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Primary sludge is typically handled through processes that involve thickening, stabilization, and eventual disposal or treatment. After being collected from sedimentation tanks, it may be thickened using gravity or mechanical means to reduce its volume. The thickened sludge is often stabilized through anaerobic digestion or aerobic digestion to reduce pathogens and odors before further treatment or land application. Ultimately, the treated sludge can be dewatered and either disposed of in landfills or repurposed as a soil amendment or fertilizer.

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