CN106315848A - Method for synchronously removing nitrate and arsenic in underground water by natural pyrrhotite and application of method - Google Patents
Method for synchronously removing nitrate and arsenic in underground water by natural pyrrhotite and application of method Download PDFInfo
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- CN106315848A CN106315848A CN201611012006.6A CN201611012006A CN106315848A CN 106315848 A CN106315848 A CN 106315848A CN 201611012006 A CN201611012006 A CN 201611012006A CN 106315848 A CN106315848 A CN 106315848A
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- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 70
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910001868 water Inorganic materials 0.000 title claims abstract description 49
- 229910002651 NO3 Inorganic materials 0.000 title claims abstract description 48
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 229910052952 pyrrhotite Inorganic materials 0.000 title abstract 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000011593 sulfur Substances 0.000 claims abstract description 34
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 34
- 241000894006 Bacteria Species 0.000 claims abstract description 27
- 230000001651 autotrophic effect Effects 0.000 claims abstract description 22
- 238000012216 screening Methods 0.000 claims abstract description 22
- 239000010865 sewage Substances 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000005554 pickling Methods 0.000 claims abstract description 7
- 239000010802 sludge Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 128
- 229910052742 iron Inorganic materials 0.000 claims description 57
- 239000003673 groundwater Substances 0.000 claims description 26
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 14
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 8
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 8
- 239000001963 growth medium Substances 0.000 claims description 8
- 229910000402 monopotassium phosphate Inorganic materials 0.000 claims description 7
- 230000001580 bacterial effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 230000009514 concussion Effects 0.000 claims description 5
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 4
- 239000007836 KH2PO4 Substances 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- 229910052603 melanterite Inorganic materials 0.000 claims description 4
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 claims description 4
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 2
- 239000002054 inoculum Substances 0.000 claims description 2
- 238000002255 vaccination Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 3
- 230000002829 reductive effect Effects 0.000 abstract description 2
- 239000002253 acid Substances 0.000 abstract 1
- 238000009388 chemical precipitation Methods 0.000 abstract 1
- 230000007935 neutral effect Effects 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 20
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 238000012545 processing Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000012153 distilled water Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 235000019796 monopotassium phosphate Nutrition 0.000 description 3
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 3
- 239000004323 potassium nitrate Substances 0.000 description 3
- 235000010333 potassium nitrate Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000006701 autoxidation reaction Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011953 bioanalysis Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000701 coagulant Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011081 inoculation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- -1 mispickel) Chemical class 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- WBQCYHBKOHGNQI-UHFFFAOYSA-N [N].[As] Chemical compound [N].[As] WBQCYHBKOHGNQI-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- FGIWMSAVEQNPPQ-UHFFFAOYSA-N arsenic;hydrate Chemical compound O.[As] FGIWMSAVEQNPPQ-UHFFFAOYSA-N 0.000 description 1
- MJLGNAGLHAQFHV-UHFFFAOYSA-N arsenopyrite Chemical compound [S-2].[Fe+3].[As-] MJLGNAGLHAQFHV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 239000003403 water pollutant Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Removal Of Specific Substances (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a method for synchronously removing nitrate and arsenic in underground water by natural pyrrhotite and an application of the method, and belongs to the technical field of water resource purification. The method includes the steps: (a) material preparation: crushing the natural pyrrhotite into particles and washing the particles into neutral with water after acid pickling; (b) strain screening: screening sulfur-based autotrophic denitrification bacteria taking the natural pyrrhotite as a sulfur source from anaerobic sludge by a specific screening medium to serve as a target strain; (c) sewage treatment: taking the underground water containing the nitrate and the arsenic, inoculating the target strain and then placing the underground water in a reactor containing the natural pyrrhotite for reaction; (d) solid-liquid separation. The natural pyrrhotite is used as the sulfur source of the sulfur-based autotrophic denitrification bacteria for denitrification, the nitrate in the water is transformed into nitrogen in a reductive manner, the pyrrhotite and oxidation product thereof can remove the arsenic in the water by the aid of functions such as chemical precipitation and adsorption, so that the nitrate and the arsenic in the underground water are synchronously and efficiently removed. The method is convenient in operation and low in cost.
