Reduction of microbial density level in sewage sludge through pH adjustment and ultrasonic treatment
Journal
Water Science and Technology
Journal Volume
42
Journal Issue
9
Pages
97-102
Date Issued
2000
Author(s)
Abstract
This work investigated the effects of using ultrasound and pH-value adjustment on the microbial density levels in sewage sludge, with total coliform and heterotrophic-plate-count (HPC) bacteria as the microbial indices. Application of ultrasound at a high intensity level could sufficiently disinfect both the total coliform and HPC bacteria. Adjustment of pH value could also disinfect the micro-organisms in the sewage sludge, but at a less efficient rate. For the present sewage sludge, the application of ultrasound of 0.33 W/mL level for 1-2 hours could make it a Class B sludge.This work investigated the effects of using ultrasound and pH-value adjustment on the microbial density levels in sewage sludge, with total coliform and heterotrophic-plate-count (HPC) bacteria as the microbial indices. Application of ultrasound at a high intensity level could sufficiently disinfect both the total coliform and HPC bacteria. Adjustment of pH value could also disinfect the micro-organisms in the sewage sludge, but at a less efficient rate. For the present sewage sludge, the application of ultrasound of 0.33 W/mL level of 1-2 hours could make it a Class B sludge.
Subjects
Microbial density
pH values
Pre-treatment
Ultrasound
SDGs
Other Subjects
Biodegradation; Coliform bacteria; pH effects; Reduction; Ultrasonics; Heterotrophic plate count bacteria; Microbial density level; Ultrasonic treatment; Sewage sludge; microbial pollutant; pH; pollutant removal; sludge; ultrasonic technique; activated sludge; bacterial count; coliform bacterium; conference paper; nonhuman; pH; sewage treatment; sludge disposal; ultrasound; waste water management
Type
journal article