CN116161834A - Heavy metal wastewater treatment method based on zero-valent iron packed bed system - Google Patents
Heavy metal wastewater treatment method based on zero-valent iron packed bed system Download PDFInfo
- Publication number
- CN116161834A CN116161834A CN202310457402.3A CN202310457402A CN116161834A CN 116161834 A CN116161834 A CN 116161834A CN 202310457402 A CN202310457402 A CN 202310457402A CN 116161834 A CN116161834 A CN 116161834A
- Authority
- CN
- China
- Prior art keywords
- zero
- valent iron
- packed bed
- heavy metal
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 87
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 96
- 238000000034 method Methods 0.000 claims abstract description 55
- 239000000945 filler Substances 0.000 claims abstract description 47
- 238000011282 treatment Methods 0.000 claims abstract description 46
- 238000004062 sedimentation Methods 0.000 claims abstract description 27
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000001556 precipitation Methods 0.000 claims abstract description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005273 aeration Methods 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 11
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 10
- 239000011651 chromium Substances 0.000 claims abstract description 9
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 8
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 238000010979 pH adjustment Methods 0.000 claims abstract description 8
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 238000012856 packing Methods 0.000 claims description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000006004 Quartz sand Substances 0.000 claims description 11
- 235000013162 Cocos nucifera Nutrition 0.000 claims description 10
- 244000060011 Cocos nucifera Species 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 10
- 230000004913 activation Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 4
- 229910052753 mercury Inorganic materials 0.000 claims description 4
- 229910052711 selenium Inorganic materials 0.000 claims description 4
- 239000011669 selenium Substances 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000003610 charcoal Substances 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 22
- 230000023556 desulfurization Effects 0.000 abstract description 22
- 230000000694 effects Effects 0.000 abstract description 21
- 238000009713 electroplating Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 229910017052 cobalt Inorganic materials 0.000 abstract description 4
- 239000010941 cobalt Substances 0.000 abstract description 4
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract description 4
- 239000003814 drug Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 32
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052742 iron Inorganic materials 0.000 description 7
- 229910052748 manganese Inorganic materials 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 239000011259 mixed solution Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- -1 arsenic ions Chemical class 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000002848 electrochemical method Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000002779 inactivation Effects 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000010814 metallic waste Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910001430 chromium ion Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000000909 electrodialysis Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003541 multi-stage reaction Methods 0.000 description 1
- 238000001728 nano-filtration Methods 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 238000011369 optimal treatment Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a heavy metal wastewater treatment method based on a zero-valent iron packed bed system. The heavy metal wastewater treatment method provided by the invention comprises the following steps: s1: performing pH adjustment, primary sedimentation and aeration on heavy metal wastewater to obtain pretreated wastewater; s2: the pretreatment wastewater is sent into a zero-valent iron packed bed system for treatment, the zero-valent iron packed bed system comprises at least one level zero-valent iron packed bed reactor, the zero-valent iron packed bed reactor is provided with a filler layer, and micron-level zero-valent iron is filled in the filler layer; s3: and (5) performing alkali precipitation and pH adjustment on the effluent of the zero-valent iron packed bed system to form treated effluent. The method has the advantages of simple process flow, low medicament consumption and low treatment cost, has high-efficiency removal effect on various heavy metals such as copper, nickel, cobalt, manganese, arsenic, cadmium, chromium, lead and the like, can be used for treating actual wastewater such as mine wastewater, desulfurization wastewater of a power plant, electroplating wastewater and the like, and can realize standard discharge of various actual wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a heavy metal wastewater treatment method based on a zero-valent iron packed bed system.
Background
A large amount of wastewater containing heavy metals is generated in industrial production processes such as mining and metallurgy, chemical industry, electroplating, mechanical manufacturing, energy utilization and the like, and is directly discharged into a water body environment without treatment, so that the ecological balance of the water body can be damaged, the human health can be endangered, and the ecological environment is seriously polluted. Mine wastewater generated in the mining and utilizing process of mineral resources generally contains high-concentration sulfate, has strong acidity, contains various heavy metals such as copper, manganese, arsenic, antimony and the like, has complex occurrence form, and has the characteristics of long-term property, accumulation property, irreversible pollution and the like. The electroplating wastewater has complex components and contains a large amount of organic pollutants such as a complexing agent, a stabilizer and the like which are difficult to degrade, and a plurality of heavy metal ions such as chromium, zinc, copper, cadmium, lead, nickel and the like. The desulfurization waste water produced by the thermal power plant has the characteristics of high salinity, high concentration of chloride ions, sulfate ions and the like, contains various heavy metals such as lead, mercury, selenium, arsenic and the like, and has large water quality fluctuation. Because of the complex quality of the actual wastewater, the conventional treatment technology is difficult to treat the wastewater up to the standard.