Description
Technical field
The invention belongs to water resource purification techniques field, more particularly, it relates to one utilizes natural magnetic iron ore to synchronize
Remove nitrate in groundwater and the method for arsenic and application thereof.
Background technology
The substantial amounts of nitrogen application of agricultural can cause the large-scale nitrate of subsoil water and arsenic plus special geologic(al) factor
Combined pollution, causes huge threat to local resident's safe drinking water.The combined pollution of groundwater azotate and arsenic is in China
Be particularly acute, according to pertinent literature, the subsoil water in the cities such as Tianjin, Harbin, Xi'an, Changchun generally exists nitrate and
The pollution of arsenic.At present, the removal to nitrate in water and arsenic is carried out the most respectively, not yet have while maturation nitrate and
The method that arsenic is removed, processes two kinds of pollutant respectively and not only can roll up cost handling process also can be made to become loaded down with trivial details, so
Effectively, inexpensively, technology is to process nitrate in groundwater and the Main way of arsenic Pollution Study at present easily.
The minimizing technology of nitrate in groundwater is divided into Physical, chemical method and bioanalysis, and Physical and chemical method are thrown
Money and operation cost are the highest, and for huge groundwater treatment amount, application is limited by bigger；Biological heterotrophic denitrification takes off
Nitrogen technology, although treatment effect is preferable, but it is faced with the cost rising that subsoil water carbon source deficiency needs additional carbon to cause, it is easily formed
Secondary pollution problems.Subsoil water arsenic removal process mainly has coagulant sedimentation, ion exchange, bioanalysis, membrane separation process and suction
Attached method etc., and in view of the reason such as cost of investment and technical stability, apply in commercial production and process Drinking Water at present
The most ripe dearsenicating method or coagulant sedimentation.
Autotrophic denitrification bacterium generally exists in the anaerobic environment such as subsoil water and deposit sulfur, and it can be under anaerobic
With reduced sulfur (S2-、S0、S2O3 2-Deng) it is electron donor, carry out autotrophic denitrification with nitrate for electron acceptor, by water
Nitrate reduction is nitrogen.Sulfur autotrophic denitrification bacterium can be with natural magnetic iron ore (Fe(1-X)S) it is that sulfur source carries out the anti-nitre of autotrophy
Change and remove nitrate, but the research currently with natural magnetic iron ore synchronization removal nitrate in groundwater and arsenic yet there are no report
Road.
(patent application that Chinese patent " utilizes arsenic and the method for nitrate in anaerobic ferrite oxidization, denitrifying bacterium purification sewage "
Number: 201310070136.5) disclose and utilize anaerobic ferrite oxidization, denitrifying bacterium to synchronize to remove arsenic and the method for nitrate in water.
The method utilizes ferrum oxidation denitrifying bacterium with Fe2+Denitrification is carried out, the Fe of generation for electron donor3+The adsorbable arsenic of oxide
Characteristic reaches the purpose of simultaneous denitrification arsenic removal.But the clearance of the method nitrogen arsenic is unsatisfactory, at Fe2+Under the conditions of Chong Fen instead
Answer 30d, the removal efficiency of nitrate and arsenic is only had 30%-70% and 40%-70%；Additionally react all occurring at solution
In, it is difficult to run continuously and separate with bacterium solution；Need additional carbon, be likely to result in out water pollutant and exceed standard；Practicality is poor.
Summary of the invention
Problem to be solved
Have for the Groundwater Treatment Methods of existing nitrate and arsenic combined pollution that step-by-step processing is with high costs, technique is multiple
Miscellaneous, the problems such as treatment effect is undesirable, an object of the present invention is to provide one and utilizes natural magnetic iron ore to synchronize removably
Nitrate and the method for arsenic in lower water, sulfur autotrophic denitrification bacterium utilizes natural magnetic iron ore to carry out denitrification as sulfur source and removes water
In nitrate；The biooxidation products Fe of magnetic iron ore2+、Fe3+The arsenic in water can be removed by precipitation.
