RU2718805C1 - Multilayer membrane with drainage element - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention relates to hydraulic engineering and nature protection construction and can be used in making anti-filtration and drainage coatings on polygons of solid domestic, industrial and municipal wastes in order to protect soil, ground and underground water from contamination, as well as centralized discharge of liquid filtrate. Multilayer imperfection coating with drainage element includes preparation of soil base 1, laying of anti-filtration element 2 of bentonite mats, laying of protective layers 3, drainage element 4, represented by composite material consisting of two layers of non-woven geotextiles, between which there are polymer perforated drain tubes with perforation in upper part. Draining element 4 in multilayer screen is arranged with inclination towards water intake collector in order to efficiently collect and centralize discharge of liquid filtrate. At the same time filtrate drainage from drainage element is made to water intake collector arranged near end part of tubes, with subsequent collection of filtrate into settling pond.

EFFECT: use of multilayer imperfection coating with drainage element will allow to create combined screens on wastes accumulators, which enable not only to provide high anti-filtration effect, but also simultaneous removal of filtered liquid through system of drain devices made in composition of coating.

4 cl, 3 dwg

Description

The invention relates to hydraulic engineering and environmental construction and can be used to create antifiltration and drainage coatings on solid domestic, industrial and municipal waste landfills in order to protect soil, groundwater and groundwater from pollution, as well as centralized drainage of liquid filtrate.

A known method of creating an impervious coating on liquid waste storage devices (RU 2555450, 06/08/2018), including preparing a soil base, applying a protective layer on it placed between two layers of geotextile, laying a layer of mineral soil and treating its surface with a fixative based on a polymer liquid emulsion, made from polyisobutylene waste. In this case, a mixture of sodium and calcium bentonite clay in the ratio of 75% Na-bentonite and 25% Ca-bentonite is used as a protective layer.

The disadvantage of this technical solution is the complexity of the work, which consists in treating the surface of the soil with a polymer liquid emulsion, mixing it, and subsequent compaction. In addition, when such a design is installed on waste storage devices, it is not possible to discharge the liquid filtrate formed during the storage of waste, as well as due to the accumulation and filtering of precipitation.

A known method of creating an impervious screen with a geomembrane made of a polymeric material (RU 2374386, publ. 11/27/2009), including preparing a soil base, laying a waterproof geomembrane on it, consisting of hermetically connected panels of polymer material, making expansion joints for deformations, installing a protective screen layer from soil or other materials.

A drawback of the structural and technical solution is the complexity of the work on the implementation of strain compensators, the low efficiency of the anti-filtration element from the geomembrane, and the lack of the ability to drain the liquid filtrate and the filtered precipitation on the storage tanks. In addition, the polymer geomembrane used in the anti-filter screen without the installation of additional protective layers and gaskets will be susceptible to damage by waste during storage and compaction.

The closest technical solutions is a combined antifiltration screen (RU 2579482, 06/10/2018), including an antifiltration coating made of polymer high-strength geomembrane, laying it on a prepared sand base, a drainage layer of glauconite sand thick with a woven geotextile coating, a device on top woven geotestile protective layer.

The disadvantage of the technical solution is the low efficiency of the drainage layer of glauconite sand, the impossibility of a centralized drainage of the filtrate on waste storage. There is also the possibility of flushing out the sand layer by the filtration flow. In addition, an anti-filter screen made of geomembrane arranged on waste storage devices will be characterized by low reliability and efficiency, due to the possible formation of damage in the polymer sheet.

The purpose of the invention is the creation of a highly effective coating on waste storage, providing anti-filter protection of underlying soils, groundwater, as well as the simultaneous collection and removal of filtered filtrate into the water intake manifold.

The task to be solved by the claimed invention is directed is the development of a combined multilayer antifiltration coating with a draining element arranged on waste collectors for various purposes.

The technical result to which the claimed invention is directed is to create a multi-layer antifiltration coating with a drainage element, which provides high reliability and water resistance at the base of the drives, collection and centralized removal of contaminated filtrate through the use of a drainage element.

The technical result is achieved by creating a multilayer antifiltration coating with a drainage element, including the preparation of a soil base, laying of antifiltration material and protective layers, an antifiltration element made of bentonite mats laid on a previously prepared soil base, a protective sand layer is deposited on top of bentonite mats, on which a drainage element is laid out, represented by a composite material consisting of two layers of non-woven geote style, between which the polymeric perforated drainage pipe with perforations in the upper part, wherein the bottom panel is connected to the geotextile polymer layer of the geomembrane, and a second drainage element is laid sand layer protective coating. The connection of the two layers of non-woven geotextiles in the drainage element is made by threads, and the polymer geomembrane with geotextiles is made by heat bonding. The drainage element in the multilayer screen is arranged with a slope towards the water intake manifold with the aim of the most efficient collection and centralized drainage of the liquid filtrate. In this case, the filtrate is removed from the drainage element to a water intake manifold located near the end of the tubes, followed by the collection of the filtrate in a settling pond.

