CN102626032A - Method adopting ryegrass and nitrilotriacetic acid (NTA) to restore heavy metal of compost leacheate - Google Patents
Method adopting ryegrass and nitrilotriacetic acid (NTA) to restore heavy metal of compost leacheate Download PDFInfo
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Abstract
The invention discloses a method adopting ryegrass and nitrilotriacetic acid (NTA) to restore heavy metal of compost leacheate, which comprises adding NTA of 10mmol/kg-1 of compost into 1, 500g of garbage compost, soaking with 3,000 ml of tap water for 72h, and making 25-100% of compost leacheate; soaking ryegrass seeds in a petri dish, measuring plant height after plants germinate, and after water culture for 30 days, cutting the plants to measure dry weight of the plants; and utilizing a TAS-990 atomic absorption spectrophotometer to measure content variation of heavy metal Cu, Ni, Zn and Cr of the plants. Experimental results show that the household garbage compost leacheate is utilized to cultivate soilless turf, organic matter, nitrogen, phosphorus and other nutritious elements are contained in the leacheate obtained by leaching the garbage compost to which a chelating agent is added, the growth requirements of the lawn plants can be fully met, and reuse and safe discharge of the garbage compost leacheate are guaranteed.
Description
Technical field
The invention belongs to garbage compost in urban lawn build and plant technology Application for Field, relate to a kind of method that adopts the collaborative NTA of perennial ryegrass to repair compost leacheate heavy metal.
Background technology
In recent years, the problem of environmental pollution that is caused by house refuse has become one of focus of social extensive concern.Along with the raising day by day of China's living standards of the people, the domestic waste generation also increases thereupon.Consumer garbage compost as lawn matrix, not only can be avoided food chain, solved the problem of outlet of rubbish simultaneously again.
Populous in China, land resources is poor relatively, has more realistic meaning with garbage compost as lawn matrix.Lawn plant in the greenery patches, gardens has the fast characteristics of growth; It is used for viewing and admiring and environment purification more; If with the growth substrate of garbage compost as lawn plant, lawn plant can reach heavy metal absorbing enriched wherein to reduce heavy metal pollution deep soil and underground water in the compost.Garbage compost has good physicochemical property, abundant nutrient, is to substitute the more satisfactory material of soil as lawn matrix.Some lawn plants can grow in the heavier matrix of heavy metal pollution, and fast growth, regeneration capacity are strong, have bigger using value in chemical method and collaborative the reparation in the garbage compost heavy metal of biological method.Therefore when garbage compost was as lawn matrix, its heavy metal can obtain the reparation of lawn plant again, had so not only increased the application potential of garbage compost but also had improved the safety of its use.At present, China has tentatively launched consumer garbage compost is used for the research work of greenery patches, gardens matrix or fertilizer, and garbage compost adds soil with the form of fertilizer usually, can improve soil property, improves turfgrass biomass, chlorophyll content etc.But the heavy metal that contains high concentration in the garbage compost when it improves soil, edaphophyte and microorganism, also produces harm to them.So, propose garbage compost to be applied to the actual idea that must remove heavy metal wherein if want.In the garbage compost application, how to prevent or reduce heavy metal to get into soil and underground water generation, become a big problem that will solve.
Chelation evoked recovery technique " (chelate-induced phytoremediation), promptly add chelating agent and the heavy metal that is combined by solid phase of soil is discharged again and enter into soil through manual work.Chelating agent commonly used at present can be divided into 3 big types: the one, and many carboxyaminos of synthetic acids chelating agent is like EDTA, DTPA, CDTA etc.; The 2nd, natural many carboxyaminos acids chelating agent is like EDDS, NTA; The 3rd, natural organic sequestering agent like some small molecular organic acids, comprises citric acid, malic acid, histidine, oxalic acid etc.; The 4th, inorganic complexing agent mainly comprises rhodanide, chloride etc.
