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Article: Lactic acid production from food waste at an anaerobic digestion biorefinery: effect of digestate recirculation and sucrose supplementation.

Bühlmann, Christopher H / Mickan, Bede S / Tait, Stephan / Batstone, Damien J / Bahri, Parisa A

Frontiers in bioengineering and biotechnology

2023 Volume 11, Page(s) 1177739

Abstract: Low lactic acid (LA) yields from direct food waste (FW) fermentation restrict this production pathway. However, nitrogen and other nutrients within FW digestate, in combination with sucrose supplementation, may enhance LA production and improve ... ...

Abstract	Low lactic acid (LA) yields from direct food waste (FW) fermentation restrict this production pathway. However, nitrogen and other nutrients within FW digestate, in combination with sucrose supplementation, may enhance LA production and improve feasibility of fermentation. Therefore, this work aimed to improve LA fermentation from FWs by supplementing nitrogen (0-400 mgN·L
Language	English
Publishing date	2023-05-12
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2719493-0
ISSN	2296-4185
ISSN	2296-4185
DOI	10.3389/fbioe.2023.1177739
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Biosolids-derived fertilisers: A review of challenges and opportunities.

Marchuk, Serhiy / Tait, Stephan / Sinha, Payel / Harris, Peter / Antille, Diogenes L / McCabe, Bernadette K

The Science of the total environment

2023 Volume 875, Page(s) 162555

Abstract: Soil application of biosolids as an organic fertiliser continues to be a cost-effective way to beneficially utilise its carbon and nutrient contents to maintain soil fertility. However, ongoing concerns over microplastics and persistent organic ... ...

Abstract	Soil application of biosolids as an organic fertiliser continues to be a cost-effective way to beneficially utilise its carbon and nutrient contents to maintain soil fertility. However, ongoing concerns over microplastics and persistent organic contaminants means that land-application of biosolids has come under increased scrutiny. To identify a way forward for the ongoing future use of biosolids-derived fertilisers in agriculture, the current work presents a critical review of: (1) contaminants of concern in biosolids and how regulatory approaches can address these to enable on-going beneficial reuse, (2) nutrient contents and bioavailability in biosolids to understand agronomic potential, (3) developments in extractive technologies to preserve and recover nutrients from biosolids before destructive dissipation when the biosolids are thermally processed to deal with persistent contaminants of concern (e.g. microplastics), and (4) use of the recovered nutrients, and the biochar produced by thermal processing, in novel organomineral fertilisers that match specific equipment, crop and soil requirements of broad-acre cropping. Several challenges were identified and recommendations for prioritisation of future research and development are provided to enable safe beneficial reuse of biosolids-derived fertilisers. Opportunities include more efficient technologies to preserve, extract and reuse nutrients from sewage sludge and biosolids, and the production of organomineral fertiliser products with characteristics that enable reliable widespread use across broad-acre agriculture.
MeSH term(s)	Fertilizers ; Biosolids ; Microplastics ; Plastics ; Soil ; Agriculture ; Sewage
Chemical Substances	Fertilizers ; Biosolids ; Microplastics ; Plastics ; Soil ; Sewage
Language	English
Publishing date	2023-03-06
Publishing country	Netherlands
Document type	Journal Article ; Review
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2023.162555
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Article ; Online: Biochemical methane potential of dairy manure residues and separated fractions: An Australia-wide study of the impact of production and cleaning systems.

Grell, Torben / Harris, Peter W / Marchuk, Serhiy / Jenkins, Sasha / McCabe, Bernadette K / Tait, Stephan

Bioresource technology

2023 Volume 391, Issue Pt A, Page(s) 129903

Abstract: This study investigated biochemical methane potential ( ... ...

Abstract	This study investigated biochemical methane potential (B
MeSH term(s)	Manure ; Methane ; Anaerobiosis ; Australia ; Biofuels
Chemical Substances	Manure ; Methane (OP0UW79H66) ; Biofuels
Language	English
Publishing date	2023-10-24
Publishing country	England
Document type	Journal Article
ZDB-ID	1065195-0
ISSN	1873-2976 ; 0960-8524
ISSN (online)	1873-2976
ISSN	0960-8524
DOI	10.1016/j.biortech.2023.129903
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Article ; Online: Biosolids-derived fertilisers: A review of challenges and opportunities

Marchuk, Serhiy / Tait, Stephan / Sinha, Payel / Harris, Peter / Antille, Diogenes L. / McCabe, Bernadette K.