2. technical scheme
In order to solve the problems referred to above, the technical solution adopted in the present invention is as follows:
A kind of utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and the method for arsenic, comprise the following steps:
A () material prepares: magnetic iron ore is broken into granule, and rinsing to pH with water after pickling is that neutrality is to remove mineral again
The oxide on surface and other pollutant, standby；
(b) bacterial screening: utilize specific screening culture medium to filter out from anaerobic sludge with natural magnetic iron ore as sulfur
The sulfur autotrophic denitrification bacterium in source is as target strain；
C () sewage disposal: take the subsoil water containing nitrate and arsenic, vaccination target strain is placed in reactor, then adds
Fully react after the concussion of a certain amount of magnetic iron ore；
(d) solid-liquid separation: reacted mixed liquor is staticly settled, discharge after supernatant detection is up to standard.
Further, the magnetic iron ore used in step (a) is natural magnetic iron ore, broken particle diameter 0.1-20mm it
Between.
Further, the screening training of the sulfur autotrophic denitrification bacterium that screening is sulfur source with natural magnetic iron ore in step (b)
Main component and the concentration of supporting base are respectively NaS2O3·5H2O 5g/L、KNO3 2g/L、KH2PO4 2g/L、NaHCO3 1g/L、
MgCl2·6H2O 0.5g/L、NH4Cl 0.5g/L、FeSO4·7H2O 0.01g/L。
Further, in step (c), the inoculum concentration of target strain is the 5～10% for the treatment of sewage volume.
Further, in step (c), the dosage of magnetic iron ore is 100～250g/L, after i.e. adding magnetic iron ore, instead
The concentration answering the magnetic iron ore in system is 100～250g/L.
Further, the optimal reactive temperature in step (c) is 15～30 DEG C.
Further, the response time in step (c) is 5～15d.
Further, the reaction pH scope in step (c) is between 6～8.
A kind of above-mentioned method utilizing natural magnetic iron ore to synchronize to remove nitrate in groundwater and arsenic is clean at subsoil water
Application in change field.
The principle of the present invention is: sulfur autotrophic denitrification bacterium utilizes natural magnetic iron ore to carry out denitrification as sulfur source and removes water
In nitrate；The biooxidation products Fe of magnetic iron ore2+、Fe3+The arsenic in water, Fe can be removed by precipitation2+、Fe3+
Hydroxide such as Fe (OH) in amorphous state3Arsenic is also had the strongest Adsorption effect；Finally achieve biological denitrificaion
With the coupling naturally of Removal of arsenic by chemical method, wherein sulfur autotrophic denitrification bacterium utilizes magnetic iron ore to carry out the equation of autotrophic denitrification reaction
As follows:
3. beneficial effect
Compared to prior art, the invention have the benefit that
(1) the invention provides and a kind of utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and the method for arsenic,
The Fe (OH) of the amorphous state that sulfur autotrophic denitrification bacterium oxidation magnetic iron ore produces3Arsenic is had the strongest Adsorption effect, far
It is better than magnetic iron ore itself or the autoxidation removal effect to arsenic, it is achieved that to low ratio of carbon to ammonium subsoil water biological denitrificaion and chemistry
Naturally the coupling of arsenic removal；
(2) present invention achieves the synchronization to nitrate in groundwater and arsenic to remove, applied widely, processing speed is fast,
Removal efficiency is high and without additional carbon；
(3) present invention is used natural magnetic iron ore wide material sources, cheap, or discarding after many minings
Ore, easily produces acidic mine waste water, and the present invention is by discarded natural crystal recycling, serve resource reclaim and
Avoid the effect polluted；
(4) growth rate of target strain of present invention screening own is fast, and suitable growth temperature is extensive, adheres to natural magnetic Huang ferrum
When on ore deposit being removed the nitrate in water and arsenic, denitrification rate is fast, without added regent, bacterium solution good separating effect, can
To run continuously, applicable elements extensive；
(5) present invention processes subsoil water low cost, high treating effect, it is easy to through engineering approaches is applied.
