Leachate Treatment in Place Final Disposal | Waste Solution

Read Also

Leachate Treatment in Place Final Disposal is as follows

Basic Coating (Liner)

In a good urban land, a basic coating system is usually required, aiming to reduce the leachate mobility into the groundwater. An effective liner will prevent the migration of contamination to the environment, especially into groundwater. But in fact not yet obtained a 100% effective liner system. Due to the inundation of leachate is inevitable, then in addition to the liner system required leach collection system. Therefore, the base of a closed field will consist of:

• Liner liner layers to prevent migration of contaminants outside the urban field
• Leachate collection system.
• Such coating systems may be natural materials (such as clay, bentonite) or synthetic. 

The use of liner material can be single or combination between the two known as geocomposite, depending on the required function. This formation of linings and types of liner material varies depending on solid waste disposal characteristics. For this type of municipal waste, Bagchi recommends simply applying a singled liner system with a liner type of clay material.

The recommended base coating is with geosynthetic or known as flexible membrane liner (FML). The geosynthetic types commonly used as base coatings are:

• Geotextile as a filter
• Geonet as a means of drainage
• Geomembrane and geocomposite as a barrier layer.
• Ledger Collector Channel

Commonly used leach collection systems are:

• Using a perforated pipe placed in the channel, then covered with rocks. This method is most widely used in landfills
• Make a channel then the channel is given a coating and inside it is arranged stone empty times.

Leachate collection facilities using pipes, in general, are as follows:

• Terrace slope

To prevent the accumulation of leachate at the base of an urge, the base of the closed is arranged into a certain slope of terraces (1-5%) so that the leachate will flow to the collecting channel (0.5-1%). To drain leachate into the treatment unit or recirculation each collecting channel is equipped with a hollow pipe. The slope and maximum length of the collecting channel are designed based on the capacity of the collecting channel facility. To estimate the capacity of collecting channel facilities, the Manning equation is used.

• Piped Bottom

The ground floor is divided into rectangles separated by clay separators. The width of the separator depends on the width of the cell. The leachate collection pipes are placed parallel to the length of the cell and placed directly on the geomembrane.

• Final Cover

Some of the functions of the end closing system are:

• Minimize the infiltration of rainwater into the pile of garbage after the urban land is finished
• Controlling gas emissions from the closed to the environment
• Controlling animals and disease vectors that can cause disease in ecosystems
• Reduce the risk of fire
• Provide suitable surfaces for various uses after the land has been completed, such as for recreational parks and others
• The main element in land reclamation
• Prevent erosion
• Improve the look of rural land in terms of aesthetics.

The final land cover system consists of several parts. The top is usually some soil that serves as a protective and supporting media plants (topsoil). If the land contained in the location does not meet the requirements then the required repairs. This repair is done by mixing or replacing the soil with soil from another location. This top layer soil thickness is 60 cm. The layer under the topsoil serves as a drainage system. This layer distributes as much of the incoming precipitation as it does not flow to the underlying layer. Commonly used materials are porous materials, such as sand, gravel, and synthetic materials, such as geonets. The thickness of this layer is about 30 cm.

Next is the retaining layer. The commonly used material is geocomposite (geomembrane and compacted clay). The recommended geomembrane thickness is greater than 2.5 mm, while for clay is greater than 50 cm.

Below the retaining layer, there is a layer of a gas ventilation system. This system is absolutely necessary for municipal waste because most of the waste is organic material that can be biologically described. Under aerobic conditions, the resulting gas is mostly carbon dioxide and methane; therefore u utilization of the biogas can be used as an alternative source of energy. The layer of gas ventilation system consists of porous media such as sand/gravel or in the form of the piping system. The bottom layer of the end closing system is the subgrade layer. This layer is needed to improve the stability of the land surface of the closed.

In addition, this coating helps form the desired slope to accelerate lateral drainage and reduce hydraulic height. The thickness of this layer is usually 30 cm. In addition to the final closure system, to reduce the runoff of water entering the closed, the slope is adjusted, also equipped with surface drainage and planting crops. 4) Leachate Processing In terms of components, the content of leachate is no different from domestic wastewater. 

However, the organic matter contained in leachate from domestic waste piles is very high concentration. This is shown from the very high levels of BOD5 in leachate which is about 2,000-30.000. Leachate treatment system is divided into two levels, namely secondary processing and tertiary processing. For secondary processing will be described a brief description of the stabilization pool units (facultative and anaerobic) and aeration ponds. The tertiary treatment will be described a brief description of land treatment and intermittent sand filter.

Tweet