To depict detailed sustainability efforts that have been implemented in campus environments, research was conducted at the Universitas Diponegoro (UNDIP), a leading green campus in Indonesia. The aim of the current study was to explore how sustainable development has been conducted by UNDIP and to identify factors that may indicate the existence of sustainability activity in higher-education institutions (HEIs). Factors affecting sustainability implementation in HEIs were derived using bibliometric analysis. Information on the implemented strategies to maintain the sustainability of HEIs was obtained via a closed questionnaire to 40 relevant experts, and analyzed using strengths, weaknesses, opportunities, and threats (SWOT) analysis, and quantitative strategic-planning matrix (QSPM) analysis. Institutional commitment to sustainability and guidance to implement sustainability in HEIs were found to have the highest scores with regard to internal and external factors. The respondents selected more aggressive strategies for the enhancement of sustainability implementation at UNDIP. Fostering external collaboration should be a priority for UNDIP since this can provide mutual benefits and significant improvement towards achieving Sustainable Development Goals (SDGs). The current study provides a robust self-assessment method for selecting appropriate strategies to maintain HEI sustainability.

Effective solid waste management strategies are recognized as efforts to achieve campus sustainability. The university campus is currently considered the center of various activities involving students, lecturers, staff, and other parties contributing to the consumption pattern of energy, water, and other resources. This study aims to estimate the quantity and compositions of waste generated on the Universitas Diponegoro (UNDIP) campus, identify the causes of waste generation, evaluate the relationships between variables through statistical analysis, and recommend possible strategies to reduce solid waste generation. The results show that the simultaneous contribution of the student-gender ratio, student awareness level, administrative staff background, and green space amounted to 67.7% of the waste generation at UNDIP. Therefore, these four factors need to be a concern for campus authorities in their efforts to handle campus waste. Student awareness in particular was determined to be the only factor that significantly affects solid waste generation. UNDIP may implement proper environmental education through sustainability courses in each faculty to reduce solid waste in higher education institutions since it has the most significant impact. Outcomes of this study could be used as a reference to develop sustainable campus strategies, recycling plans, and comprehensive waste management in higher education.

This study focuses on quantifying the carbon footprint generated by non-academic activities at Diponegoro University, Indonesia. The carbon footprint study at Diponegoro University divides into three scopes, which are emissions from sources that are owned or controlled directly by the university, indirect emissions from electricity consumption, and other indirect emissions. Scope one covers clean water treatment, scope two includes electricity usage, while scope three involves wastewater and waste disposal in the campus area as a result of non-academic activities. The calculated emissions include CO2, CH4 and N2O expressed in TonCO2-eq. The carbon footprint resulting from non-academic activities at Undip is 13, 945.55 TonCO2-eq. The most significant carbon footprint contributors comes from electricity activities with a total carbon footprint of 13, 857.798 TonCO2-eq, followed by wastewater and water supply activities.

Biogas technology is an alternative solution to the energy crisis issue in Indonesia. This study focuses on determining the optimum value of grind size variations in biogas production using the Liquid Anaerobic Digestion (L-AD) from rice husk waste. It is consists of the preparation stage, total solids calculation, the operation phase, and results analysis. The rice husk is collected from Rowosari village, and it has been pre-treated by 6% NaOH of chemical pre-treatment. The physical treatment uses numerous grind sizes, including un-grinded rice husk as control, and the 10 mesh, 18 mesh, 35 mesh, 60 mesh of rice husk as an observed variable. All variables are duplicate into 12 reactors, and the biogas production is observed by collecting gas volume in each reactor for 60 days. The calculated biogas is expressed by ml/grTS. The result shows that the grind size of 10 mesh, 18 mesh, 35 mesh, and 60 mesh rice husk produces a total biogas rate of 54.95, 44.86, 58.13, and 72.14 ml/grTS respectively. The rice husk control produces 9.67 ml/gr TS as the lowest rate of biogas production compared to the others, while the 60 mesh rice husk becomes the highest biogas production rate.

Pertumbuhan mikroalga Botryococcus braunii Kutzing dipengaruhi oleh faktor lingkungan berupa salinitas, suhu, pH, oksigen terlarut (DO), intensitas cahaya dan nutrisi pada media kultivasi. Penelitian ini bertujuan untuk mengkaji pengaruh salinitas dan limbah cair tahu terhadap pertumbuhan mikroalga B. braunii. Perlakuan yang dilakukan dalam penelitian ini yaitu konsentrasi limbah cair tahu 10% dengan salinitas 15‰ (L10S15); limbah cair tahu 10% dengan salinitas 20‰ (L10S20); limbah cair tahu 10% dengan salinitas 25‰ (L10S25); limbah cair tahu 20% dengan salinitas 15‰ (L20S15); limbah cair tahu 20% dengan salinitas 20‰ (L20S20); limbah cair tahu 20% dengan salinitas 25‰ (L20S25); limbah cair tahu 30% dengan salinitas 15‰ (L30S15); limbah cair tahu 30% dengan salinitas 20‰ (L30S20); dan limbah cair tahu 30% dengan salinitas 25‰ (L30S25). Pengamatan yang dilakukan meliputi kepadatan sel dan faktor lingkungan berupa salinitas, suhu, pH, oksigen terlarut, serta kadar N dan P total. Data yang diperoleh diolah menggunakan metode analisis sidik ragam (ANOVA) yang dilanjutkan dengan uji Duncan. Hasil penelitian menunjukkan kepadatan sel tertinggi didapatkan pada perlakuan L10S25 dengan rata-rata kepadatan sel 313x104sel/ml. Secara umum, semakin tinggi limbah cair tahu yang diberikan maka kepadatan sel mikroalga akan semakin rendah.