Waste Management – Leachate

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WATER TREATMENT FOR LANDFILL LEACHATE

Leachate is highly variable in terms of flow and quality. It contains different organic and inorganic elements that fluctuate seasonally and vary depending on the age and type of waste contained in the landfill. This can make effective and environmentally compliant leachate management and treatment difficult. Therefore each leachate must be evaluated independently andtreated depending on its unique characteristics to develop a safe and efficient solution.

Degremont Industry can carry out the initial leachate data analysis and use this to identify the most appropriate treatment technology for the site’s leachate. Through our proven step-by-step approach we can evaluate, identify, design, supply, install and commission the treatment plant from beginning to end. We can also evaluate existing leachate plants and provide operational and technical support to optimise the treatment systems and if appropriate complete any remediation work.

Many different processes may be applied to landfill Leachate treatment and will depend on various factors such as leachate quality and quantity, land availability, cost (both capital and operating costs), current or future legislation and the required discharge consent set by the local authority.

The first step in treating leachate is through upfront data analysis to identify what the leachate variables are particularly in relation to flow and quality. Appropriate knowledge and experience of leachate formation, hydrology and composition, and further leachate characterisations and monitoring is also essential. Once you have a clear understanding of your sites leachate then the most appropriate technology can be identified.

Our solutions for landfill leachate

Common practise is to treat the leachate using an on-site treatment plant or to tanker the leachate away for treatment at a remote site.

Biological treatment is the most commonly used process through anaerobic and/or aerobic treatment. This is where mirco-organisms digest the waste contaminates to produces a less harmful effluent with lower levels of BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand), suspended solids and ammonia. However, there are many other solutions available in the marketplace and these should be evaluated in line with the sites drivers and leachate criteria.

Once a leachate treatment plant has been fully installed it is important that this vital equipment is operated and maintained effectively to ensure it continues to operate under optimum conditions. Generally, this involves monitoring the process conditions such as COD, BOD, pH, flow rates and compliance checks with regular maintenance and calibration.

REFERENCES:

Waste landfill site, Engineering Project

At one of largest UK landfill sites, covering 380 acres and containing more than 18.5 million tonnes of waste, Degremont Industry identified, designed, supplied, installed and commissioned the most appropriate leachate treatment plant for the site. The 200m3/day treatment plant discharges to sewer and the main contaminant that it treats is ammonia whilst also reducing BOD and COD levels to meet the regulated discharge consent.