CN100554186C - Biological fixation formula permeating reaction wall system and weighting material that polluted underground water is repaired - Google Patents
Biological fixation formula permeating reaction wall system and weighting material that polluted underground water is repaired Download PDFInfo
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- CN100554186C CN100554186C CNB2007100571582A CN200710057158A CN100554186C CN 100554186 C CN100554186 C CN 100554186C CN B2007100571582 A CNB2007100571582 A CN B2007100571582A CN 200710057158 A CN200710057158 A CN 200710057158A CN 100554186 C CN100554186 C CN 100554186C
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Abstract
The present invention relates to biological fixation formula permeating reaction wall system and weighting material and method that a kind of Organic pollutants underground water is repaired.The biological fixation formula permeating reaction wall system that polluted underground water of the present invention is repaired is made up of oxygen release reaction wall and biological degradation wall; Oxygen release reaction wall 6 is preceding, biological degradation wall 7 after, be provided with oxygen release material solid particulate weighting material in the oxygen release reaction wall 6, be provided with immobilized microorganism in the biological degradation wall 7.Reaction wall system of the present invention, to change underground water oxygen deprivation and oligotrophic state, pH regulator and fixation of microbe within reaction wall system, thereby the loss of avoiding adding superior microorganism combines, and has constituted the ideal of organic pollutant in the aerobic biodegradation underground water, system efficiently.Just because of the reasonable combination of above-mentioned means, solved the problem that present permeable reactive wall technical field exists, have broad application prospects.
Description
Technical field
The present invention relates to the ecological reestablishment field of contaminate environment, biological fixation formula permeating reaction wall system and weighting material and method that particularly a kind of Organic pollutants underground water is repaired.
Background technology
Groundwater pollution is the previous serious environmental problem of order.In the underground water three major types polluted, Organic pollutants had surpassed heavy metal contamination and radiocontamination, became the principal mode of current groundwater pollution.
In utilizing the permeable reactive wall technology of aerobic biodegradation mechanism, often take following dual mode to carry out the phreatic original position repairing and treating of Organic pollutants at present: (1) injects oxygen-releasing compound (MgO by the reaction wall in underground water
2Or CaO
2), or when injecting oxygen-releasing compound, add the required nutritive substances of microorganism growth such as nitrogen phosphorus, be in indigenous microorganism organic pollutant in the decomposition and inversion underground water under aerobic condition of little work or inactivated state under field conditions (factors) with excitation.Because chemical reaction can cause the underground water water body to be strong basicity, yet its pH value exceeds 6.5～8.5 scopes of the suitable existence of indigenous microorganism to oxygen-releasing compound in discharging oxygen process, and then suppresses microbic activity, influences effective removal of pollutent; Because oxygen-releasing compound is Powdered, makes that its specific surface area is bigger, causes oxygen release speed too fast, has reduced effective utilization of oxygen-releasing compound.(2) when aforesaid method can not satisfy the biological degradation of target contaminant, then can take following means to be strengthened: in underground water, to inject oxygen-releasing compound or in the adding of the required nutritive substance of microorganism growth such as oxygen-releasing compound and nitrogen phosphorus by the reaction wall, add liquid superior microorganism solution with degradation of contaminant ability, utilize microorganism in the waterbearing stratum migration and be wrapped in the waterbearing stratum solid particles surface, form and handle band, thereby reach the purpose that is purified when polluted underground water is flowed through this processing band.Yet; except the problems referred to above still exist, owing to phreaticly flow, more weak reasons such as avidity between thalline and soil particle or the medium, make that adding microorganism runs off seriously; not only reduce phreatic biological restoration effect, also increased rehabilitation cost simultaneously.
Summary of the invention
The objective of the invention is to overcome the shortcoming in the above-mentioned existing permeable reactive wall technology, the biological fixation formula permeable reactive wall system that provides a kind of novelty, efficient, economically viable Organic pollutants underground water to repair collects promptly that nutrition and oxygen are supplied with, pH regulation and control, the microorganism fixed permeable reactive wall of multifunctional bio that is fixed as one carries out system and weighting material and the method that Organic pollutants underground water is repaired.
