Abstract:
Microalgae have a big role in handle of water pollution control that able cultured by
peat water media. Peat water has a low nutrient contain and should be riched by
organic alternative nutrient came from slaughterhouse and tofu liquid waste. The
liquid waste tofu industry is around 20 million m3/year while the slaughterhouse
contributes about 30,000-52,500 liters/day. These liquid wastes contain high organic
matter such as nitrate and phosphate and have not been utilized to the maximum
that can be used if released directly into water bodies. The purpose of this research
was to study the effect of tofu liquid mixture and slaughterhouse used as nutrients in
the growth of Chlorella sp. on peat water media. This research was conducted in May
2019 at the Greenhouse of the Faculty of Fisheries and Maritime Major, University of
Riau, that using 5 types of treatment with different levels of concentration. The
operational volume of each experimental unit was 3 liters which was then added by
Chlorella sp. a total of 75 ml (2.5%). The results of this research indicate the growth
and abundance of Chlorella sp. about 7,415 x 109 cells/l in the handling of P3 (60%)
and there was a decrease in the value of Nitrates from 0.342 mg/l to 0.110 mg/l and
Phosphate values from 27.356 mg/l to 17.511 mg/l. Similarly, other water quality
parameters such as dissolved oxygen with an increase from 3.50 to 4.10 mg/l,, pH
increased 8 and temperature according to the optimal limit of 33oC which indicates
good water quality. The Conclusions are tofu industry liquid waste and
slaughterhouse can be used as nutrients needed by Chlorella sp. in its growth and to
improve water quality for the better. Besides Chlorella sp. has a lot of potential and
benefits in daily life.
