Waste Output Research Articles

Studying and Promoting Knowledge on Sustainable Agricultural Waste Management: A Case Study in Banhan Upper Secondary School and Surrounding Schools in Hongsa District, Xayaboury Province, Lao PDR

The investigation took place at Banhan upper secondary school in the Hongsa district of Xayaboury Province. It spanned a duration of 12 months and involved providing TOT training on managing reused and recycled waste to 35 students and teachers at the school. Additionally, 48 trash bins were supplied and set up across 7 schools and 3 related offices. A school received a trash bin to collect recyclable waste that was set up for the students' practice. The findings presented that 94.71% with understanding index 1.24 SD of the students and teachers were displayed a good understanding and comprehended the project's activities, with 83.47% with sastisfacting index 0.77 SD expressing satisfaction. Only a small fraction, less than 5.29%, struggled with waste management and required further enhancement of their knowledge and skills. The waste collected from 10 locations comprising schools and offices underwent 8 rounds of 2 months collection. In total, 1,121.2 Kg of waste was disposed of, averaging 280.3 Kg per mounth. The waste output in schools increased due to the growing number of students and educators. Banhan upper secondary school accounted for the highest waste quantity output at 49.7 Kg/month (17.73%), followed by Monk lower secondary school at 36.2 Kg/month (12.91%), and Nasan primary school at 33.8 Kg/month (12.06%) and the least amount of waste was generated by the district office of Education and Sports only 13.7 Kg/month (4.89%) representively. The quantity of 4 categories of waste revealed that the burnable waste promoted largest quantity 149.9 Kg/month (4.99 Kg/day), connected by compost waste 71.4 Kg/month (2.38 Kg/day), Reusable waste 60 Kg/month (2 Kg/day) and harmful waste 2 Kg/month (0.07 Kg/day). Waste in a day per person was calculated from populalation of the institution in 8h a day (working day), result shown that district office of Natural Resource and Enviroment has a high significant in quantity of waste 0.0351 Kg (35.1 g)/person/day. Then, Phonchan primary school 0.0221 Kg (22.1 g)/person/day and Nasan primary School 0.0205 Kg (20.5g)/person/day, the lowest quantity of waste was Hongsa upper secondary school 0.0012 Kg (1.2 g)/person/day. Nevertheless, the primary emphasis of this research was on the quantities of waste can be reuse, aiming to enhance awareness among academic staff, teachers, and students. The goal is to ensure comprehension, discourage indiscriminate disposal of garbage, and promote waste reduction through practices such as reuse and recycling.

Application of Biofloc Techznology as an Environmentally Friendly Solution to Increase the Productivity of Freshwater Fish Cultivation

This study explores the application of Biofloc Technology (BFT) as an environmentally friendly solution to increase the productivity of freshwater fish cultivation. Using a qualitative research approach based on a comprehensive literature review and library research, the paper examines the effectiveness of Biofloc in improving water quality, reducing feed costs, and enhancing fish growth rates. BFT promotes the growth of beneficial microbial communities that convert organic waste into protein-rich bioflocs, which serve as a supplementary feed for fish. This technology minimizes water exchange, conserves resources, and mitigates environmental pollution in aquaculture systems. The study highlights various successful implementations of Biofloc in freshwater aquaculture, noting significant improvements in production efficiency and sustainability compared to traditional farming methods. Moreover, the paper discusses the economic and environmental benefits of adopting Biofloc Technology, including reduced dependency on high-cost commercial feed and lower environmental impact due to decreased water usage and waste output. The findings suggest that Biofloc Technology is a promising innovation for sustainable aquaculture, providing both ecological and economic advantages. This research provides insights for policymakers, fish farmers, and aquaculture industry stakeholders interested in adopting eco-friendly practices to enhance productivity while protecting aquatic ecosystems

Environmentally Friendly Biological Activated Carbon Derived from Sugarcane Waste as a Promising Carbon Source for Efficient and Robust Rechargeable Zinc–Air Battery