The biological fixation formula permeating reaction wall system that polluted underground water of the present invention is repaired is made up of oxygen release reaction wall and biological degradation wall; Oxygen release reaction wall 6 is preceding, biological degradation wall 7 after, be provided with oxygen release material solid particulate weighting material in the oxygen release reaction wall 6, be provided with immobilized microorganism in the biological degradation wall 7.
Described reaction wall system is arranged in the downstream of groundwater pollution pinnule 5, promptly still unpolluted underground water zone.Reaction wall system is through unsaturated district 2 of soil and saturation region 3, and until tangent with water-resisting layer 9, wherein oxygen release reaction wall 6 and biological degradation wall 7 are positioned at the soil saturation district.
In the biological fixation formula permeating reaction wall system that polluted underground water of the present invention is repaired, filling oxygen release material solid particulate weighting material is composed as follows in the oxygen release reaction wall:
Oxygen-releasing compound 5%～15%;
(NH
4)
2SO
4 20％～40％；
KH
2PO
4 10％～35％；
Coarse sand 8%～15%;
Cement 10%～15%;
In the biological fixation formula permeating reaction wall system that polluted underground water of the present invention is repaired, the preparation method of described immobilized microorganism weighting material is: with the microbial carrier material mass concentration is that 0.5%～4% sodium alginate is water-soluble and to add mass concentration be 0.5%～2% gac, or be that 3%～10% polyvinyl alcohol is water-soluble and add after mass concentration is 0.5%～4% sodium alginate with mass concentration, be the mixed of 1～3: 1 (the microorganism suspension liquid by volume is 1) more by volume with microorganism suspension liquid with degradation of organic substances function, then mixed solution is pressed into mass concentration and is balling-up in 0.1%～6% the calcium chloride solution, in 0～4 ℃ of following curing cross-linked 1～8 hour, get final product with 0.5%～1.5% salt water washing more at last.
The fixed permeating reaction wall system of multifunctional bio of the present invention is made up of oxygen release reaction wall 6 and biological degradation wall 7.Filling oxygen release material solid particulate in the oxygen release reaction wall 6, the oxygen release material is mainly by cement, coarse sand, oxygen-releasing compound, (NH
4)
2SO
4, KH
2PO
4, trace element and water constitutes, wherein cement plays the effect that other each component in the oxygen release material is bonded together; Coarse sand is in order to increase the perviousness of oxygen release material; Oxygen-releasing compound (MgO
2Or CaO
2) according to discharging oxygen: 2CaO behind the following formula chance water
2(or 2MgO
2)+2H
2O → O
2+ 2Ca (OH)
2(or 2Mg (OH)
2); (NH
4)
2SO
4And KH
2PO
4Not only can also can effectively reduce the water body alkaline pH value that oxygen-releasing compound causes as salt of weak acid in discharging oxygen process simultaneously for microorganism growth provides required N, P nutrition composition; Trace element then provides metabolism necessary other trace element for microorganism.In the biological degradation wall 7 filling by using embedding immobilization microorganism, be fixed on the restricted space in order to the superior microorganism that will have the degradable organic pollutant ability, avoid the loss of effective bacterium, thereby guarantee that aerobic biodegradation takes place organic pollutant in biological degradation wall 7.
