Water Works

Partcat PhD Student, Sina Moradi, reflects on his experiences while on sabbatical with SA Water for 13 months to work on different strategies to manage chloramine decay in water distribution systems.

One of the main goals of the water industry is to make sure that all customers can have access to safe potable waters that free of pathogens. To reduce the risk of hazardous pathogens to a minimum, disinfection treatment with e.g. free chlorine or chloramine is necessary. Maintaining an acceptable level of disinfectant residuals in water distribution systems has long been an international challenge for water utilities. Sina Moradi, a Ph.D. student

For this reason, Sina Moradi, a Ph.D. student from PartCat group was on sabbatical with a research team at SA Water (Adelaide) for 13 months to work on different strategies to manage chloramine decay in water distribution systems. As part of this collaboration project with Australian Water Quality Centre (SA Water), and Water Corporation (Western Australia) supported through an ARC Linkage Project, Sina proposed a mathematical model to enable the estimation of chloramine residual in full scale drinking water supplies. This was based on chemical and microbiological factors that affect chloramine decay rate and he tested the applicability of the model on several waters from different water treatment plants in Australia.

This modelling approach has the potential to be used by water treatment operators as a decision-making support tool in order to manage chloramine disinfection. The team developed a chloramine decay index derived from water quality parameters to be an indicator to track the occurrence of rapid chloramine decay. The results show that proposed index was significantly higher at locations where rapid chloramine decay occurred and therefore can be useful in determining location in the distribution systems that experienced rapid monochloramine decay.

I had opportunity to meet fantastic people in industry, and as a student meeting all these very nice knowledgeable people helped me to learn from them

Sina Moradi

From controlled laboratory experiments, the contributions of chemical and microbiological parameters that could be attributed to the higher chloramine decay index observed at the locations that experience rapid monochloramine decay were illustrated. These outcomes could lead to significant improvements in control and operation of disinfection dosing through responses to changing water quality.

Sina says, 'I had a chance to collaborate with the research team at SA Water and to work in the water treatment plant sites and laboratories which helped me to gain some valuable experiences during that time. I am very much thankful to Scientia Professor Rose Amal for giving me this opportunity to do part of my PhD directly with industry. I also would like to express my gratitude to the officers of SA Water and AWQC)who shared various scientific and engineering knowledge and industrial experiences during my replacement period. I had opportunity to meet fantastic people in industry, and as a student meeting all these very nice knowledgeable people helped me learn from them.”

The results have been published as two separate papers in J. Environ. Sci., 2017, 57 (DOI information: 10.1016/j.jes.2016.11.007 and 10.1016/j.jes.2017.01.010).”

 

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