CN111894097A

CN111894097A - Overhead type rigid landfill leachate collecting-drainage guide device

Info

Publication number: CN111894097A
Application number: CN202010691963.6A
Authority: CN
Inventors: 曹伟华; 王艳明; 李砚; 曹泳民; 吉红军
Original assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Current assignee: Shanghai Municipal Engineering Design Insitute Group Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-11-06

Abstract

The invention discloses an overhead type rigid landfill leachate collecting-draining device which is characterized by comprising a leachate collecting layer, a leachate impermeable layer, a leachate leakage detecting pipe and a leachate draining pipe. The landfill material enters the landfill unit of the rigid landfill site through the feeding system, leachate generated in the landfill unit is collected to a collecting pipe orifice at the center of the bottom of the landfill unit by a certain gradient through a leachate collecting layer, and is guided and discharged to a leachate collecting pit by a leachate guide and discharge pipe. The leachate leakage detecting pipe can find whether the leachate impervious layer is damaged or not in time and take remedial measures in time to prevent the leachate leakage from causing the environmental pollution around the reservoir area. The invention achieves the purpose of completely sealing the middle process of pollutants by collecting, detecting leakage and guiding and discharging leachate generated by a rigid landfill system, greatly improves the maintenance efficiency of the transport pipe and reduces the risk of environmental pollution.

Description

Overhead type rigid landfill leachate collecting-drainage guide device

Technical Field

The invention relates to the field of hazardous waste landfills, in particular to an overhead type rigid landfill leachate collecting-drainage guide device.

Background

Landfill disposal is an important component in the current hazardous waste disposal means, and is also an important supplement to the treatment means such as incineration and materialization. Leachate generated by the landfill system at present is an important factor in environmental pollution control, so leachate collection, drainage design and construction level need to be improved urgently.

Most of conventional landfill sites are flexible, and the leachate drainage mode mainly comprises that a drainage layer is formed by pebbles or broken stones at the bottom of a reservoir, HDPE floral tubes with certain pipe diameters are laid in the drainage layer, and a leachate collection pit is inclined at a gradient of more than or equal to 2%. The leachate drainage guide pipeline is arranged at the bottom of the reservoir in the drainage guide mode, and if seepage occurs due to damage of an impermeable layer at the bottom of the reservoir, the leachate drainage guide pipeline does not have overhauling practical operability, and brings great potential safety hazards to the environment.

In recent years, with the increasing production of domestic hazardous wastes, the site selection requirement of a safe landfill site is higher and tighter, and the construction requirement of a rigid landfill site is increasingly increased under the limitation of the site selection and the requirement of landfill objects. At present, a part of domestic leachate guide and discharge devices of rigid landfill sites adopt power lifting guide and discharge, so that the energy consumption is high, and the practical operability is poor. The practical, convenient and safe rigid landfill leachate collection and drainage guide device is very necessary to be researched.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide the leachate collecting and draining device for the overhead rigid landfill so as to achieve the purposes of completely sealing the middle process of pollutants, visualizing leachate leakage, greatly improving the maintenance efficiency of the transport pipe and reducing the risk of environmental pollution

In order to achieve the purpose, the technical scheme of the invention is as follows: an overhead rigid landfill leachate collection-drainage device, characterized in that the device comprises:

the leachate collection layer is paved at the bottom of the rigid landfill, and leachate generated by the rigid landfill is collected to the center of the bottom of the rigid landfill through the leachate collection layer after being infiltrated;

the leachate impermeable layer is arranged on the lower layer of the leachate collecting layer, and the HDPE geomembrane is adopted, so that leachate generated in the landfill unit can be prevented from seeping down to the wall of the rigid landfill pool, and the risk of environmental pollution is reduced;

leachate drainage guide pipe, including leachate collection standpipe and leachate collection violently pipe, leachate collection standpipe is located central authorities at the bottom of the rigid landfill storehouse, and HDPE geomembrane is worn on upper portion, and rather than the hot melt welding, and rigid landfill storehouse bottom plate is worn to the lower part, and leachate collection violently manages the built on stilts layer that is located rigid landfill storehouse below, and with collect standpipe hot melt welding.

Furthermore, the leachate collection layer adopts an HDPE geotechnical composite drainage net or an HDPE drainage plate.

Further, the thickness of the HDPE geomembrane is 1.5-2.5 mm.

Further, the device still includes leachate leakage checking pipe, and leachate leakage checking pipe is located leachate barrier layer downside, and collects horizontal union coupling with leachate.

Furthermore, the leachate leakage detection pipe adopts a perspective ABS resin pipeline, the tail end of the leachate leakage detection pipe is blocked by a blind plate, and the elevation of the leachate leakage detection pipe is lower than that of the leachate drainage guide pipe, so that visual detection is convenient to establish, and when leachate exists in the pipeline, the situation that the impermeable membrane of the landfill unit is damaged is indicated.