The present invention is realized by following technical proposals: after organic compound is extremely underground from source of pollution 1 seepage flow, can under action of gravity, move vertically downward, after pollutent passes the unsaturated district 2 of soil and enters saturation region 3, then can under groundwater flow 4 effects transverse dispersion take place, thereby cause groundwater pollution.By investigation to the groundwater pollution scale, downstream at groundwater pollution pinnule 5, promptly still unpolluted underground water zone, general and the perpendicular somewhere of groundwater flow 4 directions, by digging---fill out means, according to oxygen release reaction wall 6 preceding, biological degradation wall 7 after order build the fixed permeating reaction wall system of multifunctional bio be installed.This system is through unsaturated district 2 of soil and saturation region 3, until tangent with water-resisting layer 9, wherein oxygen release reaction wall 6 and biological degradation wall 7 all are positioned at the soil saturation district, and oxygen release material solid particulate and immobilized microorganism are loaded in reaction within the walls respectively, and the unsaturated district of soil part then is a backfill soil 8.When polluted underground water is entering oxygen release reaction wall 6 under the natural hydraulic gradient after, the oxygen-releasing compound (MgO in the oxygen release material
2Or CaO
2) discharging oxygen, other component of inorganic salts is soluble in water simultaneously.Because the present invention selects salt of weak acid (NH
4)
2SO
4And KH
2PO
4As N, the P nutrition source of microorganism growth, its hydrolysis and ionized hydrogen ion can in and the alkaline matter Ca (OH) that produces of oxygen-releasing compound
2Or Mg (OH)
2, play the effect of regulation and control water pH value; Simultaneously,, reduced specific surface area, slowed down the oxygen rate of release of oxygen compound because Powdered oxygen release material blends is made solid particulate.After underground water passes oxygen release reaction wall 6, can enrich oxygen and the required nutritive elements such as nitrogen phosphorus of microorganism growth enter in the biological degradation wall 7 with containing, final making under biological degradation is purified by the underground water of Organic pollutants.
Unique distinction of the present invention following some:
1) the fixed permeating reaction wall system of multifunctional bio is by oxygen release reaction wall 6 and 7 two-layer compositions of biological degradation wall, this system's collection microbial nutrition and oxygen is supplied with, pH regulation and control, microorganism are fixed as one.After the underground water that is in oxygen deprivation and oligotrophic state passes the first layer reaction wall, can become the underground water that is rich in oxygen and microorganism growth desired nutritional element and enter second layer reaction wall, thereby guarantee that the microorganism in the second layer reaction wall is in aerobic condition and keeps the microorganism normal metabolic.
2) the oxygen release material solid particulate of oxygen release reaction wall 6 fillings is except that providing competent oxygen and growth desired nutritional element, owing to used slightly acidic component (NH for the microorganism in the follow-up biological degradation wall 7
4)
2SO
4And KH
2PO
4As N, the P nutrition source of microorganism growth, therefore also the high pH value of water body that oxygen-releasing compound causes can reduced to a certain degree; In addition, Powdered oxygen release material blends is made solid particulate, can reduce its specific surface area, slowed down the oxygen rate of release of oxygen compound.Biological degradation wall 7 filling immobilizations microorganism be fixed within the reaction wall owing to will have the superior microorganism of degradable organic pollutant ability, thereby avoided the loss of microorganism, increased the biomass in the repair system.
The fixed permeating reaction wall system of multifunctional bio of the present invention, to change underground water oxygen deprivation and oligotrophic state, pH regulator and fixation of microbe within reaction wall system, thereby the loss of avoiding adding superior microorganism combines, and has constituted the ideal of organic pollutant in the aerobic biodegradation underground water, system efficiently.Just because of the reasonable combination of above-mentioned means, solved the problem of the permeable reactive wall technical field existence that utilizes aerobic biodegradation mechanism at present, have broad application prospects.
Description of drawings
Fig. 1: biological fixation formula permeating reaction wall system synoptic diagram
Wherein: the 1-source of pollution, the unsaturated district of 2-soil, 3-soil saturation district, the 4-groundwater flow, 5-pollutes pinnule, 6-oxygen release reaction wall, 7-biological degradation wall, 8-backfill soil, 9-water-resisting layer
Embodiment
Be described further below in conjunction with 1 pair of system and method for the present invention of accompanying drawing.The fixed permeating reaction wall system of multifunctional bio of the present invention mainly comprises oxygen release reaction wall 6 and biological degradation wall 7, wherein filling oxygen release material solid particulate in the oxygen release reaction wall 6; In the biological degradation wall 7 filling by using embedding immobilization microorganism.