Science of the Total Environment. 2023 June, v. 875 p.162555-

2023

Abstract	Soil application of biosolids as an organic fertiliser continues to be a cost-effective way to beneficially utilise its carbon and nutrient contents to maintain soil fertility. However, ongoing concerns over microplastics and persistent organic contaminants means that land-application of biosolids has come under increased scrutiny. To identify a way forward for the ongoing future use of biosolids-derived fertilisers in agriculture, the current work presents a critical review of: (1) contaminants of concern in biosolids and how regulatory approaches can address these to enable on-going beneficial reuse, (2) nutrient contents and bioavailability in biosolids to understand agronomic potential, (3) developments in extractive technologies to preserve and recover nutrients from biosolids before destructive dissipation when the biosolids are thermally processed to deal with persistent contaminants of concern (e.g. microplastics), and (4) use of the recovered nutrients, and the biochar produced by thermal processing, in novel organomineral fertilisers that match specific equipment, crop and soil requirements of broad-acre cropping. Several challenges were identified and recommendations for prioritisation of future research and development are provided to enable safe beneficial reuse of biosolids-derived fertilisers. Opportunities include more efficient technologies to preserve, extract and reuse nutrients from sewage sludge and biosolids, and the production of organomineral fertiliser products with characteristics that enable reliable widespread use across broad-acre agriculture.
Keywords	bioavailability ; biochar ; biosolids ; carbon ; cost effectiveness ; environment ; equipment ; land application ; microplastics ; organic fertilizers ; prioritization ; research and development ; sewage sludge ; soil ; soil fertility ; soil treatment ; ACT ; ANZBP ; AWA ; COD ; CSIRO ; EBPR ; EoWC ; EPA ; EU ; FRV ; NBRP ; NLBAR ; NSW ; NT ; OMF ; PFAS ; PFOA ; PFOS ; PRR ; QLD ; SA ; TAS ; VIC ; WA ; WWTP ; Nutrients recycling ; Agronomic value ; Regulation ; Sustainable management
Language	English
Dates of publication	2023-06
Publishing place	Elsevier B.V.
Document type	Article ; Online
Note	Use and reproduction
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2023.162555
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Article: Resource recovery for environmental management of dilute livestock manure using a solid separation approach

Grell, Torben / Marchuk, Serhiy / Williams, Ian / McCabe, Bernadette K. / Tait, Stephan

Journal of environmental management. 2022 Sept. 09,

2022

Abstract: Mechanical solid-liquid separation is an emerging closed-loop technology to recover and recycle carbon, nutrients and water from dilute livestock manure. This closed-loop concept is tested using a modular separation technology (Z-Filter) applied at full- ... ...

Abstract	Mechanical solid-liquid separation is an emerging closed-loop technology to recover and recycle carbon, nutrients and water from dilute livestock manure. This closed-loop concept is tested using a modular separation technology (Z-Filter) applied at full-scale for the first time to treat effluent from a pasture-based dairy. Effluent flow rates were 200–400 L min⁻¹ at a total solids (TS) content of 0.52% (pH 7.2). Separation efficiency and composition of the separated solid fraction were determined, and chemically-assisted separation with cationic polymer flocculant with/without hydrated lime was also tested. Without flocculant and lime, 25.9% of TS and 33.4% of volatile solids (VS) ended up in the solid fraction, but total Kjeldahl nitrogen (TKN), phosphorus (P) and potassium recovery was not significant, likely being in poorly separable fine particle or soluble fractions. With a 5% flow-based dosage of flocculant, most of the TS (69%) and VS (85%), and notable amounts of TKN (52–56%) and P (40%) ended up in the solid fraction. Phosphorus recovery was further increased to 91% when both flocculant and hydrated lime was added up to pH 9.2. The solid fraction was stackable with 16–20% TS, making transport more economical to enable further processing and beneficial reuse of nutrients and organic matter. Removal of VS also reduces fugitive methane emissions from uncovered anaerobic effluent ponds. Overall, the results indicated that solid-liquid separation could provide improved environmental management options for dairy farmers with dilute manure effluent to beneficially utilise organic matter and nutrients.
Keywords	animal manures ; calcium hydroxide ; carbon ; environmental management ; flocculants ; methane ; organic matter ; pH ; phosphorus ; polymers ; potassium ; total Kjeldahl nitrogen
Language	English
Dates of publication	2022-0909
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ZDB-ID	184882-3
ISSN	1095-8630 ; 0301-4797
ISSN (online)	1095-8630
ISSN	0301-4797
DOI	10.1016/j.jenvman.2022.116254
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Article ; Online: Resource recovery for environmental management of dilute livestock manure using a solid-liquid separation approach.