Accompanying drawing explanation
Fig. 1 is the effect processing artificial distribution's simultaneous denitrification arsenic removal in the embodiment of the present invention 1；
Fig. 2 is the effect processing artificial distribution's simultaneous denitrification arsenic removal in the embodiment of the present invention 2；
Fig. 3 is the effect processing artificial distribution's simultaneous denitrification arsenic removal in the embodiment of the present invention 3；
Fig. 4 is the effect processing certain city's subsoil water simultaneous denitrification arsenic removal in the embodiment of the present invention 4.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described below.
Embodiment 1
A kind of utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and the method for arsenic, its process to as if by from
The artificial distribution that water, potassium nitrate, potassium dihydrogen phosphate are formulated, the steps include:
A () material prepares: be respectively the natural magnetic iron ore of 58% and 39% crush originating from Tongling, Anhui Province ferrum sulfur content
To 80～100 mesh, after pickling again with the pH value of distilled water flushing to water outlet between 6～8, then at the vacuum drying oven of 30 DEG C
Interior dry for standby；
(b) bacterial screening: utilize screening culture medium to screen from Nanjing Yangzi petrifaction sewage factory UASB technique anaerobic sludge
Sulfur autotrophic denitrification bacterium is as target strain；Main component and the concentration of screening culture medium are respectively NaS2O3·5H2O 5g/L、
KNO3 2g/L、KH2PO4 2g/L、NaHCO3 1g/L、MgCl2·6H2O 0.5g/L、NH4Cl 0.5g/L、FeSO4·7H2O
0.01g/L。
(c) sewage disposal: the initial concentration taking nitrate nitrogen and arsenic is respectively the water distribution of 34.9mg/L, 27.3mg/L, connects
The target strain of kind of 7% (v/v) is in reactor, then adds after the natural magnetic iron ore concussion that concentration is 230g/L at 27 DEG C
Reaction 13d；The reactor used in the present embodiment is similar sequencing batch reactor, and anaerobic environment is more preferable, advantageously in anaerobism
Sulfur autotrophic denitrification bacteria growing；
(d) solid-liquid separation: reacted mixed liquor is staticly settled, supernatant detection up to standard after discharge, nitrate nitrogen and
The removal effect of arsenic as it is shown in figure 1, after reaction 13d the aqueous concentration of nitrate nitrogen and arsenic be respectively 0.725mg/L and
0.006mg/L, its treatment effeciency is respectively 97.95% and 99.99%.
The method provided in the present embodiment is the best to the removal effect of the nitrate in subsoil water and arsenic, with contrast patent
201310070136.5 compare, and have clearance high, the advantage that the response time is short, and this is primarily due to the target of present invention screening
The growth rate of strain own is fast, and suitable growth temperature is extensive, adheres to and on natural magnetic iron ore carries out the nitrate in water and arsenic
During removal, denitrification rate is fast, without added regent, bacterium solution good separating effect, can run continuously.The present invention and contrast patent
201310695460.6 compare, and there is following difference: the object that (1) processes is different, and what contrast patent processed is sewage, this
Daylight reason is subsoil water, and both nature differences are huge；(2) type of reactor is different, and the reactor that the present invention uses is similar to
Sequencing batch reactor, unlike filter tank needs backwash, anaerobic environment is more preferable, and advantageously the sulfur autotrophic denitrification bacterium in anaerobism is raw
Long；(3) reaction mechanism is also not quite similar, although is required to utilize sulfur autotrophic denitrification bacterium denitrogenation, but goes for arsenic and phosphorus
But there is difference except mechanism, during mainly showing as magnetic iron ore arsenic-adsorbing, occur increasingly complex chemical reaction (to form class
Compound like mispickel), adsorb tight difficult drop-off, the absorption of phosphorus, mainly based on physics, is prone to release during backwash.
