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Title: Bench-Scale Evaluation of the Genifuel Hydrothermal Processing Technology for Wastewater Solids

Abstract

Hydrothermal Liquefaction (HTL) and Catalytic Hydrothermal Gasification (CHG) proof-of-concept bench-scale tests were performed to assess the potential of the Genifuel hydrothermal process technology for handling municipal wastewater sludge. HTL tests were conducted at 300-350°C and 20 MPa on three different feeds: primary sludge (11.9 wt% solids), secondary sludge (9.7 wt% solids), and post-digester sludge (also referred to as digested solids) (16.0 wt% solids). Corresponding CHG tests were conducted at 350°C and 20 MPa on the HTL aqueous phase output using a ruthenium based catalyst. A comprehensive analysis of all feed and effluent phases was also performed. Total mass and carbon balances closed to within ± 15% in all but one case. Biocrude yields from HTL tests were 37%, 25%, and 34% for primary sludge, secondary sludge, and digested solids feeds, respectively. The biocrude yields accounted for 59%, 39%, and 49% of the carbon in the feed for primary sludge, secondary sludge, and digested solids feeds, respectively. Biocrude composition and quality were comparable to that seen with biocrudes generated from algae feeds. Subsequent hydrotreating (i.e., upgrading) of the biocrude produced from primary sludge and digested solids resulted in a product with comparable physical and chemical properties to petroleum crude oil. CHGmore » product gas consisted primarily of methane, with methane yields (relative to CHG input) on a carbon basis of 47%, 61%, and 64% for aqueous feeds that were the output of HTL tests with primary sludge, secondary sludge, and digested solids, respectively. Siloxane concentrations in the CHG product gas were below the detection limit and well below fuel input composition limits set by several engine manufacturers. Relative to that of the sludge feeds, the HTL-CHG process resulted in a reduction in chemical oxygen demand (COD) of greater than 99.9% and a reduction in residual solids for disposal of 94-99%. The test results, as a whole, support further long term testing in a larger scale integrated system that is representative of what would be installed at a water resource recovery facility (WRRF) in order to fully assess the technical and economic viability of this technology for wastewater sludge treatment.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1419920
Report Number(s):
PNNL-SA-127937
BM0102060
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the Water Environment Federation, (WEFTEC 2017), September 30 - October 4, 2017, Chicago, Illinois, 3032-3061
Country of Publication:
United States
Language:
English
Subject:
hydrothermal; liquefaction; biocrude; catalyst; gasification; hydrotreating; upgrading

Citation Formats

Marrone, Philip A., Elliott, Douglas C., Billing, Justin M., Hallen, Richard T., Hart, Todd R., Kadota, Paul, Moeller, Jeff C., Randel, Margaaret A., and Schmidt, Andrew J. Bench-Scale Evaluation of the Genifuel Hydrothermal Processing Technology for Wastewater Solids. United States: N. p., 2017. Web. doi:10.2175/193864717822157702.
Marrone, Philip A., Elliott, Douglas C., Billing, Justin M., Hallen, Richard T., Hart, Todd R., Kadota, Paul, Moeller, Jeff C., Randel, Margaaret A., & Schmidt, Andrew J. Bench-Scale Evaluation of the Genifuel Hydrothermal Processing Technology for Wastewater Solids. United States. doi:10.2175/193864717822157702.
Marrone, Philip A., Elliott, Douglas C., Billing, Justin M., Hallen, Richard T., Hart, Todd R., Kadota, Paul, Moeller, Jeff C., Randel, Margaaret A., and Schmidt, Andrew J. Tue . "Bench-Scale Evaluation of the Genifuel Hydrothermal Processing Technology for Wastewater Solids". United States. doi:10.2175/193864717822157702.
@article{osti_1419920,
title = {Bench-Scale Evaluation of the Genifuel Hydrothermal Processing Technology for Wastewater Solids},
author = {Marrone, Philip A. and Elliott, Douglas C. and Billing, Justin M. and Hallen, Richard T. and Hart, Todd R. and Kadota, Paul and Moeller, Jeff C. and Randel, Margaaret A. and Schmidt, Andrew J.},
abstractNote = {Hydrothermal Liquefaction (HTL) and Catalytic Hydrothermal Gasification (CHG) proof-of-concept bench-scale tests were performed to assess the potential of the Genifuel hydrothermal process technology for handling municipal wastewater sludge. HTL tests were conducted at 300-350°C and 20 MPa on three different feeds: primary sludge (11.9 wt% solids), secondary sludge (9.7 wt% solids), and post-digester sludge (also referred to as digested solids) (16.0 wt% solids). Corresponding CHG tests were conducted at 350°C and 20 MPa on the HTL aqueous phase output using a ruthenium based catalyst. A comprehensive analysis of all feed and effluent phases was also performed. Total mass and carbon balances closed to within ± 15% in all but one case. Biocrude yields from HTL tests were 37%, 25%, and 34% for primary sludge, secondary sludge, and digested solids feeds, respectively. The biocrude yields accounted for 59%, 39%, and 49% of the carbon in the feed for primary sludge, secondary sludge, and digested solids feeds, respectively. Biocrude composition and quality were comparable to that seen with biocrudes generated from algae feeds. Subsequent hydrotreating (i.e., upgrading) of the biocrude produced from primary sludge and digested solids resulted in a product with comparable physical and chemical properties to petroleum crude oil. CHG product gas consisted primarily of methane, with methane yields (relative to CHG input) on a carbon basis of 47%, 61%, and 64% for aqueous feeds that were the output of HTL tests with primary sludge, secondary sludge, and digested solids, respectively. Siloxane concentrations in the CHG product gas were below the detection limit and well below fuel input composition limits set by several engine manufacturers. Relative to that of the sludge feeds, the HTL-CHG process resulted in a reduction in chemical oxygen demand (COD) of greater than 99.9% and a reduction in residual solids for disposal of 94-99%. The test results, as a whole, support further long term testing in a larger scale integrated system that is representative of what would be installed at a water resource recovery facility (WRRF) in order to fully assess the technical and economic viability of this technology for wastewater sludge treatment.},
doi = {10.2175/193864717822157702},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 03 00:00:00 EDT 2017},
month = {Tue Oct 03 00:00:00 EDT 2017}
}

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