Grell, Torben / Marchuk, Serhiy / Williams, Ian / McCabe, Bernadette K / Tait, Stephan

Journal of environmental management

2022 Volume 325, Issue Pt A, Page(s) 116254

Abstract	Mechanical solid-liquid separation is an emerging closed-loop technology to recover and recycle carbon, nutrients and water from dilute livestock manure. This closed-loop concept is tested using a modular separation technology (Z-Filter) applied at full-scale for the first time to treat effluent from a pasture-based dairy. Effluent flow rates were 200-400 L min
MeSH term(s)	Animals ; Manure ; Livestock ; Conservation of Natural Resources ; Phosphorus ; Nitrogen ; Anaerobiosis
Chemical Substances	Manure ; lime (C7X2M0VVNH) ; Phosphorus (27YLU75U4W) ; Nitrogen (N762921K75)
Language	English
Publishing date	2022-10-18
Publishing country	England
Document type	Journal Article
ZDB-ID	184882-3
ISSN	1095-8630 ; 0301-4797
ISSN (online)	1095-8630
ISSN	0301-4797
DOI	10.1016/j.jenvman.2022.116254
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Article: 'Now that I am connected this isn't social isolation, this is engaging with people': Staying connected during the COVID-19 pandemic.

Spassiani, Natasha A / Becaj, Mojca / Miller, Clare / Hiddleston, Andrew / Hume, Aaron / Tait, Stephan

British journal of learning disabilities

2022

Abstract: Background: The COVID-19 global pandemic has put adults with intellectual/developmental disabilities at greater risk of being socially excluded due to physical distancing. Technology has been looked at as a tool for adults with intellectual/ ... ...

Abstract	Background: The COVID-19 global pandemic has put adults with intellectual/developmental disabilities at greater risk of being socially excluded due to physical distancing. Technology has been looked at as a tool for adults with intellectual/developmental disabilities to stay connected, however, little is known about this topic. The purpose of this study was to explore how a grassroots disability organisation used technology to help adults with intellectual/developmental disabilities feel socially connected during the pandemic. Methods: Data were collected through questionnaires, attendance records, and field notes; and analysed through trend and thematic analysis. Findings: Four main themes emerged from the data: active leadership, mental wellbeing, technology/digital inclusion, and safety. Conclusion: These findings suggest that when participants overcome technological barriers they found it easy to socially connect online during lockdown.
Language	English
Publishing date	2022-04-22
Publishing country	England
Document type	Journal Article
ZDB-ID	2019919-3
ISSN	1468-3156 ; 1354-4187
ISSN (online)	1468-3156
ISSN	1354-4187
DOI	10.1111/bld.12478
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Article: Lactic acid from mixed food waste fermentation using an adapted inoculum: Influence of pH and temperature regulation on yield and product spectrum

Bühlmann, Christopher H. / Mickan, Bede S. / Tait, Stephan / Batstone, Damien J. / Mercer, George D. / Bahri, Parisa A.

Journal of cleaner production. 2022 Aug. 17,

2022

Abstract: Environmental conditions (pH and temperature) are expected to influence microbial community composition and product spectrum in mixed-culture food waste (FW) fermentation. However, some conditions may favour growth of multiple organisms that compete for ... ...

Abstract	Environmental conditions (pH and temperature) are expected to influence microbial community composition and product spectrum in mixed-culture food waste (FW) fermentation. However, some conditions may favour growth of multiple organisms that compete for common substrates or consume target metabolites. The inoculum plays an integral role in mixed-culture fermentation, but it is currently unknown how an adapted inoculum, known to selectively produce the target metabolite, would influence fermentation, and how environmental conditions could control fermentation outcomes. Therefore, this study assessed the effects of pH (uncontrolled vs. controlled pH 4–6) and temperature (35–60 °C) on lactic acid (LA) from synthetic mixed FW batch fermentation (80 gVS·L⁻¹) utilising an adapted fermentation inoculum known to produce significant LA (10% inoculum volume). Concentrations of LA and competing organic acids were measured. Uncontrolled pH encouraged Lactobacillus growth but resulted in a low LA yield due to inhibitory conditions. Controlled pH 6 improved LA production but introduced LA consumption and competitive butyrate production. Observed butyrate production was dependent on pH and temperature and correlated with the growth of Clostridium Sensu Stricto 12. At pH 6 and 50 °C, observable LA consumption was eliminated, and the LA yield was maximised at 0.55 gLA·gVS⁻¹ (39 gLA·L⁻¹) while Lactobacillus remained dominant. The adapted inoculum effectively promoted LA production, while pH and temperature regulation were effective control levers to target LA.
Keywords	Clostridium ; Lactobacillus ; batch fermentation ; butyrates ; community structure ; food waste ; inoculum ; lactic acid ; metabolites ; microbial communities ; mixed culture ; pH ; temperature
Language	English
Dates of publication	2022-0817
Publishing place	Elsevier Ltd
Document type	Article
Note	Pre-press version
ISSN	0959-6526
DOI	10.1016/j.jclepro.2022.133716
Database	NAL-Catalogue (AGRICOLA)

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Article: Lactic acid from mixed food wastes at a commercial biogas facility: Effect of feedstock and process conditions

Bühlmann, Christopher H / Mickan, Bede S / Tait, Stephan / Renton, Michael / Bahri, Parisa A

Journal of cleaner production. 2021 Feb. 15, v. 284

2021

Abstract: Anaerobic digestion facilities can become biorefineries to produce higher-value products together with biogas energy and nutrient-rich digestate. To inform future biorefinery concepts with lactic acid recovery, the current study monitored organic acids ... ...