Embodiment 1:
1) making processes of oxygen release material solid particulate is: with CaO
2, (NH
4)
2SO
4, KH
2PO
4, the trace element (by MgSO
47H
2O, Fe
2(SO
4)
3, MnSO
4H
2O, ZnSO
4H
2O and NaCl form), coarse sand, cement mixing be even, sends into the tablets press granulation after adding entry, promptly gets oxygen release material solid particulate (particle diameter is 1.5cm).The mass percent of said mixture is as follows: CaO
2Be 5%; (NH
4)
2SO
4Be 40%; KH
2PO
4Be 10%; Coarse sand is 15%; Cement is 10%; Water is 15%; Trace element is 5% (MgSO wherein
47H
2O is 1%, Fe
2(SO
4)
3Be 1%, MnSO
4H
2O is 1%, ZnSO
4H
2O is 1%, NaCl is 1%).
2) immobilization method of microorganism: sodium alginate is soluble in water, add gac, and with the suspension liquid of the human pallid bacillus Ochrobactrum anthropi with aniline degradation function be by volume 1: 1 mixed evenly after, with syringe mixed solution is pressed into balling-up in the calcium chloride solution (particle diameter is 0.3cm), in 4 ℃ of following curing cross-linkeds 8 hours, get final product with 0.5% salt water washing more at last.In the said fixing process, the mass concentration of sodium alginate is 4%; The mass concentration of calcium chloride is 6%; The mass concentration of gac is 2%.
3) by investigation to the groundwater pollution scale, in the downstream of polluting pinnule 5, promptly still unpolluted underground water zone, general and the perpendicular somewhere of groundwater flow 4 directions, build two artificial irrigation canals and ditches by digging technology, wherein the oxygen release material solid particulate that the filling aforesaid method is made in article one irrigation canals and ditches is oxygen release reaction wall 6, and buries with backfill soil 8 pressures; In the second irrigation canals and ditches filling aforesaid method immobilization microorganism, be biological degradation wall 7, bury with backfill soil 8 pressures equally.When polluted underground water is passing oxygen release reaction wall 6 under the natural hydraulic gradient after, can enrich oxygen and the required nutritive elements such as nitrogen phosphorus of microorganism growth enter in the biological degradation wall 7 with containing, finally make that under biological degradation the underground water that polluted by aniline is purified.
Embodiment 2:
1) making processes of oxygen release material solid particulate is: with CaO
2, (NH
4)
2SO
4, KH
2PO
4, the trace element (by MgSO
47H
2O, Fe
2(SO
4)
3, MnSO
4H
2O, ZnSO
4H
2O and NaCl form), coarse sand, cement mixing be even, sends into the tablets press granulation after adding entry, promptly gets oxygen release material solid particulate (particle diameter is 2cm).The mass percent of said mixture is as follows: CaO
2Be 12%; (NH
4)
2SO
4Be 25%; KH
2PO
4Be 25%; Coarse sand is 8%; Cement is 13%; Water is 13%; Trace element is 4% (MgSO wherein
47H
2O is 0.8%, Fe
2(SO
4)
3Be 0.8%, MnSO
4H
2O is 0.8%, ZnSO
4H
2O is 0.8%, NaCl is 0.8%).
2) immobilization method of microorganism: sodium alginate is soluble in water, add gac, and with the white-rot fungi Phanerochaete chrysosprium burdsall with organics functions such as degradating chloro aromatic compound, phenols suspension liquid be by volume 2: 1 mixed evenly after, with syringe mixed solution is pressed into balling-up in the calcium chloride solution (particle diameter is 0.5cm), in 2 ℃ of following curing cross-linkeds 5 hours, get final product with 0.9% salt water washing more at last.In the said fixing process, the mass concentration of sodium alginate is 2%; The mass concentration of calcium chloride is 2%; The mass concentration of gac is 0.5%.
