Oh dear, what an odour…..
A landfill site in South Wales received industrial waste containing sulphurous compounds which gave off a pungent aroma, much to the delight of local residents. Carmarthenshire County Council sniffed out a solution.
Nantycaws landfill site located near Carmarthen, has been developed as a disposal
facility for domestic, industrial and commercial wastes arising within Carmarthenshire
and neighbouring counties.
The Environment Agency received the first complaints from local residents relating
to odours in the vicinity of the site in July 1998, some time after the first
inputs of sulphate waste. Potential sources of odours identified by the Agency
(i) hydrogen sulphide gas emissions due to the breakdown of the sulphate waste,
(ii) odours from accelerated waste degradation due to elevated rainfall and
(iii) landfill gas emissions from cells,
(iv) odours due to leachate storage.
The number of complaints increased during November and December 1998, and the
Agency instructed CWM Environmental Ltd, a company wholly owned by Carmarthenshire
County Council, to take immediate action.
In December 1998, CWM Environmental Ltd implemented a series of measures to
reduce the potential for odours. These include reduced re-circulation and increased
off-site disposal of leachate, reduced working faces, extra cover materials
for wastes, wells for landfill gas extraction and the installation of a landfill
However, even with these measures, odours might still arise from the leachate
and working faces, and CWM Environmental Ltd needed a liquid product that could
be applied directly to the source of the odour.
In the autumn of 1999, following consultation with Eco Technology Ltd and laboratory
based trials, CWM Environmental decided on a product called Super F SFA PLus
The SFA Plus LCH was applied directly to the large 640,000 litre leachate lagoon
next to the landfill. Dispersion was encouraged through use of a bowser and
pumping equipment to agitate and blow air through the lagoon.
A volume of treated leachate was then taken by bowser to the working face of
the landfill and sprayed directly on to the waste and the surrounding perimeter.
In hot weather conditions, the internal working roads are also treated to counter
The SFA Plus LCH was used in three applications; neutralisation of odours in
landfill leachate, on the working face, and internal site use. The product worked
by reacting on a molecular level to bind and neutralise the odourous compounds
in both liquid and air.
The Agency have not pursued CWM Environmental Ltd again since these measures
were taken, and there has been no further action or complaints regarding malodours
Simone Astins of the Environment Agency commented, ” CWM has conducted
trials with the use of a chemical (Super F) to reduce odours from the leachate.
These trials have proved successful and the product is now being utilised for
larger scale leachate treatment on site.”
Landfill manager, Mike Lewis, was impressed by the product and describes it
as “excellent ……highly effective……we will certainly purchase Super
F again in the future.”
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