Abstract
This study evaluated a number of factors (including temperature, pH, salinity) affecting the growth of Halanaerobium lacruisei bacteria in order to reduce COD concentration in saline wastewater of a fish sauce processing plant. The results of the study showed that halophillic bacteria had good capacity of reducing COD concentration under specific conditions.Laboratory experiments with different bacterial culture conditions showed that 30°C, pH 7.0 and 6-7 % salinity is the optimal culturing condition for Halanaerobium lacruisei treating COD in wastewater. In the laboratory condition, COD treatment capacity in saline wastewater of this microorganism can be up to nearly 88% after 48 hours, ensuring that the effluent meets the environmental requirements. In pilot condition of culturing the bacteria (in plastic tank, stimulating the real condition), after 25 days, the COD removal decreased continously, 80% effectively compared with the inlet wastewater. The effluent treatment efficiency by a laboratory method meets the standard of type B wastewater specified in QCVN 40:2011/BTNMT. This study showed that Halanaerobium lacruisei can be usedeffectively to treat the COD parameter in saline wastewater which can be applied in industrial wastewater treatment area as well.
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