EFFECT OF LIGHT-SOURCE ON THE MICROBIOLOGICAL DESULFURIZATION IN A PHOTOBIOREACTOR

Removal rates of a toxic pollutant-hydrogen sulfide were investigated using several light sources in photosynthetic desulfurization. An inca ndescent bulb has a broad spectrum starting from about 400 nm but emit s most of its light energy beyond 800 nm as heat. LED710 among those s ources saved energy considerably comparing with the incandescent light , but the scattering and absorption was a problem in light transmissio n within the deep region of a bioreactor due to its own weak light int ensity. Fluorescent light was inefficient in desulfurization in compar ison with light sources illuminating with wide wavelength range, becau se of the weak transmittance at the peak wavelength of 460 nm. A combi nation of LED710 and fluorescent lamp was estimated as an optimal ligh t source in this study.