Subscribe to our blog and we'll email you the new articles we publish.
Subscribe to the newsletter
Table of Contents
One of the most significant challenges in waste management is leaching: a natural process, but intensified by human activity, in which Water extracts contaminants from waste and transports them to soils and aquifers..
Understanding what leaching is, how and why it occurs, and the impact that this leached water has on the environment is essential for respond effectively with sustainable solutions.
En ZITHERAs specialists in water and waste treatment, we address this problem from infrastructure design to advanced treatment plants.
What is leaching?
La leaching is a physical-chemical process through which water, when infiltrating through waste or soil, dissolves and carries away various polluting substances, forming a highly charged liquid known as leachate.
This phenomenon occurs naturally in ecosystems, but it is seen intensified by human activityespecially in urban solid waste landfills, industrial facilities, mining or agricultural operations.
The term "leaching", in its technical definition, refers to that action of extracting soluble compounds by passing water through a solid mass.
In landfills, for example, rainwater that comes into contact with the waste carries away organic matter, heavy metals, salts, "ammoniacal nitrogen", hydrocarbons, pathogens and other substances, forming leachate.
This liquid mixture must be handled properly to avoid environmental contamination.
Nature of the process
The phenomenon of the leachates It can begin immediately from the moment waste starts to accumulate. Even in well-designed landfills, the passage of water through the waste generates leachate that must be collected, stored, and treated.
This process is dynamic, as the composition of the waste changes over time, directly affecting the pollutant load of the leachate.
In the early stages of a landfill (acid phase), volatile organic compounds and fatty acids predominate, while in later phases (methanogenic phase), the leachate may stabilize slightly, although it maintains high concentrations of salts, nitrogen, and metals.
Types of leaching according to origin
We can find leaching in different environments:
- Landfills: most common source of industrial and urban leachate, due to the heterogeneous mixture of waste.
- Agricultural areas: when fertilizers or pesticides are washed away by irrigation water or rain.
- mining operations: water can leach heavy metals or generate acid drainage.
- Contaminated industrial soils: where groundwater comes into contact with hazardous waste.
This phenomenon has led European and national legislation to establish strict regulations to prevent leaching from compromising surface or groundwater.
In fact, leaching is one of the most frequent causes of aquifer contamination and requires specific treatments to remove toxic compounds from the leachate.
Composition of the leachates
The composition of leachate may contain:
- Organic material: biodegradable compounds, derived from food waste, plant or animal.
- Heavy metals: lead, cadmium, mercury, zinc, among others.
- Dissolved salts: chlorides, sulfates, ammonium.
- Pathogens: bacteria, viruses, fungi.
- Emerging Contaminants: drugs, microplastics or industrial chemical compounds.
- Color and turbidity: visual indicators of the level of pollution.
The amount of leachate (the volume of solubilized compounds) varies depending on several factors: the composition of the waste, the volume of filtered water, the residence time, and the degree of compaction of the waste.
In technical applications, indicators such as the "amount of leachate per liter of water in the pool" are even used to simulate concentrations in specific treatment scenarios.
While leaching is an inevitable process, The key is controlled leachingmanaging both the production and treatment of leachate, as part of a comprehensive strategy to protect water and ensure the sustainability of industrial and urban activities.
From ZITHERThis vision leads us to develop solutions that combine technical efficiency and regulatory compliance in the treatment of leachate.
Impact on water and ecosystems
Leachate contains a high concentration of pollutants organic, inorganic, microbiological and emerging contaminants that, without proper management and treatment, can seriously alter water quality, ecosystem health and the safety of water resources used by humans.
Groundwater contamination
When the impermeable barriers of landfills are insufficient or fail, Leachate can seep into the subsoilcontaminating groundwater and aquifers used for human supply, agricultural irrigation or industrial processes.
Once introduced into the aquifer, the amount of leachate accumulated can persist for years or even decades, due to the low natural purification capacity of groundwater.
Alteration of surface waters
Leaching also It can reach rivers, streams, lagoons, or coastal areas. due to underground connections with waterways. The result is a rapid degradation of water quality, with the consequent loss of biodiversity and alteration of aquatic ecosystems.
Human health risks
People can see each other exposed by consuming contaminated water, through contact with altered soils or by inhalation of toxic vapors released from these liquids, causing gastrointestinal and hepatic disorders, neurological and renal conditions as well as respiratory problems.
Treatment and prevention: SITRA solutions
In SITRA, We address the problem of leaching from a comprehensive perspectiveWe not only treat leachate, but we also design customized systems for its prevention and control.
Our approach starts from a clear premise: leaching does not have to be synonymous with pollution if the necessary measures are in place. appropriate technologies and a efficient technical management.
Customized treatments for leachate
We have advanced treatment plants for the conditioning and purification of leachate. These types of solutions allow reduce the pollutant load of the leachateadapting it to the limits required by current regulations.
More information in ➡️ our industrial wastewater treatment service.
Recycling and reuse systems
Depending on the final quality of the treated water, our projects even allow for reuse of leachate in auxiliary or industrial cleaning processes, contributing to the circular economy and the reduction of clean water consumption.
Check out our solutions for ➡️ to recover and reuse water in various industrial processes.
Prevention at source and reduction of leaching
We design preventative strategies to reduce the amount of leachate generated, through efficient waste management, waterproofing of floors and roofs, and the use of spill minimization technologies.
More Information ➡️ Design and construction of a leachate treatment plant.
Comprehensive management and monitoring
In addition to the design and construction of the plants, SITRA offers a comprehensive service for operation, maintenance and remote controlThis allows for anticipating problems, ensuring environmental compliance, and optimizing operating costs.
➡️Discover our plant management outsourcing service.
Thanks to our Over 145 years of experience in industrial and municipal sectors, ZITHER We help our clients to transforming environmental challenges into sustainable opportunities, taking care of the water and the environment.
📞 Talk to our experts and discover how we can help you control your leachate, optimize processes and protect the environment without compromising operational efficiency.