The conventional heavy metal wastewater treatment technology mainly comprises an adsorption method, a chemical precipitation method, a membrane treatment method, an electrochemical method and the like. The adsorption method adopts an adsorbent with high specific surface area and rich pores to remove heavy metals in water through high affinity, but the method is difficult to remove heavy metal ions in strong acid wastewater. The chemical precipitation method adjusts the pH value of the wastewater by adding alkaline agents such as lime, sodium hydroxide and the like, and converts heavy metal ions in the water into hydroxide precipitates with lower solubility, thereby achieving the purpose of removal. The method has the advantages of convenient operation and simple steps, but has large consumption of chemical reagents and high process cost, and simultaneously generates a large amount of sludge residues to cause secondary pollution, and has a general effect of removing certain heavy metals (such as arsenic ions). The membrane treatment method comprises reverse osmosis, electrodialysis, microfiltration, nanofiltration, ultrafiltration and the like, has the advantages of high separation efficiency, convenient operation, energy conservation, environmental protection and the like, but the membrane assembly is easy to pollute, and pretreatment and multistage membrane treatment are needed for the actual wastewater with complex water quality, so that the treatment cost is increased. The electrochemical method comprises an electro-adsorption method, an oxidation-reduction method, an electro-deposition method and the like, and the method has the advantages of strong controllability, high selectivity and the like, but the problems of low current efficiency, high treatment energy consumption, expensive electrode materials and the like caused by more impurities and side reactions limit the practical application of the method.
The zero-valent iron mainly removes heavy metals in water through oxidation reduction, adsorption, precipitation/coprecipitation and the like. However, from the point of view of practical engineering application analysis, the existing treatment method still has the following disadvantages: (1) The adopted zero-valent iron is usually nanoscale zero-valent iron, has small particle size and high reactivity, is easy to agglomerate and deactivate, is difficult to continuously and stably treat wastewater for a long time, and the effective utilization rate is reduced by excessively adding nanoscale zero-valent iron, and the cost of wastewater treatment is increased by nanoscale materials; (2) The reactor or the device is a fluidized bed reactor, electric stirring is needed in the reactor to enable the wastewater and the nanometer zero-valent iron particles to fully contact and mix for reaction, so that the energy consumption is increased, and the problems of difficult separation and recovery of the later-stage iron powder and the like exist; (3) The treatment object is simulated wastewater with small treatment capacity, the components are single, and the treatment object cannot adapt to engineering application requirements of actual wastewater with complex water quality.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a heavy metal wastewater treatment method based on a zero-valent iron packed bed system, which has the advantages of simple process flow, low medicament consumption and high-efficiency removal effect on various heavy metals such as copper, nickel, cobalt, manganese, arsenic, cadmium, chromium, lead and the like.
The invention provides a heavy metal wastewater treatment method based on a zero-valent iron packed bed system, which comprises the following steps:
s1: performing pH adjustment, primary sedimentation and aeration on heavy metal wastewater to obtain pretreated wastewater;
s2: the pretreatment wastewater is sent into a zero-valent iron packed bed system for treatment, the zero-valent iron packed bed system comprises at least one level zero-valent iron packed bed reactor, the zero-valent iron packed bed reactor is provided with a filler layer, and micron-level zero-valent iron is filled in the filler layer;
s3: and (5) performing alkali precipitation and pH adjustment on the effluent of the zero-valent iron packed bed system to form treated effluent.
In the step S1 of the invention, the pH is adjusted to be 6-8 when the pH of the heavy metal wastewater is adjusted; the aeration time is 1-2 h. Studies have shown that: the pretreatment process of pH adjustment, preliminary sedimentation and aeration is sequentially carried out on the actual heavy metal wastewater by adopting the pH adjustment tank, the preliminary sedimentation tank and the aeration tank, so that the treatment effect of the subsequent zero-valent iron packed bed reactor on heavy metal can be effectively improved, and the reason is probably that: the specific pretreatment process converts complex heavy metals in the actual heavy metal wastewater with complex components into ionic heavy metals, reduces the concentration of solid suspended matters in the wastewater and the interference effect of other impurity components, avoids the adverse effect caused by the complex components in the actual wastewater, and further obtains good treatment effect by adopting micron-sized zero-valent iron.
