Research

The sustainable recovery of phosphorus from wastewater streams and sewage sludge is a key component of modern wastewater treatment and circular economy practices. Phosphorus is an essential yet limited resource, and its recovery not only contributes to resource conservation but also reduces environmental impacts such as eutrophication. As part of this project, a feasibility study on phosphorus recovery at the Linz wastewater treatment plant is being conducted to evaluate the technical, economic, and ecological feasibility of suitable technologies. The analysis of the initial situation includes a detailed examination of the composition and properties of wastewater streams and sewage sludge based on data provided by Linz AG. Additionally, the existing infrastructure and current processes of the treatment plant are assessed to identify potential interfaces for the integration of recovery technologies. In the next step, various phosphorus recovery technologies are evaluated and compared in terms of their efficiency, costs, feasibility, and environmental compatibility. Publicly available data, as well as data provided by Linz AG, are utilized to ensure a realistic assessment of the costs and potential of the technologies. Based on the findings, an action plan will be developed, outlining scenarios for the implementation of suitable technologies. These scenarios take into account both technical and economic conditions and provide a decision-making basis for future implementation. The results of the study will be summarized in a detailed report, which will serve as the foundation for sustainable and resource-efficient phosphorus recovery at the Linz wastewater treatment plant. This project makes an important contribution to the circular economy and to meeting legal requirements for phosphorus recovery.

Development of a method for minimally invasive and millimetre-precise milling of tree pits (min. 1200 mm diameter) in existing asphalt and concrete surfaces using core drilling equipment, excavation of planting pits (min. 1500 mm deep) in different soil types, quick and easy temporary securing of planting pits, efficient and fast soil loosening. Development of a method for creating aeration holes (min. 100-160 mm diameter) including soil loosening (min. 1200 mm depth) and identification of suitable filling and sealing materials for the creation of surfaces that comply with ÖNORM B 1600. Development of a method for the minimally invasive creation of permanent and temporary irrigation solutions. Creation of microtrenching milling for the rapid laying of supply lines, identification of suitable irrigation controls, sensors and pipes. Development of a new, optimised and precisely fitting tree surround including root ball support that can be manufactured cost-effectively and in series. Development of a modular tree impact protection system. Development of a suitable biotech filter substrate that enables the discharge of surface water in accordance with ÖNORM B2506-3 despite low substrate volume and provides all necessary filter performance in the long term.

This project focuses on the development and testing of innovative films with a riplet surface, designed to be used in hydropower plants to enhance their efficiency. The aim is to evaluate the suitability of these films in preventing algae, fungi, and biofilm growth. The ISIG is responsible for establishing and conducting appropriate testing methods. A particular focus is placed on assessing the effects of antimicrobial particles embedded in the film structures on biofilm growth. Additionally, it will be examined whether undesirable substances are leached from the films or the adhesive used to attach the films. Finally, a practical test will be conducted in the inflow of a hydropower plant, where samples will be taken and analyzed to determine whether biofilm formation occurs.