CN104599732A - Method for repairing low-concentration uranium polluted water body by using syngonium podophyllum-pseudomonas reactans symbiotic purification system - Google Patents

Method for repairing low-concentration uranium polluted water body by using syngonium podophyllum-pseudomonas reactans symbiotic purification system Download PDF

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Publication number
CN104599732A
CN104599732A CN201510025064.1A CN201510025064A CN104599732A CN 104599732 A CN104599732 A CN 104599732A CN 201510025064 A CN201510025064 A CN 201510025064A CN 104599732 A CN104599732 A CN 104599732A
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uranium
pseudomonas reactans
symbiosis
water
purification systems
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CN104599732B (en
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丁德馨
邓钦文
王永东
李广悦
胡南
孙静
何家东
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Nanhua University
University of South China
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University of South China
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/12—Processing by absorption; by adsorption; by ion-exchange

Abstract

The invention provides a method for repairing a low-concentration uranium polluted water body by using a syngonium podophyllum-pseudomonas reactans symbiotic purification system. The method comprises the following steps: colonizing bacteria pseudomonas reactans into syngonium podophyllum to construct the syngonium podophyllum-pseudomonas reactans symbiotic purification system; repairing the low-concentration uranium polluted body by the syngonium podophyllum-pseudomonas reactans symbiotic purification system. By virtue of the method provided by the invention, the uranium content of 0.5-5mg/L uranium polluted body is reduced by 94.10%-99.30%; the uranium content can be reduced to be lower than 0.05mg/L by using a dip dyeing and winding method. The method has low cost and high repairing efficiency, has the characteristics of simple treatment steps, small environment risks and the like, and has good social benefits and economic benefits.

