Method of reclamation of soil contaminated with oil and/or petroleum products

 

(57) Abstract:

The invention relates to the technology of environmental protection and rational use of natural land resources, namely, to restore contaminated soil. Method of reclamation involves the stages of mixing soil contaminated with oil and/or petroleum products with bird manure, organic waste and wood waste, in the following ratio, wt.%: contaminated soil from 45 to 72, bird droppings - 15-40%, organic waste 3-8% and wood waste 9-27%; composting for a period of not less than 10 months and sortowanie with the subsequent holding period of not less than 10 months. The technical result consists in the possibility of remediation of heavily contaminated soils, reducing energy consumption and cost of remediation solutions, as well as additional functionality for processing of industrial wastes of human activity. 7 C.p. f-crystals.

The invention relates to the technology of environmental protection and rational use of natural land resources, namely, to restore contaminated soil.

Currently ODI using bacterial preparations with the introduction of mineral and/or organic fertilizer and seeding mixtures (for example, RF patent №2193464, the IPC 09 With 1/10, 2002).

To obtain the desired technical result prevents uncontrolled application of mineral fertilizers and biological products, which may become an additional threat for the functioning of soil ecosystems.

There is a method of bioremediation of land, including the land application of granulated organic-mineral biologically active inoculum obtained by microbiological transformation mixture of lignin-sawdust-bird droppings and enriched mineral fertilizers [RF patent №2093971, IPC And 01 In 79/02, 1997].

Obtaining the required technical result is prevented by the complexity of the preparation process of the material used as a biological activator.

Closest to the claimed method (prototype) is a method of cleaning soil from oil pollution in patent No. 2175580, the IPC 09 With 1/10, 2001, including its mixing with the composition containing wood waste and manure. In the composition for cleaning soil, in addition to wood waste (adsorbent) and manure, includes activated sludge sewage treatment facilities, refineries, selected from raspredelitelnogo of the hampers limited use method due to the use of the component, produced only in limited locations of oil refineries.

The problem to which the invention is directed, is to develop inexpensive and efficient method for the remediation of soils that are heavily contaminated with oil and oil products, based on the use of natural components.

The technical result in the implementation of the claimed invention is expressed in the possibility remediation of heavily contaminated soils, reducing energy consumption and cost of remediation solutions, as well as additional functionality for processing of industrial wastes of human activity.

To achieve the above technical result in the method of reclamation of soil contaminated with oil and/or petroleum products, including its mixing with wood waste and dung as manure use poultry manure and also add organic waste, in the following ratio, wt.%: contaminated soil from 45 to 72, bird droppings - 15-40%, organic waste 3-8% and wood waste 9-27%, spend composting for a period of not less than 10 months, and then osushestvliayut portions disposable portions is not more than 20 wt.%, with an interval or intervals of not less than 30 days in the period from April to September. As organic waste can be used organic wastes from food production. Mixing produce, for example, by the method of ploughing.

Composting produces a layer not more than 60 see Sortowanie produce with the formation of bulk rolls up to 1.5 m as wood waste can be used as wood chips and/or sawdust.

Reduction of energy intensity in the present method is achieved by successive stages of mixing, composting with endurance and sortowanie with endurance. The duration of the process of remediation of soil contaminated by oil, is roughly 2 years. But taking into account seasonality (winter period) and a reduction of the occupied area by sortowanie during the 2-year overall energy consumption of the process and the complexity of its maintenance is reduced compared to known methods. The use of the composition for remediation of bird droppings, wood and organic waste additionally solves the problem of disposal of these wastes. Poultry manure contains necessary neftereklama (Neftekhimiya) organisms in sufficient KOLIZEY soil (more than 5 maximum permissible concentrations (MPC) without pre-treatment. Of all types of manure poultry manure is the most troublesome and difficult when used as fertilizer, and in the inventive method, poultry litter can be used in fresh form without additional processing.

Wood waste in the form of sawdust or shavings are designed to provide aeration and composting, as well as for immobilization aftershave culture.

Adding organic additives stimulates the catalase activity of redox enzymes associated with oxidative decomposition of petroleum products and crude oil in the soil.

The method according to the present invention is as follows. To implement the method chosen is unsuitable for agricultural activities land to create it agronomic cards phased cleanup of soils. Contaminated with oil and/or petroleum products soil is delivered to a selected area. To create rekultiviruemye compost using farming mixed soil contaminated with oil and/or petroleum products, poultry manure, organic waste and wood waste, in the following ratio, wt.%: contaminated soil from 45 to 72, bird droppings - 15-40% organically is 20 wt.% with an interval or intervals of not less than 30 days. Addition of poultry litter should be carried out in the period from April to September. Mixing is usually carried out by ploughing. Then over a period of not less than 10 months carry out composting to their respective neftepolimernykh, microbiological and biochemical processes. For cleaning 5 m3contaminated soil requires 15 m2the waste land. Taking into account the seasonality of agricultural work preferably stage of composting is done for one year. The optimal layer composting should not exceed 60 cm) to ensure proper aeration. Then carry out sortowanie with the subsequent holding period of not less than 10 months, while sortowanie produce with the formation of bulk rolls up to 1.5 meters

As organic waste can be used organic wastes from food production, such as waste from meat processing plants. As wood waste is usually wood shavings and/or sawdust, because they provide the necessary aeration during composting due to the large surface.

During the whole period of remediation is monitored and measured chemical soil.

If, after the stage of composting in the soil observed the remnants of the oil and/or petroleum products, then the cycle repeats.

1. Method of reclamation of soil contaminated with oil and/or petroleum products, including its mixing with wood waste and manure, characterized in that the quality of manure use poultry manure and also add organic waste in the following ratio, wt.%: contaminated soil from 45 to 72, bird droppings - 15-40, organic waste 3-8 and wood waste 9-27, conduct composting for a period of not less than 10 months, then carry out sortowanie with the subsequent holding period of not less than 10 months.

2. Method of reclamation of soil contaminated with oil and/or petroleum products under item 1, characterized in that bird droppings add portions of the one-time portions is not more than 20 wt.%.

3. Method of reclamation of soil contaminated with oil and/or petroleum products under item 2, characterized in that bird droppings add interval or intervals of not less than 30 days in the period from April to September.

4. Method of reclamation of soil contaminated with oil and/or petroleum products under item 1, characterized in that catastali soil, contaminated with oil and/or petroleum products under item 1, characterized in that the stirring produced by the method of ploughing.

6. Method of reclamation of soil contaminated with oil and/or petroleum products under item 1, characterized in that the composting produce a layer no more than 60 cm

7. Method of reclamation of soil contaminated with oil and/or petroleum products under item 1, characterized in that sortowanie produce with the formation of bulk rolls up to 1.5 meters

8. Method of reclamation of soil contaminated with oil and/or petroleum products under item 1, characterized in that as waste wood use wood chips and/or sawdust.



 

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FIELD: environment protection.

SUBSTANCE: method involves mechanical removal of excessive contaminants from surface and reducing toxicity of contaminated soil; sowing green manure crops and perennial grasses; preliminarily removing taking soil samples from contaminated surface and separating native contaminant destructors therefrom; after mechanical removal of contaminant from soil surface, providing sequential treatment of plot soil with water-soluble humates and at least double treatment with native contaminant destructors; mellowing soil; applying lime with mineral fertilizers such as saltpeter, double superphosphate and calcium chloride. Green manure crops are sown after application of fertilizers. Method further involves grinding green manure crops, plowing into soil and covering with soil by means of covering roll.

EFFECT: increased efficiency, reliable ecologically clean restoration of soil after contamination thereof.

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