TAILIEUCHUNG - Báo cáo " Deodorization of food wastewater by using strong oxidants "

Wastewater from food processing enterprises is a strong organic-polluted wastewater. It contains mostly organic compounds, which fits to be treated by using biotechnology. The best technology for treatment is anaerobic. Deodorization is one of the most important points of this technology since anaerobic process generated some odor compounds. The main reason which causes bad smell in wastewater was a present of compounds which contains N and S. | VNU Journal of Science Natural Sciences and Technology 25 2009 30-34 Deodorization of food wastewater by using strong oxidants Le Duc Manh Food Industries Research Institute FIRI 301 Nguyen Trai Hanoi Vietnam Received 10 October 2008 Abstract. Wastewater from food processing enterprises is a strong organic-polluted wastewater. It contains mostly organic compounds which fits to be treated by using biotechnology. The best technology for treatment is anaerobic. Deodorization is one of the most important points of this technology since anaerobic process generated some odor compounds. The main reason which causes bad smell in wastewater was a present of compounds which contains N and S. In this paper we report the result of deodorization by using several oxidant agents. The deodorization was taken after anaerobic process. The result shown that at pH 4 gram l of CaO or 120 milligram l of CaOCl2 milligram l of KMnO4 or ml l of H2O2 can be useful separately. The recommendation is using of CaOCl2 for the best economic choice. Keywords Food processing wastewater wastewater treatment deodorization oxidant. 1. Introduction Wastewater from food processing enterprises contains large amount of organic compounds. With high BOD COD rate it is suitable for using biotechnology 1 2 . The best technology was demonstrated as anaerobic 12 . The influent was filtered by varied screens before pumping to UASB up-flow anaerobic sludge blanket system. The effluent was then drained off to deodorization treatment process. Most odors occurred in anaerobic process. Strongest odors of wastewater were derived from H2S SO2 benzyl mercaptan alpha-toluenthiol dimethyl sulfur DMS and ammonium NH3 . There are some methods were studied to deodorize wastewater such as liquid absorption solid adsorption using Tel. 84-4-38584481. E-mail thangcx@ microorganism and burning. 3-7 but the cost is their limitation. Oxidization of odors by using strong oxidants which contain oxygen chlorine

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