China is one of the largest sugarcane industrial countries in the world, and the annual output of bagasse waste is abundant. Classical incineration, landfill, and other treatment methods are inefficient and seriously harmful to the environment, so it is urgent to develop a new comprehensive utilization of agricultural waste. In this work, the sugarcane waste residue is converted to biological activated carbon (BAC) through a simple pre-carbonization and KOH activation process, which is then mixed with perovskite oxide BaCo0.5Fe0.5O3−δ (BCF) to form BAC/BCF composite air electrode. BAC/BCF assembled rechargeable zinc–air battery (ZAB) exhibits a relatively good output maximum power density of 96 mW·cm−2 and considerable long-term charge–discharge cycle stability over 250 h operation. These results indicate that the BAC derived from sugarcane waste is a promising potential carbon material candidate for ZAB application, which can realize the high-value utilization of agricultural waste in the field of efficient and durable energy storage and conversion devices.

Environmental impacts of the filamentous fungi Paecilomyces variotii (PEKILO®) as a novel protein source in feeds for Atlantic salmon (Salmo salar)

The present study investigated environmental impacts associated with greenhouse gas (GHG) emission, economic Fish in Fish out ratio (eFIFO), waste outputs, and food-feed competition of feeding diets containing the filamentous fungus Paecilomyces variotii (PEKILO®) to Atlantic salmon (Salmo salar) pre-smolts. To achieve this, a feeding trial was conducted using four experimental diets. The control diet was based on fishmeal, soy protein concentrate, and wheat gluten meal. Diets 1, 2, and 3 were formulated so that P. variotii replaced 5, 10, and 20 % of the crude protein (CP) content of the control diet originating mainly from fishmeal, soy protein concentrate, and wheat gluten meal. Dietary inclusion of P. variotii affected simulated environmental indices such as GHG emission (P < 0.001); this index was P. variotii-dose-dependent, as illustrated by negative linear models (P < 0.001, adjusted R-squared = 0.96). Dietary inclusion of P. variotii was negatively correlated with eFIFO (P < 0.001, adjusted R-squared = 0.82). Dietary inclusion of P. variotii reduced food-competition feedstuff (FCF) in the diets (P < 0.001), as well as the amount of FCF to produce one kg of Atlantic salmon (P < 0.001). Relative to the control diet, solid nitrogen waste output, expressed as g kg−1 fish produced, was increased (P < 0.0001) in fish fed Diet 3. Conversely, linear decreases in solid phosphorous, magnesium and potassium (P < 0.0001) wastes expressed as g kg−1 fish produced were associated with increasing dietary inclusion of P. variotii. Likewise, linear decreases in dissolved nitrogen, magnesium, and potassium (P < 0.0001) wastes were observed with increasing replacement of the CP content of the control diet with P. variotii. Based on this assessment, P. variotii is a relevant alternative protein source with a low environmental footprint for use in Atlantic salmon feeds. Future novel feeds for Atlantic salmon should expand the use of alternative protein- and lipid-rich materials with a low ecological footprint that are produced according to a circular bioeconomy principle and utilize non-food-competing feedstuff (NFCF) such as P. variotii to move the industry toward sustainability.

An urban agricultural block construction method based on low-carbon concepts: A case study of the Beijing-Tianjin area in China

