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This study evaluated a number of factors (including salinity, pH and temperature) affecting the growth of Halanaerobium lacruisei bacteria in order to reduce organic compounds (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 6 7 % salinity, pH 7.0 and 30 °C 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 could 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 to the inlet wastewater. The effluent after an effective treatment by this experimental method satisfied the requirements of type B wastewater standard specified in QCVN 40:2011/BTNMT. This study revealed that Halanaerobium lacruisei can be used effectively to treat the COD parameter in saline wastewater which can be applied in industrial wastewater treatment area as well.

STUDY ON DIFFERENT FACTORS AFFECT COD REMOVAL CAPACITY OF HALANAEROBIUM LACRUISEI IN SALINE WASTEWATER