Livestock-Based Farming Systems, Renewable Resources and the Environment
The research about utilization biodigester effluent to raising biomass of chlorella was conducted in the experimental farm of AnGiang University. This study finding out the amount of biodigester effluent which suitable for culturing Chlorella were arranged in a completed randomized design (CRD) with 5 treatments and 3 replicate. Individual treatments were be: 100% biodigester effluent, 75% biodigester effluent + 25% running water, 50% biodigester effluent + 50% running water, 25% biodigester effluent + 75% running water, and control treatment. Was used Wanle solution to raising algae. Protein level of biodigester effluent at the starting experiment was 20 mg/L. The experiment was carried out in colloidal glasses 15 litters which put in the house with tonle roof and were followed in during 8 days. The density of algae as well as environmental factors pH, temperature is monitored daily, while other factors such as TAN, NO2-, NO3-were measured 2 days / times.
The results showed that the highest density of algae was 1.107 ± 0.079 million cells / ml at the 6th day in treatment 25% of the biodigester effluent and this difference is significant compared to other treatments (p<0.05). In the control treatment Chlorella populations on day 5 were relatively high 1.028 ± 0.037 million cells / ml. However, the growth of algae peaked on day 3 of treatment using 25% of waste water biogas (0.53) and day 2 for the control treatment (0.72). These results also showed that in treatment using 25% of biodigester effluent had the highest density of algae and growth stability.
Key words: Algae, density of algae, growth of algae, biodigester effluent, chlorella