Prior art research shows that adding EDTA can significantly improve the enriching quantity of heavy metal in supplying the examination lawn plant.But when utilizing EDTA to work in coordination with phytoremediation; Because the compound that EDTA and EDTA and heavy metal chelating form has very strong dissolubility and bio-toxicity; And in soil, be difficult to, so cause environmental problems such as polluting deep soil and groundwater contamination possibly by light, chemical substance and biological degradation.But NTA (Nitrilotriacetic acid) nitrilotriacetic acid sodium salt (amino carboxy chelating agent) was applied to scale remover in 50 years in the past always, in analytical chemistry, was used as complexometric titration agent and screening agent, Chang Zuowei activator in catalytic kinetics is analyzed.Although the NTA sequestering power than EDTA a little less than, compare with low-molecular-weight organic acid (citric acid, malic acid etc.), be still a kind of stronger chelating agent.Therefore; Cultivate no native turf with the consumer garbage compost leacheate; Contain organic matter, nitrogen, phosphorus and other nutritive element in the leaching liquor of garbage compost after drip washing of adding chelating agent, can fully satisfy the lawn plant growth needs, solved the utilization again and the safety dumping of garbage compost leacheate.
Summary of the invention
The invention discloses a kind of method that adopts the collaborative NTA of perennial ryegrass to repair compost leacheate heavy metal, it is characterized in that being undertaken by following step:
(1) experiment material: select for use the northern China English ryegrass (
Lolium perenneL.) be test material; Experiment is taken from Tianjin Xiao Dian composting plant with garbage compost, and 2 mm sieve is subsequent use excessively after air-dry;
(2) test method
1) gets 10mmolkg
-1The NTA of compost (nitrilotriacetic acid sodium salt) joins in the 1500g garbage compost, soaks 72h with the 3000ml running water, processes 25-100% compost leacheate then;
2) ryegrass seed is immersed in the compost leacheate, in diameter is the culture dish of 9.4cm, carries out, at the bottom of culture dish bottom pad one deck filter paper was medium, the duration of test intensity of illumination was 600 ~ 800
μMol m
-2s
-1Add compost leacheate 5-15ml every day according to evaporation discharge, guarantee that the compost leacheate volume that each culture dish adds equates that the mean temperature of environment is 29-30 ℃ between culture period, medial humidity is 53-55%;
3) treating that every 5d gets the best plant of three strains behind the plant germination measures a plant height, and water planting cradled the acrial part of plant after 30 days, respectively acrial part and under ground portion was dried, and recorded the plant dry weight;
4) utilize the TAS-990 atomic absorption spectrophotometer to measure the content of its heavy metal Cu, Ni, Zn, Cr.
The present invention further discloses the application of said method aspect promotion lawn plant biomass accumulation, enriching heavy metal, compost leacheate wherein is for getting 10mmolkg
-1The NTA of compost joins in the 1500g garbage compost, soaks 72h, the 50% compost leacheate of processing with the 3000ml running water.
Result of the test of the present invention shows: cultivate no native turf with the consumer garbage compost leacheate; Contain organic matter, nitrogen, phosphorus and other nutritive element in the leaching liquor of garbage compost after drip washing of adding chelating agent; Can fully satisfy the lawn plant growth needs, solve the utilization again and the safety dumping of garbage compost leacheate.
The more detailed preparation method of the present invention is following:
1 experiment material and method
1.1 experiment material
The more common English ryegrass of this experiment selected northern China (
Lolium perenneL.) be test material.Consumer garbage compost is from Tianjin Xiao Dian composting plant, and its basic physical and chemical is: pH 7.62, the content of organic matter 12.12%, full nitrogen 5.18%, available phosphorus 77.92 mgKg
-1, full potassium 50.83 gKg
-1, saturation moisture content 0.76 ml/g, unit weight 0.85 gml
-1Its heavy metal Cd, Cr, Cu, Pb, the Zn background value is respectively 1.97,67.00, and 238.73,172.11,496.38
μGg
-1
Hoagland ' s nutrient solution is formed: mother liquor 1:Ca (NO
3)
24H
2O 118 g/L; Mother liquor 2:KNO
350.5 g/L; KH
2PO
413.6 g/L; Mother liquor 3:MgSO
47H
2O 24.6 g/L; Mother liquor 4:H
3BO
33.09 g/L; MnCl
24H
2O 0.9 g/L; ZnSO
47H
2O 1.1 g/L; CuSO
45H
2O 7.5 mg/L; (NH
4)
2MoO
4124 mg/L; Mother liquor 5:EDTA-Na
23.72 g/L; FeCl
36H
2O 2.70 g/L.After mother liquor prepares, pour in the bottle that posts label separately, put into refrigerator and preserve subsequent use.Nutrient solution is got mother liquor 1,2,3 each 10mL respectively at present with join at present during preparation, mother liquor 4,5 is got each 1mL, mixes to be settled to 1000mL with distilled water then.
