CN105618478A

CN105618478A - Biological soil remediation agent and method for remediating soil

Info

Publication number: CN105618478A
Application number: CN201610181396.3A
Authority: CN
Inventors: 耿传超
Original assignee: Nanjing Gaia Biological Engineering Co Ltd
Current assignee: Nanjing Gaia Biological Engineering Co Ltd
Priority date: 2016-03-24
Filing date: 2016-03-24
Publication date: 2016-06-01

Abstract

The invention discloses a biological soil remediation agent which is prepared by mixing a solid passivator and a microbic solution according to the volume-weight ratio of 1:(15-30) (L/kg). The solid passivator comprises the following ingredients in percent by mass: 50-60 percent of clay carrier, 15-30 percent of diatomite, 10-15 percent of humic acid and 10-20 percent of charcoal. The microbic solution comprises a non-spore forming bacterium and streptomyces microflavus. The biological soil remediation agent can be used for remediating a soil ecosystem, improving the crop growth environment, effectively passivating heavy metal pollutants, such as lead, and reducing the availability for plants.

Description

A kind of method of biological soil renovation agent and rehabilitating soil thereof

Technical field

The present invention relates to a kind of method of biological soil renovation agent and rehabilitating soil thereof.

Background technology

Along with the fast development of industry and the continuous increase of countryside tax system intensity, organic pollutant and the heavy metal contaminants of a large amount of difficult degradation enter edatope, thus caused the severe contamination of soil, particularly the heavy metal in soil enters food chain by plant absorption, and then HUMAN HEALTH is formed serious threat. The intrusion of various pollutent causes soil microorganisms kind and quantity minimizing, Soil structure and ecosystem destruction, crops quality decline, disease and pest increase. This has become one by the global problem of extensive concern.

Remediation contaminated soil method conventional at present has physical method and the chemical process such as biological reducing method, complex compound extraction such as leaching method, absorption fixation method. Physical method takes effect slowly, though chemical process soon but easily brings secondary pollution. Therefore a kind of instant effect, free of contamination soil-repairing agent and reparation method it is badly in need of.

Summary of the invention

It is an object of the invention to provide a kind of method of biological soil renovation agent and rehabilitating soil thereof, this soil-repairing agent can not only the rehabilitating soil ecosystem, improve crop growth environment, moreover it is possible to effective heavy metal-passivated pollutent, reduce it to the validity of plant.

For solving the problems of the technologies described above, the technical solution used in the present invention is:

A kind of biological soil renovation agent, by solid passivator and microorganism liquid by 1:15-30(L/kg) envelope-bulk to weight ratio mixes, described solid passivator is by the clay carrier 50-60% of mass percent, diatomite 15-30%, humic acids 10-15% and charcoal 10-20% forms, and described microorganism liquid is made up of non-spore forming bacteria and streptomyces microflavus.

Humic acids and humic acids ore deposit powder directly obtain through ball milling by its raw ore, is the natural polymer organic polymer of a kind of complex structure.

Preferably, the one that described non-spore forming bacteria is selected from genus bifidobacterium, Brevibacillus, Flavobacterium, lactobacillus and lactococcus.

Preferably, in described microorganism liquid, the living bacteria count of thalline is greater than 200,000,000/milliliter.

Preferably, described charcoal is coconut husk base charcoal.

Preferably, described clay carrier be selected from attapulgite, wilkinite, sepiolite and mullite one or more.

A kind of method utilizing the biological soil renovation agent rehabilitating soil described in claim 1, it is characterised in that, comprise the following steps:

Biological soil renovation agent is added in soil to be repaired with the massfraction of 1.0-8.5%, add water to the 60-70% of field soil saturation moisture capacity, moisture loss is prevented with plastic film covering, and on film, offer some ventages, within every 5-7 days, in soil, inject air, and supplement the moisture scattered and disappeared in time, the soil after must repairing after 30-60 days.

The useful effect that the present invention reaches:

The soil-repairing agent of the present invention can the rehabilitating soil ecosystem, improve crop growth environment, moreover it is possible to effective heavy metal-passivated pollutent, such as lead, reduce it to the validity of plant;

Clay carrier is mainly used as the absorption carrier of thalline in microorganism liquid, and diatomite, humic acids and charcoal can heavy metal contaminants in passivation fixing soil; Simultaneously charcoal and diatomite add to after in soil because of the singularity of its structure, also can obviously increase soil pores, be conducive to microbial growth in the growth of root system of plant and soil, within in soil remediation method about one week, once lead to soil and also can strengthen gas fluidity into air, promote that thalline is to the degraded of soil pollutant, accelerates soil remediation.

Embodiment

Below in conjunction with specific embodiment, the invention will be further described. Following examples are only for clearly illustrating the technical scheme of the present invention, and can not limit the scope of the invention with this.

