ORCID Profile
0000-0002-4486-2492
Current Organisation
University of Southern Queensland
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Environmental Engineering | Environmental Technologies | Fertilisers and Agrochemicals (Application etc.)
Publisher: Elsevier BV
Date: 11-2017
DOI: 10.1016/J.BIORTECH.2017.07.179
Abstract: This work aimed to enhance the anaerobic digestion of fat-rich dissolved air flotation (DAF) sludge through chemical, thermobaric, and thermochemical pre-treatment methods. Soluble chemical oxygen demand was enhanced from 16.3% in the control to 20.84% (thermobaric), 40.82% (chemical), and 50.7% (thermochemical). Pre-treatment altered volatile fatty acid concentration by -64% (thermobaric), 127% (chemical) and 228% (thermochemical). Early inhibition was reduced by 20% in the thermochemical group, and 100% in the thermobaric group. Specific methane production was enhanced by 3.28% (chemical), 8.32% (thermobaric), and 8.49% (thermochemical) as a result of pre-treatment. Under batch digestion, thermobaric pre-treatment demonstrated the greatest improvement in methane yield with respect to degree of pre-treatment applied. Thermobaric pre-treatment was also the most viable for implementation at slaughterhouses, with potential for heat-exchange to reduce pre-treatment cost. Further investigation into long-term impact of pre-treatments in semi-continuous digestion experiments will provide additional evaluation of appropriate pre-treatment options for high-fat slaughterhouse wastewater.
Publisher: American Society of Agricultural and Biological Engineers
Date: 2020
Publisher: MDPI AG
Date: 09-11-2020
DOI: 10.3390/APP10217947
Abstract: This work represents and reviews a compilation of investigations into improving anaerobic digestion performance of high-strength wastewater in the Australian Red Meat Processing industry. The industry produces significant quantities of organic-rich wastewater which requires treatment prior to release to the environment. Anaerobic lagoons are a cost-effective method of waste treatment where land availability is not an issue however, the high fat load in the wastewater can negatively impact the anaerobic lagoon system and result in compromised anaerobic digestion performance. This paper will discuss the importance of upstream primary pre-treatment and review a series of investigations focused on optimising digester performance and improving fat biodegradability. These studies include: 1. the effect of temperature and mixing 2. the influence of feedstock trace element composition and supplementation, and 3. the potential benefit from pre-treatments such as chemical, thermobaric, thermochemical and bio-surfactant. This paper discusses the implications of these findings for covered anaerobic lagoon operation and provides recommendations to promote optimum digester performance and future opportunities in adopting alternate anaerobic digestion technology options. Finally, the paper provides recent trends toward the use of other waste streams for co-digestion and discusses this in terms of digester optimization and technology options.
Publisher: Elsevier BV
Date: 10-2015
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 06-2019
Publisher: Wiley
Date: 07-03-2018
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 2023
DOI: 10.1016/J.JENVMAN.2022.116254
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
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.BIORTECH.2018.05.050
Abstract: In this study, anaerobic digestion of slaughterhouse wastewater with the addition of trace elements was monitored for biogas quantity, quality and process stability using CSTR digesters operated at mesophilic temperature. The determination of trace element concentrations was shown to be deficient in Fe, Ni, Co, Mn and Mo compared to recommendations given in the literature. Addition of these trace elements resulted in enhanced degradation efficiency, higher biogas production and improved process stability. Higher organic loading rates and lower hydraulic retention times were achieved in comparison to the control digesters. A critical accumulation of volatile fatty acids was observed at an organic loading rate of 1.82 g L
Publisher: American Society of Agricultural and Biological Engineers
Date: 2020
Publisher: Informa UK Limited
Date: 12-2011
Publisher: American Society of Agricultural and Biological Engineers
Date: 17-07-2016
Publisher: Elsevier BV
Date: 04-2023
Publisher: American Society of Agricultural and Biological Engineers
Date: 2019
Publisher: American Society of Agricultural and Biological Engineers
Date: 2019
Publisher: CSIRO Publishing
Date: 2021
DOI: 10.1071/AN20400
Abstract: The livestock sector is a fundamental part of the modern global economy and provides food, clothing, furnishings, and various other products. So as to ensure its resilience to changes in consumer expectations, cost of production, and environmental sustainability, the sector must shift to a circular economy model. Current strategies to recover value from wastes and low-value co-products from livestock industries yield limited value hence, new technologies are required to upgrade wastes and co-products, and generate high-value products that can feed into the livestock value chain. Anaerobic digestion can convert high organic-content waste to biogas for energy and a stable nutrient-rich digestate that can be used as fertiliser. Microbial technologies can transform wastes to produce nutritionally advanced feeds. New materials from waste can also be produced for livestock industry-specific applications. While aiming to add commercial value, the successful implementation of these technologies will also address the environmental and productivity issues that are increasingly valued by producers and consumers.
