LAT Water Limited

Leachate Treatment

Some basic facts about Leachate:

Leachate - any liquid that in the course of passing through matter, extracts soluble or suspended solids, or any other component of the material through which is has passed.

Leachate from landfill varies widely in composition depending on the age of the landfill and the type of waste that it contains. It can usually contain both dissolved and suspended material. The generation of leachate is caused principally by precipitation percolating through waste deposited in a landfill. Once in contact with decomposing solid waste, the percolating water becomes contaminated, and if it then flows out of the waste material it is termed leachate. Additional leachate volume is produced during this decomposition of carbonaceous material producing a wide range of other materials including methane, carbon dioxide and a complex mixture of organic acids, aldehydes, alcohols and simple sugars.

The most common method of handling collected leachate is on-site treatment. When treating leachate on-site, the leachate is pumped from the sump into the treatment tanks. The leachate may then be mixed with chemical reagents to modify the pH and to coagulate and settle solids and to reduce the concentration of hazardous matter. Traditional treatment involves a modified form of activated sludge to substantially reduce the dissolved organic content. The treated liquor is rarely of sufficient quality to be released to the environment and may be tankered or piped to a local sewage treatment facility; the decision depends on the age of the landfill and on the limit of water quality that must be achieved after treatment. With high conductivity, leachate is hard to treat with biological treatment or chemical treatment.

There are over 3,000 landfill sites in the UK all of which have common problems of leachate treatment - treatment and disposal which is the largest cost of running the site.

Using the patented LAT Water innovative technology, costs of treatment are greatly reduced. LATW can offer the landfill operator the opportunity to make major cost savings. A further medium term benefit to the operator from the LAT Water process will arise from its efficient management of the leachate flows.