Photo- and electrochemical environmental technologies

Nano structured super-hydrophobic coatings for the self-cleaning of surfaces.
© Fraunhofer IST, Rainer Meier, BFF Wittmar
Nano structured super-hydrophobic coatings for the self-cleaning of surfaces.

Sustainable technologies for a clean environment

Photo- and electrochemical oxidation processes are used to break down organic substances and contribute to the environmentally friendly production of hydrogen and the conversion of carbon dioxide (CO2) into higher-value hydrocarbons. At the Fraunhofer IST, the preferred methods are electrochemical oxidation using diamond electrodes (EAOP®) and photochemical oxidation and reduction with photocatalysis. Neither of the two processes uses any additional chemical substances and they are therefore among the most environmentally friendly and sustainable technologies.

 

System solutions for the reduction of emissions and pollutants

We develop and test system solutions for the sustainable and efficient purification and disinfection of water, air and soil as well as for the synthesis of basic chemicals. We are one of the pioneers of EAOP® technology as well as being a major player in photocatalytic metrology, scaling and standardization, and our customers therefore benefit from the flexible networking of our competences for the production, evaluation and adaptation of diamond electrodes and photocatalytic surfaces taking into account the limitations of economic efficiency and environmental sustainability.

Selected reference projects

 

Reference project

Decentralized medical care

 

Reference project

Drinking-water treatment using diamond electrodes

 

Reference project

Energy efficient and sustainable water-supply technologies for Africa

We offer solutions for your applications

 

Expertise

Diamond electrodes for water purification and disinfection

 

Industry solutions

Environmental technology

 

Kompetenz

Photocatalytic measurement technology

 

Expertise

Hydrogen and fuel cell systems

Further information

 

From research

Model calculations for the decomposition of nitrogen oxides by means of photocatalysis

DiaZon plant for the production of ozonized water

Ozonized water is produced in an electrochemical process and made available for various applications. In this process, ozone, a strong oxidant, is generated extremely energy-efficiently from the water molecules using diamond electrodes directly in the water. It can be used to reduce fouling on RO membranes and to prevent biofilms in ultrapure water or cooling systems. Alternatively, the system can be used to kill viruses, germs and pests, for example to disinfect surfaces or to improve plant growth.

DiaDis diamond-electrode demonstrator for on-site ozonized water production.
© Fraunhofer IST, Falko Oldenburg
DiaDis diamond-electrode demonstrator for on-site ozonized water production.

Specifications / technical data

  • Medium: deionized water with a conductance < 1µS/cm
  • Usable volume: 10 - 100 liters (variable)
  • Active substance: ozone (O3) dissolved in deionized water
  • O3 concentration: up to 10 mg/l
  • Ozone output: 200-250 mg/h dissolved O3 at 20°C
  • Dimensions: 1500 x 750 x 1950 mm (W x D x H)
  • Weight: 280 kg (empty), 400 kg (operation)

-> Reference project  “ICON-WASTEC“

Standard-compliant measuring station for photocatalytic air purification

The measuring station allows the evaluation of the performance of photocatalytic air-purifying surfaces in accordance with ISO 22197-1 to -4, EN 16980-1, DIN 19279 as well as pursuant to the guidelines of the German Federation for applied Photocatalysis (FAP). In addition to development-supporting order analytics, the Fraunhofer IST offers its customers a turnkey solution for determining the photocatalytic activity of their products and for demonstrating the sustainable and safe reduction of environmentally hazardous and toxic pollutants in indoor and outdoor areas.

Determination of the air-purifying effect of photocatalytic surfaces at the NO measuring station.
© Ronald Frommann / Fraunhofer IST
Determination of the air-purifying effect of photocatalytic surfaces at the NO measuring station.

Specifications / technical data

  • Applicable test standards: ISO 22197-1 to -4, EN 19680-1, DIN 19279
  • Possible test gases: NO, NO2, (O3), HCHO, C2H4O, C7H8
  • Reactors: directional flow flat-bed reactor, continuous stirred tank reactor
  • Dimensions: 900 x 900 x 2700 mm (W x D x H)

Photocatalytic air purification

Mobile backpack sprayer for the disinfection of surfaces

Among the commonly used disinfectants, ozone in dissolved form in water allows safe application, particularly for indoor use. However, ozone dissolved in water quickly decomposes and requires immediate production on site. As a self-sufficient system, the mobile backpack sprayer developed at the IST enables the production of a disinfectant agent without the use of additional chemicals. Through the integration of diamond electrodes, the ozone is generated quickly and efficiently directly in the water and can thus ensure the sustainable disinfection of surfaces.

Mobile backpack sprayer for the efficient production of ozonized water for surface disinfection.
© Fraunhofer IST, Falko Oldenburg
Mobile backpack sprayer for the efficient production of ozonized water for surface disinfection.

Specifications / technical data

  • Backbone: REB 15 PC3, Birchmeier Sprühtechnik AG
  • Medium: city water (via ion exchanger); deionized water with conductance < 5 µS/cm
  • Usable volume: up to 15 l; approx. 2 l/h
  • Active substance: Ozone (O3) dissolved in deionized water
  • O3 concentration: up to 1 mg/l dissolved O3 at 20°C
  • Weight: 5 kg (empty), 28 kg (operation)

Reference project “Demo-medVer“