Abstract	Anaerobic digestion facilities can become biorefineries to produce higher-value products together with biogas energy and nutrient-rich digestate. To inform future biorefinery concepts with lactic acid recovery, the current study monitored organic acids in a pre-fermentation stage at a commercial anaerobic digestion facility. The study assessed lactic acid production performance and the impact of mixed food waste feedstocks and process conditions. Feed rate and feedstock composition varied weekly with waste availability. Normal operating conditions of the pre-fermentation stage included warm ambient conditions (24–35 °C), low pH (3.45 ± 0.03), a short hydraulic retention time (1–3.5 days) and stable organic loading rate (12 ± 2 kgVS.m⁻³.day⁻¹). These conditions favoured lactic acid, being dominant at an encouraging average concentration of 21.70 g L⁻¹, notably without any process optimisation or control. Lactobacillus constituted the majority of the microbial community in the pre-fermentation stage (98.1 %–99.1 % relative abundance) with an unknown Lactobacillus species and L. reuteri being the major species present. Grain processing waste and milk paste were positive influencers of LA concentration. The monitoring results, together with a simple economic evaluation, indicated that lactic acid recovery from a commercial food waste anaerobic digestion facility had baseline feasibility. In addition, there would be significant opportunities to increase economic performance by targeted process control and optimisation.
Keywords	Lactobacillus ; anaerobic digestion ; biogas ; biorefining ; economic evaluation ; economic performance ; energy ; feedstocks ; food waste ; lactic acid ; microbial communities ; milk ; monitoring ; pH ; process control ; processing waste
Language	English
Dates of publication	2021-0215
Publishing place	Elsevier Ltd
Document type	Article
Note	NAL-light
ISSN	0959-6526
DOI	10.1016/j.jclepro.2020.125243
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Article: Biomass production of marine microalga Tetraselmis suecica using biogas and wastewater as nutrients

Herold, Clemens / Ishika, Tasneema / Nwoba, Emeka G / Tait, Stephan / Ward, Andrew / Moheimani, Navid R

Biomass and bioenergy. 2021 Feb., v. 145

2021

Abstract: Anaerobic digestion is a suitable method for treating organic wastes and generating biogas. This biogas contains significant amount of CO₂ and some other contaminants. The coupling of wastewater treatment with biogas purification using saline microalgae ... ...

Abstract	Anaerobic digestion is a suitable method for treating organic wastes and generating biogas. This biogas contains significant amount of CO₂ and some other contaminants. The coupling of wastewater treatment with biogas purification using saline microalgae could effectively upgrade biogas (through photosynthetic CO₂ fixation) and concurrently remove nutrients from the effluent, while producing valuable algal biomass. In this context, Tetraselmis suecica biomass production with the use of an impurity (CO₂) in biogas to supply carbon, and nutrients (nitrogen and phosphorus) from anaerobically-digested piggery effluent (ADPE) was investigated at four operating pH set points (6.5, 7.5, 8.5 and 9.5). Results showed that pH 7.5 produced the optimum conditions for T. suecica growth and biogas-based CO₂ removal, with the maximum biomass (59.8 mg L⁻¹ d⁻¹), lipid (25 mg L⁻¹ d⁻¹) and carbohydrate (6.5 mg L-1 d-1) productivities. Under this condition, CO₂, total nitrogen and phosphorus removal efficiencies were 94.7%, 96% and 72%, respectively. Furthermore, the results showed no inhibitory effect of dissolved CH₄ on the growth of T. suecica at pH 7.5, suggesting the technical feasibility of harnessing marine T. suecica for simultaneous nutrients removal from wastewaters, biogas upgrading, and production of energy-rich algal biomass. This process clearly harnesses anaerobically-digested piggery effluent not only as an asset but also uses an impurity (CO₂) in biogas to produce valuable algal biomass.
Keywords	Tetraselmis suecica ; anaerobic digestion ; assets ; biogas ; biomass production ; carbohydrates ; carbon ; carbon dioxide ; lipids ; microalgae ; nitrogen ; pH ; phosphorus ; photosynthesis ; total nitrogen ; wastewater ; wastewater treatment
Language	English
Dates of publication	2021-02
Publishing place	Elsevier Ltd
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1090121-8
ISSN	0961-9534
ISSN	0961-9534
DOI	10.1016/j.biombioe.2020.105945
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