The actual desulfurization wastewater generally contains 400-1200 mg/L ammonia nitrogen, ammonia is separated from water in the form of molecular ammonia by aeration based on the difference of the relative volatilities of the ammonia and water molecules under different pH values (formula 1), and the complex heavy metal is decomplexed to become ionic heavy metal (formula 2), so that the ammonia is more easily removed by the zero-valent iron packed bed reactor with high efficiency.
In the step S2 of the invention, the zero-valent iron packed bed reactor comprises a shell, wherein a water inlet area, a packing layer and a water outlet sedimentation area are sequentially arranged in the shell from top to bottom, and the height ratio among the water inlet area, the packing layer and the water outlet sedimentation area is (1-5): (2-3): (1-6).
Specifically, the upper part and the lower part of the shell are respectively cylindrical and inverted trapezoid, the water inlet area and the packing layer are arranged on the upper part of the shell, the water outlet sedimentation area is arranged on the lower part of the shell, and the ratio of the diameter of the upper part of the shell to the height of the packing layer is (2-5): 1, the ratio of the diameter of the bottom surface of the lower part of the shell to the height of the filler layer is (1-3): 1.
the packing layer comprises packing and micron-sized zero-valent iron loaded in the packing; wherein the filler is at least one selected from sponge, polyhedral hollow sphere, three-dimensional hollow filler, suspending ball, quartz sand and coconut shell carbon, preferably sponge, quartz sand, coconut shell carbon, polyhedral hollow sphere or three-dimensional hollow filler, and more preferably sponge, quartz sand or coconut shell carbon. Studies have shown that: the sponge, quartz sand and coconut shell carbon are used for rapidly treating and removing heavy metals in actual wastewater, and have stable and optimal treatment effect; and the treatment effect of the multi-surface hollow spheres and the three-dimensional hollow fillers is better. In addition, the particle size of the micron-sized zero-valent iron may be 30-50 μm, and the loading amount of the micron-sized zero-valent iron in the filler may be 5-10%.
In particular, the zero-valent iron packed bed reactor is activated before the pretreated wastewater is sent to the zero-valent iron packed bed system for treatment; the activation includes: naNO addition to the packing layer of a zero-valent iron packed bed reactor 3 With FeSO 4 The activation is carried out for a period of 24-72 h, preferably 24 hours. More specifically, naNO in the mixed solution 3 The concentration of (2) is 25-35 mg/L, preferably 30mg/L; feSO in the mixed solution 4 The concentration of (2) is 25-35 mg/L, preferably 30mg/L; the addition rate of the mixed solution is 10-15 mL/h, preferably 12mL/h.
In step S3 of the present invention, the alkali precipitation includes: and (3) adjusting the pH value of the effluent of the zero-valent iron packed bed system to 9-11 by adopting lime water solution.
The setting level of the zero-valent iron packed bed reactor is not strictly limited, and the zero-valent iron packed bed reactor can be reasonably set according to actual conditions; in particular, the zero-valent iron packed bed system can comprise more than two stages of zero-valent iron packed bed reactors, and the effluent of the upper stage of zero-valent iron packed bed reactor enters the lower stage of zero-valent iron packed bed reactor for further treatment by gravity.
The invention does not limit the heavy metal waste water strictly, the heavy metal waste water can contain a plurality of ions in copper, manganese, arsenic, selenium, lead, cadmium, mercury, chromium and nickel, including but not limited to the actual waste water such as mine waste water, power plant desulfurization waste water, electroplating waste water and the like, and the concentration of each heavy metal in the waste water is 0-160 mg/L; after the treatment by the method provided by the invention, the concentration of heavy metal ions in the treated effluent reaches the integrated wastewater discharge standard of the people's republic of China (GB 8978-1996).
The implementation of the invention has at least the following advantages:
1. the heavy metal wastewater treatment method disclosed by the invention has the advantages of simple process flow, low medicament consumption, low energy consumption and low treatment cost, has a good treatment effect on complex actual wastewater, can efficiently remove various heavy metals in water, and has a wide application prospect;
2. compared with nanoscale zero-valent iron, the method has the advantages that the agglomeration phenomenon is slowed down, and the rapid dissolution and inactivation of iron ions are prevented; and by NaNO 3 With FeSO 4 The mixed solution is activated, and active iron components are dynamically generated, so that the system keeps long-term stable performance of treating heavy metals;
3. according to the invention, a specific zero-valent iron packed bed system is adopted for treatment, and when a multistage zero-valent iron packed bed reactor is arranged, the multistage reaction of heavy metal wastewater can be realized by utilizing the height difference of different reactors under the action of gravity, so that the energy consumption is reduced, and the treatment effect is improved; compared with the traditional ferric salt precipitation method, the method has the advantages that the generated solid waste slag is small, and the actual waste water with complex water quality and heavy metal concentration up to 150 mg/L can be treated to reach the standard;
4. the pH adjusting tank, the primary sedimentation tank and the aeration tank are adopted as the pretreatment process of the zero-valent iron packed bed system, so that the complex heavy metal can be converted into ionic heavy metal, the concentration of solid suspended matters in the wastewater is reduced, and the treatment effect of the zero-valent iron packed bed device on the heavy metal is ensured; meanwhile, after the zero-valent iron is filled in the bed system, an alkali sedimentation tank is adopted for alkali sedimentation, redundant iron, manganese and other ions in the wastewater are further removed, and the micron-sized zero-valent iron can achieve the treatment effect equivalent to or even better than the nanometer-sized zero-valent iron, so that the treated effluent is ensured to meet the discharge standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a front view of a zero-valent iron packed bed reactor of an embodiment.