Description

A kind of utilization closes the method that fruit taro-pseudomonas reactans symbiosis purification systems repairs low concentration uranium polluted-water
Technical field
The present invention relates to the biological prosthetic field of uranium polluted-water, the invention provides a kind of utilize close fruit taro ( syngonium podophyllum)-endophyte pseudomonas reactanssymbiosis purification systems repairs the method for low concentration uranium polluted-water.
Background technology
In order to meet the ever-increasing demand of nuclear power to uranium, the scale of uranium mining is continuing to increase.The uranium-containing waste water produced in uranium mining and processing is also in continuous increase.These uranium waste water, once entered environment, will enter human body by food chain, produce radiation induced lesion.Radioactive contamination reparation in water body environment is difficult to break through at present technically, administering general method is: utilize evaporation tank spontaneous evaporation or by percolate blowback tailing dam etc., these disposal routes need long-term final-period management and maintenance, also can continue to produce uranium-bearing bed mud to continue to affect environment, the object of radical cure cannot be reached.Perhaps, the chemistry conventional for the improvement of uranium polluted-water and physical method can solve the pollution problem of uranium in environment, but cost is too high or bring new pollution in the future.Cheap, non-secondary pollution, uranium method for governing pollution new efficiently are all being sought in countries in the world.Biological renovation method has these advantages and can reclaim uranium resource again in uranium pollution amelioration, thus obtains the favor of a lot of scholar.
Biological prosthetic refer to utilize plant, animal and microorganism to absorb in the process of self-sow, degrade, the pollutant transformed in soil and water, the concentration of pollutant is made to be reduced to acceptable level, or be harmless material by poisonous and hazardous contamination transform, also comprise and pollutant is fixed in vivo, to reduce its diffusion to surrounding enviroment, thus make the environment that polluted in outward appearance and be functionally restored.Generally be divided into phytoremediation, animal reparation and microorganism remediation three types.The technical research of phytoremediation heavy metal pollution is a lot, but relatively less for the research of uranium pollution.
At present, biological prosthetic uranium contaminated soil mainly concentrates on phytoremediation aspect, as " a kind of method utilizing function plant community to repair uranium contaminated soil " (application number 201310477864.8) discloses the method utilizing function plant community to repair uranium contaminated soil.Select and to the uranium in soil, there is the arbor paper mulberry of inrichment, shrub Chinese holly and herbaceous plant reed, brake fern, difformed galingale herb and be built into the stable phytocoenosium with in-situ immobilization uranium contaminated soil function.Each Plants in function plant community enriched uranium from uranium contaminated soil, transports it into the aerial part of plant simultaneously, thus reaches the object of repairing uranium contaminated soil.And the research of the phytoremediation of uranium polluted-water is less, and mainly concentrate on the screening aspect of uranium polluted-water uranium enriching plant, as " a kind of method utilizing floating plant to repair uranium polluted-water " (application number 200910044181.7) disclose utilize floating plant Azolla imbricata ( azolla imbricata) repair the method for uranium polluted-water.It is by field sampling and indoor culture experiment, filter out that enriched uranium ability is strong, Growth and reproduction speed fast and the pteridophyte Azolla imbricata of swimming that vitality is strong, by once plantation can make concentration be uranium in the uranium polluted-water of 1.25-10 mg/L concentration decline more than 80%, finally reach country emission standard.
Plant-microorganism syntaxial system combine d bioremediation, improving the concentration effect of uranium is current popular research direction, but utilizes the report of plant-microorganism symbiosis purification systems reparation uranium polluted-water less at present.
Summary of the invention
For above-mentioned situation, the invention provides a kind of by bacterium pseudomonas reactanssurely grow and close in fruit taro body, structure conjunction fruit taro- pseudomonas reactanssymbiosis purification systems, for repairing the method for low concentration uranium polluted-water.The method utilizes pseudomonas reactansthe growth promoting function of involutory fruit taro and the respective removal effect to uranium, and the symbiosis purification systems that both are formed carries out the biological prosthetic of low concentration uranium-bearing polluted-water to the facilitation removing uranium, both had with low cost, remediation efficiency is high, has again the multiple features such as treatment step is simple, environmental risk is little.
Its concrete measure is:
(1) prepare nutrient culture media: weigh beef extract 3 g, peptone 10 g, NaCl 0.5 g in beaker, add water 1 L, autoclaving, obtains beef peptone fluid nutrient medium.Solid medium need to add after 2% agar autoclaving, pour plate again.
(2) microorganism is cultivated, preparation pseudomonas reactanssuspension: pick with oese pseudomonas reactansnutrient solution one ring, streak inoculation on solid medium, is upside down in flat board in constant incubator, and cultivation temperature is 30 DEG C, and incubation time is 24 h.The single bacterium colony of picking, in beef peptone fluid nutrient medium, is placed in constant-temperature shaking culture device and carries out shaken cultivation, and cultivation temperature is 30 DEG C, and incubation time is 24 h.
(3) dilute pseudomonas reactanssuspension: in superclean bench, will with sterilized water pseudomonas reactansthe concentration dilution of suspension is OD 600=0.5.
(4) structure conjunction fruit taro- pseudomonas reactanssymbiosis purification systems: adopt high-molecular organic material to make chinampa fixing conjunction fruit taro, after getting dilution pseudomonas reactanssuspension 1 mL, determines to grow in conjunction fruit taro body by it with containing three kinds of modes such as bacterium gauze windings after adopting injection, dip-dye root, stem's otch respectively, foundation conjunction fruit taro- pseudomonas reactanssymbiosis purification systems.
(5) employing conjunction fruit taro- pseudomonas reactanssymbiosis purification systems repairs low concentration uranium polluted-water: between the pH to 5-6 of adjustment uranium polluted-water, plant 20-30 g surely grown according to often liter of uranium polluted-water (uranium concentration is 0.5 ~ 5 mg/L) pseudomonas reactansconjunction fruit taro (namely close fruit taro- pseudomonas reactanssymbiosis purification systems), it salvaged after water planting 24 d, period detects the uranium content change in low concentration uranium polluted-water in the different time periods.
(6) recovery conjunction fruit taro- pseudomonas reactansuranium in symbiosis purification systems: adopt high temperature incineration mode will close really taro- pseudomonas reactanssymbiosis purification systems carries out ashing process, then is reclaimed by the uranium in its body with Leaching way.
