Partially aerated attached biomass bed reactor applied to treatment sanitary sewage treatment / Reator com leito de biomassa aderida aerado parcialmente aplicado ao tratamento de esgoto sanitário

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

This work aimed to evaluate the performance of a full scale up-flow attached biomass bed reactor (159 M POT.3) and with continuous aeration at 7 m above bottom of the reactor to sanitary sewage treatment. The bed of the reactor was constituted for activated granular carbon, anthracite carbon and sand. The work was divided into two stages. In the first stage, hydrodynamics tests were made which consisted of the expansion/fluidization curve for the bioparticles of the bed of the full scale reactor and of the test of stimulus-response with tracer NACL. In the second stage, it monitored the performance of the attached biomass bed reactor operated with overlapping sector 1 (without aeration) and sector 2 (with aeration) and it utilized the recirculation to expand the bed. The expansion/fluidization curves of the bioparticles of the bed of the reactor showed that the bed of the reactor in the sector 1 was without expansion and in the sector 2 was expanded, under the operating conditions determined for this work. Of the test with NACLtracer obtained mean hydraulic detention time (HDTM) of 18,45 h for the test without recirculation and compressor off; and of 16,90 h for the test with recirculation and compressor on. The obtained HDTM were bigger than the theoretical HDT (equal at 12 h), probably due to at the diffusion of trace into biofilm. The stage II was divided into two phases, in the phase 1 mean theoretical HDT was of 12 h, and in the phase 2 was of 16 h. It verified low retention of solids in the system, since the effluent presented, during most of the monitoring period, concentrations of total solids and total suspended solids higher than the influent. The greater efficiency of COD removal of raw sample occurred in phase 2 and was of 32% under loading rate of 0,86kgCODraw/M POT.3.d. The mean amounts COD of filtered samples in the effluent were equal to 119 and 116mgO IND.2/L, which is equivalent ) to mean removals of 54% and 63%, respectively for phase 1 and 2. The higher efficiency of removal BOD filtered sample in the system was in phase 1 and was of 91%, with effluent presenting concentration of 19mg O IND.2/L. With respect to the TKN concentration, the system was little efficient in its removal and presented very low concentration of oxidized nitrogen (lower than 1mg NO IND.3POT.-1). The degree of ammonification was 89%, on average, when considered the TKN concentration in the filtered sample. It concluded that the system is not effective removing organic material and nutrients due to drag of solids and biological material in the effluent.

ASSUNTO(S)

attached biomass bed reactor drag of solids reator com leito de biomassa aderida remoção de matéria orgânica sanitary sewage removal organic matter esgotos sanitários removal nutrients remoção de nutrientes arraste de sólidos

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