CN104291431B - A kind of pectin stabilization nano zero valence iron repairs underground water technique - Google Patents

A kind of pectin stabilization nano zero valence iron repairs underground water technique Download PDF

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Publication number
CN104291431B
CN104291431B CN201410546891.0A CN201410546891A CN104291431B CN 104291431 B CN104291431 B CN 104291431B CN 201410546891 A CN201410546891 A CN 201410546891A CN 104291431 B CN104291431 B CN 104291431B
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nano zero
valence iron
zero valence
stabilization nano
stabilization
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CN104291431A (en
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张弛
李晓姣
曹荣莉
赵艾琪
赵保军
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BEIJING YUHUAN WORLD PROJECT MANAGEMENT CONSULTING Co Ltd
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BEIJING YUHUAN WORLD PROJECT MANAGEMENT CONSULTING Co Ltd
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    • 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
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates
    • 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

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention relates to a kind of pectin stabilization nano zero valence iron and repair underground water technology, belong to the groundwater remediation technology of field of environment pollution control.The present invention mainly solve add merely CMC as having during dispersion agent that dosage is large, poor fluidity, affect large problem by suspension acid-basicity.Pectin stabilization nano zero valence iron of the present invention repairs underground water technique, comprises the following steps: (1) prepares mixed stabilizer with pectin powder and Xylo-Mucine; (2) stabilization nano zero valence iron suspension is prepared; (3) stabilization nano zero valence iron suspension obtained for step (2) is added well through liquid-inlet pipe injection; (4) after step (3) has been injected, be loaded with the filled column of stabilization nano zero valence iron adding in well to place, this filled column being loaded with stabilization nano zero valence iron is fixed on for a long time and adds in well, the radius of influence of the filled column of each stabilization nano zero valence iron is 2.0 ~ 3.0m, and the stage of replacement is limited to 30 ~ 50 days.

