CN106944470A - A kind of method of PCP ira situ degradations in acceleration rice terrace - Google Patents
A kind of method of PCP ira situ degradations in acceleration rice terrace Download PDFInfo
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- CN106944470A CN106944470A CN201710169226.8A CN201710169226A CN106944470A CN 106944470 A CN106944470 A CN 106944470A CN 201710169226 A CN201710169226 A CN 201710169226A CN 106944470 A CN106944470 A CN 106944470A
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- Prior art keywords
- pcp
- degradations
- rice terrace
- ira situ
- accelerate
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to biological technical field, it is related to a kind of restorative procedure of contaminated soil.The method of PCP (pentachlorophenol) ira situ degradation in specially a kind of acceleration rice terrace, promote the iron-reducing bacteria in water paddy soil that ferriferous oxide is reduced into Fe (II) in anaerobic environment using electron donor sodium citrate, the Fe (II) of generation can promote PCP dechlorinations to convert, until final mineralising.This method is capable of the PCP of effectively degrading rice Tanaka, and PCP is solved from source and enters poisoning and a variety of human diseases caused by food chain.With the destruction very little to environment, secondary pollution is not produced, it is with low cost, it is easy to large-scale operation, do not influence the advantage of production and income.
Description
Technical field
The invention belongs to biological technical field, it is related to a kind of method of repairing polluted soil.It is applied to rice field, water body,
The quick processing of PCP pollutions under the waterflooding anaerobic condition such as wetland, can make the PCP pollution concentrations after processing be up to state standards.
Background technology
Pentachlorophenol is once widely used as the main preventing and treating agricultural chemicals of snail fever host's oncomelania in the Yangtze river basin of China,
1.48 × 10 in 11 provinces, cities and autonomous regions8m2Rice field and pond in persistently used decades.Under usual conditions, PCP is difficult
It is oxidized, hardly possible is hydrolyzed, volatility is very low, it is difficult to pass through air migration so that rice terrace, wetland, water body are by serious agricultural chemicals
Pollution.These agricultural chemicals can be absorbed by plants such as paddy rice and be accumulated by food chain, and finally organism and human body are produced
Give birth to very strong toxicity.Due to potential carcinogenic, teratogenesis, mutagenesis, existence procreations and sustainable development structure of the PCP to the mankind
Into significant threat.PCP presence can be detected in many local water bodys of China, rice field at present, especially in Pearl River Delta
Area's PCP contents are very high, and can also be kept for a long time in human body, and pentachlorophenol average content exists in Pearl River Delta people's milk
2.15g/kg.Reason may is that PCP has the half-life period degraded under stable chemical cyclic structure, natural conditions most long reachable
20 years, in addition, PCP can produce minimal amount of bioxin in the environment, there is teratogenic effect, under topsoil, half-life period is reachable
25-100.
In view of PCP harmfulness, PCP degraded has obtained extensive concern both at home and abroad, also make significant headway.Mesh
Before, degraded PCP technology has physico-chemical process and biological method.Physico-chemical process includes absorption (Chinese patent
201310031463.X), photochemical catalytic oxidation (Chinese patent 201110020264.X), electrochemical degradation (Chinese patent
201410103417.0), these biodegrading process costs are higher and are also easy to produce secondary pollution.PCP biological degradation method in rice terrace
(ChenY.T., Environmental Science and PollutionResearch, 23 (2016), 23184-23194) is imitated
Rate is very low, and degradation cycle is long.Although rice terrace China and foreign countries, which apply lactate, can improve PCP degradation efficiencies, its efficiency is still relatively low
(ChenM.J.,Geoderma,217(2014),201-211)。
It is an object of the invention to provide the side that PCP ira situ degradations in a kind of acceleration rice terrace do not produce secondary pollution but
Method, accelerates PCP degradeds, reduces its ecological risk.
The content of the invention
Because sodium citrate is a kind of good electron donor, in the iron content soil that sodium citrate is present, iron therein
Reduction process is substantially strengthened, so as to produce more Fe (II).Fe (II) is as a kind of strong reductant, under waterflooding anaerobic condition
Organochlorine pollutant PCP can be subjected to progressively dechlorination, until final permineralization is inorganic matter.Therefore, citric acid can be utilized
Sodium strengthens Iron in Soil reduction process as electron donor, so as to lift PCP degradation efficiencies.The method can overcome conventional take off
The chlorine bacterium weakness slow to PCP degradation speeds, has the advantages that degradation rate is fast, easy to spread.
Based on above-mentioned discovery, the method for the ira situ degradation PCP of the invention provided is：Electron donor lemon is added in rice terrace
Lemon acid sodium, so as to accelerate Iron in Soil reduction process, produces substantial amounts of reducing substances Fe (II), and accelerate PCP reduction to take off
Chlorine process.
The addition of sodium citrate is depending on pollution condition in the present invention, when PCP concentration reaches 5mg/L, citric acid
The addition of sodium is 5~15mmol/L, and optimal addn is 10mmol/L.
Sodium citrate used in the present invention is common industrial chemicals, and chemical formula is Na3C6H5O7·2H2O.The present invention
There is advantages below compared with prior art：
(1) method that the present invention is provided will not cause secondary pollution compared with chemical method to soil；
(2) method that the present invention is provided has the advantages that degradation rate is fast compared with conventional biological processes；
(3) method that the present invention is provided is simple to operate, it is easy to operate, cost of material is very low；
(4) method that the present invention is provided can be realized is repaired in production, and its economic benefit is not influenceed, will be that following soil is repaiied
A kind of multiple trend.
