Respected Sir, Hope you will be fine. I am a university student in Turkey and doing MS Environmental Engineering. I am interested in designing and application of Concentrator Parabolic Panels as a reactor in waste water treatment. In this technology my basic purpose will be to use UV portion of sun light in degradation of water pollutants. I need your kind guidance in this project. Please guide me with what strategy I should precede and which areas are still needed to be studied, improved or discovered on which an academic research should be carried on.
Waiting for kind response..
Fatih University Istanbul Turkey.
Hello Muhammad and thank you for writing to me.
I had thought also about using UV in concentrated sunlight for such a purpose. I am interested in your ideas about this.
The big problem is that the UV required for germicidal irradiation is UV-C (100-290 nm). According to the US EPA:[UV-C is] completely absorbed by the ozone layer and atmosphere. This is a good thing for us humans. There is such a small amount that even when concentrated, it may not be effective. Even at the concentration of my parabolic trough solar concentrator (about 18:1), the heat produced from the rest of the spectrum might boil the water before any UV-C sterilizes the microorganisms?
The glass of the reactor must be of a type clear to UV-C (quartz glass).
The water to be treated must already be very clear since particulates shield the UV-C. The water must be filtered to a high level (reverse osmosis?) before irradiation.
A correct exposure time must be determined for the radiation to be effective.
Successful operation of the system needs a test that the organisms are sterile and cannot reproduce since the UV-C does not kill them. Looking with a microscope, they will still be moving.
Do you plan to build a model?
Would boiling or distilling the water with concentrated sunlight be a better project? There is much heat available this way which can effectively kill all organisms, even in sludge. The UV-C is difficult.