Pharmaceuticals and personal care products (PPCPs) carried in biosolids (i.e., treated sewage sludge) may reach surface waters or groundwater when these materials are applied as fertilizer to agricultural land.
During the high flow conditions created by land application of liquid municipal biosolids (LMB) the residence time of solutes in soil macropores may be too short for sorption equilibration which increases the risk for leaching. Physically based solute transport simulation models are widely used in environmental risk assessment for pesticides.
These models may also be applicable for PPCPs when their physical and chemical properties and soil dissipation characteristics are available. However, these models do not account for non-equilibrium sorption in soil macropores. The model MACRO is one of the models used in environmental risk assessments for pesticides and may have potential as an environmental risk assessment tool for PPCPs.
A group of scientists from the Swedish University of Agricultural Sciences, the Swiss Federal Institute for Aquatic Science and Technology, Agriculture and Agri-food Canada, and Trent University, Canada, evaluated the MACRO model and an updated version of MACRO which included non-equilibrium sorption in macropores using data from experiments on the transport of three PPCPs (atenolol, carbamazepine, and triclosan), the nicotine metabolite cotinine, and the strongly sorbing dye rhodamine WT applied in LMB. The study was financed by grants from the European Union (ERAPharm, project no. 511135) as well as Health Canada, the AAFC GAPs program, and the Ontario Ministry of Agriculture and Rural Affairs, Nutrient Management Joint Research Program. Results from the study were published in the May-June issue of the Journal of Environmental Quality.
Results showed that the MACRO model could not reproduce the measured rhodamine WT concentrations in drain discharge. The updated version resulted in better fits to measured data for both PPCP and rhodamine WT concentrations. However, it was not possible to simulate all compounds using the same set of hydraulic parameters, which indicates that the model does not fully account for all relevant processes.
Mats Larsbo, one of the authors of the article, stated that “Our results show that non-equilibrium sorption in macropores has a large impact on simulated solute transport for reactive compounds contained in LMB. This process should be considered in solute transport models that are used for environmental risk assessments for such compounds”.
The identification of key model processes, such as non-equilibrium sorption in macropores, is an important step in the development of better tools for environmental risk assessment for PPCPs. However, further field studies and model evaluations are needed to establish under which conditions this process plays an important role.
The full article is available for no charge for 30 days following the date of this summary. View the abstract at http://jeq.scijournals.org/cgi/content/abstract/38/3/1274.
The Journal of Environmental Quality, http://jeq.scijournals.org is a peer-reviewed, international journal of environmental quality in natural and agricultural ecosystems published six times a year by the American Society of Agronomy (ASA), Crop Science Society of America (CSSA), and the Soil Science Society of America (SSSA). The Journal of Environmental Quality covers various aspects of anthropogenic impacts on the environment, including terrestrial, atmospheric, and aquatic systems.
The American Society of Agronomy (ASA) www.agronomy.org, is a scientific society helping its 8,000+ members advance the disciplines and practices of agronomy by supporting professional growth and science policy initiatives, and by providing quality, research-based publications and a variety of member services.
Sara Uttech | Newswise Science News
Further reports about: > Agronomy > Atenolol > Biosolids > Groundwater > MACRO > PPCP > Science TV > Triclosan > agriculture > carbamazepine > environmental risk > environmental risk assessment > nicotine metabolite cotinine > pesticides > soil dissipation > soil macropores > surface waters > transport simulation
Machine learning helps predict worldwide plant-conservation priorities
04.12.2018 | Ohio State University
From the Arctic to the tropics: researchers present a unique database on Earth’s vegetation
20.11.2018 | Martin-Luther-Universität Halle-Wittenberg
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
A research team from the University of Zurich has developed a new drone that can retract its propeller arms in flight and make itself small to fit through narrow gaps and holes. This is particularly useful when searching for victims of natural disasters.
Inspecting a damaged building after an earthquake or during a fire is exactly the kind of job that human rescuers would like drones to do for them. A flying...
Over the last decade, there has been much excitement about the discovery, recognised by the Nobel Prize in Physics only two years ago, that there are two types...
What if a sensor sensing a thing could be part of the thing itself? Rice University engineers believe they have a two-dimensional solution to do just that.
Rice engineers led by materials scientists Pulickel Ajayan and Jun Lou have developed a method to make atom-flat sensors that seamlessly integrate with devices...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
13.12.2018 | Awards Funding
13.12.2018 | Earth Sciences
13.12.2018 | Materials Sciences