http://repositorio.ufc.br/handle/riufc/495 Sun, 05 Apr 2026 02:45:55 GMT 2026-04-05T02:45:55Z http://repositorio.ufc.br/handle/riufc/67790 Título: Estudo do ciclo do nitrogênio em lagoas de estabilização tratando esgotos domésticos no Nordeste do Basil Autor(es): Silva, Fernando José Araújo da Abstract: The behaviour of nitrogen compounds was investigated in two pilot-scale pond systems (Systems XVI and XVII) treating domestic sewage from Campina Grande, Paraíba, northeast Brazil (7° 13' 11'' S, 35° 52' 31'' W, 550 above mean sea level). System XVI comprised two parallel anaerobic ponds (A9 and A10), followed by five parallel secondary facultative ponds (F21 to F25), one primary maturation pond (M15), five parallel secondary maturation ponds (M16 to M20) and four parallel tertiary maturation ponds (M21 to M24). These ponds have different depths and hydraulic retention times were arranged to form series with different configurations. System XVII was a long series of 1.5 m deep pond being the anaerobic pond (A11) fed with raw sewage followed by a secondary facultative pong (F26) and eight maturation ponds (M25 to M32). The systems of the experimental complex were investigated between June and December 1992. Monitoring was based on column samples (System XVI) and on both grab and column samples (System XVII). Pond samples (column and effluent0 and raw sewage daily composite samples were analysed for the following parameters: Total Kjeldahl Nitrogen, Ammonia, Organic Nitrogen, Nitrate, Nitrite, Temperature, pH, Dissolved Oxygen, Biochemical Oxygen Demand, Suspended Solids and Chlorophyll "a". Results showed that nitrogen occurred mainly by ammonia stripping in maturation ponds due high pH values in these ponds. System XVI attained an efficiency of 90% in ammonia removal, where System XVII reached efficiencies of 77 and 71% for effluent and column samples, respectively. Organic nitrogen was removed in the anaerobic ponds (round 50%). The organic nitrogen concentration in the final effluent of System XVI was about 10 mg N/l. By contrast, the concentration in System XVII was found to be about half (5 mg N/l) the concentration in the long series. Both systems showed low concentrations of nitrite and nitrate. Being higher in System XVII than in System XVI. Tipo: Dissertação Sat, 01 Jan 1994 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/67790 1994-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/67563 Título: Influência da composição do lodo ativado sobre a sua estabilização em digestores anaeróbios convencionais de mistura completa Autor(es): Araujo, Luiz de Souza Abstract: In this thesis, an experimental investigation is described which objective was to evaluate the influence of the composition of activated sludge an stabilization by anaerobic digestion. For this five sludges were generated from domestic sewage, with active (life bacterial mass) fraction ranging from 15 to 72 per cent of the volatile solids concentration. These sludges were digested in conventional anaerobic digestors at room temperatures of (25 ± 3) °C and a retention time of 20 days. During the which investigation the digestors functioned efficiently without any need of additon of corrective chemicals. It was noted thet the composition of the sludge to be digested influenced markedly upom the quantity of methan generated per unit mass of organic sludge and increased as the active fraction increased. Similarly the solids decay is influenced: the larger the solds decay. It was also observed that the alkalinity general in the digestor corresponded to the mineralization of amonia. Tipo: Dissertação Mon, 01 Jan 1990 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/67563 1990-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/19199 Título: Efeito da adição de lodo ao inóculo de reator anaeróbio híbrido sólido-líquido tratando fração orgânica de resíduos sólidos urbanos Autor(es): Carneiro, Pedro Henrique Abstract: Treatment of organic solid wastes like wastewater treatment plant sludges and organic fraction of municipal solid wastes are current issues in environmental engineering. Biological processes are more appropriate to treat these wastes. Recent trends like Kyoto protocol and clean development mechanisms (CDM) are improving anaerobic digestion of organic solid wastes. It was investigated the effect of adding anaerobic sludge to bioreactor landfill leachate applied like seed in hybrid anaerobic solid-liquid bioreactor treating organic fraction of municipal solid wastes. It was verified that sludge addition improved anaerobic digestion, accelerating volatile fatty acids degradation, anticipating biogas generation, increasing methane percentile composition and promoting more variability and presence of microorganisms. Sludge addition also increased total solids and total volatile solids conversion. Descrição: CARNEIRO, P. H. Efeito da adição de lodo ao inóculo de reator anaeróbio híbrido sólido-líquido tratando fração orgânica de resíduos sólidos urbanos. 2005. 115 f. Dissertação (Mestrado em Engenharia Civil: Hidráulica e Saneamento) – Escola de Engenharia de São Carlos, Universidade de São Paulo, São Paulo, 2005. Tipo: Dissertação Sat, 01 Jan 2005 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/19199 2005-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/19198 Título: Reator híbrido associando reator UASB e reator radial de leito fixo (RRLF), em escala piloto, no tratamento de esgoto sanitário Autor(es): Lopes, Alexandre Colzi Abstract: Integrated anaerobic/aerobic systems have been considered feasible alternatives concerning technical and economic aspects for treating domestic wastewaters. This paper presents the results obtained from the operation of this new reactor configuration, made up of a central unit – an upflow anaerobic sludge blanket reactor (UASB), with a working volume of 286 L, associated to a radial-flow aerobic immobilized- biomass (RAIB), with a working volume of 215 L. The RAIB reactor circles the solid/liquid/gas separation zone. The main modification in the UASB reactor concerns this association with the RAIB. The UASB effluent was distributed through openings along its side walls to the RAIB, allowing the elimination of collecting channels and feeding devices from the latter reactor. The objective of this work was to promote organic matter (raw and soluble) and nitrogen removal from domestic sewage. Organic matter (as COD) and volatile suspended solids removal achieved efficiencies of 80 % and 89 %, respectively. Under stable operational conditions, the system effluent presented COD and volatile suspended solids values of 110 mg·L-1 and 16 mg·L-1, respectively. Efficiencies of 90 % for COD and volatile suspended solids removal were achieved with a organic loading rate of 4,0 kg COD·m-3·d-1. This integrated system has shown to be a valid configuration, efficiently removing organic matter and suspended solids from the domestic wastewater. However, contrarily to expectations based on the previous studies with RAIB, nitrification was poor. Therefore, modifications to the RAIB design must be considered for the establishment of nitrogen removing processes. Descrição: LOPES, A. C. Reator híbrido associando reator UASB e reator radial de leito fixo (RRLF), em escala piloto, no tratamento de esgoto sanitário. 2005. 86 f. Dissertação (Mestrado em Engenharia Civil: Hidráulica e Saneamento) – Escola de Engenharia de São Carlos, Universidade de São Paulo, São Paulo, 2005. Tipo: Dissertação Sat, 01 Jan 2005 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/19198 2005-01-01T00:00:00Z