With the ongoing progress of urbanization, various issues such as resource scarcity, climate change, and carbon emissions overload have gradually emerged. Urban agriculture (UA) is recognized as a pivotal strategy to promote sustainable urban development. In this context, the study proposes a spatial scale hierarchy, encompassing “single building - building cluster - urban block," to formulate spatial strategies for the theoretical model of urban agricultural blocks. The theoretical model integrates production spaces, production methods, and spatial systems based on relevant design principles and the needs of residents. Nankai District's Qingfeng Road East Block in Tianjin is used as the site for applying and simulating the theoretical model. The results of the study show that UA in a 500m × 500m block can ideally eliminate the need for external food inputs by 100% for starchy vegetables, legumes and fruits, and meat/poultry, while achieving a 254.73% self-sufficiency rate for fungi. Additionally, it can reduce energy inputs by 28.33%, water inputs by 38.13%, and completely eliminate waste output for 8754 people. Carbon emission analysis indicates that the urban agricultural block can reduce approximately 2250.01t CO2 emissions from buildings and waste, with greater carbon-neutral potential in transportation and agriculture, forestry, and other land uses (AFOLU). This is significant for tackling various urban challenges and enhancing future development.

DEVELOPMENT OF EFFICIENT AND ENVIRONMENTALLY FRIENDLY SEPTIC TANKS

In many communities in Indonesia, there are still many areas where their homes do not have a toilet (water closet) that meets hygiene and health requirements. This is caused by many factors, including because there are still many people who live below the poverty line, both economically poor and poor in knowledge (human resources). Procurement of toilets (water closets) which also include a septic tank system with a minimum output that is environmentally friendly and of course cost efficient is very necessary to improve public health. Based on the description above, this research was created in order to provide procurement and development of efficient and environmentally friendly septic tanks. This research is very necessary because of the discovery of an efficient alternative material by using used drums which can be used as septic tanks in Lampung, but it has not deepened the issue of waste output that is safe for the environment. This research was carried out using a constructivist qualitative method with assistance from DIGILIB Digital Library &amp; OPAC UB sources. is at Brawijaya University Malang, where the author is registered as a student in the environmental science doctoral program at Brawijaya University Malang.

Simultaneous precipitation removal of fluoride ion and chloride ion from smelting waste acid using renewable remover

Purification and reuse is a potential method of smelting waste acid disposal. High concentrations of fluoride and chloride in waste acid are harmful impurity and must be removed. Previous studies have shown that fluoride removal with rare earth and chloride removal with bismuth have similar cyclic process of "precipitation removal-agent regeneration" and similar reaction conditions. In this paper, a method of simultaneous precipitation removal of F− and Cl− from waste acid using La(OH)3 and Bi2O3 as a mixed remover was proposed, and the mixed remover is regenerated by sodium hydroxide solution for the recycling of the remover. Thermodynamic analysis of La3+-Bi3+-F−-Cl−-H2O system verified the feasibility of simultaneous removal. The experimental results showed that under the optimum reaction conditions, the removal efficiencies of F− and Cl− were 93.67 % and 96.47 %, respectively, and the concentrations of F− and Cl− in the solution after removal were 66.70 mg/L and 71.10 mg/L, respectively. Under the optimum conditions, the regeneration efficiencies of La(OH)3 and Bi2O3 were 96.80 % and 96.95 %, respectively. The proposed process has the advantages of no waste output, short process, and low energy consumption and provides an environmentally friendly method of removing fluoride and chloride from waste acid.

Evaluating energy generation potential from municipal solid waste in an open dumping site of Khulna

The expanding global population, waste output, land scarcity, and environmental deterioration make waste-to-energy (WtE) technology a feasible option for managing MSW. This study explores the economic benefits of WtE in the Rajbandh open dumpsite in Khulna and the potential of generating energy from MSW. The electricity generation potential under alternative scenarios namely scenario 2 (landfill gas to electricity (LFGTE)), scenario 3 (mass-burn incineration), scenario 4 (hybrid LFGTE, mechanical–biological treated (MBT) anaerobic digestion (AD) and incineration), and scenario 5 (hybrid AD and refuse-derived fuel (RDF) incineration) is based on projected waste generation over the next 20 years, taking population growth into account. These four options are compared to Business as Usual (BAU). Scenario 3 has the highest electricity generation capacity at 207799.73 MWh/year, followed by hybrid RDF-incineration/MBT-AD (scenario 5), LFGTE, however, lowest generation at 30683.07 MWh/year. Net Present Value (NPV), Levelized Cost of Electricity (LCOE), and Payback Period define each scenario’s economic feasibility. Due to its greatest NPV of approximately 41.378 million USD, Scenario 3 is the most economically beneficial. Sensitivity analysis has been done selecting some sensitive parameters to evaluate the robustness of the output. Waste reduction model (WARM) estimates greenhouse gas (GHG) emissions and energy use for each scenario. However, scenario 3 has the lowest GHG emissions and energy use. In addition to reducing GHG emissions and energy usage, recycling waste increased NPV and economic benefits. This analysis reveals that scenario 3 is the best way to generate power, provide economic benefits, and reduce energy consumption for ecologically friendly waste management in Khulna City.