Embodiment
Case study on implementation 1：Sodium citrate is tested the promotion that PCP in soil liquid system degrades.
The paddy soil polluted by PCP, natural air drying sieving are gathered from Guangdong Province.Add respectively in 20ml sterilizing cillin bottles
Enter 0.5g (dry weight) soil, 10ml PIPES cushioning liquid, and add final concentration of 5mg/L PCP.The additional sodium citrate of difference
Amount be 5mmol/L, 10mmol/L, 12mmol/L, 15mmol/L, in 30 DEG C of biochemical cultivation case anaerobism lucifuge cultures, periodically take
Sample is analyzed.Predominantly detect PCP concentration, Metabolites Concentration, Fe (II) concentration and extract DNA analysis microbiologic population composition, adopt
Ultrasonic vibration is taken to extract the residual PCP in solution, high performance liquid chromatography detection PCP residual concentration, GC-MS detects PCP generation
Product, ultraviolet-visible spectrophotometer detection Fe (II) concentration are thanked, and extracts DNA application pyrosequencings.PCP degradation rates are such as
Shown in table 1.As a result show, the addition of sodium citrate can be with the ira situ degradation process of PCP in significantly accelerated soil.
The experimental result of table 1 is counted
Case study on implementation 2：PCP ira situ degradations are tested in rice terrace.
Present case is tested using field repair.Sample plot is the rice terrace that Zhongshan City, Guangdong Province Dong Pu towns are polluted by PCP, its
PCP concentration is about 40ng/g (dry weight).Rice terrace is turned over first, it is smooth, keep waterflooding state, be then classified as 2m × 2m
Square rice terrace grid totally 12, stay between each grid 100cm every band.Apply the quality point of sodium citrate in each grid
Wei not 0g, 15g, 30g and 40g；Every kind of applied amount does three repetition experiments, in addition to sodium citrate applied amount is different, other all
Condition all same.Normal Rice Cropping program rice cultivation is then pressed, fertilising, weeding, holding waterflooding state simultaneously keep all places
Manage water level unanimously, and continue to determine PCP change in concentration.Its result is as shown in table 2.
The result of the test of table 2 is counted
Claims (6)
1. a kind of method of PCP ira situ degradations in acceleration rice terrace, it is characterised in that：Accelerate soil using electron donor class material
In PCP reduction dechlorinations degraded.
2. accelerate the method for PCP ira situ degradations in rice terrace as claimed in claim 1, it is characterised in that：Described electronics is supplied
Body class material is acylate.
3. accelerate the method for PCP ira situ degradations in rice terrace as claimed in claim 2, it is characterised in that：Described organic acid
Salt is citrate, gluconate, oxalates, malonate.
4. accelerate the method for PCP ira situ degradations in rice terrace as claimed in claim 2, it is characterised in that：Described organic acid
Salt most preferably citrate.
5. accelerate the method for PCP ira situ degradations in rice terrace as claimed in claim 4, it is characterised in that：Described citric acid
Salt is sodium citrate, potassium citrate, most preferably sodium citrate.
6. accelerate the method for PCP ira situ degradations in rice terrace as claimed in claim 5, it is characterised in that：When PCP concentration reaches
During to 5mg/L, the addition of sodium citrate is 5~15mmol/L, and optimal addn is 10mmol/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169226.8A CN106944470A (en) | 2017-03-21 | 2017-03-21 | A kind of method of PCP ira situ degradations in acceleration rice terrace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710169226.8A CN106944470A (en) | 2017-03-21 | 2017-03-21 | A kind of method of PCP ira situ degradations in acceleration rice terrace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106944470A true CN106944470A (en) | 2017-07-14 |
Family
ID=59472583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201710169226.8A Pending CN106944470A (en) | 2017-03-21 | 2017-03-21 | A kind of method of PCP ira situ degradations in acceleration rice terrace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470338A (en) * | 2017-09-30 | 2017-12-15 | 青岛农业大学 | The in-situ remediation method and system of plasticiser and heavy metal lead pollution agricultural land soil |
| CN110523768A (en) * | 2019-07-25 | 2019-12-03 | 湖南恒凯环保科技投资有限公司 | A kind of plant restoration method of pentachlorophenol contaminated soil |
| CN110814013A (en) * | 2019-11-22 | 2020-02-21 | 浙江大学 | Method for simultaneously producing and repairing organic contaminated paddy farmland soil |
-
2017
- 2017-03-21 CN CN201710169226.8A patent/CN106944470A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| HUAN-YUN YU ETAL: "《Effect of nitrate addition on reductive transformation of》", 《JOURNAL OF ENVIRONMENTAL MANAGEMENT》 * |
| 林加奖等: "《不同氧化还原条件下水稻土中五氯酚的消减行为》", 《面向未来的土壤科学（上册）——中国土壤学会第十二次全国会员代表大会暨第九届海峡两岸土壤肥料学术交流研讨会论文集》 * |
| 金彩霞等: "《硫酸盐还原条件下水稻土中六氯乙烷厌氧脱氯的研究》", 《浙江农业学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107470338A (en) * | 2017-09-30 | 2017-12-15 | 青岛农业大学 | The in-situ remediation method and system of plasticiser and heavy metal lead pollution agricultural land soil |
| CN110523768A (en) * | 2019-07-25 | 2019-12-03 | 湖南恒凯环保科技投资有限公司 | A kind of plant restoration method of pentachlorophenol contaminated soil |
| CN110814013A (en) * | 2019-11-22 | 2020-02-21 | 浙江大学 | Method for simultaneously producing and repairing organic contaminated paddy farmland soil |
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Application publication date: 20170714 |
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