Clean electricity is generated by the anaerobic digestion of biomass waste. The environmental impacts of various biomass waste feedstocks vary, while co-digestion has been reported to improve anaerobic digestion performance. A consequential life-cycle assessment (LCA) and techno-economic analysis (TEA) are carried out for cow manure waste management for a cow farm. Three scenarios are considered in this study: (S1) mono-digestion of cow manure, (S2) co-digestion of cow manure and maize silage, and (S3) co-digestion of cow manure with cow feed waste, sewage sludge, and returned dairy products. The LCA aims to quantify the environmental impact of each MWh of electricity generated, assuming the plant is located in Malaysia, using OpenLCA software. The TEA economic parameters are quantified and compared between the three scenarios. Net present value (NPV), Internal Return Rate (IRR), and Return of Investment (ROI) are examined. Among the three scenarios, S2 with maize cultivation has a higher environmental impact due to its higher energy requirements. With the integration of closed digestate storage and renewable energy-powered electricity, S3 has the best environmental performance in global warming, eutrophication and acidification. S3 is found to be most economically viable, with MYR 1.28 million NPV, 14% IRR, and 15% ROI, and a Payback Period of 6.56 years with an OPEX of MYR 3491.82/MWh.

Considering the importance of the 11th Sustainable Development Goal on sustainable cities and communities and the New Urban Agenda, it is imperative to address one of today's crucial urban planning challenges, which concerns overexploitation, mismanagement, and quality issues related to public parks and state-owned public open space (POS). Selecting an appropriate methodological framework to formulate a solution to cope with the encountered challenges is necessary; however, finding a suitable one is difficult as there is a lack of research, particularly on the step-by-step development of a conceptual countermeasure (solution). Against this background, we adopted the revised design science research (DSR) framework and its procedural methodology to formulate a conceptual solution, represented as an artifact, within the institutional-social-ecological context of Sabah, Malaysia. The data obtained for the development and validation of the solution were secondary, based on a review via content analysis of prior studies. The proposed conceptual artifact (self-governing collective action) based on the root causes (i.e. property rights and transaction costs issues) from the 'why' analysis was then validated via the institutional analysis and development (IAD) framework using its social- ecological system (SES) criteria. The main contribution of this study is to showcase the application and relevancy of the DSR framework for urban and environmental planning research through a problem-solution analysis by demonstrating the process of how the artifact was systematically constructed, validated and standardised. It was found that the proposed conceptual solution can be considered valid and appropriate to address the local governance issues of POS.