Embodiment one

First soil-repairing agent is prepared, by 50% clay carrier, 20% diatomite, after 15% humic acids and 15% coconut husk base charcoal mix, spray into microorganism liquid wherein, spraying 1L microorganism liquid by 30kg solid passivator (referring to the mixture of above-mentioned diatomite, humic acid and charcoal), alleged microorganism liquid is made up of Brevibacillus and streptomyces microflavus. In microorganism liquid, the living bacteria count of thalline is greater than 200,000,000/milliliter.

Then learn from else's experience polluted soil near paper mill, and add containing Lead contamination thing wherein, be in soil lead concentration at about 3900mg/kg, by above-mentioned soil-repairing agent be in mass ratio finally 2% ratio add in this contaminated soil, add water to the 60% of field soil saturation moisture capacity, prevent moisture loss with plastic film covering, and on film, offer some ventages, within every 7 days, in soil, inject air, and supplement the moisture scattered and disappeared in time, the soil after must repairing after 50 days.

Embodiment two

First soil-repairing agent is prepared, by 60% clay carrier, 20% diatomite, after 10% humic acids and 10% coconut husk base charcoal mix, spraying into microorganism liquid wherein, spray 1L microorganism liquid by 20kg solid passivator, alleged microorganism liquid is made up of Brevibacillus and streptomyces microflavus. In microorganism liquid, the living bacteria count of thalline is greater than 200,000,000/milliliter.

Then learn from else's experience polluted soil near paper mill, and add containing Lead contamination thing wherein, make in soil lead concentration at about 3900mg/kg, by above-mentioned soil-repairing agent be in mass ratio finally 5% ratio add in this contaminated soil, add water to the 70% of field soil saturation moisture capacity, prevent moisture loss with plastic film covering, and on film, offer some ventages, within every 7 days, in soil, inject air, and supplement the moisture scattered and disappeared in time, the soil after must repairing after 60 days.

Embodiment three

First soil-repairing agent is prepared, by 55% clay carrier, 25% diatomite, after 10% humic acids and 10% coconut husk base charcoal mix, spraying into microorganism liquid wherein, spray 1L microorganism liquid by 30kg solid passivator, alleged microorganism liquid is made up of Brevibacillus and streptomyces microflavus. In microorganism liquid, the living bacteria count of thalline is greater than 200,000,000/milliliter.

Then learn from else's experience polluted soil near paper mill, and add containing Lead contamination thing wherein, make in soil lead concentration at about 3900mg/kg, by above-mentioned soil-repairing agent be in mass ratio finally 3% ratio add in this contaminated soil, add water to the 70% of field soil saturation moisture capacity, prevent moisture loss with plastic film covering, and on film, offer some ventages, within every 7 days, in soil, inject air, and supplement the moisture scattered and disappeared in time, the soil after must repairing after 40 days.

Comparative example

Learn from else's experience polluted soil near paper mill, and add wherein containing Lead contamination thing, make in soil lead concentration at about 3900mg/kg, non-rehabilitating soil.

Above-described embodiment 1-3 and comparative example gained soil carry out willow herb planting experiment, after its maturation, observes plant growth condition, and gather in the crops lead content in post analysis plant.

Method well known to those skilled in the art was all used with last measuring.

Experimental result discovery, embodiment one is good through the upgrowth situation of the soil willow herb of reparation to embodiment three, embodiment three most preferred embodiments, and plant strain growth is the most luxuriant, and in comparative example, the willow herb of growth is short and small, even withers and dies. Lead tolerance test finds, embodiment one does not detect lead in the plant in embodiment three, and the lead content of different concns detected in willow herb plant in comparative example.

By finding out above, compared with comparative example, soil after the present invention's reparation, greatly reduce the validity of heavy metal on plants, heavy metal is made to obtain good passivation, and it is short to repair the time used, the technical scheme of the present invention can be good at contaminated even soil by heavy metal contamination is carried out extraordinary reparation.

The above is only the preferred embodiment of the present invention; it is noted that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also making some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.

Claims

1. a biological soil renovation agent, it is characterized in that, by solid passivator and microorganism liquid by 1:15-30(L/kg) envelope-bulk to weight ratio mixes, described solid passivator is by the clay carrier 50-60% of mass percent, diatomite 15-30%, humic acids 10-15% and charcoal 10-20% forms, and described microorganism liquid is made up of non-spore forming bacteria and streptomyces microflavus.

2. a kind of biological soil renovation agent according to claim 1, it is characterised in that, the one that described non-spore forming bacteria is selected from genus bifidobacterium, Brevibacillus, Flavobacterium, lactobacillus and lactococcus.

3. a kind of biological soil renovation agent according to claim 1 and 2, it is characterised in that, in described microorganism liquid, the living bacteria count of thalline is greater than 200,000,000/milliliter.

4. a kind of biological soil renovation agent according to claim 1, it is characterised in that, described charcoal is coconut husk base charcoal.

5. a kind of biological soil renovation agent according to claim 4, it is characterised in that, described clay carrier be selected from attapulgite, wilkinite, sepiolite and mullite one or more.

6. one kind utilizes the method for the biological soil renovation agent rehabilitating soil described in claim 1, it is characterised in that, comprise the following steps: