Problem and solution of the occurrence of red colour in wastewater of seafood processing plant
1988
Phunsuk Prasertsan | Wanna Choorit (Prince of Songkla Univ., Songkla (Thailand). Faculty of Natural Resources. Dept. of Agro-Industry)
Red colour in wastewater of two seafood processing plants; Tropical Canning Co.,Ltd. and Songkla Canning Co.,Ltd. was found to be the photopigment of photosynthetic bacteria. The content of vitamin B12 in the bacterial cells growing in the sixth pond of Tropical Canning Co. was 1.124 microgram per gram of dry cells. Chemical oxygen demand (COD) in the last pond of Tropical Canning plant was reduced by 96 % compared to that of the first pond. Six different strains of purple sulfur photosynthetic bacteria were isolated from wastewater samples of these two plants and identified to be in the genus Chromatium and Family Chromatiaceae. Since oxygen has an inhibitory effect on the growth of photosynthetic bacteria under light condition, the increase of aeration rate in wastewater was suggested and found to be the effective solution to solve the problem of red colour in wastewater.
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