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Evaluation of a System for Dairy Wastewater Treatment Composed by Photochemical (TiO2 fixed / UVsolar) and Biological (Aeration Pond) Reactors


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DOI: https://doi.org/10.15866/ireche.v5i4.6932

Abstract


The efficiency of a system composed with photochemical reactor based on Advanced Oxidation Process (AOP) followed by treatment in bioreactor was investigated as an alternative for treatment of dairy effluent in order to reduce the organic load. The influence of organic load in crude dairy effluent and pre-treated dairy wastewater were also investigated upon efficiency of biodegradation system based on Aerated Pond System (APS). The AOP was conducted using titanium dioxide (TiO2) as photocatalyst and solar irradiation. The catalytic bed was prepared by using TiO2, coating evenly with polyurethane, and fixing on a flat metal plate. Effluent was percolated and fixed at 23º angle of the North on a catalytic plate where it was irradiated for a three-hour period. The biodegradation tests were conducted during 72 hours. Chemical Oxygen Demand and Total Organic Carbon were employed to evaluate the total organic carbon reduction, respectively. Biodegradation of crude dairy effluent with an approximate COD value of 3,800 mg O2 L-1 presented around 26.01 ± 5.23% of carbon reduction. The AOP – APS system, which showed higher efficiency of organic load degradation, presented 93.70 ± 0.10% of total carbon reduction, characterized by a COD of entry into 3782.5 ± 37.6 mg O2 L-1 and a COD for the treated effluent output at 236.8 ± 0.1 mg O2 L-1. This data demonstrated the necessity of dairy wastewater pretreatment and the efficiency of pretreatment system based on TiO2/UVsolar.
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Keywords


AOP; Photocatalysis; TiO2; Dairy Wastewater

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References


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