A kind of reparation cadmium-mercury combined pollution soil conditioner and application methodTechnical field
The present embodiments relate to contaminated soil remediation technical fields, and in particular to a kind of reparation cadmium-mercury combined pollutionSoil conditioner and application method.
Background technique
Cadmium is the nonessential element of plant growth, and poisoning symptom, people can be shown when plant absorption cadmium reaches certain contentVolume can seriously endanger health when tiring out cadmium to a certain extent.Cadmium in Soil is mainly derived from Industrial " three Waste " and is contained in addition to natural causeLong-term a large amount of applications of cadmium fertilizer.And with the continuous quickening of China's process of industrialization, mining, smelting etc. continue to develop, largelyCadmium wastewater waste is directly entered farmland without safe handling, leads to Cadmium Pollution in Soils.Mercury pollution is mainly with Industrial " three Waste "Form exist, but because mercury compound can make that pesticide is practical, largely added into farmland in one period once, cause soilMercury is exceeded, agricultural product mercury pollution.
Currently, Cadmium in Soil-mercury pollution reparation main path is to change its existing forms in the soil, reduce itsTransfer ability and biological effectiveness in environment；Or soil improvement by importing soil from other places, phytoremediation are utilized, heavy metal is thoroughly gone from soilIt removes.And soil moved in improve the original, soil replacement method are although effective, but project amount is big, investment is high and need to spend a large amount of manpower financial capacities, are only applicable to officeThe improvement of the serious contaminated soil in portion.Phytoremediation requires height to plant, and repairing efficiency is long, and the straw after enrichment still needs toIt is further processed, it is difficult to take effect in a short time.Chemical remediation is then by adding modifying agent, a fixed huge sum of money into contaminated soilBelong to, is restorative procedure more universal and quick at present to reduce absorption of the plant to heavy metal.Common modifying agent has stoneAsh, natural crystal, calcium magnesium phosphate, biological straw etc..
Currently, it is more for single heavy metal contaminated soil conditioner type, for cadmium-mercury combined pollution soilConditioner is few, as patent (application number: 201310265005.2) discloses a kind of Cadmium in Soil conditioner and preparation method thereof and answersWith, it specifically disclosing red mud, stalk, lime, phosphate fertilizer etc. and is applied in combination, major technique is the reduction effective cadmium content of soil, butOther heavy metals such as repairing effect is single, can not fix mercury.
Summary of the invention
For this purpose, the embodiment of the present invention provides one kind can repair cadmium-mercury combined contamination soil conditioner and its application simultaneouslyMethod, the conditioner dosage is small, do not influence soil texture and has long-term stability, to solve the problems of the prior art.
To achieve the goals above, embodiments of the present invention provide the following technical solutions:
In the first aspect of embodiments of the present invention, a kind of reparation cadmium-mercury combined pollution soil conditioning is providedAgent includes following raw material components according to parts by weight:
10-30 parts of sepiolite, 10-40 parts of silicide, 5-20 parts of charcoal, 5-20 parts of kaolin, thio sulfide 5-20Part.
Preferably, the sepiolite is powdery clay mineral.
Preferably, the silicide is silicate, specifically uses calcium silicates or sodium metasilicate.
Preferably, the charcoal is powdery solid charcoal particle.
Preferably, the kaolin is the nonmetallic mineral based on kaolinite.
Preferably, the thio sulfide is thiosulfate, specially sodium thiosulfate or calcium thiosulfate.
In embodiments of the present invention other side, a kind of reparation cadmium-mercury combined pollution soil tune is additionally providedAgent application method is managed, is included the following steps:
Step 1: take it is to be repaired containing cadmium-mercury contaminated soil, it is spare；
Step 2: configured soil conditioner being added described extremely dirty containing cadmium-mercury containing stirring in cadmium-mercury contaminated soilDye soil with soil conditioner is full and uniform mixes；
Step 3: the soil after being repaired after stabilizing maintenance 10-12 days.
Preferably, the adding proportion of the soil conditioner is the 0.05%- containing cadmium-mercury contaminated soil quality per acre0.5%.
Embodiments of the present invention have the advantages that
The present invention can repair cadmium-mercury combined contamination soil simultaneously, and dosage is small, do not influence soil texture, has long-acting stabilizationProperty；
Soil conditioner of the invention is able to achieve to cadmium in soil-mercury combined pollution in-situ immobilization, is reduced in soilCadmium-mercury biological effectiveness；This technology is made using environmentally friendly raw material, is had long-term stability, be can effectively prevent stabilizationThe heavy metal of change discharges again, and for this technology additive amount within 0.5%, additive amount is few, can guarantee soil original structure not byIt destroys.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanationContent disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention oneSection Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doingEvery other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Embodiment 1:
The parts by weight component of soil conditioner of the present invention are as follows:
20 parts of sepiolite, 35 parts of silicide, 10 parts of charcoal, 20 parts of kaolin, 15 parts of thio sulfide.
Above-mentioned each component is uniformly hybridly prepared into conditioner.
Take it is to be repaired configured soil conditioner is added in above-mentioned soil containing cadmium-mercury contaminated soil, stirring is extremelyContaminated soil with conditioner is full and uniform mixes, the soil after being repaired after stabilizing maintenance 10 days.
Embodiment 2:
The parts by weight component of soil conditioner of the present invention are as follows:
30 parts of sepiolite, 10 parts of silicide, 20 parts of charcoal, 20 parts of kaolin, 20 parts of thio sulfide.
Above-mentioned each component is uniformly hybridly prepared into conditioner.
Take it is to be repaired configured soil conditioner is added in above-mentioned soil containing cadmium-mercury contaminated soil, stirring is extremelyContaminated soil with conditioner is full and uniform mixes, the soil after being repaired after stabilizing maintenance 10 days.
Embodiment 3:
The parts by weight component of soil conditioner of the present invention are as follows:
10 parts of sepiolite, 40 parts of silicide, 15 parts of charcoal, 20 parts of kaolin, 15 parts of thio sulfide.By above-mentioned each groupDivide and is uniformly hybridly prepared into conditioner.
Take it is to be repaired configured soil conditioner is added in above-mentioned soil containing cadmium-mercury contaminated soil, stirring is extremelyContaminated soil with conditioner is full and uniform mixes, the soil after being repaired after stabilizing maintenance 10 days.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at thisOn the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.