ABSTRACT
Neste trabalho foi mostrada a influência do tipo de material suporte: P4 (plástico reciclado rugoso, diâmetro médio de 2,31 mm, densidade de 900 kg.m-3, superfície específica potencial de 2.596 m².m-3sup) e P5 (polietileno, pouco rugoso, forma cilíndrica, diâmetro médio de 10 mm, densidade de 880 kg.m-3, superfície específica potencial de 3.075m².m-³sup) utilizados em dois reatores biológicos de leito móvel, fluxo contínuo, na remoção de carbono e nitrificação de esgoto sanitário, os quais foram divididos em duas fases, de acordo com a idade do lodo (IL): fase A: IL de 10 dias e fase B: IL de 3 dias. Foram aplicadas cargas orgânicas superficiais médias de 4,0 kgDQO.m-2.d-1 (P4) e de 4,1 kgDQO.m-2.d-1 (P5); e cargas superficiais de nitrogênio de 0,63 kgN.m-2.d-1 (P5) e de 0,66 kgN.m-2.d-1 (P5). Para o material P4, a remoção média foi de 87 por cento de carbono e 83 por cento de nitrogênio (fase A) e 80 por cento de carbono e 77 por cento de nitrogênio (fase B). Para o P5, remoção de 63 por cento de carbono e 55 por cento de nitrogênio (Fase A) e 59 por cento de carbono e de nitrogênio (fase B). Com base nos resultados obtidos, verificou-se que a remoção de carbono e nitrogênio não foi influenciada pela idade do lodo, mas pelo tipo de material suporte (forma ou características de superfície) e superfície disponível para o crescimento da biomassa.
This paper presented the influence of material support kind: P4 (rugous recycled plastic, medium diameter of 2.31 mm, density of 900 kg.m-3, specific surface potential of 2,596 m².m-3sup) and P5 (polietilene, cilindric shape, medium diameter of 10 mm, density of 880 kg.m-3, specific surface potential of 3,075m².m-3sup) used in two continuous flux biological moving bed reactors using different material support to remove nitrogen and carbon from sewage, which was divided in two phases according to sludge retention time (SRT): phase A: SRT of 10 days and phase B: SRT of 3 days. The organic loading rates applied were 4.0 kgCOD.m-2.d-1 (P4) and 4.1 kgCOD.m-2.d-1 (P5); and the nitrogen loading rates applied were 0.63 kgN.m-2.d-1 and 0.66 kgN.m-2.d-1 for P4 and P5, respectively. The support P4 achieved efficiencies of 87 percent for total carbon removal and 83 percent for nitrogen removal during phase A. These efficiencies slightly decreased to 80 and 77 percent for total carbon and nitrogen, respectively (phase B). The support P5 got removal efficiencies of 63 percent for total carbon and 55 percent for nitrogen (phase A) and 59 percent for total carbon and nitrogen (phase B). These results showed that the total carbon and nitrogen removal efficiencies were not affected by the SRT, but by the kind of support used (carrier geometry or surface characteristics) and available specific surface area for biomass growth.
ABSTRACT
This work investigated the nitrification in a hybrid moving bed pilot scale reactor, which used a low density recycled plastic support material for biomass growth. The filling rate was 20 percent of its working volume (22L). The feeding and recirculation outflow was 45L/day. The reactor operated at a temperature of 16°C, in two phases, according to the sludge retention time (SRT): A phase was 10 days and B phase was 3 days (average values). The applied average volumetric nitrogen and organic loads were 0.16KgTKN/m3.day and 1kgCOD/m³.day, respectively. The results showed an average nitrogen removal of 95 percent and average COD removal of 89 percent, in both A and B phases. Nitrogen removal rates were independents of the SRT.