In order to obtain better clean-up effect, step 5 can take following measures:
(1) environment temperature of plant growth is controlled at 25 DEG C-35 DEG C;
(2) dosage of plant is controlled at 35 below g/L;
(3) growth time of plant is controlled at 24-30 d.
The present invention closes fruit taro and endophytic bacterium with hygrophyte pseudomonas reactansfor material, foundation conjunction fruit taro- pseudomonas reactanssymbiosis purification systems, biological prosthetic for low concentration uranium-bearing polluted-water.The method closes fruit taro by cultivation in low concentration uranium-bearing polluted-water, and will pseudomonas reactanssurely grow in Yu Qiti, foundation conjunction fruit taro- pseudomonas reactanssymbiosis purification systems, utilize close fruit taro to the absorption of uranium and absorption and pseudomonas reactanspromoting growth of plants effect, improve to reach the effect that plant removes uranium in water body.
What the present invention adopted is a kind of utilize close fruit taro- pseudomonas reactanssymbiosis purification systems repairs the technical scheme of low concentration uranium-bearing polluted-water, compared with the prior art has following advantage:
(1) biomass closing fruit taro is large, well developed root system, fast growth, strong to the removal ability of uranium, strong to the tolerance of uranium, and after growing up, branch is overgrow, and joint portion Chang Sheng has aerial root, can promote that it is to the absorption of uranium and absorption further.
(2) pseudomonas reactansthere is stronger resistance to uranium ability, surely growth and breeding after in conjunction fruit taro body is grown, it can produce 1-amino-cyclopropane-1-carboxylic acid (ACC) deaminase, heteroauxin (IAA) and siderophore in growth and breeding process, they promote the growth of closing fruit taro jointly, produce siderophore simultaneously, the syngenetic process of both utilizations promotes to close fruit taro to the enrichment of uranium, thus improves its purification efficiency.
(3) have employed artificial article floating island technology, be easy to salvage and focus on.
(4) easy and simple to handle, with low cost, remediation efficiency is high, environmentally friendly, good economy performance, be applicable to repair uranium mine, uranium mill waste water.
accompanying drawing illustrates:
Fig. 1 close fruit taro- pseudomonas reactansduring symbiosis purification systems reparation uranium-containing waste water, uranium concentration over time (initial uranium concentration: 0.5 mg/L)
Fig. 2 close fruit taro- pseudomonas reactansduring symbiosis purification systems reparation uranium-containing waste water, uranium concentration over time (1.0 mg/L)
Fig. 3 close fruit taro- pseudomonas reactansduring symbiosis purification systems reparation uranium-containing waste water, uranium concentration over time (5.0 mg/L)
embodiment:
Below in conjunction with embodiment, the present invention is further detailed explanation.
Embodiment 1:
Adopt injection, contaminate, be wound around three kinds of modes by endogenetic bacteria pseudomonas reactanssurely grow close fruit taro (heavily about 25 g) in body, set up close fruit taro- pseudomonas reactanssymbiosis purification systems, be the uranium waste water above-mentioned system of the water planting (setting up three groups of Duplicate Samples) respectively of 0.5 mg/L with 1 L uranium concentration, and set up conjunction fruit taro to repair control group (setting up three groups of Duplicate Samples), Uranium in Waste Water concentration is shown in accompanying drawing 1 over time.At the 10th d, the uranium concentration of injection, dip-dye, wrapping test group is all down to 0.382 mg/L, 0.312 mg/L, 0.306 mg/L, and control group is down to 0.317 mg/L.When the 21st d, the uranium content of dip-dye, wrapping test group is down to 0.023 mg/L, 0.04 mg/L respectively, reaches discharging standards.When the 24th d, the uranium concentration of test injection group is down to 0.046 mg/L, also reaches discharging standards.And the uranium concentration of control group fails to be down to below the concentration that discharging standards specifies all the time.Visible conjunction fruit taro- pseudomonas reactanssymbiosis purification systems significantly will be better than the removal effect be used alone when closing fruit taro to the removal effect of uranium in low concentration uranium-bearing wastewater.
Embodiment 2:
Adopt injection, contaminate, be wound around three kinds of modes by endogenetic bacteria pseudomonas reactanssurely grow and close in fruit taro (heavily about 25g) body, foundation conjunction fruit taro- pseudomonas reactanssymbiosis purification systems, be the uranium waste water above-mentioned system of the water planting (setting up three groups of Duplicate Samples) respectively of 1.0 mg/L with 1 L uranium concentration, and set up conjunction fruit taro to repair control group (setting up three groups of Duplicate Samples), Uranium in Waste Water concentration is shown in accompanying drawing 2 over time.10th d, the uranium concentration of injection, dip-dye, wrapping test group is all down to 0.375mg/L, 0.629 mg/L, 0.497 mg/L, and control group is down to 0.501 mg/L.21d, the uranium content of dip-dye, wrapping test group is down to 0.043 mg/L, 0.040 mg/L respectively, reaches discharging standards.24th d, the uranium concentration of test injection group is down to 0.042 mg/L, also reaches discharging standards.And the uranium content in control group fails to reach discharging standards all the time.Visible conjunction fruit taro- pseudomonas reactanssymbiosis purification systems significantly will be better than the removal effect be used alone when closing fruit taro to the removal effect of uranium in low concentration uranium-bearing wastewater.
Embodiment 3:
Adopt injection, contaminate, be wound around three kinds of modes by endogenetic bacteria pseudomonas reactanssurely grow and close in fruit taro (heavily about 25g) body, foundation conjunction fruit taro- pseudomonas reactanssymbiosis purification systems, be the uranium waste water above-mentioned system of the water planting (setting up three groups of Duplicate Samples) respectively of 5.0 mg/L with 1 L uranium concentration, and set up conjunction fruit taro to repair control group (setting up three groups of Duplicate Samples), Uranium in Waste Water concentration is shown in accompanying drawing 3 over time; 10th d, the uranium concentration of injection, dip-dye, wrapping test group is all down to 2.007mg/L, 0.594 mg/L, 0.581 mg/L, and control group is down to 1.075 mg/L.24th d, the uranium content of dip-dye, wrapping test group is down to 0.039 mg/L, 0.035 mg/L respectively, and reach discharging standards, all the other groups are also below standard.Visible conjunction fruit taro- pseudomonas reactanssymbiosis purification systems significantly will be better than the removal effect be used alone when closing fruit taro to the removal effect of uranium in low concentration uranium-bearing wastewater.
Below be only better embodiment of the present invention, according to above-mentioned design of the present invention, those skilled in the art also can make various amendment and conversion to this.Such as, change the plantation amount of closing fruit taro, increase the plantation time, increase bacterium pseudomonas reactansinoculum concentration, change the pH value of uranium polluted-water, change nutritional labeling of uranium polluted-water etc.But similar this change and amendment all belong to essence of the present invention.