Optical microscopy of ceramic materials based on fly ash from thermal power plants

The data on the annual release of ash and slag waste as a result of the operation of thermal power plants (TPP) in Siberia and the Far East of the Russian Federation are presented. The main reasons for the insignificant use of ash in the construction industry (about 5-8% of the total waste output) and the problems hindering its use for the production of ceramic wall materials are considered. A brief description of the composition and properties of the raw materials used in this work for the manufacture of ceramic wall materials is given. The compositions of the developed fly ash-based charges and the method of manufacturing ceramic samples with a matrix structure are given. The results of the study of the structure of ceramic materials by optical microscopy are presented. It is established that during the firing process, a matrix (dispersion medium) is formed from the fusible shell of aggregated complexes, and granules from fly ash are transformed into cores (dispersed phase) of a ceramic matrix composite. It was revealed that the kernels have an oval shape due to the deformation of the granules during pressing. Clusters are formed in the nuclei, consisting of a large number of small crystalline grains connected by an amorphous substance and edged with thin chains of pores. It is shown that the developed pore space inside the cores is mainly represented by frost-proof and reserve pores, which ensures high frost resistance of ceramic samples based on fly ash.

The way out for urban household solid waste classification in China: From the perspective of multi-agent based behavior simulation

Rapid industrialization and urbanization drive China's massive urban household solid waste (HSW) generation. Classification and resource recycling of HSW is an effective way to address the “garbage-sieged city” dilemma and promote “urban mineral resources” exploitation. Despite efforts since 2000, HSW sorting and recycling remain at 30%. This study develops a multi-agent based behavior simulation model for HSW classification and recycling, incorporating the interactions and decision-making of key agents, including residents, enterprises, and the government. Taking Suzhou, China as a case study, field surveys were conducted, and behavioral decision-making functions were constructed to simulate micro-behavioral responses and macro-system evolution under different policy incentives, and to predict the implementation effect of domestic waste management approaches, provides the basis for decision-making. The results demonstrate that a combination of waste metering charges, recycling subsidies, and enhanced education program can effectively regulate agent behavior and optimize the system. One year after the implementation of the simulation, the number of “unclassification” residents has dropped from 1.85 million to 250,000 decreased by 86%; the number of “classification deposition” residents has declined from 1.28 million to 1.08 million, reduced by 16%; the number of “selling after classification” residents has risen from 1.05 million to 2.81 million, increased by 63%; the daily waste output per capita has decreased from 1.21 kg to 1.04 kg, reduced by 14%; the recovery rate of resources has been raised from 33.4% to 66.5%. The implementation effects of other policy scenarios are ranked as follows: the metering charge > the recycling subsides > the enhanced education program. The findings provide a basis for decision-making in HSW management. Concerning the metering charge and the recycling subsidies, they can benefit positive interactions encouraged by such economic stimulus. At the same time, it is suggested to strengthen classification and recycling infrastructure, and push forward the integration of HSW classification recycling.