Reference numerals illustrate:
1: a water inlet area; 2: a filler layer; 3: and (5) discharging water from a precipitation area.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms also include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the zero-valent iron packed bed reactor (abbreviated as a reactor) of the present embodiment includes a shell, in which a water inlet zone 1, a packing layer 2 and a water outlet precipitation zone 3 are sequentially disposed from top to bottom, and a height ratio among the water inlet zone 1, the packing layer 2 and the water outlet precipitation zone 3 is (1-5): (2-3): (1-6). The upper part and the lower part of the shell are respectively cylindrical and inverted trapezoid, the water inlet area 1 and the packing layer 2 are arranged on the upper part of the shell, the water outlet sedimentation area 3 is arranged on the lower part of the shell, and the ratio of the diameter of the upper part of the shell to the height of the packing layer 2 is (2-5): 1, the ratio of the diameter of the bottom surface of the lower part of the shell to the height of the packing layer 2 is (1-3): 1. the packing layer 2 comprises a packing and micron-sized zero-valent iron loaded in the packing; wherein the filler is at least one selected from sponge, polyhedral hollow sphere, three-dimensional hollow filler, suspending ball, quartz sand and coconut shell charcoal; the particle size of the micron-sized zero-valent iron is 30-50 mu m, and the load of the micron-sized zero-valent iron in the filler is 5-10%.
The structural parameters of the zero-valent iron packed bed reactor are designed by taking the heavy metal wastewater treatment capacity of 9 t/d as an example, the hydraulic retention time of the reactor is 2 h, and the inflow water flow rate is 375L/h. Effective volume of the reactor
= 375 L/h×2 h = 750 L = 0.75 m 3 。
The filler layer 2 is filled with 3-10 layers of sponge, the sponge is medium-density plant fiber net polyurethane biochemical cotton, the holes are more, the structure is stable, and the density of the sponge is 19.11 kg/m 3 (surface volume, non-compressed) porosity 95%; the sponge is uniformly scattered with 8% of reduced iron powder with the density of 7.845 g/cm 3 Addition amount of reduced iron powder
=30 kg, reduced iron powder filling amount of 0.0038 m 3 The method comprises the steps of carrying out a first treatment on the surface of the The thickness of the single-layer sponge is 20 mm, the height of the sponge after water absorption and feeding is higher than that of the original sponge, the coefficient is 1.5, and the height of the packing layer 2 is>
=300 mm, reactor upper diameter +.>
Volume of filler layer 2 =1200 mm>
= 0.339 m 3 . Height of the water inlet zone 1->
Volume of water inlet zone 1 =200 mm->
= 0.226 m 3 . Volume of effluent precipitation zone 3->
= 0.185 m 3 . The effluent precipitation zone 3 is designed as an inverted trapezoid, the diameter of the lower part of the reactor is +.>
The height of the effluent sedimentation zone 3 is calculated as =900 mm>
=212 mm。
Example 2
The packing layers formed by different packings were set in the zero-valent iron packed bed reactor of example 1 in the following manner:
1) Sponge: the 200 g reduced iron powder is weighed and uniformly scattered in the pores of the three layers of sponges;
2) Polyhedral hollow sphere and three-dimensional hollow filler: uniformly filling the sponge loaded with 200 g reduced iron powder into the polyhedral hollow balls or the three-dimensional hollow filler;
3) Quartz sand, manganese sand, coconut shell carbon filler: firstly, paving a layer of quartz sand, manganese sand or coconut carbon filler, then uniformly scattering 200 g reduced iron powder on each filler, and finally paving a layer of quartz sand, manganese sand or coconut carbon filler on the quartz sand;
4) Sponge iron: 200 g sponge iron is weighed as a filler layer.