Description

A kind of pectin stabilization nano zero valence iron repairs underground water technique
Technical field
The present invention relates to a kind of pectin stabilization nano zero valence iron and repair underground water technology, belong to the groundwater remediation technology of field of environment pollution control.
Background technology
The pollutent that mankind's activity produces permeates the ground, and quality of groundwater is worsened.The situation is tense for China's groundwater pollution in recent years, and the whole nation has the underground water of 90% to be all subject to pollution in various degree, and wherein 60% is seriously polluted.
More typical Remedy Technology of Contaminated Groundwater has kind more than ten at present, is mainly divided into four large classes, that is: Physical, chemical method, biological process, united restoration method.Showering and based technique for in-situ remediation can be divided into by repair mode.Wherein, based technique for in-situ remediation refers to substantially not destroying under the soil body and underground water natural environmental condition, does not carry or transport contaminated object, and carries out the method for repairing in original place.Nano zero valence iron (nZVI) in-situ reducing recovery technique belongs to the category of in-situ chemical reduction method, has the advantages such as the pollutent scope that equipment is simple, implementation cost is low, be suitable for is wide, reparation speed is fast, efficiency is high, the applicable degree of depth is large.But common nanometer iron powder character is enlivened, being easy to oxidation occurs or assembles agglomerating, wanting the reunion destroying Nano iron Particles, avoiding reuniting with regard to needing all to make particle-stabilised in each step of its preparatory phase, preservation stage, operational phase.The method improving nano-iron particle stability is in recent years generally the stabilization adopting CMC (Xylo-Mucine) to realize Nanoscale Iron, but has that CMC dosage is large, poor fluidity, affect the shortcomings such as large by suspension acid-basicity.
Summary of the invention
The present invention mainly for add merely CMC as having during dispersion agent that dosage is large, poor fluidity, affect the problems such as large by suspension acid-basicity, provide a kind of pectin stabilization nano zero valence iron to repair underground water technique.
The present invention is the technical scheme taked that solves the problem:
Pectin stabilization nano zero valence iron of the present invention repairs underground water technique, comprises the following steps:
(1) ratio being 1.5 ~ 1.0:0.5 ~ 1.0 according to mass ratio gets pectin powder and Xylo-Mucine mixes, and makes mixed stabilizer;
(2) mixed stabilizer is placed in distilled water, under starvation condition, heating makes it dissolve completely, high pure nitrogen is passed into again in the stabiliser solution after dissolving, high pure nitrogen flow velocity is 50 ~ 80mL/min, time is 20 ~ 30min, is the FeSO of 0.01 ~ 0.02mol/L by pre-configured concentration 47H 2o solution adds and passes in the stabiliser solution of high pure nitrogen, and constant temperature stirs 20 ~ 30min under nitrogen protection, is the NaBH of 0.03 ~ 0.05mol/L in whipping process by concentration 4dropwise at the uniform velocity instills in stabiliser solution, continues at the uniform velocity isothermal vibration 20 ~ 30min, and obtained stabilization nano zero valence iron suspension, the concentration of the obtained Fe contained by stabilization nano zero valence iron suspension is 0.10 ~ 0.30g/L, wherein FeSO 47H 2o solution and NaBH 4the add-on of solution calculates according to heavy metal content in underground water to be repaired to be learnt;
(3) the stabilization nano zero valence iron suspension that step (2) is obtained is got, the pH value of modification stability nano zero valence iron suspension is 6.0 ~ 7.0, temperature is 20 ~ 25 DEG C, section is added through the upstream side of route is selected at the groundwater flow that need administer, at cross section place at interval of 4 ~ 5m, bore dig diameter 50 ~ 100mm add well, the degree of depth adding well is to reach bottom the waterbearing stratum that need administer, adding preset plastics perforation floral tube in well, floral tube diameter 50 ~ 100mm, penetration hole diameter 5mm, pitch of holes 10mm, with force (forcing) pump, stabilization nano zero valence iron suspension is added well through liquid-inlet pipe injection, injection flow rate control is 0.2 ~ 0.5mL/min, injection length is 3 ~ 7h,
(4) after step (3) has been injected, be loaded with the filled column of stabilization nano zero valence iron adding in well to place, this filled column being loaded with stabilization nano zero valence iron is fixed on for a long time and adds in well, the radius of influence of the filled column of each stabilization nano zero valence iron is 2.0 ~ 3.0m, and the stage of replacement is limited to 30 ~ 50 days.
The filled column being loaded with stabilization nano zero valence iron of the present invention is made by following method: the filler in filled column is the climing ecological matrix of A Ke, before the climing ecological based filler of A Ke is placed, be first that in the stabilization nano zero valence iron suspension of 0.30 ~ 0.60g/L, isolated air soaks 5 ~ 7h by climing for A Ke ecological based filler in the concentration containing Fe.
The present invention adopts technique scheme, compared with prior art has following beneficial effect:
(1) adopt the mixed dispersant of pectin and CMC, improve the dispersity of nano zero-valence iron ion in water and continuous stability, facilitate the effect of Cr (VI) in nano zero valence iron reductive water.Specifically, the acid-base buffer system be conducive in maintenance water that adds of pectin balances, and is conducive to the deficiency making up CMC solution, can promotes that CMC is to the performance of the decentralized effect of nano zero valence iron.
(2) the nano zero-valence iron reducer adopted and pectin and CMC mixed dispersant, preparation method is easy, and equipment is simple, is beneficial to site operation.
(3) the filled column module of placing in well and being loaded with stabilization nano zero valence iron is added at reductive agent, as the auxiliary process consolidating Pollution abatement, by the lasting slow releasing of reductive agent, the permanent suppression to heavy metal contaminants in underground water can be realized, the potential risk at a specified future date caused due to unpredictable element numerous in groundwater environment can be reduced.
Embodiment
Embodiment 1
The present embodiment pectin stabilization nano zero valence iron repairs underground water technique, and getting containing Cr (VI) concentration is the underground water 100mL of 10mg/L, when using this technique, first prepares stabilization nano zero valence iron suspension.
Be that 1.0:1.0 gets pectin powder (No. CAS for 9000-69-5) and CMC (Xylo-Mucine) mixes according to mass ratio, above-mentioned mixed stabilizer is placed in distilled water, under starvation condition, heating makes it dissolve completely, high pure nitrogen is passed into again in the stabiliser solution after dissolving, high pure nitrogen flow velocity is 50mL/min, time is 20min, is the FeSO of 0.02mol/L by concentration pre-configured for 20mL 47H 2o solution adds and passes in the stabiliser solution of high pure nitrogen, and constant temperature stirs 30min under nitrogen protection, is the NaBH of 0.05mol/L in whipping process by 15mL concentration 4dropwise at the uniform velocity instills in stabiliser solution, continues at the uniform velocity isothermal vibration 30min,
Can be obtained containing the stabilization nano zero valence iron suspension that Fe amount is 0.3g/L, wherein stablizer: nZVI=10:l (mass ratio) by above step.
The suspension configured is completely cut off air to be positioned in fluid storage tank (1).The initial pH value of suspension system is adjusted to 6.0, and the initial temperature of system is 25 DEG C.Add section at the groundwater flow that need administer through the upstream side of route is selected, at this cross section place place, interval 5m, bore dig diameter 50mm add well.With force (forcing) pump (2), stabilization nano zero valence iron suspension is added well (3) through liquid-inlet pipe (4) injection, injection flow rate control is 0.5mL/min.Through the injection of 3h, stop injecting, with sealing plate (5) sealing wellhead.After stopping 12h, open sealing plate (5), add the filled column module (6) of placing in well and being loaded with stabilization nano zero valence iron aforesaid.Filler herein adopts the climing ecological matrix of A Ke, before filler placement, first filler is soaked (completely cutting off air) 7h in the nano zero valence iron stable liquid being 0.60g/L containing Fe amount.After above-mentioned treated underground water is left standstill 20 days, detect the Cr (VI) in underground water, result shows that the removal efficiency of Cr (VI) in the underground water in this place is 97.6%.
This technology also can be used for processing the heavy metal ion such as Cd (II), the Ni (II) in underground water, respond well.

