00000caa a22000003i 4500 UP-1685594773862408731 Buklod 20210408201310.0 m | | ta 210408s2020 xx r |||| u|eng d (iLib)UPBAG-00039679893 STII-DOST BAG rda eng ARTICLE-3056 Matanguihan, Anna Elaine D. author. Design, fabrication, and performance evaluation of open raceway ponds for the cultivation of Chlorella vulgaris Beijerinck in the Philippines by Anna Elaine D. Matanguihan, Rex B. Demafelis, Milagrosa Martinez-Goss, June Owen O. Nacorda, Nerissa K. Torreta, Denise Ester S. Sanchez, Lester F. Cuneta, Elton Mark P. Eleazar, and Lisa Stephanie H. Dizon. 2020. pages 379-388 color illustrations 26 cm text rdacontent unmediated rdamedia volume rdacarrier Includes bibliographical references (pages 387-388) Two pilot-scale open raceway pond systems were designed and fabricated in the University of the Philippines Los Baños (UPLB) for the cultivation of Chlorella vulgaris Beijerinck to observe the biomass productivity of the alga in an open condition in the Philippines. One design was an oval track with a middle island, while the other was a multi-stage raceway pond (MSRP) consisted of several sections separated by baffles. The pond designs aimed to accommodate 1,000 L of culture. The nutrient media used was composed of urea, NPK (16-20-0), FeCl3, and Na2EDTA ? a locally formulated medium that sustains the growth of the species. Paddlewheel was installed to provide mixing, which was turned on during the daytime, while aeration was continuously supplied through perforated air-distributor PVC pipes installed on the pond floor. Only natural light was utilized, and no lighting was provided during the night. The growth rate was generated by monitoring the biomass concentration in the pond through spectrophotometry at 425 nm, where optical density and biomass concentration relationship was initially established. Using the equation for first-order kinetics and taking the points from the exponential phase, the specific growth rate of Chlorella obtained from the oval raceway pond was computed to be 0.007308 h?1 with doubling time of 94.84 h. The biomass productivity rate was computed to be 308.49 g/m3-d or equivalent to 63.24 g/m2-d. On the other hand, the MSRP obtained a specific growth rate of 0.003389 h?1 with a doubling time of 204.55 h and equivalent biomass productivity of 302.19 g/m3-d or 60.44 g/m2-d. The biomass productivity obtained is comparable, even superior to other commercial open pond cultivation using C. vulgaris. (Author's abstract) Engineering. Biomass productivity. Costing. Doubling time. Multi-stage. Open raceway pond design. Specific growth rate. Dizon, Lisa Stephanie H. author. Eleazar, Elton Mark P. author. Cuneta, Lester F. author. Sanchez, Denise Ester S. author. Nacorda, June Owen O. author. Torreta, Nerissa K. author. Martinez-Goss, Milagrosa author. Demafelis, Rex B. author. The Philippine Journal of Science Vol. 149, no. 2, June 2020. Request full-text access via UPB University Library through https://forms.gle/KZjBv7aRtY6jiL5E9 (viewed 08 April 2021) FI UPBAG UPBAG-MAIN ARTICLE-3056 Analytics