Theme: Integrating Water and Resource Management
Results of applied science and innovations will be presented in this session, addressing the theme of integrating water and resource management with a focus pollution pressure and smart water allocation. There will be different forms of interaction with the audience.
Theme: Integrating Water and Resource Management
Results of applied science and innovations will be presented in this session, addressing the theme of integrating water and resource management with a focus pollution pressure and smart water allocation. There will be different forms of interaction with the audience.G104 -
The removal of medicines from wastewater is a topic of growing concern. This study investigates the removal of pharmaceuticals at the source as well as post-treatment using ozonation, a proven technique to remove pharmaceuticals. Pilot research was performed in the Netherlands to make the comparison between treatment at the source and of post-treatment. Most of the pharmaceuticals were effectively removed with an average removal of more than 80% at the pilot. The pharmaceutical removal averaged more than 90% for the full wastewater treatment including post-treatment with ozone. Possibilities to reduce the formation of bromate where investigated and finally, the comparison was made between the benefits and feasibility of treatment at the source or post-treatment for the removal of pharmaceuticals from wastewater.
The European water framework directive states: “Member States shall ensure the necessary protection … in order to reduce the level of purification treatment required in the production of drinking water.” This raises the question how to assess the water quality with respect to purification in a condensed manner. We developed a ‘Removal Requirement Index’ (RRI) that summarises water quality in terms of the need to remove substances or other measured parameters that overshoot the thresholds as laid out in the Dutch drinking water directive. The index represents removal needed for surface water to comply with these thresholds for drinking water production. The novelty of the index lies in the calculation of parameter overshoots in terms of percentages required removal, which provides natural coupling with actual removal efficiencies of drinking water treatment plants. In addition, the RRI considers the water quality as ‘moving target’ and does not limit itself to historically measured parameters only. We assess the RRI for a period for several locations along the river Rhine, the Netherlands. In addition, we discuss the position of the RRI to other existing Water Quality Indexes.
This study presents the results of an impact analysis of climate change on salinisation and the long-term availability of drinking water resources along the river Lek, a tidal branch of the Rhine delta. A 1D modelling approach was used that enabled studying 50 years of variation in discharge and tide in current and future climate (KNMI’14 Wh-dry scenario). It was found that freshwater intake locations along the Lek are increasingly vulnerable to salt intrusion, caused by the combination of sea level rise and decreasing river discharges due to climate change. It was also found that diverting a higher freshwater discharge to the Lek (20-40 m3/s) reduces the risk of salinisation at the upstream inlet locations. However, the increased influence of seawater intrusion on the freshwater inlets cannot be fully compensated for by this measure.
A new method -developed and validated as a result of the FP7 European project Aquavalens– has been implemented in Barcelona’s Water Supply Company and is being used to detect bacteria and viruses with a high sensibility, increasing the concentration volumes. It has become a powerful tool to manage microbiological risk assessment and monitor health-significant viruses in the DW System.
Results have been obtained for one year and a half and will be presented, comparing them with the ones obtained during the previous years.
This method, in the framework of risk assessment and the application the company’s Water Safety Plan, will increase the safety of the water supplied to consumers and the application of preventive measures, if necessary.
In non-chlorinated distribution systems microbial regrowth can be observed which is correlated with both temperature and biostability of the produced drinking water. In order to select the appropriate regrowth control measures, i.e. improvement of water quality or network cleaning, biofouling conditions in the infrastructure are assessed by sampling and analysing loose deposits and biofilms. Results reveal that the biostability of the drinking water is correlated with the biofouling and regrowth conditions in the mains. This supports further research on the efficacy of water quality improvement and network cleaning as possible control measure.
When targeting micro-pollutants in the urban water cycle different questions arise. A frequently asked and important question is which substance or substance group should be focused on. Secondly, various removal techniques are available. How do you know which one is right for the situation? Until now, a lot of people rely on measurement campaigns, while using models can save costs and can be a reliable alternative or complementary tool. Models can predict the removal mechanisms of certain micro-pollutants, but also the course of concentrations in surface water. A variety of future scenarios can also be tested. During our session we want to show what possibilities different models offer in making informed choices regarding monitoring emissions and removing micro-pollutants from the urban water cycle