Banca de DEFESA: IDAYANA DA COSTA MARINHO
Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.STUDENT : IDAYANA DA COSTA MARINHO
DATE: 30/12/2022
TIME: 09:00
LOCAL: Pos-graduação Engenharia Civil
TITLE:
Pilot-Scale High Rate Algal Ponds for Nutrient Removal from Municipal Wastewater: Production of Value-Added Compounds
KEY WORDS:
nutrients removal, pond depth, biodiesel, lipids, PUFA, omega 3
PAGES: 215
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:
This study evaluated the performance of a treatment system composed of three high rate algal ponds (HRAPs) of different depths (30, 50 and 70 cm) for nutrient removal and production of value-added compost (biomass, lipids, biodiesel, and PUFAs). Two operational phases were tested, in which both differed by the time of feeding the effluent, phase 1 (two feeds of 3 h) and phase 2 (eight feeds of 45 min). The HRAPs (HRAP30, HRAP50, and HRAP70) operated with the same hydraulic retention time - HRT (2 days) and UASB effluent as the inflow. The most satisfactory operational performance was found in phase 2 for HRAP30 and HRAP50, respectively. The mentioned average efficiencies refer both a higher removal of ammoniacal nitrogen (90 and 73 %) and orthophosphate (80%), and a high average production of biomass (300 and 600 g.m-2.d-1) and lipids (7.5 and 15 g.m-2.d-1), respectively. Higher FAME productivity was also reported at HRAP50 (0.8 g.m-2 d-1). On the other hand, the deepest LAT (LAT70) evidenced a higher mean lipid content during phase 2, in which, simultaneously, a decrease in chlorophyll production was observed. A variation in the phytoplankton community was identified for the all HRAPs as they transitioned from stage 1 to stage 2. This change was evidenced by the development and growth of cyanobacteria to the detriment of chlorophytes. In the operation of the HRAPs located in Recife (at low latitude, near the Equator), the use of a low HRT in HRAP70 (higher depth) helped the lipid content (50%) Value-added PUFAs, such as linoleic acids (C18: 2ω6), α-linolenic (C18:3ω3) and cis-4,7,10,13,16,19-docosahexanoic (DHA or C22:6 ω3) acids can be produced through HRAPs by varying the depth. Depths of 50 and 70 cm were more likely to stimulate the production of these FAMEs. Along with the choice of depth, a greater mass of the said acids is favored, when the HRAPs were fed in two 3 h cycles (phase 1).
COMMITTEE MEMBERS:
Presidente - 3133998 - BRUNA SCANDOLARA MAGNUS
Externa ao Programa - 1061125 - ELIZABETH AMARAL PASTICH GONCALVES - nullExterno ao Programa - 3141471 - FABRICIO MOTTERAN - nullExterno à Instituição - MIGUEL MANSUR AISSE - UFPR
Externa à Instituição - SHYRLANE TORRES SOARES VERAS - UFPE