The invention is illustrated by the following drawings: FIG. 1 - Design of a multilayer antifiltration coating with a drainage element on the drive; FIG. 2 - Draining composite element; FIG. 3 - The scheme of the drainage element in the combined coating.

The numbers in the drawings indicate: 1 - prepared soil base; 2 - antifiltration element; 3 - sand layer; 4 - drainage element; 5 - non-woven geotextile; 6 - perforated polymer tubes; 7 - thermal bonding; 8 - polymer geomembrane; 9 - fastening with threads; 10 - water intake manifold; 11 - settling pond; 12 - waste.

A multilayer antifiltration coating with a draining element is made as follows (Fig. 1, 2).

During the construction of waste accumulators (mainly solid household), the foundation provides for the installation of antifiltration and drainage layers that provide protection from filtration on the lower horizons on the one hand and, on the other hand, centralized removal of filtered precipitation and liquid filtrate from the landfill body. For these purposes, a multilayer coating is created, for the device of which the following operations are performed. The preparation of the soil base 1 is carried out, consisting in its compaction, removal of acute-angle and large inclusions, vegetation and debris. For the purpose of antifiltration protection, an antifiltration element of geocomposite bentonite mats 2 is laid on the prepared soil base 1, on top of which a protective and separating layer of sand is deposited 3. In order to divert the liquid filtrate and precipitation from the body of the accumulator, a drainage element 4 is laid over the sand layer 3, which is geocomposite made of two layers of non-woven geotextile 5 between which perforated in the upper part are located throughout the coating area 6. In this cutting to avoid filtering bottom (reinforcing) layer of geotextile 5 7 tersmoskreplen polymer waterproof material in the form of 8 geomembrane and the geotextile bonded nonwoven webs 9 yarns.

A multilayer antifiltration coating with a draining element works as follows (Fig. 3).

During the operation of the drives and during the storage of waste, various processes take place, including those associated with the filtering of precipitation and the formation of liquid filtrate in the body of the drive. In order to drain the filtered liquid, a combined anti-filtration and drainage coating is created, including anti-filtration 2 and drainage 4 elements. The filtrate, penetrating through the upper cloth of the non-woven geotextile 5, enters the polymer tubes 6 perforated in the upper part, and the polymer geomembrane 8, thermally bonded 7 with the non-woven lower cloth of geotextile 5 prevents further filtration of the liquid into the underlying horizons. By means of polymer tubes 6, the liquid filtrate is centrally discharged to a drainage collector 10 located near the end of the tubes 6, followed by the collection of the filtrate in a settling pond 11. Thus, the problem of anti-filtering protection of waste accumulators at the base is simultaneously solved, and centralized collection and discharge is realized liquid filtrate.

The use of a multilayer antifiltration coating with a draining element will allow the creation of combined screens on waste collectors, which allow not only to provide a high antifiltration effect, but also the simultaneous removal of filtered fluid through a system of drainage devices made as a part of the coating.

Claims (4)

1. A multilayer antifiltration coating with a drainage element, including preparation of a soil base, laying of antifiltration material and protective layers, characterized in that the coating consists of an antifiltration element made of bentonite mats laid on a previously prepared soil base, a protective sand layer is deposited on top of bentonite mats on which a drainage element is laid, represented by a composite material consisting of two layers of non-woven geotextile, m which are located forward polymeric perforated drainage pipe with perforations in the upper part, wherein the bottom panel is connected to the geotextile polymer layer of the geomembrane, and a second drainage element is laid sand layer protective coating. 2. The multilayer antifiltration coating according to claim 1, characterized in that the connection of the two layers of non-woven geotextile in the drainage element is made of threads, and the polymer geomembrane with geotextile is thermally bonded. 3. The multilayer antifiltration coating according to claim 1, characterized in that the drainage element in the multilayer screen is arranged with a slope towards the water intake manifold for the most efficient collection and centralized removal of the liquid filtrate. 4. The multilayer antifiltration coating according to claim 1, characterized in that the filtrate is removed from the drainage element to a water intake manifold located near the end of the tubes, followed by collection of the filtrate into a settling pond.

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