An Exploration of Food Sustainability Practices in the Food Industry across Europe

Sustainability is becoming essential and actively debated in the food sector, influencing companies and stakeholders globally. Sustainability practices have been developed and integrated into food industry actions and policies to meet present needs without compromising future needs. The aim of this study was to explore the current sustainability practices across the food industry in Europe and how initiatives are developed, implemented and evaluated to achieve food sustainability targets. This study formed part of a larger European project (2022-1-IE01-KA220-VET-000087508 Digitalisation of Sustainable Health Education). In-depth semi-structured interviews were conducted with 21 food industry employees with expertise in sustainability across Ireland, Poland, Lithuania, and Cyprus. Interviews were transcribed and thematically analysed. Three themes were identified: sustainable practices challenges, facilitators of green practice, and thinking to the future, Complying with the Science-Based Targets initiative, and setting emissions targets such net zero by 2050 and reducing waste output, drove sustainable activities. Participants identified barriers to initiative development and implementation including cost, monitoring time, product quality, and employee engagement. Employee and stakeholder understanding were crucial to sustainability initiative success. Gaps in research were identified as the proliferation of environmental labels and greater company collaboration to share sustainability data. A key consideration highlighted in discussions was the importance of collaboration and education for raising awareness and strengthening the implementation and long-term maintenance of food sustainability practices within industry. Greater collaboration between large food companies to share raw sustainability metric data could strengthen initiative outcomes and raise greater awareness among stakeholders, bridging the knowledge gap with producers or stakeholders who operate on a smaller scale.

Exploring the Potential of Weld Slag as Aggregate Replacement in Concrete for Sustainable Construction: A Review Paper

Concrete is the most globally used material in the construction industry, with over ten billion tons produced annually, and its aggregates making 70 to 80% of its quantity. The aggregates production leads the natural sources of these aggregates to deplete in a high rate and with a significant carbon footprint. Consequently, industries are generating waste output in a large quantity which is posing problems to the environment and leading to economic challenges. This review explores the potential of using industrial waste such as weld slags, steel slags, and glass powder as substitutes to traditional concrete aggregates. The integration of these wastes solves the problems of waste disposal, resource depletion and environmental pollution. The review is to also to encourage the reuse, recycling and reduction of waste production to reduce pollution. This practice will help ensure resource conservation, environmental protection and enhanced sustainability. Furthermore it underscores the importance of further research on the durability and practical applications of concrete containing industrial slags such as steel slags, weld slags, glass powder etc. to establish effective and sustainable construction practices.

Confronting the United Nations’ Pro-growth Agenda

In this article, we enjoin the United Nations (UN) to forge a path out of our plight of multiple environmental and social crises. With other analysts, we identify ‘overshoot’ – the state in which humanity has substantially outpaced Earth’s capacity to regenerate its natural systems and to absorb our waste output – as the root cause of the existential threats we face. This dangerous condition demands rethinking our relationship with Earth and embarking on scaling down the human enterprise within policy frameworks of equity and rights. We argue that when the UN first articulated its international unity and prosperity mission, it did so within a ‘growth’ paradigm that treats Earth and its nonhuman inhabitants as mere resources at humanity’s disposal. The 1994 Cairo Conference on Population and Development reinforced this agenda, with its sharp turn away from the earlier emphasis on population concerns and their link to environmental protection. Today, it is clear that the UN’s foundational goals of peace, human rights and sustainability flounder within a growth-driven framework of human exceptionalism and nature domination. To correct course and reverse our advanced state of ecological overshoot we urge the UN to lead in contracting the large-scale variables of the human enterprise – population, economy, technosphere – and to resist co-optation by political, ideological and special interest pressures that would derail this mandate.

