Biodegradation of linear alkylbenzene sulfonate in anaerobic sequencing biofilm batch reactor with biomass immobilization in charcoal / Degradação de alquilbenzeno linear sulfonado em reator anaeróbio operado em bateladas seqüenciais com biomassa imobilizada em carvão vegetal

AUTOR(ES)

Joel Dias Pinheiro Filho

DATA DE PUBLICAÇÃO

2008

RESUMO

This work used an anaerobic sequencing biofilm batch reactor aiming the removal and degradation of the linear alkylbenzene sulfonate (LAS). Biomass from an UASB reactor treating suine wastewater was immobilized in charcoal fragments. The reactor was fed with synthetic substrate with addition of LAS. Feeding happened in four stages: (1) synthetic substrate without LAS, (2) synthetic substrate with LAS at 12 ±3 mg/L, (3) synthetic substrate with LAS at 32 ±5 mg/L and (4) synthetic substrate with LAS at 10 ±2 mg/L. The reactor, which was monitored for 256 days, has shown good stability under low LAS concentrations (12 ±3 e 10 ±2 mg/L). Rising in LAS concentration to 32 ±5 mg/L have negatively influenced anaerobic digestion. At this concentration, the lowest organic matter removal efficiency (55% ±12 p.p.) was attained and alkalinity consumption took place (lowest value of 241 mgCaCO3/L) associated with amassing of volatile acids (peak value of 97 mgHAc/L). Under these conditions, the ill-suited performance shown by the reactor is assumed to be caused by the compromising of the reactors hydrodynamics properties, which could have been affected by the observed extracellular polymers overproduction. The reactor showed good performance recovery when the LAS concentration was lowered to 10 ±2 mg/L. The last stage reached 70% ±5 p.p. of organic matter removal efficiency within 61 days. LAS mass balance indicated that 18% of the mass affluent to the reactor were removed by biodegradation and adsorption, while 16% were biologically degraded. Upon the obtained results, it was concluded that the proposed configuration is not suited in treating wastewaters containing LAS. Microscopic investigations have revealed notable microbial morphological variety and it could not been distinguished significative differences between inoculums and reactors samples microbial morphologies. Through Molecular Biology techniques (PCR/DGGE), it was observed that the support material has allowed growth of some bacterial populations that were not found in the inoculum.

ASSUNTO(S)

las asbbr surfactante asbbr surfactant carvão vegetal charcoal adsorção las adsorption

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