Claims (2)

1. pectin stabilization nano zero valence iron repairs a underground water technique, it is characterized in that comprising the following steps:
(1) ratio being 1.5 ~ 1.0:0.5 ~ 1.0 according to mass ratio gets pectin powder and Xylo-Mucine mixes, and makes mixed stabilizer;
(2) mixed stabilizer is placed in distilled water, under starvation condition, heating makes it dissolve completely, high pure nitrogen is passed into again in the mixed stability agent solution after dissolving, high pure nitrogen flow velocity is 50 ~ 80mL/min, time is 20 ~ 30min, is the FeSO of 0.01 ~ 0.02mol/L by pre-configured concentration 47H 2o solution adds and passes in the mixed stability agent solution of high pure nitrogen, and constant temperature stirs 20 ~ 30min under nitrogen protection, is the NaBH of 0.03 ~ 0.05mol/L in whipping process by concentration 4dropwise at the uniform velocity instills in mixed stability agent solution, continues at the uniform velocity isothermal vibration 20 ~ 30min, and obtained stabilization nano zero valence iron suspension, the concentration of the obtained Fe contained by stabilization nano zero valence iron suspension is 0.10 ~ 0.30g/L, wherein FeSO 47H 2o solution and NaBH 4the add-on of solution calculates according to heavy metal content in underground water to be repaired to be learnt;
(3) the stabilization nano zero valence iron suspension that step (2) is obtained is got, the pH value of modification stability nano zero valence iron suspension is 6.0 ~ 7.0, temperature is 20 ~ 25 DEG C, section is added through the upstream side of route is selected at the groundwater flow that need administer, at cross section place at interval of 4 ~ 5m, bore dig diameter 50 ~ 100mm add well, the degree of depth adding well is to reach bottom the waterbearing stratum that need administer, adding preset plastics perforation floral tube in well, floral tube diameter 50 ~ 100mm, penetration hole diameter 5mm, pitch of holes 10mm, with force (forcing) pump, stabilization nano zero valence iron suspension is added well through liquid-inlet pipe injection, injection flow rate control is 0.2 ~ 0.5mL/min, injection length is 3 ~ 7h,
(4) after step (3) has been injected, be loaded with the filled column of stabilization nano zero valence iron adding in well to place, this filled column being loaded with stabilization nano zero valence iron is fixed on for a long time and adds in well, the radius of influence of the filled column of each stabilization nano zero valence iron is 2.0 ~ 3.0m, and the stage of replacement is limited to 30 ~ 50 days.
2. a kind of pectin stabilization nano zero valence iron according to claim 1 repairs underground water technique, it is characterized in that the described filled column being loaded with stabilization nano zero valence iron is made by following method: the filler in filled column is the climing ecological matrix of A Ke, before the climing ecological based filler of A Ke is placed, be first that in the stabilization nano zero valence iron suspension of 0.30 ~ 0.60g/L, isolated air soaks 5 ~ 7h by climing for A Ke ecological based filler in the concentration containing Fe.
CN201410546891.0A 2014-10-16 2014-10-16 A kind of pectin stabilization nano zero valence iron repairs underground water technique Expired - Fee Related CN104291431B (en)

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CN107052328B (en) * 2017-05-10 2019-03-01 同济大学 A kind of preparation method of simple stable highly active Fe sill
CN108246794A (en) * 2018-03-01 2018-07-06 环境保护部南京环境科学研究所 Improve method of the nano zero valence iron in heavy-metal composite pollution soil stabilization efficiency
CN115215422B (en) * 2022-05-19 2023-05-09 成都理工大学 Method for repairing organic pollution of underground water by in-situ reaction zone

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Publication number Priority date Publication date Assignee Title
JP2007014947A (en) * 2005-06-06 2007-01-25 National Institute Of Advanced Industrial & Technology Method for treating waste water and agent therefor
CN102380348A (en) * 2011-09-21 2012-03-21 湖南大学 Pectin modified magnetic nano-adsorbent and preparation method and application thereof
CN102897889A (en) * 2012-10-29 2013-01-30 同济大学 Method and device for purifying cadmium in waste water through nano zero-valent iron
CN102951718A (en) * 2012-11-09 2013-03-06 华南理工大学 Preparation method of modified zero-valence nano-iron suitable for underground water treatment

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US7166228B2 (en) * 2003-10-15 2007-01-23 U.S. Environmental Protection Agency Method of treating a subsurface formation with ferrous iron to reduce contaminants to harmless species
US7507345B2 (en) * 2006-08-24 2009-03-24 Lehigh University Soy proteins and/or soy derivatives with zero-valent iron compositions and use for environmental remediation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007014947A (en) * 2005-06-06 2007-01-25 National Institute Of Advanced Industrial & Technology Method for treating waste water and agent therefor
CN102380348A (en) * 2011-09-21 2012-03-21 湖南大学 Pectin modified magnetic nano-adsorbent and preparation method and application thereof
CN102897889A (en) * 2012-10-29 2013-01-30 同济大学 Method and device for purifying cadmium in waste water through nano zero-valent iron
CN102951718A (en) * 2012-11-09 2013-03-06 华南理工大学 Preparation method of modified zero-valence nano-iron suitable for underground water treatment

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