Optimisation of the Circular Economy Based on the Resource Circulation Equation

The lack of effective evaluation methods and implementation guidelines has led to frequent obstacles in the process of circular economy in enterprises. The efficiency equation for resource circulation can effectively evaluate the efficiency of an enterprise’s circular economy resource circulation from three perspectives: input, circulation, and output. Additionally, it delves into each link to identify weak points, offering guidance for optimising the enterprise’s circular economy. Utilising a value flow analysis within the context of a circular economy, this paper evaluates circular economy efficiency using a resource circulation efficiency equation. It conducts factor analysis across three dimensions: resource input, resource circulation, and waste output. This analysis aims to evaluate the corresponding resource productivity, added value output rate, and environmental efficiency. Factor decomposition techniques were then employed to identify the underlying factors contributing to poor circular economy outcomes. Furthermore, based on the relationships among three resource circulation indicators, this paper forecasts the potential advantages of integrating circular economy improvement measures and proposes practical optimisation approaches. The enhanced resource circulation efficiency resulting from the proposed optimisation approaches was validated through a case study with an aluminium company.

Improving urban waste management: A comprehensive study on household waste generation and spatial patterns in the Grand Guayaquil Metropolitan Area.

This study tackles the growing global concern about municipal waste management, particularly in cities like the Grand Guayaquil Metropolitan Area (GGA). Through realistic field studies on in situ household waste generation and geographic information system (GIS) tools, this work offers a framework to predict the quantities and types of recyclable household waste for any metropolitan area in Latin America. Over 4 weeks, students collected, sorted and weighed recyclable waste types, including plastic, paper, metal, glass and fabric, from 776 sampled household of the GGA. ArcGIS survey tool identified household locations and allowed to survey different socio-demographic features. With the help of ArcGIS interpolation method, the total household waste generation for GGA was predicted, and the classification of the different types of recyclable waste was also spatially distributed for the study area. The report identified notable trends in plastic waste, specifically polyethylene terephthalate waste's steady prevalence and 42% growth rate, emphasizing the importance of enhanced recycling techniques. Spatial density maps showed a heterogeneous waste distribution across the GGA, emphasizing locations with higher waste output. This study demonstrates that improving recyclable waste collection can be accomplished with a moderately cheap expenditure by collaborating with academia to overcome knowledge gaps. This strategy provides opportunities to mitigate the environmental impacts of poor waste management.

Silicon powder production from organosilicon waste by a beneficiation-metallurgy combination process

A large amount of waste contact is produced in the preparation of organosilicon monomer. The current researches are mainly focused on copper extraction, with little attention paid to silicon. Moreover, the large accumulation of decoppered residue from organosilicon waste causes environmental pollution and resource waste. In this study, a novel beneficiation-metallurgy combination process was developed for the extraction of silicon from decoppered residue, which was defined as high gradient magnetic separation followed by roasting and acid leaching. The results showed that high gradient magnetic separation was effective in separating silicon from metallic impurities. Under the optimum conditions, the removal efficiencies of metallic impurities are more than 80 %. Fe content in the non-magnetic product can be further reduced to 0.82 % by cleaning. The non-magnetic products obtained by a roughing-cleaning process are subjected to roasting and acid leaching experiments. Under the optimum conditions, the removal efficiency of C and O can reach 94.26 % and 96.32 %, respectively. The final silicon powder product meets the standard of "YS/T1109–2016", which can be reused in the production of methylchlorosilane. This process is suitable for large-scale treatment of decoppered residue and is simple enough to help solve the problem of large-scale output of organosilicon waste.

Analisis Penyisihan Kandungan Amonia dengan Stripper di Pabrik Ammonia

Ammonia industrial waste treatment is part of the final process in the industry. Wastewater containing high ammonia content needs to be treated using a stripping process. This study to analysis the stripping process for ammonia waste treatment in the industry to obtain appropriate operating conditions and meet the wastewater standards issued by the Minister of the Environment. Data obtained during 10 days of operation were compared with the standards and analyzed for column efficiency. The results of the analysis showed that the waste output with a concentration of 13.9 - 49 ppm, a pH range of 8.7 - 9 and most of the waste discharge had met the standards, namely a maximum of 50 ppm and pH 6-9. The best gas-liquid ratio at the stripper inlet is 0.25 V / V and pressure has no significant effect on stripper efficiency.