The particle sizes of the different fillers are shown in Table 1.
The filler layer is activated in the following manner:
continuously dripping NaNO into the upper part of each packing layer at the rate of 12mL/h 3 With FeSO 4 In the mixed solution of NaNO 3 、FeSO 4 The concentration of the iron powder is 30mg/L, and 24h is continuously added dropwise to activate the reduced iron powder in the filler layer.
After activation, the heavy metal removal experiment was performed by the following method:
preparing simulated heavy metal wastewater containing 2 mg/L copper, manganese, arsenic, selenium, lead, cadmium, mercury, chromium and nickel ions respectively, regulating the pH of the simulated heavy metal wastewater to 7, continuously pumping the simulated heavy metal wastewater into the upper part of a zero-valent iron packed bed reactor at the rate of 2L/h after aeration of 1 h, and simultaneously continuously dropwise adding FeSO into the zero-valent iron packed bed reactor at the rate of 12mL/h 4 With FeCl 3 In (2) a mixed solution of FeSO 4 、FeCl 3 The concentration of (C) was 30mg/L, and samples were taken from the lower part of the zero-valent iron packed bed reactor, and immediately after the sampling, the suspension was filtered through a 0.45 μm filter.
After the obtained filtrate was diluted, the concentration of each metal ion in the filtrate was detected by an atomic absorption spectrophotometer (RayLeigh, WFX-220B) and an atomic fluorescence spectrometer (AFS-8220).
The effect of the zero-valent iron packed bed reactor with different fillers on the removal of heavy metals from water after 2 h is treated by the zero-valent iron packed bed reactor is shown in table 2.
The results in table 2 show that: the zero-valent iron packed bed reactor can rapidly and effectively remove various heavy metals including cobalt, copper, manganese, nickel, cadmium, chromium and lead in simulated heavy metal wastewater, wherein sponge filler, quartz sand and coconut shell carbon are rapid in treatment and stable in removal effect on heavy metals in water, the treatment effect is optimal, and the treatment effects of the multi-surface hollow spheres and the three-dimensional hollow fillers are also better; however, the manganese sand filler has manganese dissolution phenomenon, and the treatment effect of the sponge iron is the worst.
Example 3
The treatment method of example 2 was used to treat heavy metals in actual mine wastewater, the pH of the mine wastewater was 2, the sulfate concentration was 2196 mg/L, the total hardness was 1337 mg/L, the total dissolved solids content was 2658 mg/L, the fluoride concentration was 11.5 mg/L, the total iron concentration was 61.18 mg/L, and the heavy metal concentrations were as shown in Table 3.
Firstly, feeding mine wastewater into a pH regulating tank, regulating the pH of the mine wastewater to 6, performing primary sedimentation in a primary sedimentation tank, then aerating to 0.5 and h, and then feeding the mine wastewater into an activated zero-valent iron packed bed reactor, wherein a sponge is used as a filler, a filler layer and an activation method are the same as in example 2, and the concentration of heavy metals in the reactor effluent after the reaction is 2 h is shown in Table 3; the pH of the reactor effluent is adjusted to 9, and after flocculating and settling in an alkali sedimentation tank, the detection is carried out by adopting the method of the example 2, and the concentration of heavy metals in the final effluent is shown in Table 3.
The results in table 3 show that: after being treated by the heavy metal wastewater treatment method, cu, ni, pb, cd in final effluent of mine wastewater reaches class I water quality in underground water quality standard (GB/T14848-2017), co is class III water quality, and Cr and Mn are class IV water quality.
Example 4
The treatment method of example 2 is adopted to treat desulfurization wastewater of a certain power plant, wherein the pH value of the desulfurization wastewater is 3, the ammonia nitrogen concentration is 750 mg/L, the copper concentration is 0.96 mg/L, the nickel concentration is 1.35 mg/L, the arsenic concentration is 3.40 mg/L, and the heavy metal concentrations are shown in Table 4.
Firstly, the desulfurization waste water is sent into a pH adjusting tank, the pH of the desulfurization waste water is adjusted to 7, the desulfurization waste water is subjected to primary sedimentation in a primary sedimentation tank and then is aerated to 2 h, the desulfurization waste water is sent into an activated zero-valent iron packed bed reactor, sponge is used as a filler, a filler layer and an activation method are the same as in example 2, and the concentration of heavy metals in the reactor effluent after the reaction is 2 h is shown in Table 4.
