Technological solutions
BIODAPH reactor
The BIODAPH reactor was designed by performing a computational fluid dynamics analysis to optimize the critical parameters that enhance the efficiency of the technology in terms of the quality parameters required for the specified use of the reclaimed water at the two demo-sites.
BIODAPH reactor is composed of :
1.- The mixing chamber was designed to promote the sedimentation of the large suspended solid particles (sludge) present in the secondary effluent. The inlet ensures the aeration of the influent providing an appropriate concentration of dissolved oxygen.
2.- The main working body of the reactor has been designed to optimise the ecological status for the D. magna, enhancing its filtration capacity, and the development of biofilm on the surfaces of the reactor. The lamellas inside the reactor maximize the biofilm surface area for both Daphnia magna development and the reduction of nutrients.
3.- The outlet chamber designed to minimize preferential paths that could drag individuals of Daphnia magna out of the system and to allow reclaimed water to be discharged by overflow.
The main advantages of BIODAPH Technology are: its low capital investment and low operation costs ( e.g. low energy consumption, minimal maintenance, absence of chemicals, and the small sludge production). This alternative tertiary natural depuration system is able to provide reclaimed water that is of a high chemical and biological quality for agricultural irrigation and other non-potable uses.
Demo case (Girona, Catalonia, Spain)
The Spanish demo-site consists of two BIODAPH reactors installed in parallel with a nominal load of 100 m3/d each. The implementation of this system at Quart WWTP has reduced the impact of secondary wastewater discharges into the Onyar River while improving the chemical and ecological status of the river’s aquatic ecosystems, meeting the standards set out in Water Framework Directive of the EC (Directive 2000/60/EC).
The BIODAPH reactors currently treats up to 40% of the secondary wastewater, which was previously discharged directly. It can be presumed that future environmental controls will record a significant reduction in the discharge of pollutants into the aquatic environment of the Onyar river.
INPUTS AND OUTPUTS IN THE QUART DEMO-SITE
DEMO CASE (ANTISSA, GREECE)
In Greece, the BIODAPH technology is installed alongside the existing Antissa WWTP, which employs an activated sludge process to treat domestic sewage. In addition to the activated sludge process, Antissa WWTP features modular units of upflow anaerobic sludge blanket digestion (UASB), constructed wetlands (CWs) and UV disinfection put into operation as part of the HYDROUSA project. The modular configuration of this treatment process allows the BIODAPH reactor to be tested both after the UASB unit and after the CWs to obtain reclaimed water to irrigate 7000m2 of nearby agricultural land.
INPUTS AND OUTPUTS IN THE ANTISSA DEMO-SITE
Configuration 1
Configuration 2
