Water Journal : Current May 2016
administrative (OMA) costs in the different STPs. Out of 10 water quality monitoring of local councils STPs datasets, submitted by the participating municipal councils, four constituting a representative sample of these STPs were analysed, comparing nitrogen and phosphorus concentrations before and after. The upgrades had no significant effect on nitrogen concentration. Phosphorus concentration was significantly reduced in three of the four plants after the upgrade. A cost curve was constructed comparing OMA costs with plant capacity equivalent population (EP). Scale economy was found, as OMA cost tends to reduce for every additional unit of plant capacity. Submitted datasets were found to be incomplete in most cases. Even though a successful monitoring program depends on good quality datasets, these were of poor quality, with no consistency in monitoring time periodicity, lack of monitoring sites spatial descriptions, and no weather variability annotations. These problems may account for much of the variation seen in the statistical analysis performed in this study, suggesting that although some changes might be achieved with the implementation of new technology, they may be hidden behind a layer of 'noise , and so remain unseen. A standardised monitoring methodology would guarantee that all STPs follow the same quality guidelines, provide researchers with standardised data to perform studies and accurately cross sectional issues. Manuel Lequerica is an MSc Candidate at University of Sydney Integrative Ecology Lab. Rod McInnes is an Economics Consultant with WaterNSW. This paper is being presented at Ozwater'16 in Melbourne, May 10--12. To read the full article, visit the Water e-Journal at bit.ly/e-Journal Nitrogen and phosphorus can be removed from wastewater by means of chemical, physical or biological treatments, but treatment plants with modern nutrient removal technologies are expensive.
Current Feb 2016
Current August 2016