After the pH of the reactor effluent is regulated to 9.5 and flocculated and precipitated by an alkali sedimentation tank, the detection is carried out by adopting the method of the example 2, and the concentration of heavy metals in the final effluent is shown in Table 4.
The results in table 4 show that: after the treatment of the heavy metal wastewater treatment method, the concentration of heavy metal ions in the final effluent of the desulfurization wastewater reaches the integrated wastewater discharge standard of the people's republic of China (GB 8978-1996).
Example 5
The treatment method of example 2 was used to treat heavy metals in electroplating wastewater, the pH of the electroplating wastewater was 0.5, the arsenic concentration was as high as 150.13 mg/L, the copper concentration was 15.69 mg/L, the cobalt concentration was 2.47 mg/L, the nickel concentration was 17.83 mg/L, the lead concentration was 2.53 mg/L, the chromium concentration was 2.55 mg/L, the cadmium concentration was 5.90 mg/L, and the heavy metal concentration was all out of standard.
Firstly, electroplating wastewater is sent into a pH adjusting tank, the pH of the electroplating wastewater is adjusted to 8 by adopting quicklime, the electroplating wastewater is subjected to primary sedimentation in a primary sedimentation tank and then is aerated to 1.5 and h, then is sent into an activated zero-valent iron packed bed reactor, and is subjected to reaction in which a filler layer and an activation method are adopted as a filler, and the concentration of heavy metals in the reactor effluent after 2 h is shown in Table 5; the pH of the reactor effluent is regulated to 10 by using quicklime, and the effluent is subjected to flocculation precipitation by an alkali precipitation tank and then is detected by using the method of example 2, and the concentration of heavy metals in the final effluent is shown in Table 5.
Table 5 the results show that: after being treated by the heavy metal wastewater treatment method, the concentration of heavy metal ions in the final effluent of the electroplating wastewater reaches the integrated wastewater discharge standard of the people's republic of China (GB 8978-1996).
Comparative example 1
The treatment method of the present invention is an improvement over the CN113307418A method.
The method of CN113307418A and the heavy metal wastewater treatment reactor adopt nanoscale zero-valent iron for treatment, and researches find that the treatment effect of the nanoscale zero-valent iron on the simulated wastewater is better, but the treatment effect of the nanoscale zero-valent iron on the actual desulfurization wastewater with complex components is poor, because the complex components in the actual desulfurization wastewater and the factors such as loss and inactivation of the nanoscale zero-valent iron have a certain influence on the treatment effect of the heavy metal wastewater treatment reactor.
The method of CN113307418A example 2 and a heavy metal wastewater treatment reactor are adopted to treat desulfurization wastewater of a certain power plant by using nanoscale zero-valent iron, wherein the pH value of the desulfurization wastewater is 3, the ammonia nitrogen concentration is 450-900 mg/L, the COD concentration is 2500-3500 mg/L, the copper concentration is 0.54 mg/L, the nickel concentration is 1.71 mg/L, the arsenic concentration is 4.24 mg/L, and the concentration of each heavy metal after treatment is shown in Table 6.
Meanwhile, the treatment method of the embodiment 4 and the zero-valent iron packed bed reactor are adopted to treat the same desulfurization wastewater by using the same amount of micron-sized zero-valent iron as a comparison, the desulfurization wastewater is firstly sent into a pH adjusting tank, the pH of the desulfurization wastewater is adjusted to 7, aeration is carried out after primary sedimentation in a primary sedimentation tank for 2 h, then the desulfurization wastewater is sent into the activated zero-valent iron packed bed reactor, a sponge is adopted as a filler, a filler layer and an activation method are adopted as the embodiment 2, the pH of the reactor effluent is adjusted to 9.5 after the reaction is carried out for 2 h, and the desulfurization wastewater is flocculated and precipitated by an alkali sedimentation tank, so that the concentration of heavy metals in the final effluent is shown in the table 6.
The results in table 6 show that: adopting a CN113307418A method and a reactor to treat actual desulfurization wastewater, and finally exceeding the standard of Ni, cd, pb and other heavy metals in the effluent; after the treatment of the method and the zero-valent iron packed bed reactor, the concentration of heavy metal ions in the final effluent of the desulfurization wastewater reaches the integrated wastewater discharge standard of the people's republic of China (GB 8978-1996).
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The heavy metal wastewater treatment method based on the zero-valent iron packed bed system is characterized by comprising the following steps of:
s1: performing pH adjustment, primary sedimentation and aeration on heavy metal wastewater to obtain pretreated wastewater;
s2: the pretreatment wastewater is sent into a zero-valent iron packed bed system for treatment, the zero-valent iron packed bed system comprises at least one level zero-valent iron packed bed reactor, the zero-valent iron packed bed reactor is provided with a filler layer, and micron-level zero-valent iron is filled in the filler layer;
s3: and (5) performing alkali precipitation and pH adjustment on the effluent of the zero-valent iron packed bed system to form treated effluent.
