis transition process of anion-exchange membrane with the generation of anaerobion reduction perchlorate
-As the reverse drive ion.
4. technology of removing perchlorate in the tap water, it is characterized in that it mainly is made up of former pond, intake pump, water flow channel, anion-exchange membrane, mud circulation passage, sludge circulation pump, anaerobe reaction tank, whipping appts, volume pump, reductor pond, organic carbon source supply pool, nutritive salt supply pool etc.
5. according to the described technology of claim 4, it is characterized in that the mud backflow direction of water flow cell water (flow) direction and anaerobe reaction tank is in the same way or incorgruous.
6. according to the described technology of claim 4, it is characterized in that the type of anaerobe reaction tank is upflow type anaerobic bio-reactor (UASB) or baffle type anaerobic biological reactor (ABR).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910231008A CN101746927A (en) | 2009-12-11 | 2009-12-11 | Method for removing perchlorate in drinking water and process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910231008A CN101746927A (en) | 2009-12-11 | 2009-12-11 | Method for removing perchlorate in drinking water and process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101746927A true CN101746927A (en) | 2010-06-23 |
Family
ID=42474629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910231008A Pending CN101746927A (en) | 2009-12-11 | 2009-12-11 | Method for removing perchlorate in drinking water and process thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271513A (en) * | 2015-11-02 | 2016-01-27 | 湖南大学 | Methane substrate biomembrane reactor and process for removing perchlorate from drinking water |
| CN105984943A (en) * | 2016-07-04 | 2016-10-05 | 天津城建大学 | Multi-chamber fixed-bed biomembrane reactor and method for treating perchlorate in sewage using same |
| CN106748286A (en) * | 2017-02-07 | 2017-05-31 | 福建三炬生物科技股份有限公司 | A kind of biological organic fertilizer for perchlorate of degrading and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835893A (en) * | 2003-07-02 | 2006-09-20 | 贝森沃特公司 | Bio degradation of oxyanions such as perchlorate on ion exchange resins |
-
2009
- 2009-12-11 CN CN200910231008A patent/CN101746927A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835893A (en) * | 2003-07-02 | 2006-09-20 | 贝森沃特公司 | Bio degradation of oxyanions such as perchlorate on ion exchange resins |
Non-Patent Citations (1)
| Title |
|---|
| 杨丽娟: "离子交换膜生物反应器去除饮用水中硝酸盐的研究", 《CNKI优秀硕士学位论文全文库》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105271513A (en) * | 2015-11-02 | 2016-01-27 | 湖南大学 | Methane substrate biomembrane reactor and process for removing perchlorate from drinking water |
| CN105984943A (en) * | 2016-07-04 | 2016-10-05 | 天津城建大学 | Multi-chamber fixed-bed biomembrane reactor and method for treating perchlorate in sewage using same |
| CN106748286A (en) * | 2017-02-07 | 2017-05-31 | 福建三炬生物科技股份有限公司 | A kind of biological organic fertilizer for perchlorate of degrading and preparation method thereof |
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Application publication date: 20100623 |