Pretreatment of high solid microbial sludges
Abstract
A process and apparatus for pretreating microbial sludges in order to enhance secondary anaerobic digestion. The pretreatment process involves disrupting the cellular integrity of municipal sewage sludge through a combination of thermal, explosive decompression and shear forces. The sludge is pressurized and pumped to a pretreatment reactor where it is mixed with steam to heat and soften the sludge. The pressure of the sludge is suddenly reduced and explosive decompression forces are imparted which partially disrupt the cellular integrity of the sludge. Shear forces are then applied to the sludge to further disrupt the cellular integrity of the sludge. Disrupting cellular integrity releases both soluble and insoluble organic constituents and thereby renders municipal sewage sludge more amenable to secondary anaerobic digestion.
- Inventors:
-
- Lakewood, CO
- Broomfield, CO
- Issue Date:
- Research Org.:
- Midwest Research Institute, Kansas City, MO (United States)
- OSTI Identifier:
- 871738
- Patent Number(s):
- 5785852
- Assignee:
- Midwest Research Institute (Kansas City, MI)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- DOE Contract Number:
- AC36-83CH10093
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- pretreatment; solid; microbial; sludges; process; apparatus; pretreating; enhance; secondary; anaerobic; digestion; involves; disrupting; cellular; integrity; municipal; sewage; sludge; combination; thermal; explosive; decompression; shear; forces; pressurized; pumped; reactor; mixed; steam; heat; soften; pressure; suddenly; reduced; imparted; partially; disrupt; applied; releases; soluble; insoluble; organic; constituents; renders; amenable; shear forces; process involves; treatment process; sewage sludge; pretreatment process; organic constituent; microbial sludges; insoluble organic; anaerobic digestion; shear force; compression forces; compression force; soluble organic; pretreating microbial; /210/
Citation Formats
Rivard, Christopher J, and Nagle, Nicholas J. Pretreatment of high solid microbial sludges. United States: N. p., 1998.
Web.
Rivard, Christopher J, & Nagle, Nicholas J. Pretreatment of high solid microbial sludges. United States.
Rivard, Christopher J, and Nagle, Nicholas J. Tue .
"Pretreatment of high solid microbial sludges". United States. https://www.osti.gov/servlets/purl/871738.
@article{osti_871738,
title = {Pretreatment of high solid microbial sludges},
author = {Rivard, Christopher J and Nagle, Nicholas J},
abstractNote = {A process and apparatus for pretreating microbial sludges in order to enhance secondary anaerobic digestion. The pretreatment process involves disrupting the cellular integrity of municipal sewage sludge through a combination of thermal, explosive decompression and shear forces. The sludge is pressurized and pumped to a pretreatment reactor where it is mixed with steam to heat and soften the sludge. The pressure of the sludge is suddenly reduced and explosive decompression forces are imparted which partially disrupt the cellular integrity of the sludge. Shear forces are then applied to the sludge to further disrupt the cellular integrity of the sludge. Disrupting cellular integrity releases both soluble and insoluble organic constituents and thereby renders municipal sewage sludge more amenable to secondary anaerobic digestion.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jul 21 00:00:00 EDT 1998},
month = {Tue Jul 21 00:00:00 EDT 1998}
}
Works referenced in this record:
Efficacy of hydrolytic enzyme augmentation and thermochemical pretreatments for increased secondary anaerobic digestion of treated municipal sewage sludges
journal, March 1992
- Nagle, N. J.; Rivard, C. J.; Adney, W. S.
- Applied Biochemistry and Biotechnology, Vol. 34-35, Issue 1