Landfill Leachate Evaporation Systems - Leachate Wastewater Treatment
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What is Landfill Leachate?
Landfill leachate is the runoff water that occurs from operational or closed landfills. This water flows at lower rates on dry days when naturally occurring moisture percolates out and at higher rates on rainy days when the leachate waters are combined with stormwater. Municipal landfill leachate water is often characterized by four main groups of contaminants:
- Dissolved organic matter
- Inorganic macro components
- Heavy metals
- Xenobiotic organic compounds
Hazardous waste landfills are characterized by all of the above and potentially more including compounds regulated by the RCRA.Leachate characteristics are determined by the site, design, solid waste, mode of operation at the landfill, as well as the age of the landfill itself. Young landfills (<5 years) tend to have a lower pH as well as higher levels of COD, BOD and heavy metals. Ammonia and salinity can also be a factor no matter the age of the landfill.
Option 1: Evaporation Alone
Certain landfill leachate applications are at a volume and characteristic that make it feasible to evaporate to atmosphere a very high percentage of the overall volume. Since landfills often have a significant supply of naturally occurring gas; there is great potential to use this gas as a free energy source to evaporate the wastewater. ENCON offers thermal evaporators that can efficiently burn the off spec landfill gas at a rate that keeps up with the generation of landfill leachate wastewater. In addition, ENCON also offers thermal evaporators that use waste heat from landfill flares or exhaust from on-site power generation plants to evaporate the leachate
Option 2: Multiple Technology Solution Featuring Evaporation
Some landfill leachate applications are at a (higher) volume and characteristic that make it more sensible to use multiple technologies, including evaporation, to cost effectively treat these waters. In particular, a system might include treatment such as:
- Filtration
- Softening
- Ultra Filtration (UF) or Reverse Osmosis (RO)
- Evaporation
The reject waters from the UF or RO system go to the evaporator. In this case, the evaporator could be the previously mentioned ENCON Thermal Evaporator that is heated with free off-spec landfill gas/waste heat or an ENCON MVR Evaporator with two stages of heat recovery that evaporates and recovers water as distilled water with minimal energy requirements.
Download a PDF copy of this article here: Landfill Leachate
PUT OUR ENGINEERING AND REGULATORY EXPERTISE TO WORK FOR YOU
ENCON Evaporators provides the following services relative to evaporation/distillation projects:
• FREE wastewater qualification analysis to ensure application feasibility
• Regulatory compliance and paperwork
• System design and compliance for hazardous waste applications
• PLC programming to optimize system automation
• Closed loop recycling evaluation and analysis