Tratamento de efluente anaeróbio em lagoas de polimento com alimentação contínua e batelada

Abstract

This work represents the post-treatment of effluent reactor UASB in polishing ponds fed with continuous flow and batch investigating different depths, in two experimental phases. In the first phase of work, the experimental system consisted of four polishing ponds in which two were monitored with continuous feed (LC57 and LC45) and two with semi-continuous (LB57 and LB45) and its tributary coming from pond transshipment, both ponds LC57 and LB57 (57 cm deep), for the ponds LC45 and LB45 (45 cm deep) had HDT 12 days. In the second phase of the work experimental consisted of three ponds, which two were fed in single and HDT batch of 8 days (LBT45 and LB245) with its arising tributaries respectively, LT and TE2, and fed continuously with HDT 12 days (LC245), both ponds of the second phase had 45 cm deep. In the first phase, the efficiencies of removals nitrogen overall kjeldahl, nitrogen ammonia and fecal coliforms of pond LC45 were respectively 55%, 71% and 99.3%, higher removals of ponds LC57 (53%, 62% and 99 , 3%), LB57 (39%, 47% and 96.9%) and LB45 (35%, 49% and 97.2%). In the second phase, the ponds with feeding batch and HDT eight days did not differ significantly from the pond with feed continuous and HDT of 12 days, but stood out for the displayed efficiencies, particularly thermotolerant coliforms, in which the pond LBT45 -1 obtained 1E + 03 UFC.100mL meet the WHO requirements for irrigation unrestricted. The ponds fed batch satisfactory results, allowing treat a greater number of tributaries in less time.