The basic steps in designing SLFs are the following:
There are three major events in a conventional landfill operation which should be considered in site development planning- subsidence, gas generation, and leachate generation.
The other consideration in site development planning is the functionality of the landfill facility components such as the access gates, cells, internal road network for efficient flow of traffic within the facility, maintenance and operations buildings/equipment such as the guardhouse/weigh bridge, admin and maintenance building, utilities—water, electricity and communication, and the possible inclusions of SWM related facilities such as MRF with or without composting, and the THW facility. And majorly, the size requirement for the landfill area.
The permits required towards establishing SLFs are as follows
1. Letter of Endorsement
There are generally 3 phases of constructing a SLF Facility:
Phase 1: MOBILIZATION
Phase 2: CONSTRUCTION AND CONSTRUCTION SUPERVISION
Based on the site development plan, design specifications and approved timetable, the contractor will commence with the actual construction of the facility with the following proposed sequence:
Once the facility is completed, demobilization commences with the demolition of temporary structures and facilities. Clean-up of the site of any debris and proposer closure of temporary sanitary facilities and utilities like pit toilets and dug wells.
The following summarizes the operations of SLFs:
A. SLF Cell Operation
This should be monitored periodically to avoid ponding in some filled sections of the facility. Ponding will induce more rainfall infiltrating and percolating into the waste pile hence leachate generation is increased. Ponded sections could also become breeding places for pathogenic microorganisms. The softening of the cell section with ponded water could start the breaching of the compacted soil cover.
B. GROUNDWATER AND SURFACE WATER MONITORING
Monitoring of the quality of the groundwater from a monitoring well downstream should be dine on a quarterly basis while the treated leachate and the receiving body of water should be monitored for pH and TSS on a weekly basis. A combination of pH, TDS, and TSS electronic analyzer could be used for this activity
C. SLOPE STABILITY
The side slopes of the rising mound of covered waste in SLF should be monitored for stability. Any damage should be repaired immediately to reduce danger of collapse or severe erosion