Claims (4)

1. one kind utilize close fruit taro- pseudomonas reactansthe method of system purifying low-concentration uranium-bearing polluted-water is repaired in symbiosis, it is characterized in that: by bacterium pseudomonas reactanssurely grow and close in fruit taro body, structure conjunction fruit taro- pseudomonas reactanssymbiosis purification systems, and it is applied to the biological prosthetic of low concentration uranium-bearing polluted-water, concrete steps are:
(1) prepare nutrient culture media: weigh beef extract 3 g, peptone 10 g, NaCl 0.5 g in beaker, add water 1 L, autoclaving, obtains beef peptone fluid nutrient medium, and solid medium need to add after 2% agar autoclaving, pour plate again;
(2) microorganism is cultivated, preparation pseudomonas reactanssuspension: pick with oese pseudomonas reactansnutrient solution one ring, streak inoculation on solid medium, is upside down in flat board in constant incubator, and cultivation temperature is 30 DEG C, and incubation time is 24 h;
The single bacterium colony of picking, in beef peptone fluid nutrient medium, is placed in constant-temperature shaking culture device and carries out shaken cultivation, and cultivation temperature is 30 DEG C, and incubation time is 24 h;
(3) dilute pseudomonas reactanssuspension: in superclean bench, will with sterilized water pseudomonas reactansthe concentration dilution of suspension is OD 600=0.5;
(4) structure conjunction fruit taro- pseudomonas reactanssymbiosis purification systems: adopt high-molecular organic material to make chinampa fixing conjunction fruit taro, after getting dilution pseudomonas reactanssuspension 1 mL, determines to grow in conjunction fruit taro body by it with being wound around three kinds of modes containing bacterium gauze after adopting injection, dip-dye root, stem's otch respectively, foundation conjunction fruit taro- pseudomonas reactanssymbiosis purification systems;
(5) employing conjunction fruit taro- pseudomonas reactanssymbiosis purification systems repairs low concentration uranium polluted-water: between the pH to 5-6 of adjustment uranium polluted-water, according to often liter of uranium polluted-water plantation 20-30 g surely grow close fruit taro- pseudomonas reactanssymbiosis purification systems, salvages it after water planting 24 ~ 30 d;
(6) recovery conjunction fruit taro- pseudomonas reactansuranium in symbiosis purification systems: adopt high temperature incineration mode will close really taro- pseudomonas reactanssymbiosis purification systems carries out ashing process, then is reclaimed by the uranium in its body with Leaching way.
2. build according to claim 1 and close fruit taro-endophyte pseudomonas reactanssymbiosis purification systems also applies to the method for repairing low concentration uranium-bearing polluted-water, and it is characterized in that, the uranium concentration of described uranium polluted-water is 0.5 ~ 5 mg/L.
3. one according to claim 1 utilizes and closes fruit taro-endophyte pseudomonas reactanssymbiosis purification systems repairs the method for low concentration uranium polluted-water, it is characterized in that: described step 5, in order to reach better concentration effect, and employing conjunction fruit taro- pseudomonas reactansthe temperature environment of symbiosis purification systems growth, 25 DEG C-35 DEG C.
4. one according to claim 1 utilizes and closes fruit taro-endophyte pseudomonas reactanssymbiosis purification systems repairs the method for low concentration uranium polluted-water, it is characterized in that: described step 5, conjunction fruit taro- pseudomonas reactansthe dosage of symbiosis purification systems controls at 35 below g/L.
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