Ammonia stripping of hydrothermal liquefaction aqueous phase from municipal sludge for anaerobic co-digestion pretreatment and ammonia recovery
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Cox, Alison E
issued: 2024-05-27T21:41:29Z
issued: 2024
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Hydrothermal Liquefaction (HTL) is a thermo-chemical method of processing wastewater solids that could be preferential over anaerobic digestion (AD) because it produces no biosolids. Instead, the effluent can be separated into biocrude which can be refined into fuel, hydrochar that can be used for adsorption applications and HTL aqueous, the only waste stream of this process. Unfortunately, HTL aqueous is high in ammonia, phenolics and nitrogen heterocyclic compounds that can inhibit AD if it is used for disposal. Ammonia stripping was tested for pretreatment of HTL aqueous and recovering ammonia. Seven stripping reactor conditions were run, and the best results were seen at 85°C, a pH of 9.3 and 500 mL/min air flow rate. This case achieved ammonia removal of 99.5 ± 0.1% and total phenolic compounds removal of 32 ± 1% in 4 hours. The ammonia stripping was coupled with acid adsorption to produce an ammonium sulphate salt with value as fertilizer. The ideal ammonia stripping conditions produced a salt with a purity of 98.0 ± 0.05% and represented an ammonia recovery of 73.9 ± 0.04%. Semi-continuous flow bench-scale thermophilic anaerobic co-digestion of HTL aqueous with municipal sludge found that 12% of influent chemical oxygen demand (COD) can come from HTL aqueous without inhibition if pretreated with ammonia stripping, while the digester fed 13% of COD from non-pretreated HTL aqueous showed inhibition. Under mesophilic conditions, semi-continuous flow anaerobic co-digestion was successful for digesters fed with either 24% non-pretreated HTL aqueous or 22% pretreated HTL aqueous.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/88379
note: AMMONIA STRIPPING OF HYDROTHERMAL LIQUEFACTION AQUEOUS PHASE FROM MUNICIPAL SLUDGE FOR ANAEROBIC CO-DIGESTION PRETREATMENT AND AMMONIA RECOVERY By Alison E Cox B.Eng., University of Guelph, 2019 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Civil Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) May 2024 © Alison Cox, 2024 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis entitled: Ammonia Stripping of Hydrothermal Liquefaction Aqueous Phase from Municipal Sludge for Anaerobic Co-digestion Pretreatment and Ammonia Recovery submitted by Alison Cox in partial fulfillment of the requirements of the degree of Master of Applied Science. Dr. Cigdem Eskicioglu, School of Engineering Supervisor Dr. Nicolas Peleato, School of Engineering Supervisory Committee Member Dr. Alyse Kiesser, School of Engineering Supervisory Committee Member Dr. Sepideh Pakpour, School of Engineering University Examiner Click or tap here to enter text. iii Abstract Hydrothermal Liquefaction (HTL) is a thermo-chemical method of processing wastewater solids that could be preferential over anaerobic digestion (AD) because it produces no biosolids. Instead, the effluent can be separated into biocrude which can be refined into fuel, hydrochar that can be used for adsorption applications and HTL aqueous, the only waste stream of this process. Unfortunately, HTL aqueous is high in ammonia, phenolics and nitrogen heterocyclic compounds that can inhibit AD if it is used for disposal. Ammonia stripping was tested for pretreatment of HTL aqueous and recovering ammonia. Seven stripping reactor conditions were run, and the best results were seen at 85°C, a pH of 9.3 and 500 mL/min air flow rate. This case achieved ammonia removal of 99.5 ± 0.1% and total phenolic compounds removal of 32 ± 1% in 4 hours. The ammonia stripping wa…
has type: Thesis/Dissertation
date issued: 2024-09
is shown at: 10.14288/1.0443806
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Eskicioglu, Cigdem
type: Text
identifier URI: http://hdl.handle.net/2429/88379