Reduced gas pressure operation of sludge digesters: Expanded studies. Final report

doi:10.2172/10186304

Title: Reduced gas pressure operation of sludge digesters: Expanded studies. Final report

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Abstract

Previous investigations strongly suggested that the municipal anaerobic sludge digestion process could be enhanced by reactor operation with subatmospheric headspace pressures. Enhanced solids destruction and methane production along with increased process stability were observed in these earlier studies. However, due to the small scale of the anaerobic reactors used ( {approx}1.5 L), definitive steady-state measurements could not be obtained. These expanded studies were undertaken to verify and define the magnitude of the benefits that might be obtained with vacuum operation of sludge digesters. Four reactors ({approx}15.0 L) were fed municipal sludge at three different organic loading rates while being maintained with a 15-day solids retention time. One reactor had a constant headspace pressure of 1.02 atm; a second was maintained at 0.75 atm; and the remaining two reactors were operated for the majority of the day at 1.02 atm, and for part of the day with a 0.75 atm headspace pressure. Additional small-scale, batch experiments were performed to help identify controlling digestion mechanisms. The results of these expanded studies indicate that vacuum operation did not yield significant advantages over the organic loading range investigated (0.088 to 0.352 lb VSS/ft{sup 3}{center_dot}d).

Publication Date:: Wed Sep 01 00:00:00 EDT 1993

Research Org.:: New York State Energy Research and Development Authority, Albany, NY (United States); Niagara Mohawk Power Corp., Syracuse, NY (United States); Syracuse Univ., NY (United States). Dept. of Civil and Environmental Engineering

Sponsoring Org.:: New York State Energy Research and Development Authority, Albany, NY (United States)

OSTI Identifier:: 10186304

Report Number(s):: NYSERDA-93-12
ON: TI94000504; IN: 1581L-ERER-MW-91

Resource Type:: Technical Report

Resource Relation:: Other Information: PBD: Sep 1993

Country of Publication:: United States

Language:: English

Subject:: 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 59 BASIC BIOLOGICAL SCIENCES; MUNICIPAL WASTES; ANAEROBIC DIGESTION; SEWAGE SLUDGE; PROGRESS REPORT; BIOREACTORS; WATER TREATMENT PLANTS; SOLID WASTES; WASTE PROCESSING; WASTE PROCESSING PLANTS; METHANE; SYNTHESIS; VACUUM SYSTEMS; 320604; 550200; MUNICIPAL WASTE MANAGEMENT; BIOCHEMISTRY

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                    . Reduced gas pressure operation of sludge digesters: Expanded studies. Final report.  United States: N. p., 1993. 
        Web.  doi:10.2172/10186304.

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                    . Reduced gas pressure operation of sludge digesters: Expanded studies. Final report.  United States.  https://doi.org/10.2172/10186304

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                    . 1993.  
        "Reduced gas pressure operation of sludge digesters: Expanded studies. Final report".  United States.  https://doi.org/10.2172/10186304.  https://www.osti.gov/servlets/purl/10186304.

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@article{osti_10186304,

  title        = {Reduced gas pressure operation of sludge digesters: Expanded studies. Final report},

  author       = {},

  abstractNote = {Previous investigations strongly suggested that the municipal anaerobic sludge digestion process could be enhanced by reactor operation with subatmospheric headspace pressures. Enhanced solids destruction and methane production along with increased process stability were observed in these earlier studies. However, due to the small scale of the anaerobic reactors used ( {approx}1.5 L), definitive steady-state measurements could not be obtained. These expanded studies were undertaken to verify and define the magnitude of the benefits that might be obtained with vacuum operation of sludge digesters. Four reactors ({approx}15.0 L) were fed municipal sludge at three different organic loading rates while being maintained with a 15-day solids retention time. One reactor had a constant headspace pressure of 1.02 atm; a second was maintained at 0.75 atm; and the remaining two reactors were operated for the majority of the day at 1.02 atm, and for part of the day with a 0.75 atm headspace pressure. Additional small-scale, batch experiments were performed to help identify controlling digestion mechanisms. The results of these expanded studies indicate that vacuum operation did not yield significant advantages over the organic loading range investigated (0.088 to 0.352 lb VSS/ft{sup 3}{center_dot}d).},

  doi          = {10.2172/10186304},

  url          = {https://www.osti.gov/biblio/10186304},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Wed Sep 01 00:00:00 EDT 1993},

  month        = {Wed Sep 01 00:00:00 EDT 1993}

}

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