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• We detected and quantified CH 4 emissions from Australian biogas plants. • We compared Australian and European AD technology with regard to CH 4 emissions. • We tested an instrument to screen precisely emission hot spots on landfills. 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 campaigns 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−1 (10.5 ± 2.4% CH 4) for biogas plant A, 3.0 ± 1.9 kg h−1 (8.1 ± 5.2% CH 4) for biogas plant B and 41–211 g h−1 for the two largest emission hot spots from the landfill were measured. Since not every single leakage or hot spot could be quantified separately, the stated overall emission rates had to be extrapolated. Importantly, the emission rates from the landfill should be interpreted carefully due to the limited overall area which could be practicably investigated. Leakages occurred at common components of the covered anaerobic lagoons such as the membrane fixation or concrete walls. Repairing these parts would increase the plant safety and mitigate negative environmental effects. [ABSTRACT FROM AUTHOR]

In recent decades, the adoption of smart water metering technology for water management has increased. The case for the adoption of smart water meters is mainly motivated by engineering and efficiency considerations around water conservation and related issues, for instance leak detection. At a consumer level, this can lead to improved feedback resulting in better customer control over consumption and household expenditure. The rate of adoption of smart water meters is dependent on many factors such as initial cost. The cost is expected to reduce as the technology matures and more options become available. The rate of adoption of the technology is also expected to be shaped by a variety of regulatory and social considerations. The purpose of this paper is to review the regulatory and social aspects that are likely to affect the adoption of the smart water metering technology in the future, with a focus on Australia. Instances of these aspects include privacy and health concerns, social acceptance, and communication strategies. It is expected that this paper will generate a healthy debate around the adoption of smart water meters to help the water sector to achieve a smooth transition from conventional to smart water meters. [ABSTRACT FROM AUTHOR]

The Australian Capital Territory (ACT) has legislated and aims to be net zero emissions by 2045. Such ambitious targets have implications for the contribution of hydrogen and its storage in gas distribution networks Therefore, we need to understand now the impacts on the gas distribution network of the transition to 100% hydrogen. Assessment of the viability of decarbonising the ACT gas network will be partly based on the cost of reusing the gas network for the safe and reliable distribution of hydrogen. That task requires each element of the natural gas safety management system to be evaluated. This article describes the construction of a test facility in Canberra, Australia used to identify issues raised by 100% hydrogen use in the medium pressure distribution network, consisting of nylon and polyethylene (PE) as a means of identifying measures necessary to ensure ongoing validity of the network's regulatory safety case. Evoenergy (the ACT's gas distribution company) have constructed a Test Facility, incorporating an electrolyser, a gas supply pressure reduction and mixing skid a replica gas network and a domestic installation with gas appliances. Jointly with Australian National University (ANU) and Canberra Institute of Technology (CIT) the Company has commenced a program of "bench testing", initially with 100% hydrogen to identify gaps in the safety case specifically focusing on the materials, work practices and safety systems in the ACT. The facility is designed to assess: • Materials in use including aged network materials and components • Construction and installation techniques both greenfield and live gas work • Purging and filling techniques • Leak detection both underground and above ground • Emergency response and make safe techniques • Issues associated with use of hydrogen in light commercial and domestic appliances. To educate and train: • Technicians and gas fitters on infrastructure installation and management • Emergency response services on responding to hydrogen related emergencies in a network environment; and • manage public perceptions of hydrogen in a network environment. Australia has an enviable safety record for the safe and reliable transport, distribution and use of natural gas. The ACT natural gas network owned and operated by Evoenergy is one of the newest in Australia and has leveraged off the best materials and practices in Australia to build its network. The paper addresses major safety issues relating to the production/storage, distribution and consumer end use of hydrogen injected into existing gas distribution networks. The analysis is guided by the Safety Management System. The Hydrogen Testing Facility described in the paper provide tools for evaluation of hydrogen safety matters in the ACT and Australia-wide. Testing to date has confirmed that polyethylene and nylon pipe and their respective jointing techniques can contain 100% hydrogen at pressures used for the distribution of natural gas. Testing has also confirmed that current installation work practices on polyethylene and nylon pipe and joints are suitable for hydrogen service. This finding is subject to variation attributable to staff training and skill levels and further testing has been programmed as outlined in this paper. Testing of gas isolation by clamping and simulated repair on the hydrogen network has established that standard natural gas isolation techniques work with 100% hydrogen at natural gas pressures. • World first leak testing of hydrogen impact on nylon distribution pipe. • Leak testing of hydrogen on nylon and polyethylene pipe under real world conditions. • Testing of existing gas distribution work practices for safe use with hydrogen. • Testing each element of a gas Safety Management System for safe use with hydrogen. [ABSTRACT FROM AUTHOR]

It is critical for landfilling facilities to follow proper waste handling and management practices. These include the use of suitable lining systems for waste containment, and the implementation of efficient leakage monitoring and detection systems. In this paper, an attempt has been made to present the current state of landfilling in Australia with a focus on the lining practices and leak detection methods. An extensive study was conducted involving different private and public waste handling and management facilities in all the states and territories of Australia. Based on the survey and the information available in the public domain, it was observed that different landfill sites practiced non-uniform set of directives for waste classification, siting, design, operation and rehabilitation. Majority of the facilities were found to be publicly owned. The use of groundwater monitoring wells for leakage detection was more prevalent than other leak detection methods. Further, a new method of leak detection by the simulation of landfill lining system, which is being developed and investigated in our research, is also presented. This study is particularly useful in generating awareness about the state of landfilling and will help various environmental protection agencies in making informed decisions for the development of rules and regulations to govern landfills. The new leak detection method as developed in our research can find applications in the development of monitoring systems for landfill liners, subbase contamination detection, and development of sensors. [ABSTRACT FROM AUTHOR]