Name: Rodrigo Nunes Oss
Type: PhD thesis
Publication date: 12/07/2019

Namesort descending Role
Sérvio Túlio Alves Cassini Advisor *

Examining board:

Namesort descending Role
Alice Costa Kiperstok External Examiner *
Edumar Ramos Cabral Coelho Internal Examiner *
Jairo Pinto de Oliveira Internal Examiner *
Miguel Ângelo Schettino Junior Co advisor *
Ricardo Franci Gonçalves Co advisor *
Sérvio Túlio Alves Cassini Advisor *

Summary: Considering the water resources pollution, the water and energy scarcity, it is
necessary to develop sustainable Technologies based on NEXUS concept. The aim of
this research was to evaluate the ideal condition for the post-treatment of an UASB
reactor, treating domestic wastewater, and production of microalgae biomass in High
Rate Algal Ponds (HRAP) to generate activated carbon. This study was divided into
three papers. In the first paper, the influence of the depth (30, 45 and 60 cm) and the
hidraulic retention time (3 and 6 days) of the HRAP for the post-treatment of an UASB
reactor, treating domestic wastewater, and production of microalgae biomass. The
injection of biogas for supplementation of inorganic carbon in HRAP was also
evaluated. The findings of this study showed that the efficieny of the post-treatment of
an UASB efluente was satisfatory, achieving a reduction of 67% for COD, 49% for total
phosphorous (P), 83% of total Kjeldhal nitrogen (TKN), 87% of ammoniacal nitrogen
and 99.8% of E. coli. The microalgae biomass production was highest for the lower
retention time. The supplementation of low concentration of CO2 increased the
productivity (32%) with regards to volatile suspended solids. The second paper
investigated the influence of temperature and the ratio between the mass of water and
the mass of sample during the carbonization and activation of raw microalgae biomass
as well as microalgae biomass with the addtion of tanfloc. Activated carbon was
prepared at 650ºC and 800ºC, using diferente proportion of water. Although a higher
amount of activated carbon was produced at 650ºC (41% more), the largest specific
surface area (SSA) was 177±19 m²/g, WHEREas the activated carbono prepared at
800ºC presented an SSA of 630±18 m²/g. In the last paper, two of the activaded
carbon, previously produced (BM and BMT), was tested to adsorb 2,4-D herbicide at
six different concentration (5, 10, 25, 50, 100, 150 mg/L). The AC of BMT presented
higher removal of 2,4-D, achieving 100% for the concentrations of 5, 10 and 25 mg/L.
The Langmuir isotherm model was the one that best fitted to the experimental data,
presenting R2 of 0,998. The pseudo second order kinetics presented good fit for both
samples of activated carbon

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