Cleaning of fouled surface run-off from motor road surface

FIELD: process engineering.

SUBSTANCE: invention relates to ecology and environmental protection. For cleaning filtering system is erected and used on soil slope surfaces. Filtering system is composed of the slope soil top layer processed with aqueous solution of polyelectrolyte complex. The latter comprises the mix of hydrolysed polyarcylonitrile and polyethylene polyamine at the ratio of 1:3.5-1:4.5, wt %. Processed soil sorption capacity saturated, said soil is removed and disposed or recovered.

EFFECT: simplified cleaning, higher erosion resistance of run-off surfaces.

2 tbl

 

The invention relates to the field of environmental protection, namely to reduce pollution of water bodies by runoff from the surface of roads.

Known way to protect the water body (pond, stream) from pollution, including the device in the body of the array of the slope of the water body drainage elements in one or more tiers, consisting of workers and outlet parts, and technical facilities. With each technical grounds in the array of the slope below the outlet parts of the drainage elements arrange the collection bins with hinged lids to intercept a filtered ground water flow contaminated with harmful substances, which produce the pumping of contaminated prefiltermessage baseflow. The method provides improved protection of the water body (water body) from the ingress of contaminants from contaminated ground water (see RF patent №2392375, IPC E02B 3/04, publ. 2010).

The disadvantages of this method is the need for subsequent purification of contaminated wastewater and the need for expenditure on the construction and maintenance of prefabricated containers.

The known method, implemented in the system of drainage and treatment of surface runoff of rainwater, snow melt and sprinkling water from the surface of roads, Railways, zastron�x territories industrial areas, etc., adopted as a prototype. Method is to collect surface runoff with the waterproofing system, drainage reservoirs, with subsequent gross and subtle treatment of waste water by sedimentation in a settling chamber and additional filtration in the filtration chambers with the use of multilayer natural filter material, after which the cleaned runoff enters the shallow plateau (see RF patent №2200802, IPC E03F 1/00, publ. 2003). The method allows for the purification of runoff from large mechanical impurities, suspended particles and associated petroleum products.

The disadvantage of this method is the lack of clean runoff with dissolved metals and the complexity of the ongoing process of purification through the construction of complex hydraulic components of the cleaning system.

An object of the invention is to simplify the process of purification of surface runoff due to the construction and use of simpler filtration systems with high sorption capacity, as well as improving the quality of cleaning due to the treatment of surface runoff from dissolved metals while improving the erosion resistance of the surface slopes.

The solution of the technical problem set�under the implementation of the method of cleaning contaminated surface runoff from the roadway of highways, including creation and use of a filtering system on the surface of the ground slopes, according to the invention as filtering systems use the upper soil layer slope, treated with an aqueous solution of polyelectrolyte complex containing a mixture of hydrolyzed polyacrylonitrile and polyethylene polyamine in a weight ratio of 1:3.5-4.5, after saturation of the sorption capacity of the treated soil is removed and disposed of or regenerated.

The stated technical problem is solved by the use of the filter system of the soil of the slopes of the roadway, which does not require additional construction of slopes. In addition, the components of the aqueous solution, which handles the top layer of soil, are readily available substances. The process of preparation of polyelectrolyte complex is not particularly difficult. That is, compared with the prototype simplifies the process of purification of polluted surface runoff. The actual evaluation showed that the soil be soaked in a water solution, has a high sorption capacity for a considerable period of use. In addition, a layer of soil allows it to retain suspended solids and oil products contained in the wastewater, and, binding soil particles betwe�th, increases erosion resistance of slopes of roads.

Method for cleaning contaminated surface runoff from the roadway of highways includes the building and the use of filtering systems on the surface of the ground slopes. According to the invention as filtering systems use the upper soil layer slope, treated with an aqueous solution of polyelectrolyte complex containing a mixture of hydrolyzed polyacrylonitrile and polyethylene polyamine in a weight ratio of 1:3.5-4.5. After saturation of the sorption capacity of the treated soil is removed and disposed of or regenerated.

The method is implemented as follows.

Polluted runoff comes from surface roads in the warmer in a filtering system, i.e. on the clay slope, which is in advance with road equipment treated with an aqueous solution of polyelectrolyte complex containing a mixture of hydrolyzed polyacrylonitrile and polyethylene polyamine, maintaining their mass ratio of 1:3.5 to 4.5 depending on the soil type (table 1). Contained in surface runoff from roads heavy metal ions to form a particularly stable polyamine (chelate) compounds, making the heavy metal ions unavailable to plants. The oil and suspended �of exista delayed upper layer of the treated soil due to the buffering ability of the soil. In addition to its direct function of the applied polyelectrolyte complex also plays the role of dust precipitation of the binder, which has a positive effect on the erosion resistance

When the system is "polyelectrolyte complex+soil" is approaching its saturation sorption capacity, it must be removed from roadside slopes and to recycle or regenerate. Soil treatment may be performed in the following ways: disposal of contaminated soil; regeneration with the use of natural sorbents, the use of biological methods of cleaning; mixing contaminated soil with clean soil to obtain the necessary values for polluting component; the extraction of heavy metals using techniques based on electrochemical methods; the regeneration of the soil with chemical reagents, such as nitric acid, in the apparatus with fluidized bed.