Inventor the most also finds the Fe (OH) of the amorphous state of sulfur autotrophic denitrification bacterium oxidation magnetic iron ore generation3Arsenic is also had
The strongest Adsorption effect, is much better than magnetic iron ore itself or the autoxidation removal effect to arsenic.
Embodiment 2
A kind of utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and the method for arsenic, its process to as if by from
The artificial distribution that water, potassium nitrate, potassium dihydrogen phosphate are formulated, the steps include:
A () material prepares: be respectively the natural magnetic iron ore of 58% and 39% crush originating from Tongling, Anhui Province ferrum sulfur content
To 5～20 mesh, after pickling again with distilled water flushing to pH between 6～8, dry for standby in the vacuum drying oven of 30 DEG C；
(b) bacterial screening: utilize screening culture medium to screen from Nanjing Yangzi petrifaction sewage factory UASB technique anaerobic sludge
Sulfur autotrophic denitrification bacterium is as target strain；Main component and the concentration of screening culture medium are respectively NaS2O3·5H2O 5g/L、
KNO3 2g/L、KH2PO4 2g/L、NaHCO3 1g/L、MgCl2·6H2O 0.5g/L、NH4Cl 0.5g/L、FeSO4·7H2O
0.01g/L。
(c) sewage disposal: the initial concentration taking nitrate nitrogen and arsenic is respectively the water distribution of 34.7mg/L, 2.2mg/L, inoculation
The target strain of 8% (v/v) is in reactor, then adds after the natural magnetic iron ore that concentration is 240g/L shakes anti-at 32 DEG C
Answer 15d；
(d) solid-liquid separation: reacted mixed liquor is staticly settled, supernatant detection up to standard after discharge, nitrate nitrogen and
The removal effect of arsenic is as in figure 2 it is shown, water outlet nitrate nitrogen concentration is 5.31mg/L, and treatment effeciency is 84.7%；Water outlet arsenic concentration
It is 99.77% for 0.005mg/L, treatment effeciency.
Embodiment 3
A kind of utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and the method for arsenic, its process to as if by from
Water, potassium nitrate, the artificial distribution that potassium dihydrogen phosphate is formulated, the steps include:
A () material prepares: be respectively the natural magnetic iron ore of 58% and 39% crush originating from Tongling, Anhui Province ferrum sulfur content
To 100～150 mesh, after pickling again with distilled water flushing to pH between 6～8, dry for standby in the vacuum drying oven of 30 DEG C；
(b) bacterial screening: utilize main screening culture medium to sieve from Nanjing Yangzi petrifaction sewage factory UASB technique anaerobic sludge
Select sulfur autotrophic denitrification bacterium as target strain；
(c) sewage disposal: the initial concentration taking nitrate nitrogen and arsenic is respectively the water distribution of 21.1mg/L, 27.3mg/L, connects
The target strain of kind of 9% (v/v) is in reactor, then adds after the natural magnetic iron ore concussion that concentration is 220g/L at 25 DEG C
Reaction 13d；
(d) solid-liquid separation: reacted mixed liquor is staticly settled, supernatant detection up to standard after discharge, nitrate nitrogen and
The removal effect of arsenic as it is shown on figure 3, after Fan Ying water outlet nitrate nitrogen concentration be 0.16mg/L, treatment effeciency is 99.24%；Water outlet
Arsenic concentration is 0.007mg/L, treatment effeciency is 99.97%.