1.2 experimental technique
(1) preparation of garbage compost leacheate
Get 10mmolkg
-1The NTA of compost (nitrilotriacetic acid sodium salt); Join in the 1500g garbage compost; Soak 72h with the 3000ml running water; Compost leacheate seed soaking concentration is established 5 processing altogether: 0% (Hoagland ' the s nutrient solution, CK), 25%, 50%, 75% and 100% (being the original content leacheate), experiment is to repeat for 3 times.
(2) mensuration of the design of elution device and morphological index
Seed soaking is cultivated in the compost leacheate, and diameter is to carry out in the culture dish of 9.4cm, at the bottom of culture dish bottom pad one deck filter paper is medium.The duration of test intensity of illumination is 600 ~ 800
μMol m
-2s
-1Culture dish places on the experimental bench of laboratory near window, and the putting position of often changing beaker to be guaranteeing that each beaker is growth under even, consistent illumination condition, adds nutrient solution 5-15ml every day according to evaporation discharge.
Guarantee that the nutrient solution volume that each culture dish adds equates that the mean temperature of environment is 29.5 ℃ between culture period, medial humidity is 53.2%.Every 5d gets the best plant height of plant mensuration of three strains after treating plant germination, makes even all.After the water planting 30 days, cradle the acrial part of plant, with acrial part and under ground portion oven dry, record the plant dry weight respectively.
(3) background value of compost leacheate
Table 1 is the mineral nutrition and the content of beary metal of leacheate of the compost that applies NTA; Compare with the leacheate (many upright peaces, 2007) of the compost that soaks the identical time, all elements content all has increase; After this explanation applies NTA, increased the stripping of heavy metal and mineral nutrient element.
The background value analysis of table 1 compost leacheate (μ g/ml)
| Testing index | Apply the compost leacheate of NTA | The compost leacheate |
| pH | 7.14±0.11 | 7.62±0.04 |
| K | 512.29±4.77(μg/ml) | 291.30±7.24(μg/ml) |
| Na | 1893.27±23.05(μg/ml) | 1110.33±18.77(μg/ml) |
| Mg | 597.66±18.23(μg/ml) | 233.50±9.10(μg/ml) |
| Ca | 1632.08±9.86(μg/ml) | 829.90±42.73(μg/ml) |
| Fe | 0.45±0.03(μg/ml) | 0.20±0.07(μg/ml) |
| Cd | 0.05±0.00(μg/ml) | 0.03±0.01(μg/ml) |
| Cu | 2.85±0.04(μg/ml) | 0.19±0.007(μg/ml) |
| Ni | 3.77±0.29(μg/ml) | 0.36±0.09(μg/ml) |
| Pb | 0.26±0.00(μg/ml) | 0.25±0.01(μg/ml) |
About the regulation in the groundwater quality standard (GB/T14848-93), the I class mainly reflects the natural low background content of ground water chemistry component, is applicable to various uses according to national standard; The II class mainly reflects the natural background content of ground water chemistry component, is applicable to various uses; The III class is a foundation with the health a reference value, mainly is applicable to centralized Drinking Water water source and worker, agricultural water; It is foundation that the IV class requires with agricultural and water for industrial use, except that being applicable to agricultural and part of industrial water, can make Drinking Water after suitably handling; The V class should not be drunk, and other waters can be selected for use according to application target.Wherein require standard following about content of beary metal:
Table 2 groundwater quality is about the classification indicators of content of beary metal
| Heavy metal | The I class | The II class | The III class | The IV class | The V class |
| Cd (μg/ml) | ≤0.0001 | ≤0.001 | ≤0.01 | ≤0.01 | >;0.01 |
| Cu (μg/ml) | ≤0.01 | ≤0.05 | ≤1.0 | ≤1.5 | >;1.5 |
| Ni (μg/ml) | ≤0.005 | ≤0.05 | ≤0.05 | ≤0.1 | >;0.1 |
| Pb (μg/ml) | ≤0.005 | ≤0.01 | ≤0.05 | ≤0.1 | >;0.1 |
Can know by table 1 and 2; Apply that heavy metal all belongs to V class water in the leacheate of compost of NTA, heavy metal is with the leacheate stripping, with reference to the standard of table 2 country about groundwater quality in the garbage compost; With apply NTA again elution method remove the method for the heavy metal in the consumer garbage compost; Four heavy metal species content all exceed standard in its leacheate, so leacheate will certainly pollute underground water and deep soil if go without handling directly to be discharged in the environment.
