Amgen Cymru

Amgen Cymru
Amgen Cymru

Leachate Treatment

The company recently completed the construction of a biological leachate treatment plant at its Bryn Pica Landfill Site. The plant is an exciting technical project for Amgen Cymru and constitutes significant investment in site infrastructure.

The project has been undertaken in accordance with strict environmental guidelines specified by the Environment Agency.

Further information in relation to landfill leachate and it’s treatment can be found at – a web site hosted by Enviros Consulting Ltd., one of our partners in this project.

Leachate Treatment
View of Leachate treatment plant at Bryn Pica Landfill.

What is Leachate?

Leachate is contaminated ‘dirty’ water that is produced when rainwater comes into contact with waste materials on the area of the landfill. It contains a number of different contaminant, probably the most significant of which is ammonia. Ammonia is toxic to fish and other aquatic life and therefore it must therefore be strictly controlled.

How does it work?

The leachate treatment plant at Bryn Pica utilises a biological process to remove ammonia (along with other various contaminants) from the leachate. This is done in a large tank using a specific type of bacteria ‘bugs’. The treated effluent is then sent to the sewer network for disposal.

The treatment plant at Bryn Pica is capable of treating approximately 200 cubic meters of leachate per day.

Leachate Treatment
Bryn Pica Leachate Treatment Plant Process control software (SCADA).

For the Scientist:

The nitrification process:

Nitrification is the biological oxidation of ammoniacal nitrogen to nitrate nitrogen by autotrophic bacteria, which derive energy from the oxidation reaction, and utilize inorganic carbon as their principle food source.

The nitrification reaction is a two stage oxidation, each stage being performed by a distinct group of bacteria. The first stage, oxidation of ammoniacal nitrogen to nitrite nitrogen, is performed by bacteria of the genus Nitrosomonas. The second stage, where this nitrite nitrogen is further oxidised to nitrate nitrogen, is performed by species of Nitrobacter.

The reactions are shown empirically below:

1st stage: 55 NH4+ + 76 O2 + 5 CO2 ® 54 NO2- + 109 H+ + 52 H2O + C5H7O2N (a)
2nd stage: 115 NO2- + 52.5 O2 + 5 CO2 + NH4+ + H2O ® C5H7O2N + H+ +115 NO3 - (b)

Bryn Pica, Llwydcoed, Aberdare, Rhondda Cynon Taf, CF44 0BX
Tel: 01685 870770 - Thu 24 Jan 2019 08:14:20