Efeito da variação temporal da vazão sobre o desempenho de um reator UASB.

Abstract

UASB. acronym of English Upflow anaerobic sludge blanket, is today the system more used for treatment sewer anaerobic the high rate. Several units treating domestic sewer, in real scale, are implanted at different countries and more systems are being built, with great results, in areas with tropical or subtropical climate. In Brazil several units in real scale are in satisfactory operation treating effluents of urban nets of sanitary sewers, above all in the State of Parana. Due to this new reality PROSAB - Programa de Saneamento Basico, coordinated by FINEP - Financiadora de Estudos e Projetos, it defined among themes with priorities, the treatment anaerobic of domestic sewers in reactors UASB. Thus, in Campina Grande, a series of researches is being developed with several groups of reactors type UASB, of different configurations and operational manners, besides associated with other modalities of treatments as ponds of stabilization. One of the works, the that he/she treats this dissertation, it consisted of the operation of three reactors, in pilot scale, feed-dos in a continuous and discontinuous way, simulating the variations of inflow that can be observed in the entrance of the treatment stations. Considering that wastewater flow moves along the day and that this variation it can be extremely elevated in function of the presence, for example, of pumping station inside of the system, to amount of the unit of treatment, the work had the objective significantly of verifying the behavior of reactors UASB for temporary ascendant speeds superiors to those for which it was projected. The work was divided in two stages, where in the first the three reactors, R l , R2 and R3, they worked in the following way: Rl with TDH = 6:00, during 24:00 o'clock serial, R2 with TDH = 3:00 in 12:00 followed and R3 with TDH = 1:30 in 6:00 of operation. In the second stage worked him with Rl under TDH = 3:00, during 24:00 o'clock serial, R2 with TDH = 1:30 in 12:00 followed and R3 with TDH = 0:45 in 6:00 of operation. The results indicated that for minimum TDH of up to 3:00, independent of the continuous nature or not of the feeding flow, the acting of the reactors was still satisfactory and that TDH inferior for 1:30 would not be advisable.