Research on the effect of palm oil mill effluent medium on Chroococcus dispersus growth had been done. The research was an experimental study with complete random design with 8 treatment (sediment and anaerob wastewater with concentration 25%, 50%, 75% and 100%). The growth curve was made based on the value of optical density (OD) measured at a wavelength of 680 nm. Chroococcus dispersus best growth seen at sediment wastewater medium with concentration of 100% and at anaerob wastewater medium with concentration of 75%.
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