Recent Reports
Biofilm systems
Failure of plastic media biofilters due to ponding  caused by the fungus
Subbaromyces splendens Hesseltine. Water Today, 1, (5), 86-90, (2010). Open
River Pollution
Acid mine drainage (AMD) causes different responses in riverine benthic macroinvertebrate communities than that caused by organic
pollution. The response is similar to that for metal toxicity and acidity where the impact is severe, or for inert solids where the impact
is moderate to mild. Biotic indices are based on saprobity and so do not accurately reflect community disturbance for either toxicity or
inert solids and thus cannot be considered as reliable indicators for AMD. The expected community response to both toxicity and inert
solids is best described simply in terms of suppression of both taxon richness (S) and abundance (n) regardless of saprobity. A
simple model (AMD
') is proposed that provides a precise and reliable metric of the effects of AMD in rivers.  

Gray, N.F. and Delaney, E. (2010)  Measuring community response of benthic macroinvertebrates in an erosional river impacted by acid mine drainage by
use of a simple model.
Ecological Indicators, 10, 668-675.
Replacement of chemical oxygen demand (COD) with total organic carbon (TOC) for monitoring wastewater treatment

Chemical oxygen demand (COD) is widely used for wastewater monitoring, design, modeling and plant operational analysis. However this method results in
the production of hazardous wastes including mercury and hexavalent chromium. The study examined the replacement of COD with total organic carbon (TOC)
for general performance monitoring by comparing their relationship with influent and effluent samples from eleven wastewater treatment plants. Biochemical
oxygen demand (BOD5) was also included in the comparison as a control. The results show significant linear relationships between TOC, COD and BOD5 in
settled (influent) domestic and municipal wastewaters, but only between COD and TOC in treated effluents. The study concludes that TOC can be reliably used
for the generic replacement of both COD (COD = 49.2 + 3.00*TOC) and BOD5 (BOD5 = 23.7 + 1.68*TOC) in influent wastewaters but only for COD (COD = 7.25
+ 2.99*TOC) in final effluents.

Dubber, D. and Gray, N.F. (2010) Replacement of chemical oxygen demand (COD) with total organic carbon (TOC) for monitoring wastewater treatment performance to minimize
disposal of toxic analytical waste.
J. Environ. Sci. Health, Part A., 45, 2213-2226.
 Water Technology Research Group
 Trinity College Dublin
 1980-2010 thirty years of research, training and consultancy