3) by investigation to the groundwater pollution scale, in the downstream of polluting pinnule 5, promptly still unpolluted underground water zone, general and the perpendicular somewhere of groundwater flow 4 directions, build two artificial irrigation canals and ditches by digging technology, wherein the oxygen release material solid particulate that the filling aforesaid method is made in article one irrigation canals and ditches is oxygen release reaction wall 6, and buries with backfill soil 8 pressures; In the second irrigation canals and ditches filling aforesaid method immobilization microorganism, be biological degradation wall 7, bury with backfill soil 8 pressures equally.When polluted underground water is passing oxygen release reaction wall 6 under the natural hydraulic gradient after, can enrich oxygen and the required nutritive elements such as nitrogen phosphorus of microorganism growth enter in the biological degradation wall 7 with containing, final making under biological degradation is purified by the underground water of Organic pollutants such as chlorinated aromatic compound, phenols.
Embodiment 3:
1) making processes of oxygen release material solid particulate is: with MgO
2, (NH
4)
2SO
4, KH
2PO
4, the trace element (by MgSO
47H
2O, Fe
2(SO
4)
3, MnSO
4H
2O, ZnSO
4H
2O and NaCl form), coarse sand, cement mixing be even, sends into the tablets press granulation after adding entry, promptly gets oxygen release material solid particulate (particle diameter is 1.5cm).The mass percent of said mixture is as follows: MgO
2Be 10%; (NH
4)
2SO
4Be 30%; KH
2PO
4Be 24%; Coarse sand is 10%; Cement is 15%; Water is 8%; Trace element is 3% (MgSO wherein
47H
2O is 0.6%, Fe
2(SO
4)
3Be 0.6%, MnSO
4H
2O is 0.6%, ZnSO
4H
2O is 0.6%, NaCl is 0.6%).
2) immobilization method of microorganism: polyvinyl alcohol is soluble in water, add sodium alginate, and with the suspension liquid of the human pallid bacillus Ochrobactrum anthropi with aniline degradation function be by volume 3: 1 mixed evenly after, with syringe mixed solution is pressed into balling-up in the calcium chloride solution (particle diameter is 0.3cm), in 2 ℃ of following curing cross-linkeds 5 hours, get final product with 1.0% salt water washing more at last.In the said fixing process, the mass concentration of polyvinyl alcohol is 4%; The mass concentration of calcium chloride is 0.1%; The mass concentration of sodium alginate is 2%.
3) by investigation to the groundwater pollution scale, in the downstream of polluting pinnule 5, promptly still unpolluted underground water zone, general and the perpendicular somewhere of groundwater flow 4 directions, build two artificial irrigation canals and ditches by digging technology, wherein the oxygen release material solid particulate that the filling aforesaid method is made in article one irrigation canals and ditches is oxygen release reaction wall 6, and buries with backfill soil 8 pressures; In the second irrigation canals and ditches filling aforesaid method immobilization microorganism, be biological degradation wall 7, bury with backfill soil 8 pressures equally.When polluted underground water is passing oxygen release reaction wall 6 under the natural hydraulic gradient after, can enrich oxygen and the required nutritive elements such as nitrogen phosphorus of microorganism growth enter in the biological degradation wall 7 with containing, finally make that under biological degradation the underground water that polluted by aniline is purified.
Embodiment 4:
1) making processes of oxygen release material solid particulate is: with MgO
2, (NH
4)
2SO
4, KH
2PO
4, the trace element (by MgSO
47H
2O, Fe
2(SO
4)
3, MnSO
4H
2O, ZnSO
4H
2O and NaCl form), coarse sand, cement mixing be even, sends into the tablets press granulation after adding entry, promptly gets oxygen release material solid particulate (particle diameter is 2cm).The mass percent of said mixture is as follows: MgO
2Be 15%; (NH
4)
2SO
4Be 20%; KH
2PO
4Be 35%; Coarse sand is 8%; Cement is 10%; Water is 10%; Trace element is 2% (MgSO wherein
47H
2O is 0.4%, Fe
2(SO
4)
3Be 0.4%, MnSO
4H
2O is 0.4%, ZnSO
4H
2O is 0.4%, NaCl is 0.4%).
