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<p>for effectively treating waste load fluctuations from variable occupancy situations. Supplemental feeding with something like sugar is sometimes used to sustain sludge <a href="page.php?w=microbial">microbial</a> populations during periods of low occupancy; but population response to variable food characteristics is unpredictable, and supplemental feeding increases waste sludge volumes. Sludge may be periodically removed by septic tank pumping trucks as sludge volume approaches storage capacity.</p>

<p><big>See also</big></p>
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* <a href="page.php?w=List_of_waste-water_treatment_technologies">List of waste-water treatment technologies</a></p><p>
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