Abstract:
Tofu and palm oil industries produce a lot of residual production of high organic
matter. With the addition of EM4, the residual production can be accelerated
decomposition into a nutrient-rich material so that it can be utilized for the growth of
Chlorella sp. This study aims to determine the benefits of fermented tofu industry
residuals and palm oil for the growth of Chlorella sp. on peat water media conducted
in March - October 2019 at the FPK Alga Research Center Laboratory of the University
of Riau. Samples of the remaining tofu industry production were taken in Pekanbaru
City and the Palm Oil Mill at PTPN V Tandun and peat water from the Kuala Terusan
River in Pelalawan Regency. The number of treatments in this study were seven
treatments consisting of P0 + (0% + 400 mL Dahril Solution 1), P0- (0%), P1 (40%), P2
(45%), P3 (50%), P4 (55 %), and P5 (60%), where the% value in each of these
treatments is the result of the fermentation of the remaining production of the two
industries in the operational volume of 3 L. Each treatment was added with 300 ml of
Chlorella sp. with a culture period of 14 days. The parameters measured were
abundance and biomass of algae, nitrates, phosphates, DO, CO2, chlorophyll-a, pH,
temperature. The results showed the best media at P3 (50%) with an initial
abundance of 785 x 106 cells / L to 12,812 x 109 cells / L and biomass 0.84 mg / L
on the 8th day. Nitrate concentration from 11.76 mg / L decreased to 0.11 mg / L,
phosphate from 39.82 mg / L to 0.43 mg / L. The DO value increased to 5.67 mg / L,
CO2 decreased to 3.35 and the pH increased to 7. It was concluded that the
fermented mixture of the remaining industrial production of tofu and palm oil could be
used as a nutrient for the growth of Chlorella sp.