2. The method for treating heavy metal wastewater according to claim 1, wherein in step S1, the pH is adjusted to adjust the pH of the heavy metal wastewater to 6 to 8; the aeration time is 1-2 h.
3. The method for treating heavy metal wastewater according to claim 1, wherein in the step S2, the zero-valent iron packed bed reactor comprises a shell, and a water inlet zone, a packing layer and a water outlet sedimentation zone are sequentially arranged in the shell from top to bottom, wherein the height ratio among the water inlet zone, the packing layer and the water outlet sedimentation zone is (1-5): (2-3): (1-6).
4. The method for treating heavy metal wastewater according to claim 3, wherein the upper part and the lower part of the housing are respectively cylindrical and inverted trapezoidal, the water inlet area and the packing layer are arranged at the upper part of the housing, the water outlet sedimentation area is arranged at the lower part of the housing, and the ratio of the diameter of the upper part of the housing to the height of the packing layer is (2-5): 1, the ratio of the diameter of the bottom surface of the lower part of the shell to the height of the filler layer is (1-3): 1.
5. the method for treating heavy metal wastewater according to claim 1, wherein the filler layer comprises a filler and micron-sized zero-valent iron supported in the filler; wherein the filler is at least one selected from sponge, polyhedral hollow sphere, three-dimensional hollow filler, suspending ball, quartz sand and coconut shell charcoal.
6. The method for treating heavy metal wastewater according to claim 5, wherein the particle size of the micron-sized zero-valent iron is 30-50 μm, and the loading amount of the micron-sized zero-valent iron in the filler is 5-10%.
7. The method for treating heavy metal wastewater according to claim 1, wherein in step S2, the zero-valent iron packed bed reactor is activated before the pretreated wastewater is sent to the zero-valent iron packed bed system for treatment; the activation includes: naNO addition to the packing layer of a zero-valent iron packed bed reactor 3 With FeSO 4 Is activated for 24-72 h.
8. The method for treating heavy metal wastewater according to claim 1, wherein in step S3, the alkali precipitation comprises: and (3) adjusting the pH value of the effluent of the zero-valent iron packed bed system to 9-11 by adopting lime water solution.
9. The method for treating heavy metal wastewater according to claim 1, wherein the zero-valent iron packed bed system comprises more than two stages of zero-valent iron packed bed reactors, and effluent of the upper stage of zero-valent iron packed bed reactor enters the lower stage of zero-valent iron packed bed reactor for further treatment by gravity.
10. The method for treating heavy metal wastewater according to claim 1, wherein the heavy metal wastewater contains a plurality of ions of copper, manganese, arsenic, selenium, lead, cadmium, mercury, chromium and nickel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310457402.3A CN116161834A (en) | 2023-04-26 | 2023-04-26 | Heavy metal wastewater treatment method based on zero-valent iron packed bed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310457402.3A CN116161834A (en) | 2023-04-26 | 2023-04-26 | Heavy metal wastewater treatment method based on zero-valent iron packed bed system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116161834A true CN116161834A (en) | 2023-05-26 |
Family
ID=86416779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310457402.3A Pending CN116161834A (en) | 2023-04-26 | 2023-04-26 | Heavy metal wastewater treatment method based on zero-valent iron packed bed system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116161834A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117417051A (en) * | 2023-12-19 | 2024-01-19 | 同济大学 | Cadmium-containing wastewater treatment method and treatment device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102951749A (en) * | 2012-11-12 | 2013-03-06 | 同济大学 | Method and device for removing heavy metals in industrial wastewater by nanoscale zero-valent iron-multilevel reversed filter type system |
| CN107215940A (en) * | 2017-06-07 | 2017-09-29 | 北京师范大学 | Multistage arrangement uniform activation Zero-valent Iron goes the water treatment system and method for removing heavy metals |
| CN108083517A (en) * | 2017-11-23 | 2018-05-29 | 浙江海洋大学 | A kind of heavy metal wastewater thereby integrated purifying technique |
| CN112912156A (en) * | 2018-10-26 | 2021-06-04 | 都灵理工大学 | Method for producing zero-valent metal in filter medium |
| CN113307418A (en) * | 2021-08-02 | 2021-08-27 | 大唐环境产业集团股份有限公司 | Heavy metal wastewater treatment method |