Embodiment 4
A kind of utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and the method for arsenic, its process to as if simultaneously
The Shaanxi city subsoil water polluted by nitrate and arsenic, the steps include:
A () material prepares: be respectively the natural magnetic iron ore of 58% and 39% crush originating from Tongling, Anhui Province ferrum sulfur content
To 100-150 mesh, after pickling again with distilled water flushing to pH between 6-8, dry for standby in the vacuum drying oven of 30 DEG C；
(b) bacterial screening: utilize screening culture medium to screen from Nanjing Yangzi petrifaction sewage factory UASB technique anaerobic sludge
Sulfur autotrophic denitrification bacterium is as target strain；
(c) sewage disposal: take certain the city's subsoil water simultaneously polluted by nitrate and arsenic, the object bacteria of inoculation 10% (v/v)
Kind in reactor, then at 28 DEG C, react 13d after adding the natural magnetic iron ore concussion that concentration is 250g/L；
(d) solid-liquid separation: reacted mixed liquor is staticly settled, supernatant detection up to standard after discharge, nitrate nitrogen and
As shown in Figure 4, water outlet nitrate nitrogen concentration is 0.13mg/L to the removal effect of arsenic, and treatment effeciency is 99.56%；Water outlet arsenic concentration
For 0.008mg/L, treatment effeciency is 99.96%.
Claims (9)
1. utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and a method for arsenic, comprise the following steps:
(a) material prepare: magnetic iron ore is broken into granule, after pickling again with water rinse to pH be neutrality, standby；
(b) bacterial screening: filter out from anaerobic sludge using natural magnetic iron ore be sulfur source sulfur autotrophic denitrification bacterium as mesh
Mark strain；
C () sewage disposal: take the subsoil water containing nitrate and arsenic, vaccination target strain is placed in reactor, then adds certain
Fully react after the magnetic iron ore concussion of amount；
(d) solid-liquid separation: reacted mixed liquor is staticly settled, discharge after supernatant detection is up to standard.
The most according to claim 1 a kind of natural magnetic iron ore is utilized to synchronize to remove nitrate in groundwater and the side of arsenic
Method, it is characterised in that: the magnetic iron ore used in step (a) is natural magnetic iron ore, and broken particle diameter is between 0.1-20mm.
The most according to claim 1 and 2 a kind of natural magnetic iron ore is utilized to synchronize to remove nitrate in groundwater and arsenic
Method, it is characterised in that: the screening culture medium of the sulfur autotrophic denitrification bacterium that screening is sulfur source with natural magnetic iron ore in step (b)
Main component and concentration be respectively NaS2O3·5H2O 5g/L、KNO3 2g/L、KH2PO4 2g/L、NaHCO3 1g/L、
MgCl2·6H2O 0.5g/L、NH4Cl 0.5g/L、FeSO4·7H2O 0.01g/L。
The most according to claim 1 a kind of natural magnetic iron ore is utilized to synchronize to remove nitrate in groundwater and the side of arsenic
Method, it is characterised in that: in step (c), the inoculum concentration of target strain is the 5～10% for the treatment of sewage volume.
5. utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and arsenic according to a kind of described in claim 1 or 4
Method, it is characterised in that: in step (c), the dosage of magnetic iron ore is 100～250g/L.
The most according to claim 5 a kind of natural magnetic iron ore is utilized to synchronize to remove nitrate in groundwater and the side of arsenic
Method, it is characterised in that: the optimal reactive temperature in step (c) is 15～30 DEG C.
The most according to claim 6 a kind of natural magnetic iron ore is utilized to synchronize to remove nitrate in groundwater and the side of arsenic
Method, it is characterised in that: the response time in step (c) is 5～15d.
8. utilize natural magnetic iron ore to synchronize to remove nitrate in groundwater and arsenic according to a kind of described in claim 1 or 7
Method, it is characterised in that: the reaction pH scope in step (c) is between 6～8.
9. a kind of method utilizing natural magnetic iron ore to synchronize to remove nitrate in groundwater and arsenic described in claim 1 exists
Application in ground water cleaning field.
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| CN107555519A (en) * | 2017-09-27 | 2018-01-09 | 华南理工大学 | A kind of method of effectively processing Arsenic Contamination in Groundwater |
| CN111732205A (en) * | 2020-06-28 | 2020-10-02 | 河南工业大学 | Method for removing antimonate in water by using microorganism sulfur autotrophy and sulfur disproportionation reaction |
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