2G-lactic acid from olive oil supply chain waste: olive leaves upcycling via Lactobacillus casei fermentation

The transition towards a sustainable model, particularly the circular economy, emphasizes the importance of redefining waste as a valuable resource, paving the way for innovative upcycling strategies. The olive oil industry, with its significant output of agricultural waste, offers a promising avenue for high-value biomass conversion into useful products through microbial processes. This study focuses on exploring new, high-value applications for olive leaves waste, utilizing a biotechnological approach with Lactobacillus casei for the production of second-generation lactic acid. Contrary to initial expectations, the inherent high polyphenol content and low fermentable glucose levels in olive leaves posed challenges for fermentation. Addressing this, an enzymatic hydrolysis step, following a preliminary extraction process, was implemented to increase glucose availability. Subsequent small-scale fermentation tests were conducted with and without nutrient supplements, identifying the medium that yielded the highest lactic acid production for scale-up. The scaled-up batch fermentation process achieved an enhanced conversion rate (83.58%) and specific productivity (0.26 g/L·h). This research confirms the feasibility of repurposing olive waste leaves for the production of lactic acid, contributing to the advancement of a greener economy through the valorization of agricultural waste.Key points• Olive leaves slurry as it did not allow L. casei to ferment.• High concentrations of polyphenols inhibit fermentation of L. casei.• Enzymatic hydrolysis combined to organosolv extraction is the best pretreatment for lactic acid production starting from leaves and olive pruning waste.Graphical

Sustainable Twist – Towards Highly Atom Efficient Grignard Processes

AbstractCopper salts, which are widely applied in chemical processes, are highly toxic for aquatic life with devastating and long‐lasting effects. The most sustainable measure to prevent negative impact on surface water bodies is the elimination of copper from chemical processes. In Grignard reactions, acyl chlorides are widely used in combination with copper(I) chloride to introduce acyl substituents to aromatic compounds. We demonstrate that carboxylic acid anhydrides are a competent and highly selective alternative to acyl chlorides when used in the absence of copper(I) catalysts. An integrated value stream cycle allows for recycling of the carboxylate salt byproducts by reaction with ketene, thereby reducing the waste output to almost zero. This proposed process can therefore contribute to minimizing both chemical waste and heavy metal input into water bodies.

Analysis of Waste Management and Greenhouse Gas Emission Reduction (Case Study: Adiwiyata School SMPN 18 Surabaya and Non-Adiwiyata School SMPN 31 Surabaya)

In Surabaya, a city program named "Perilaku dan Berbudaya Lingkungan Hidup di Sekolah" (PBLHS), or Environmental Behavior and Culture in Schools, specifically targets Adiwiyata schools to promote sustainable practices. However, not all schools participate in this initiative. Non-Adiwiyata schools typically send their waste to the Final Waste Processing Site (TPA), which exacerbates the load on these facilities and contributes to increased greenhouse gas (GHG) emissions. This study aims to compare waste management and GHG reduction efforts between Adiwiyata and non-Adiwiyata schools in Surabaya. We conducted sampling at one Adiwiyata school and one non-Adiwiyata school, analyzing waste generation and management strategies using the SNI 19-3964-1994 method. Our findings reveal that Adiwiyata schools generate less waste, with an average of 0.0103 kg/person/day, compared to 0.0155 kg/person/day at non-Adiwiyata schools. Furthermore, the organic waste composition was significantly lower in Adiwiyata schools at 2.08%, versus 33% in non-Adiwiyata schools. Methane (CH4) emissions from Adiwiyata schools were also lower, measuring 0.123 Gg/year, as opposed to 0.405 Gg/year from non-Adiwiyata schools. These disparities in waste output, organic waste composition, and GHG emissions are significantly influenced by the environmental knowledge, attitudes, and practices within the school communities.