| US20220118516A1 (en) * | 2020-10-16 | 2022-04-21 | Chinese Research Academy Of Environmental Sciences | Silicified modified zero-valent iron and its preparation method and application |
-
2023
- 2023-04-26 CN CN202310457402.3A patent/CN116161834A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102951749A (en) * | 2012-11-12 | 2013-03-06 | 同济大学 | Method and device for removing heavy metals in industrial wastewater by nanoscale zero-valent iron-multilevel reversed filter type system |
| CN107215940A (en) * | 2017-06-07 | 2017-09-29 | 北京师范大学 | Multistage arrangement uniform activation Zero-valent Iron goes the water treatment system and method for removing heavy metals |
| CN108083517A (en) * | 2017-11-23 | 2018-05-29 | 浙江海洋大学 | A kind of heavy metal wastewater thereby integrated purifying technique |
| CN112912156A (en) * | 2018-10-26 | 2021-06-04 | 都灵理工大学 | Method for producing zero-valent metal in filter medium |
| US20220033283A1 (en) * | 2018-10-26 | 2022-02-03 | Politecnico Di Torino | Method for producing zero-valent metals in filtering media |
| US20220118516A1 (en) * | 2020-10-16 | 2022-04-21 | Chinese Research Academy Of Environmental Sciences | Silicified modified zero-valent iron and its preparation method and application |
| CN113307418A (en) * | 2021-08-02 | 2021-08-27 | 大唐环境产业集团股份有限公司 | Heavy metal wastewater treatment method |
Non-Patent Citations (1)
| Title |
|---|
| 何连生等编著: "《重金属污染调查与治理技术》", 北京：中国环境科学出版社, pages: 177 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117417051A (en) * | 2023-12-19 | 2024-01-19 | 同济大学 | Cadmium-containing wastewater treatment method and treatment device |
| CN117417051B (en) * | 2023-12-19 | 2024-05-03 | 同济大学 | Cadmium-containing wastewater treatment method and treatment device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2512997B1 (en) | Method for removing selenate from an aqueous fluid | |
| CN102718544B (en) | Ceramsite for heavy metal wastewater treatment, preparation method and applications thereof | |
| US20170362108A1 (en) | Hybrid activated iron-biological water treatment system and method | |
| WO2015109899A1 (en) | Method for quickly and effectively removing heavy metals in water body | |
| CN101559988B (en) | Treatment method of ammonia nitrogen wastewater | |
| CN106698582A (en) | Method for treating industrial wastewater containing heavy metal contaminants by utilizing industrial fly ash and nano iron | |
| US6551514B1 (en) | Cyanide detoxification process | |
| CN106430858B (en) | A kind of special equipment of High-concentration organic wastewater treatment method and this method | |
| CN105731624B (en) | A method of utilizing heterogeneous Fenton-like reaction catalytic oxidation treatment reverse osmosis concentrated water | |
| CN102161543A (en) | Advanced treatment method for well drilling wastewater based on compound catalytic oxidation of ozone | |
| CN116161834A (en) | Heavy metal wastewater treatment method based on zero-valent iron packed bed system | |
| CN104445675A (en) | Method for treating mercury-containing wastewater by virtue of demercuration adsorbent material | |
| Lichtfouse et al. | Methods for selenium removal from contaminated waters: a review | |
| CA2945980A1 (en) | Removal of selenocyanate from refinery sour water stripper wastewater | |
| CN102744030B (en) | Graphite oxide-containing nano-material, its preparation method, water treatment agent and its water treatment method | |
| Pal et al. | Emerging technologies for selenium separation and recovery from aqueous systems: A review for sustainable management strategy | |
| CN210796127U (en) | Coking wastewater defluorination decoloration advanced treatment system | |
| Krstić | Some effective methods for treatment of wastewater from Cu production | |
| CN101671068B (en) | Method for iron internal electrolysis treatment of hard-degradation organic wastewater strengthened by magnetic catalyst and used fillings thereof | |
| CN111072153A (en) | Desulfurization microbial inoculum and sewage treatment technology applying same | |
| CN113307418B (en) | Heavy metal wastewater treatment method | |
| CN211999245U (en) | Arsenic-containing organic wastewater treatment system | |
| CN104355462A (en) | Dynamic continuous mercury-containing wastewater treatment method based on mercury removal adsorbing material | |
| CN110668619A (en) | Lead-zinc industrial mineral processing wastewater treatment device and treatment method | |
| WO2011125398A1 (en) | Method for purifying polluted water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20230526 |
|
| RJ01 | Rejection of invention patent application after publication |