2) immobilization method of microorganism: polyvinyl alcohol is soluble in water, add sodium alginate, and with the suspension liquid of the white-rot fungi Phanerochaete chrysosprium burdsall with organics functions such as degradating chloro aromatic compound, phenols be by volume 1: 1 mixed evenly after, with syringe mixed solution is pressed into balling-up in the calcium chloride solution (particle diameter is 0.5cm), in 0 ℃ of following curing cross-linked 1 hour, get final product with 1.5% salt water washing more at last.In the said fixing process, the mass concentration of polyvinyl alcohol is 10%; The mass concentration of calcium chloride is 0.3%; The mass concentration of sodium alginate is 0.5%.
3) by investigation to the groundwater pollution scale, in the downstream of polluting pinnule 5, promptly still unpolluted underground water zone, general and the perpendicular somewhere of groundwater flow 4 directions, build two artificial irrigation canals and ditches by digging technology, wherein the oxygen release material solid particulate that the filling aforesaid method is made in article one irrigation canals and ditches is oxygen release reaction wall 6, and buries with backfill soil 8 pressures; In the second irrigation canals and ditches filling aforesaid method immobilization microorganism, be biological degradation wall 7, bury with backfill soil 8 pressures equally.When polluted underground water is passing oxygen release reaction wall 6 under the natural hydraulic gradient after, can enrich oxygen and the required nutritive elements such as nitrogen phosphorus of microorganism growth enter in the biological degradation wall 7 with containing, final making under biological degradation is purified by the underground water of Organic pollutants such as chlorinated aromatic compound, phenols.
Biological fixation formula permeating reaction wall system and weighting material and method that the polluted underground water that the present invention proposes is repaired, be described by preferred embodiment, person skilled obviously can be changed or suitably change and combination system as herein described, weighting material and making method in not breaking away from content of the present invention, spirit and scope, realizes the technology of the present invention.Special needs to be pointed out is, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (2)
1. the biological fixation formula permeable reactive wall that Organic pollutants underground water is repaired is made up of oxygen release reaction wall and biological degradation wall; Oxygen release reaction wall (6) is preceding, biological degradation wall (7) after, be provided with oxygen release material solid particulate weighting material in the oxygen release reaction wall (6), the biological degradation wall is provided with immobilized microorganism in (7); It is characterized in that loading in the described oxygen release reaction wall the composed as follows of oxygen release material solid particulate weighting material:
Oxygen-releasing compound 5%～15%;
(NH
4)
2SO
4 20％～40％
KH
2PO
4 10％～35％；
Coarse sand 8%～15%;
Cement 10%～15%;
Water 8%～15%;
Trace element 2%～5%, wherein trace element is by MgSO
47H
2O, Fe
2(SO
4)
3, MnSO
4H
2O, ZnSO
4H
2Each component equivalent of O and NaCl is formed.
2. the biological fixation formula permeable reactive wall that polluted underground water as claimed in claim 1 is repaired, the preparation method who it is characterized in that described immobilized microorganism weighting material is: with the microbial carrier material mass concentration is that 0.5%～4% sodium alginate is water-soluble and to add mass concentration be 0.5%～2% gac, or be that 3%～10% polyvinyl alcohol is water-soluble and add after mass concentration is 0.5%～4% sodium alginate with mass concentration, be 1～3: 1 mixed more by volume with microorganism suspension liquid with degradation of organic substances function, then mixed solution is pressed into mass concentration and is balling-up in 0.1%～6% the calcium chloride solution, in 0～4 ℃ of following curing cross-linked 1～8 hour, get final product with 0.5%～1.5% salt water washing more at last.
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|---|---|---|---|
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|---|---|---|---|
| CNB2007100571582A CN100554186C (en) | 2007-04-17 | 2007-04-17 | Biological fixation formula permeating reaction wall system and weighting material that polluted underground water is repaired |
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