Publisher: Elsevier BV
Date: 08-2001
Publisher: American Society of Agricultural and Biological Engineers
Date: 2019
Publisher: Elsevier BV
Date: 12-2013
Publisher: Elsevier BV
Date: 05-2019
DOI: 10.1016/J.BIORTECH.2019.01.143
Abstract: Ensiling of sugarcane trash (SCT) and sugarcane stalks (SCS) was studied to assess the effects of molasses (MOL) and lactic acid bacteria (LAB) inoculant on methane potential. The experiment was run for 70 days and monitoring parameters were analyzed at days 0, 5, 15 and 70. Biochemical methane potential (BMP) tests performed with fresh and ensiled material at day 70 showed an increase in methane potential by 24.0%, 23.4%, 1.7% and 71.1% for SCS
Publisher: American Society of Agricultural and Biological Engineers
Date: 2021
Publisher: American Society of Agricultural and Biological Engineers (ASABE)
Date: 2018
DOI: 10.13031/TRANS.12342
Abstract: In Australia, recycling of paunch waste to farmland has been suggested as a cost-effective and practicable environmental option, but little is known about its agronomic value. Experimental work was undertaken to assess potential risks due to weed seed contamination, determine the agronomic response of ryegrass ( L.) to soil incorporation of paunch, and investigate short-term greenhouse gas (GHG) emissions. Five types of paunch with compost ages between 2 and 16 weeks were compared with urea (46% N) and applied at field equivalent rates of 0 (control), 150, and 300 kg ha -1 N. The risk of weed contamination from paunch applied to soil appeared to be negligible however, techniques that enable seed viability to be determined may be required to fully discard such risk. Average dry matter yield with paunch was ~30% higher than untreated grass, but ~35% lower than with urea. Dry matter yield in paunch-treated grass was between 2500 and 3250 kg ha -1 over five cuts conducted at 25-day intervals. Paunch N responses were between 1.12 and 3.25 kg DM kg -1 N depending on compost age, but lower than with urea N (~6.5 kg DM kg -1 N). Nitrogen use efficiency of paunch ranged between 3% and 20%, compared to about 35% with urea. Nitrogen fertilizer replacement value (NFRV) of paunch was highest in the 6-week-old compost (~60%) and ranged between 20% and 55% across all other organic materials. Short-term N 2 O emissions were similar (p & 0.05) with both mineral and organic amendments however, CH 4 emissions were higher (p & 0.05) from paunch compared with urea-treated soil. Overall, there appears to be potential for paunch-derived products to be used as a source of C and nutrients in crop production. Industry quality specifications for compost are available, but they need to be expanded to incorporate guidelines relevant to paunch. There is a requirement for the value proposition to industry to be determined, including reduced cost of paunch disposal via gate fees. Keywords: Byproducts, Composting, Fertilizer replacement value, Nutrient recovery, Nutrient use efficiency, Recycling of abattoir-derived waste.
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 02-2014
Publisher: Elsevier BV
Date: 08-2018
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 11-2023
Publisher: American Society of Agricultural and Biological Engineers
Date: 2018
Publisher: Informa UK Limited
Date: 24-01-2020
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 2022
DOI: 10.1016/J.WASMAN.2021.11.012
Abstract: A key environmental sustainability requirement for the treatment of organic waste via anaerobic digestion (AD) is the prevention of unwanted methane emissions in the production chain whenever possible. Identifying and quantifying these emissions has been frequently investigated, particularly in Europe. However, the challenges of climate change are also becoming vitally important in Australia. This novel study presents the results from emission measurement c aigns carried out at two biogas plants and one landfill site in Australia. An on-site approach consisting of leakage detection and emission quantification by a static chamber method was applied. Twenty-nine leakages were detected predominantly on the digesters (gastight covered anaerobic lagoons) of the biogas plants. Ten emission hot spots were found on the surface cover of a landfill site. Methane emission rates of 9.9 ± 2.3 kg h
Location: Australia
Location: Australia
Start Date: 07-2022
End Date: 07-2026
Amount: $2,062,428.00
Funder: Australian Research Council
View Funded Activity