TY - JOUR
T1 - Life cycle assessment of brucite and synthetic MgO produced from reject brine using different alkalis
AU - Shahbaz, Farah
AU - Singh, Inderjeet
AU - Krishnan, Padmaja
AU - Celik, Kemal
N1 - Funding Information:
The support received from the Abu Dhabi Department of Education and Knowledge (ADEK) for the grant ADHPG−RA686 is acknowledged. This work was supported by the NYUAD Center for Interacting Urban Networks (CITIES), funded by Tamkeen under the NYUAD Research Institute Award CG001 . The authors also thank Tamkeen for funding the NYUAD Water Research Center under the NYUAD Research Institute Award (project CG007 ).
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/12/20
Y1 - 2022/12/20
N2 - A cradle-to-gate life cycle assessment (LCA) approach is carried out to determine the environmental impact of brucite (Mg(OH)2) and synthetic magnesium oxide (MgO) recovered from reject brine in the United Arab Emirates (UAE) using SimaPro 9.1 software. The environmental impacts of synthetic Mg(OH)2 and MgO production were quantified using 18 ReCiPe midpoint indicators. Four different alkali sources, calcium oxide (CaO), sodium hydroxide (NaOH), ammonium hydroxide (NH4OH), and ethanolamine (C2H7NO), which can be utilized for the production of synthetic MgO, are considered. The results demonstrate that CaO was the most environmentally friendly alkali that can be used to produce synthetic Mg(OH)2 with the lowest environmental impact for all 18 ReCiPe midpoint indicators. The results for brucite and synthetic MgO production in the UAE were scaled up from laboratory experiments for LCA analysis and compared to the results of commercial MgO produced from the calcination of magnesite (MgCO3). The carbon dioxide equivalent (CO2 eq.) emissions for synthetic MgO generated from reject brine using CaO are 6.7–25.2% higher than that from commercial MgO. However, synthetic brucite recovered from reject brine using CaO produces 28.8–37.1% less CO2 eq. emissions compared to commercial MgO, making it a promising magnesium-based binder that can be adopted in the UAE.
AB - A cradle-to-gate life cycle assessment (LCA) approach is carried out to determine the environmental impact of brucite (Mg(OH)2) and synthetic magnesium oxide (MgO) recovered from reject brine in the United Arab Emirates (UAE) using SimaPro 9.1 software. The environmental impacts of synthetic Mg(OH)2 and MgO production were quantified using 18 ReCiPe midpoint indicators. Four different alkali sources, calcium oxide (CaO), sodium hydroxide (NaOH), ammonium hydroxide (NH4OH), and ethanolamine (C2H7NO), which can be utilized for the production of synthetic MgO, are considered. The results demonstrate that CaO was the most environmentally friendly alkali that can be used to produce synthetic Mg(OH)2 with the lowest environmental impact for all 18 ReCiPe midpoint indicators. The results for brucite and synthetic MgO production in the UAE were scaled up from laboratory experiments for LCA analysis and compared to the results of commercial MgO produced from the calcination of magnesite (MgCO3). The carbon dioxide equivalent (CO2 eq.) emissions for synthetic MgO generated from reject brine using CaO are 6.7–25.2% higher than that from commercial MgO. However, synthetic brucite recovered from reject brine using CaO produces 28.8–37.1% less CO2 eq. emissions compared to commercial MgO, making it a promising magnesium-based binder that can be adopted in the UAE.
KW - Brucite
KW - CO emissions
KW - Environmental impact
KW - Life cycle assessment
KW - Reactive magnesium oxide
KW - Reject desalination brine
UR - http://www.scopus.com/inward/record.url?scp=85141918443&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85141918443&partnerID=8YFLogxK
U2 - 10.1016/j.jclepro.2022.135071
DO - 10.1016/j.jclepro.2022.135071
M3 - Article
AN - SCOPUS:85141918443
SN - 0959-6526
VL - 380
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 135071
ER -