Evaluation Of Anaerobic Sludge Activity In
Wastewater Treatment Plants In Nicaragua
Author(s)
L. Korsak & L. Moreno
Abstract
Sludge of three municipal anaerobic wastewater treatment plants was evaluated.
This study was initiated due to the low activity observed in the anaerobic
wastewater treatment plants in Nicaragua. An additional goal to select one of
them, if possible, as an inoculum for the brewery treatment plant was proposed.
Two of these plants work with an Imhoff tank and one with a Septic tank
followed by an anaerobic upflow filter. The study consisted in the
characterization of biomass in terms of Specific Methanogenic Activity (SMA),
Volatile Suspended Solids (VSS), density, pH, and redox potential (RP). The
treated waters were also analysed for nutrients, heavy metals and the organic
load. The substrate used in the experiments for determining the methanogenic
activity was acetic acid. NaHCO3 was added to maintain pH in the normal range
of operation. The tests were carried out at a sludge load of 1.5 g VSS/l. The
results indicate that treated wastewater does not have any impediment to proper
development of microorganisms; no presence of toxic substances and enough
essential nutrients were detected. The specific methanogenic activity of sludge
(SMA) in the Imhoff tanks is relatively close and oscillates between 0.16-
0.28 g CH4-COD/g VSS/day, and in the septic tank is 0.09 g CH4-COD/g
VSS/day. These values agree with the methanogenic activity found in the
literature for septic tanks (0.02-0.1 g CH4-COD/gVSS/day). The highest
methanogenic activity measured during the test was 0.28g CH4-COD/g VSS/day
in the sludge of the Imhoff tank in The Viejo city, so this sludge could be
proposed as a seed for the brewery treatment plant.
Keywords: anaerobic treatment, sludge, municipal wastewater, specific
methanogenic activity, inoculum.
Keywords
anaerobic treatment, sludge, municipal wastewater, specific
methanogenic activity, inoculum.
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