In the following Table 2 shows the results of experiments to determine the quality treatment of surface runoff from a number of heavy metal ions, as well as the actual sorption capacity filtration system for each metal, depending on the soil type and its percentage saturation of per year.

It is assumed that the polyelectrolyte complex will coredata�n in the upper soil layer slope with a height of 2 cm. The consumption of polyelectrolyte complex on an area of 1 ha of slopes will be 50 kg.

For given in the table of soil types it can be concluded that the pollutants addressed by the system "polyelectrolyte complex+soil" is very effective, and the minimum period of service before reaching the saturation sorption capacity in the case of sand will be about 10 years, in the case of the most common types of soils - sandy loams and loams, this period of 20-25 years.

The quality of purification from oil products and suspended solids were determined depending on the buffer capacity of the soil and is of the order of 75-80% for petroleum products, 80-85% for suspensions, respectively.

The advantages of this invention lies in the simplicity of preparation of the filter composition and its use, availability of components of the polyelectrolyte complex, and in the absence of the necessity of the construction in the right of way engineering structures that require significant design and operational costs during construction and subsequent operation. Furthermore, the invention is characterized by a high ion exchange capacity, increase the efficiency of sorption of heavy metals, and treatment of surface runoff from oil and suspended solids due to the buffering properties of the soil.

Received polyelectro�litnym complex can be diluted with water, instead of salt solutions, thus avoiding soil salinity. In addition, the polyamine forms a particularly stable (chelate) complexes with heavy metal ions, making them unavailable to plants.

Also polyelectrolyte complex binds particles of the treated soil between them, increases erosion resistance of slopes of roads.

Thus, the invention allows to simplify the purification process of polluted surface runoff from road surfaces roads due to the construction and use of simpler filtration systems with high sorption capacity, as well as to improve the quality of treatment due to the treatment of surface runoff from dissolved metals, while improving the erosion resistance of the surface slopes.

Method for cleaning contaminated surface runoff from the roadway of highways, including construction and use of a filtering system on the surface of the ground slopes, characterized in that the filter systems use the upper soil layer slope, treated with an aqueous solution of polyelectrolyte complex containing a mixture of hydrolyzed polyacrylonitrile and polyethylene polyamine in a weight ratio of 1:3.5-4.5, after saturation of the sorption capacity of the treated �of soil removed and disposed of or regenerated.



 

Same patents:

FIELD: construction.

SUBSTANCE: body of a water-diversion ditch comprises two substantially identically formed surface blocks, namely: a bottom block and a substantially identically formed cover block, which with the help of spacing elements are connected to each other at the mounting distance. Surface blocks are proposed to be made substantially as capable of engagement when laid into stacks, so that the mounting distance of the surface blocks is considerably more than their distance when laid into a stack. Spacing elements are substantially shaped in the form of a truncated cone or a truncated pyramid, with a limited surface of the cross section, which with increased distance from the surface blocks becomes less. The first alternative version may include placement of the spacing elements on the surface units so that bottom blocks and bottom covers are laid as overlapping each other according to the type of stonework tying. The second alternative version may provide for overlapping connection of the bottom blocks and the cover blocks to each other according to the type of stonework tying.

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FIELD: machine building.

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13 cl, 7 dwg

FIELD: oil and gas industry.

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FIELD: construction.

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FIELD: ecology.

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2 cl, 2 dwg

FIELD: ecology.

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2 dwg

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FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry. Mixed coagulant from mineral raw material is obtained by dissolution of boehmite-kaolinite bauxide in autoclave with hydrochloric acid with concentration 220 g/l with ratio S:L=1:6 for 1-3 hours in interval of temperatures 150-180°C.

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2 dwg, 6 tbl

Vacuum deaerator // 2558109

FIELD: power industry.

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3 dwg

FIELD: testing equipment.

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2 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to a polymer obtained via condensation polymerisation. The polymer is obtained from at least two monomers: acrylic monomer and alkylamine. Said polymer is modified such that it contains a dithiocarbamate salt group capable of cleaning one or more compositions containing one or more metals. The polymer has molecular weight of 500-200000.

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13 cl, 5 ex, 1 dwg

FIELD: chemistry.

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EFFECT: invention provides obtaining almost pure fresh water.

19 cl, 15 dwg, 2 ex

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