Pollution Research Paper

Vol. 36, Issue 3, 2017; Page No.(462-473)

CHEMICAL OXYGEN DEMAND AND MICROBIAL INACTIVATION IN DAIRY WASTEWATER TREATMENT BY SOLAR PHOTOCATALYST PROCESS

MOJTABA AFSHARNIA, MOJTABA KIANMEHR, MOHAMMAD REZA NAROOIE, AND EHSAN ABOUEE MEHRIZI

Abstract

Contamination of the precious life sources from industrial waste including dairy wastewater is an increasing concern worldwide. The objective of this study was to examine the effect of concentrated/none-concentrated solar with/without TiO2 catalyst to optimization of the treatment of Chemical Oxygen Demand (COD) and microbial inactivation selected from a dairy wastewater treatment plant. In order to achieve optimal efficiency of the photo-degradation, the effects of different times (different light intensity) of solar exposure up to 240 min, as well as, photocatalyst loadings (TiO2 US-NANO) in the range from 0.25 to 1.0 g L-1 along with effluent characteristic changes, were evaluated. The higher COD removal efficiency using of concentrated solar process after 240 min was about 52%, and microbial inactivation efficiency only after 120 min reach to 100%. When the concentrated solar photocatalyst process was used almost reduced the total organic carbons (TOCs). The efficiency of COD removal and microbial inactivation by none-concentrated solar photocatalyst process was almost the same of efficiency of the concentrated solar process up to 60 min after it COD removal increased up to 170 min and then decreased at 240 min but microbial inactivation not satisfied. In treated effluent after 240 min, the scavenger concentration of CO3-2 and Cl- increase from 0 to 24 mg L-1 and of 212 to 383 mg L-1, respectively. In summary, the concentrated solar photocatalyst process indicated greater higher degradation, mineralization and bacterial inactivation than others, hence used of it for dairy wastewater treatment is convincing.

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