Furthermore, a waterproof sleeve is embedded in the bottom plate of the rigid landfill, and the leachate collecting vertical pipe penetrates through the waterproof sleeve.

The invention achieves the purpose of completely sealing the middle process of pollutants by collecting, detecting leakage and guiding and discharging leachate generated by a rigid landfill system, greatly improves the maintenance efficiency of the transport pipe and reduces the risk of environmental pollution. The invention has the advantages of less manual management, less operation environment risk, visual leakage detection and maintenance conditions of leachate and better market applicability. Compared with the prior art, the invention has the following beneficial effects:

1. the leachate leakage detection pipeline is positioned on the overhead layer, and has the conditions of visual detection and timely maintenance, so that the environmental pollution risk is greatly reduced.

2. The leachate guide and discharge pipeline arranged in the invention guides and discharges leachate by using gravity, thereby greatly reducing the operation energy consumption and being economical and feasible.

Drawings

Fig. 1 is a leachate guiding and draining plan layout diagram of an overhead rigid landfill leachate collecting-guiding and draining device in an embodiment of the invention.

Fig. 2 is a diagram of a leachate guiding and draining system of the overhead rigid landfill leachate collecting-guiding and draining device in an embodiment of the invention.

FIG. 3 is a cross-sectional view of a leachate leakage detecting pipe and a leachate drainage pipe of an overhead rigid landfill according to an embodiment of the present invention.

Fig. 4 is a partially enlarged view of fig. 3.

The figure includes: the leachate collection layer 1, the leachate impermeable layer 2, the leachate leakage detection pipe 3, the eyepiece 4, the leachate drainage vertical pipe 5, the waterproof casing 6, the leachate drainage horizontal pipe 7, the leachate collection pit 8 and the overhead layer 9.

Detailed Description

The invention is further described below with reference to specific embodiments.

Examples

The utility model provides an overhead type rigidity landfill leachate collects-drainage guide device, the device is including leachate collecting layer 1, leachate barrier layer 2, leachate leak hunting pipe 3 and leachate drainage guide pipe.

The leachate collection layer 1 (HDPE geotechnical composite drainage net or HDPE drainage plate) is laid on the upper layer of the rigid landfill reservoir, and the leachate impermeable layer 2 (2.0 mm HDPE geomembrane) is arranged on the lower layer. The leachate drainage guide pipe comprises a leachate drainage guide standpipe 5 and a leachate drainage guide transverse pipe 7, the leachate drainage guide standpipe 5 is located in the center of the rigid landfill unit, the upper part of the leachate drainage guide standpipe passes through 2.0mm of HDPE geomembrane and is subjected to hot melt welding, and the lower pipeline penetrates out of the pool bottom through a waterproof sleeve 6 embedded at the bottom of the rigid landfill pool. The horizontal leachate drainage guide pipe 7 and the vertical leachate drainage guide pipe 5 are welded through hot melting, and are drained to a leachate collection pit 8 near a rigid landfill site through gravity flow at a certain gradient.

The leachate leakage detection layer is located below the leachate impermeable layer, the leachate leakage detection pipe adopts a transparent ABS resin pipeline, the leachate leakage detection vertical pipeline penetrates out of the pool bottom through the embedded waterproof sleeve at the bottom of the landfill unit pool, and the tail end of the leachate leakage detection vertical pipeline is plugged by a blind plate so as to be convenient for visual detection. When the visual leachate exists in the leachate leakage detecting pipe of the landfill unit, the damage of the leachate impervious layer of the landfill unit can be shown, and the pipeline maintenance personnel of the landfill site can immediately carry out implementation remedial measures.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An overhead rigid landfill leachate collection-drainage device, characterized in that the device comprises:

2. The overhead rigid landfill leachate collection and drainage device of claim 1, wherein the leachate collection layer is HDPE geocomposite drainage network or HDPE drainage plate.

3. The overhead rigid landfill leachate collecting and draining device of claim 1, wherein the HDPE geomembrane has a thickness of 1.5 to 2.5 mm.

4. The overhead rigid landfill leachate collecting and draining device as claimed in claim 1, wherein the device further comprises a leachate check pipe located under the leachate impermeable layer and connected to the leachate collecting cross pipe.

5. The overhead rigid landfill leachate collecting and draining device of claim 4, wherein the leachate leakage detecting pipe is a transparent ABS resin pipeline, the end of the leachate leakage detecting pipe is blocked by a blind plate, and the elevation is lower than the leachate drainage guiding pipe so as to be convenient for visual detection, and when leachate exists in the pipeline, the landfill leachate is indicated to be damaged.

6. The overhead rigid landfill leachate collection and drainage guide device of claim 5, wherein a waterproof sleeve is embedded in the bottom plate of the rigid landfill, and the leachate collection standpipe passes through the waterproof sleeve.