In Situ Sludge Reduction By Microorganisms
Author(s)
S. Banerjee & U. Hooda
Abstract
A mixture of facultative microorganisms added to pulp mill aeration stabilization
basins is able to reduce sludge in situ over several months. Laboratory work
shows that pulp fibers exposed to a cell-free extract prepared from the
microorganisms are degraded through consumption of their hemicellulosic
fraction. However, the process is quite slow; a controlled field study run for
seven months did not lead to mineralization of the sludge.
Keywords: sludge, microorganisms, hemicellulose, treatment systems, fiber,
ASB.
1 Introduction
Wastewater treatment in the paper industry is done with activated sludge systems
or with aerated stabilization basins, ASBs [1, 2]. ASBs need to be dredged
periodically and the associated sludge handling and disposal costs are substantial
[3, 4]. A recent innovation introduced by Remediation Resources Inc (RRI) of
Pembroke, GA, controls the sludge depth in situ by introducing a suite of
Pseudonomads (isolated from oil well corings) into the inlet of the lagoon. The
organisms are grown onsite in a fermenter fed by an influent sidestream and are
released continuously into the lagoon. The microorganism formulation
combines the desiccated Pseudonomads with nutrients and is supported on
carbon beads, which are continuously dispensed into the fermenter. A number of
mills have confirmed that releasing the RRI mcroorganisms into the lagoon leads
to a gradual reduction of the sludge bed. In one mill, a sludge inventory of
600,000 m 3 decreased by 90,000 m 3 over a year [5]. In another, the hydraulic
retention time increased from 2.5 to 3.4 days over two years [6]. In this paper
we review laboratory and field work in light of the mechanism [7] of the process.
Keywords
sludge, microorganisms, hemicellulose, treatment systems, fiber,
ASB.
Related Book
Other papers in this volume
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