(3) mensuration of content of beary metal
HNO is used in the digestion of leacheate
3And HCLO
4120-140 ℃ of down digestion, gained solution with the distilled water constant volume to 50 ml; Grass appearance takes by weighing 0.2 g and uses HNO
3And HCLO
4120-140 ℃ of digestion down, gained solution to 25 ml, utilizes the TAS-990 atomic absorption spectrophotometer to measure its content of beary metal with the distilled water constant volume at last
1.3 data
Excel 2003 and SPSS 14.0 statistical analyses are adopted in data analysis.
2 results and analysis
2.1 the garbage compost leacheate of the NTA of different proportion is to the influence of lawn plant biomass
Leacheate with the compost that applies NTA is cultivated lawn plant as nutrient solution; Can find out from 3; To perennial ryegrass; 25% and 50% of eluent concentration can improve dry weight on the ground, and the processing than Hoagland ' s nutrient solution has improved 1.23% and 16.35% respectively, wherein 50% of eluent concentration with contrast difference remarkable (
p<0.05), along with the increase of eluent concentration ratio, biomass can decrease again, when eluent concentration is 100%, has significantly suppressed the growth of perennial ryegrass overground part
The leacheate that it can also be seen that the compost that applies NTA in the table 3 is as the influence of nutrient solution to lawn plant root biomass.Along with the increase perennial ryegrass root dry weight of eluent concentration increases thereupon, all reach significance level (
p<0.05), comparison is shone and has been improved 35.78% and 33.33% respectively, but when eluent concentration was 75% and 100%, root dry weight decreased, and wherein when eluent concentration is 100%, had significantly suppressed the growth of root;
The leacheate of the compost that applies NTA of table 3 different proportion is to the influence of lawn plant biomass
2.2 the garbage compost leacheate of the NTA of different proportion is to the influence of lawn plant plant height
Table 4 is the influences to the perennial ryegrass plant height of the compost leacheate of different proportion.Compost leacheate ratio is 25% o'clock, and the perennial ryegrass plant height is the highest, and is significantly higher than contrast, and comparison has been according to having exceeded 4.0%, and along with the increase of eluent concentration ratio, plant height decreases, and when ratio reached 75% and 100%, plant height significantly was lower than contrast.
The leacheate of the compost that applies NTA of table 4 different proportion is to the influence of lawn plant plant height
2.3 the garbage compost leacheate of the NTA of different proportion is to the influence of lawn plant overground part enriching heavy metal
The garbage compost leacheate of the NTA of different proportion is cooked nutrient solution, and perennial ryegrass is to enrichment such as the table 5 of Cd.Therefrom can find out the increase along with the leacheate ratio, Cd increases in the concentration of lawn plant overground part.Difference concerning perennial ryegrass between each concentration of leacheate all significantly (
p<0.05), the concentration of Cd in perennial ryegrass is maximum during 100% leacheate, is 4.67 μ gg, is 3.22 times that Hoagland ' s nutrient solution is handled.When 25%, 50%, 75% and 100% leacheate was handled, the enriching quantity of Cd in perennial ryegrass was respectively 1.64,2.39,2.41 and 2.73 times of contrast.
The garbage compost leacheate of the NTA of 5 different proportions is to the influence of lawn plant overground part enrichment Cd
Concentration and the enriching quantity of Cu in perennial ryegrass seen table 6.From table 6, can find out the increase along with the leacheate ratio, Cu increases in the concentration of lawn plant overground part.Difference concerning perennial ryegrass between each concentration of leacheate all significantly (
p<0.05), 25%, 50%, 75% and 100% concentration at the perennial ryegrass overground part of eluent concentration is respectively 1.58,2.35,2.90 and 3.34 times of contrast, its enriching quantity is respectively 1.56,2.73,2.73 and 2.84 times of contrast.
The garbage compost leacheate of the NTA of 6 different proportions is to the influence of lawn plant overground part enrichment Cu
Table 7 is concentration and the enriching quantity of Ni at the perennial ryegrass overground part; Concerning perennial ryegrass; Along with the increase Ni of compost eluent concentration ratio increases in the concentration of perennial ryegrass overground part, not remarkable with contrast difference when eluent concentration is 25%, all there were significant differences in all the other processing (
p<0.05), its enriching quantity also is to increase along with the increase of leacheate ratio, 25%, 50%, 75% and 100% enriching quantity at the perennial ryegrass overground part of eluent concentration is respectively 1.43,3.63,4.38 and 4.71 times of contrast.
