Optimizing energy yields from nutrient recycling using sequential hydrothermal liquefaction with Galdieria sulphuraria

T. Selvaratnam, H. Reddy, Tapaswy Muppaneni, F. O. Holguin, N. Nirmalakhandan, Peter Lammers, Shuguang Deng

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Hydrothermal liquefaction (HTL) provides a promising option for extracting bio-crude oil from wet algal biomass. One of the byproducts of HTL is an aqueous phase (AP) rich in organic carbon and nutrients. This study evaluated the hypothesis that recycling the AP to the cultivation step could enhance biomass productivity and net energy yield. Since the yields of bio-crude and nutrients post-HTL are functions of HTL reaction temperature, this study evaluated the impact of reaction temperature on net energy yield. Nutrient recycle experiments were conducted with a low-lipid, acidophilic strain, Galdieria sulphuraria, being developed for single-step removal of organic carbon, nitrogen and phosphorus from urban wastewater. G. sulphuraria was cultivated in different dilutions of the AP generated by HTL performed between 180 and 300. °C. Biomass productivity recorded in this study with recycled AP was greater than that in the control by a factor as much as 1.94. Estimates of net energy yields indicate the optimum temperature for the second-stage HTL bio-crude oil extraction from G. sulphuraria to be 280 to 300. °C.

Original languageEnglish (US)
Pages (from-to)74-79
Number of pages6
JournalAlgal Research
Volume12
DOIs
StatePublished - Nov 1 2015
Externally publishedYes

Fingerprint

recycling
energy
nutrients
biomass
water
oils
temperature
carbon
byproducts
wastewater
liquefaction
phosphorus
nitrogen
lipids

Keywords

  • Bio-crude oil
  • Hydrothermal liquefaction
  • Net energy yield
  • Nutrient recycle

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Optimizing energy yields from nutrient recycling using sequential hydrothermal liquefaction with Galdieria sulphuraria. / Selvaratnam, T.; Reddy, H.; Muppaneni, Tapaswy; Holguin, F. O.; Nirmalakhandan, N.; Lammers, Peter; Deng, Shuguang.

In: Algal Research, Vol. 12, 01.11.2015, p. 74-79.

Research output: Contribution to journalArticle

Selvaratnam, T. ; Reddy, H. ; Muppaneni, Tapaswy ; Holguin, F. O. ; Nirmalakhandan, N. ; Lammers, Peter ; Deng, Shuguang. / Optimizing energy yields from nutrient recycling using sequential hydrothermal liquefaction with Galdieria sulphuraria. In: Algal Research. 2015 ; Vol. 12. pp. 74-79.
@article{0421f9df11eb4f56b94b595c6b559a2a,
title = "Optimizing energy yields from nutrient recycling using sequential hydrothermal liquefaction with Galdieria sulphuraria",
abstract = "Hydrothermal liquefaction (HTL) provides a promising option for extracting bio-crude oil from wet algal biomass. One of the byproducts of HTL is an aqueous phase (AP) rich in organic carbon and nutrients. This study evaluated the hypothesis that recycling the AP to the cultivation step could enhance biomass productivity and net energy yield. Since the yields of bio-crude and nutrients post-HTL are functions of HTL reaction temperature, this study evaluated the impact of reaction temperature on net energy yield. Nutrient recycle experiments were conducted with a low-lipid, acidophilic strain, Galdieria sulphuraria, being developed for single-step removal of organic carbon, nitrogen and phosphorus from urban wastewater. G. sulphuraria was cultivated in different dilutions of the AP generated by HTL performed between 180 and 300. °C. Biomass productivity recorded in this study with recycled AP was greater than that in the control by a factor as much as 1.94. Estimates of net energy yields indicate the optimum temperature for the second-stage HTL bio-crude oil extraction from G. sulphuraria to be 280 to 300. °C.",
keywords = "Bio-crude oil, Hydrothermal liquefaction, Net energy yield, Nutrient recycle",
author = "T. Selvaratnam and H. Reddy and Tapaswy Muppaneni and Holguin, {F. O.} and N. Nirmalakhandan and Peter Lammers and Shuguang Deng",
year = "2015",
month = "11",
day = "1",
doi = "10.1016/j.algal.2015.07.007",
language = "English (US)",
volume = "12",
pages = "74--79",
journal = "Algal Research",
issn = "2211-9264",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Optimizing energy yields from nutrient recycling using sequential hydrothermal liquefaction with Galdieria sulphuraria

AU - Selvaratnam, T.

AU - Reddy, H.

AU - Muppaneni, Tapaswy

AU - Holguin, F. O.

AU - Nirmalakhandan, N.

AU - Lammers, Peter

AU - Deng, Shuguang

PY - 2015/11/1

Y1 - 2015/11/1

N2 - Hydrothermal liquefaction (HTL) provides a promising option for extracting bio-crude oil from wet algal biomass. One of the byproducts of HTL is an aqueous phase (AP) rich in organic carbon and nutrients. This study evaluated the hypothesis that recycling the AP to the cultivation step could enhance biomass productivity and net energy yield. Since the yields of bio-crude and nutrients post-HTL are functions of HTL reaction temperature, this study evaluated the impact of reaction temperature on net energy yield. Nutrient recycle experiments were conducted with a low-lipid, acidophilic strain, Galdieria sulphuraria, being developed for single-step removal of organic carbon, nitrogen and phosphorus from urban wastewater. G. sulphuraria was cultivated in different dilutions of the AP generated by HTL performed between 180 and 300. °C. Biomass productivity recorded in this study with recycled AP was greater than that in the control by a factor as much as 1.94. Estimates of net energy yields indicate the optimum temperature for the second-stage HTL bio-crude oil extraction from G. sulphuraria to be 280 to 300. °C.

AB - Hydrothermal liquefaction (HTL) provides a promising option for extracting bio-crude oil from wet algal biomass. One of the byproducts of HTL is an aqueous phase (AP) rich in organic carbon and nutrients. This study evaluated the hypothesis that recycling the AP to the cultivation step could enhance biomass productivity and net energy yield. Since the yields of bio-crude and nutrients post-HTL are functions of HTL reaction temperature, this study evaluated the impact of reaction temperature on net energy yield. Nutrient recycle experiments were conducted with a low-lipid, acidophilic strain, Galdieria sulphuraria, being developed for single-step removal of organic carbon, nitrogen and phosphorus from urban wastewater. G. sulphuraria was cultivated in different dilutions of the AP generated by HTL performed between 180 and 300. °C. Biomass productivity recorded in this study with recycled AP was greater than that in the control by a factor as much as 1.94. Estimates of net energy yields indicate the optimum temperature for the second-stage HTL bio-crude oil extraction from G. sulphuraria to be 280 to 300. °C.

KW - Bio-crude oil

KW - Hydrothermal liquefaction

KW - Net energy yield

KW - Nutrient recycle

UR - http://www.scopus.com/inward/record.url?scp=84947935904&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84947935904&partnerID=8YFLogxK

U2 - 10.1016/j.algal.2015.07.007

DO - 10.1016/j.algal.2015.07.007

M3 - Article

AN - SCOPUS:84947935904

VL - 12

SP - 74

EP - 79

JO - Algal Research

JF - Algal Research

SN - 2211-9264

ER -