The garbage compost leacheate of the NTA of 7 different proportions is to the influence of lawn plant overground part enrichment of N i
Pb sees the following form at the concentration and the enriching quantity of the overground part of lawn plant, and along with the increase of compost eluent concentration ratio, Pb also increases in lawn plant concentration on the ground thereupon, and compares with contrast, significant difference (
p<0.05).25%, 50%, 75% and 100% enriching quantity at the perennial ryegrass overground part of eluent concentration is respectively 2.23,2.86,2.53 and 2.46 times of contrast, and in the time of can finding out leacheate 50%, Pb is maximum the enrichment of perennial ryegrass overground part.
The garbage compost leacheate of the NTA of 8 different proportions is to the influence of lawn plant overground part enrichment Pb
2.4 the garbage compost leacheate of the NTA of different proportion is to the influence of lawn plant root enriching heavy metal
The garbage compost leacheate of the NTA of different proportion is cooked nutrient solution, and the perennial ryegrass root is to enrichment such as the table 9 of Cd.Therefrom can find out the increase along with the leacheate proportional concentration, Cd increases in the concentration of lawn plant root.Difference concerning perennial ryegrass between each concentration of leacheate all significantly (
p<0.05), the concentration of Cd in perennial ryegrass is maximum during 100% leacheate, is 5.08 μ gg, is 3.30 times that Hoagland ' s nutrient solution is handled.When 25%, 50%, 75% and 100% leacheate was handled, the enriching quantity of Cd in the perennial ryegrass root was respectively 2.61,2.84,2.55 and 2.84 times of contrast, and each proportional concentration of leacheate is to the enrichment of Cd, compare with control treatment that all there were significant differences (
p<0.05), but not having significant difference between each concentration ratio, 50% leacheate is handled, and is maximum to the enriching quantity of Cd.
The garbage compost leacheate of the NTA of table 9 different proportion is to the influence of lawn plant root enrichment Cd
Concentration and the enriching quantity of Cu in perennial ryegrass seen table 10.From table 10, can find out the increase along with the leacheate ratio, Cu is all in rising trend in the concentration of lawn plant root.The group that leacheate is cooked nutrient solution concerning perennial ryegrass all significantly (
p<0.05) stronger to the accumulation ability of Cu than control group; 25%, 50%, 75% and 100% concentration at the perennial ryegrass root of eluent concentration is respectively 3.06,4.64,5.53 and 5.68 times of contrast; To the enriching quantity of Cu at the perennial ryegrass root, during 50% leacheate, the Cu enriching quantity is the highest; Be 60.16 μ g, be the contrast be respectively the contrast 6.22 times.
The garbage compost leacheate of the NTA of 10 different proportions is to the influence of the enrichment Cu of lawn plant root portion
Table 11 is concentration and the enriching quantity of Ni at the perennial ryegrass overground part; Concerning perennial ryegrass; Along with the increase Ni of compost eluent concentration ratio increases in the concentration of perennial ryegrass root, not remarkable with contrast difference when eluent concentration is 25%, all there were significant differences in all the other processing (
p<0.05), its enriching quantity also is to increase along with the increase of leacheate ratio, 25%, 50%, 75% and 100% enriching quantity at the perennial ryegrass root of eluent concentration is respectively 1.42,2.63,4.28 and 4.86 times of contrast.
The garbage compost leacheate of the NTA of 11 different proportions is to the influence of lawn plant root enrichment of N i
Pb sees table 12 at the concentration and the enriching quantity of the overground part of lawn plant; Increase along with compost eluent concentration ratio; Pb also increases in lawn plant concentration on the ground thereupon, and eluent concentration is greater than 50% leacheate, Pb the concentration of lawn plant root compare with contrast significant difference (
p<0.05).25%, 50%, 75% and 100% enriching quantity at the perennial ryegrass overground part of eluent concentration is respectively 2.43,4.00,3.20 and 3.21 times of contrast.In the time of can finding out leacheate 50%, Pb is maximum the enrichment of perennial ryegrass root, and along with the concentration ratio increase of leacheate, its enriching quantity decreases.The perennial ryegrass root is strong to the accumulation ability of Pb.
The garbage compost leacheate of the NTA of 12 different proportions is to the influence of lawn plant root enrichment Pb
3 conclusions
In this research, utilize NTA as chelating agent, the heavy metal in the compost is repaired in drip washing, and with leacheate as nutrient solution culture Lawn planted plant.No native turf is cultivated with the consumer garbage compost leacheate in (2007) such as many upright peaces; The result shows; Organic in the garbage compost leacheate, full nitrogen, available phosphorus and other nutritive element content are significantly higher than the control soil leacheate, can fully satisfy the lawn plant growth needs.Can find out from each heavy metal and the mineral nutrient element content of this experiment compost leacheate (table 1), apply the compost behind the NTA leacheate its contain the required abundant mineral nutrition of plant, but the also stripping thereupon of its heavy metal.Compare 50% leacheate with contrast, can significantly improve the biomass of perennial ryegrass overground part; 25% and 50% leacheate can significantly improve lawn plant root biomass.Along with the increase again of eluent concentration ratio, biomass decreases, and when 100% leacheate is handled lawn plant, significantly suppresses the growth of lawn plant.25% leacheate can significantly improve the plant height of perennial ryegrass, is significantly higher than contrast.It is thus clear that the leacheate of the compost that applies NTA of low concentration can promote the growth of lawn plant, excessive concentration can suppress its growth.
Lawn plant to leacheate in the accumulation ability of heavy metal, to the enrichment of Cd, along with the increase of eluent concentration; Heavy metal all increases at the overground part of lawn plant and the enriching quantity of root thereupon; When 100% leacheate, enriching quantity is maximum, but the increase of the enriching quantity of Cd; Along with the increase of eluent concentration ratio, and the increase ratio reduces.The lawn plant overground part is to the enrichment of Cu, and trend is similar with the enrichment to Cd, but root all is maximum when 50% leacheate to the enrichment of Cu, and along with the eluent concentration ratio increases, its enriching quantity decreases.Overground part of perennial ryegrass and root all are to increase along with the increase of eluent concentration to the enrichment of Ni, when 100% leacheate, reach maximum.Perennial ryegrass is to the enriching quantity of Pb, and is maximum to its enriching quantity when 100% leacheate, and the overground part of perennial ryegrass, root reach maximum to the enrichment of Pb when 50% leacheate.
The accumulation that can promote the lawn plant biomass to enrichment 50% leacheate of biomass, plant height and the heavy metal of perennial ryegrass from the compost leacheate of different concentration ratio is enriching heavy metal to the full extent again, and not obvious to the inhibitory action of plant height.
Embodiment
Below in conjunction with embodiment the present invention is described; The scheme of embodiment described here; Do not limit the present invention; One of skill in the art can make improvements and change according to spirit of the present invention, and described these improvement and variation all should be regarded as within the scope of the invention, and scope of the present invention and essence are limited claim.Used reagent has commercially available.
Embodiment 1
(1) experiment material: select for use the northern China English ryegrass (
Lolium perenneL.) be test material; Experiment is taken from Tianjin Xiao Dian composting plant with garbage compost, and 2 mm sieve is subsequent use excessively after air-dry;
(2) test method
1) gets 10mmolkg
-1The NTA of compost joins in the 1500g garbage compost, soaks 72h with the 3000ml running water, processes 25%, 50%, 75%, 100% compost leacheate then respectively;
2) ryegrass seed is immersed in the compost leacheate, in diameter is the culture dish of 9.4cm, carries out, at the bottom of culture dish bottom pad one deck filter paper was medium, the duration of test intensity of illumination was 600
μMol m
-2s
-1Add compost leacheate 15ml every day according to evaporation discharge, guarantee that the compost leacheate volume that each culture dish adds equates that the mean temperature of environment is 29 ℃ between culture period, medial humidity is 53%;
3) treating that every 5d gets the best plant of three strains behind the plant germination measures a plant height, and water planting cradled the acrial part of plant after 30 days, respectively acrial part and under ground portion was dried, and recorded the plant dry weight;
4) utilize the TAS-990 atomic absorption spectrophotometer to measure the content of its heavy metal Cu, Ni, Zn, Cr.Embodiment 2
(1) experiment material: select for use the northern China English ryegrass (
Lolium perenneL.) be test material; Experiment is taken from Tianjin Xiao Dian composting plant with garbage compost, and 2 mm sieve is subsequent use excessively after air-dry;
(2) test method
1) gets 10mmolkg
-1The NTA of compost joins in the 1500g garbage compost, soaks 72h with the 3000ml running water, processes 25%, 50%, 75%, 100% compost leacheate then respectively;
2) ryegrass seed is immersed in the compost leacheate, in diameter is the culture dish of 9.4cm, carries out, at the bottom of culture dish bottom pad one deck filter paper was medium, the duration of test intensity of illumination was 800
μMol m
-2s
-1Add compost leacheate 15ml every day according to evaporation discharge, guarantee that the compost leacheate volume that each culture dish adds equates that the mean temperature of environment is 30 ℃ between culture period, medial humidity is 55%;
3) treating that every 5d gets the best plant of three strains behind the plant germination measures a plant height, and water planting cradled the acrial part of plant after 30 days, respectively acrial part and under ground portion was dried, and recorded the plant dry weight;
4) utilize the TAS-990 atomic absorption spectrophotometer to measure the content of its heavy metal Cu, Ni, Zn, Cr.
Claims (3)
1. one kind is adopted perennial ryegrass to work in coordination with the method that NTA repairs compost leacheate heavy metal, it is characterized in that being undertaken by following step:
(1) experiment material: select for use the northern China English ryegrass (
Lolium perenneL.) be test material; Experiment is taken from Tianjin Xiao Dian composting plant with garbage compost, and 2 mm sieve is subsequent use excessively after air-dry;
(2) test method
1) gets 10mmolkg
-1The NTA of compost joins in the 1500g garbage compost, soaks 72h with the 3000ml running water, processes 25-100% compost leacheate then;
2) ryegrass seed is immersed in the compost leacheate, in diameter is the culture dish of 9.4cm, carries out, at the bottom of culture dish bottom pad one deck filter paper was medium, the duration of test intensity of illumination was 600 ~ 800
μMol m
-2s
-1Add compost leacheate 5-15ml every day according to evaporation discharge, guarantee that the compost leacheate volume that each culture dish adds equates that the mean temperature of environment is 29-30 ℃ between culture period, medial humidity is 53-55%;
3) treating that every 5d gets the best plant of three strains behind the plant germination measures a plant height, and water planting cradled the acrial part of plant after 30 days, respectively acrial part and under ground portion was dried, and recorded the plant dry weight;
4) utilize the TAS-990 atomic absorption spectrophotometer to measure the content of its heavy metal Cu, Ni, Zn, Cr.
2. the described method of claim 1, wherein NTA refers to the nitrilotriacetic acid sodium salt.
3. the application of the said method of claim 1 aspect promotion lawn plant biomass accumulation, enriching heavy metal, compost leacheate wherein is for getting 10mmolkg
-1The NTA of compost joins in the 1500g garbage compost, soaks 72h, the 50% compost leacheate of processing with the 3000ml running water.
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| CN103270867A (en) * | 2013-05-15 | 2013-09-04 | 天津师范大学 | Method for preventing heavy metal in sludge matrix from being leaked by adoption of interlayer of fly ash and biochar |
| CN103923659A (en) * | 2014-03-31 | 2014-07-16 | 天津师范大学 | Method of intensifying festuca arundinacea to repair heavy metals in soil in sewage irrigation area by NTA (Nitrilotriacetic Acid) and microbial agent |
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| CN103262734A (en) * | 2013-05-15 | 2013-08-28 | 天津师范大学 | Method for improving growth of lolium perenne by utilizing sludge rehabilitation solution |
| CN103270867A (en) * | 2013-05-15 | 2013-09-04 | 天津师范大学 | Method for preventing heavy metal in sludge matrix from being leaked by adoption of interlayer of fly ash and biochar |
| CN103262734B (en) * | 2013-05-15 | 2014-10-15 | 天津师范大学 | Method for improving growth of lolium perenne by utilizing sludge rehabilitation solution |
| CN103270867B (en) * | 2013-05-15 | 2015-04-22 | 天津师范大学 | Method for preventing heavy metal in sludge matrix from being leaked by adoption of interlayer of fly ash and biochar |
| CN103923659A (en) * | 2014-03-31 | 2014-07-16 | 天津师范大学 | Method of intensifying festuca arundinacea to repair heavy metals in soil in sewage irrigation area by NTA (Nitrilotriacetic Acid) and microbial agent |
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