Waste Sampling Research Articles

Comparative Study of Waste Management and Sampling Practices in Latvia and Estonia

Abstract The study focuses on waste management and sampling practices carried out in two large Baltic cities: Riga (Latvia) and Tartu (Estonia). Even though waste collection schemes are not at the same centralisation level in the two municipalities, certain similarities can be observed in waste collection, management and sampling processes. Governed by provisions of Council Directive 1999/31/EC of 26 April 1999 on the landfill of waste, general national waste treatment legislation, and the national waste management plans, waste management practices in Latvia and Estonia are moving towards minimalisation of waste landfilling and maximalisation of waste inclusion into various recycling practices (use in waste biodegradation cells, bioreactors, different waste recycling facilities, in developing modern waste management supporting infrastructure, etc.). Therefore, waste management in two countries can be partly characterised as a vital element of emerging circular economy activities aimed at minimising landfill deposition of waste, hence, a more effective and permanent approach to sustainable waste management problems, on the one hand, and maximising the diversified use of waste in different branches of economy, hence, larger economic and social benefits.

Solid waste characterization in the slum areas of Bagmati River—A case of Kathmandu, Nepal

Solid waste management (SWM) is a challenging environmental issue globally, with developing nations experiencing considerable difficulties in its efficient and effective implementation. Urban slum areas within these regions, particularly, have been reported to face unique challenges in SWM due to a combination of factors, including the low socio-economic status of residents, high population density, inadequate infrastructure, and a thriving informal economy. Despite these critical concerns, most SWM research in Nepal has concentrated on major cities and tourist hotspots. As a result, the condition of SWM in urban slum areas, typically found along the banks of major rivers in Nepal, remains a critical yet neglected aspect in research and policy discussions. This study, therefore, aims to evaluate SWM in the densely populated urban slum areas situated along the Bagmati River, a key river system in Kathmandu, the capital of Nepal. Four major slum locations within the central metropolitan area of Kathmandu—Sinamangal, Thapathali, Teku, and Balkhu—were selected for the study, and systematic random sampling and characterization of household solid waste was conducted. The results reveal that the average household solid waste generation rates in the four study sites were 155.32 g capita−1 d−1, 124.69 g capita−1 d−1, 149.9 g capita−1 d−1, and 218.44 g capita−1 d−1, respectively. Organic wastes was the most prevalent type, comprising 63.34% of the total waste, followed by paper and paper products (13.72%), plastics (12.15%), dirt and construction debris (5.57%), glass (4.31%), and other wastes (0.91%). Qualitative data from the survey revealed that although municipal waste management programs exist, awareness and participation among residents were limited. As a result, many households ended up managing their waste on their own, often in an unscientific manner polluting the river water in the vicinity. The study offers critical insights for policymakers, operators, and regulators in addressing the growing challenges of SWM. Findings are expected to aid in the sustainable management of solid waste along the river basin in central urban regions of the capital city. Under Nepal's new federal governance system, provincial and local governments are recommended to collaborate with all stakeholders, including households, to develop comprehensive, multimodal SWM strategies that also address the needs of slum areas.

ASSESSMENT OF WASTE GENERATION, COMPOSITION AND REVENUE LOSS ESTIMATION DUE TO FLOATABLE RIVERINE LITTER AT LOG BOOM SUNGAI PINANG, KLANG, MALAYSIA

The presence of floatable riverine litter poses a significant environmental challenge, impacting both aquatic ecosystems and local economies. The purpose of this study is to quantify waste generation and composition based on two different seasons and estimate revenue loss from floatable litter at the log boom in Sungai Pinang. Using systematic waste sampling and analysis techniques, we categorised and measured the types and volumes of waste collected over a specified period. The data revealed substantial quantities of plastic, organic matter, and miscellaneous debris. To estimate the economic impact, we employed a revenue loss model that considers cleanup costs, damage to local fisheries, and the tourism sector. Our findings indicate that the accumulation of floatable riverine litter results in considerable economic losses annually. The study highlights the urgent need for effective waste management strategies and policies to mitigate the negative impacts of riverine litter on both the environment and the local economy.

Effectiveness of Eco Enzymes in Reducing Chemical Parameters of Tofu Factory Liquid Waste in Klumutan Village, Saradan District

The tofu industry generates substantial liquid waste that poses environmental challenges due to its high chemical oxygen demand (COD), total suspended solids (TSS), and pH levels. This study aimed to determine the effectiveness of Eco Enzymes in reducing these chemical parameters in the tofu industry waste in Klumutan Village, Saradan District. Utilizing a Quasi-Experimental method, the research employed purposive sampling of liquid waste from tofu production. The findings revealed that the application of Ecoenzyme at doses of 5%, 10%, and 15%, with detention times of 10, 15, and 20 days, significantly reduced COD, TSS, and pH levels. The results showed that both the dosage and detention time had a substantial impact on the effectiveness of Ecoenzyme in treating the waste. The implications of this study suggest that Eco Enzymes can be an effective, eco-friendly solution for improving wastewater management in the tofu industry, thereby contributing to environmental sustainability.

Analysis of waste generation characteristics as a reference for TPS 3R planning in community-based waste management efforts in Pandansari Lor Village, Malang Regency

Background: Waste management is a critical issue in Indonesia, particularly in rural areas like Pandansari Lor Village in Malang Regency. Improper waste disposal practices, such as open burning and dumping in rivers, pose environmental and health hazards. This study aims to analyze the waste generation characteristics in Pandansari Lor Village as a baseline for planning a community-based Reduce, Reuse, Recycle (3R) waste processing site (TPS 3R). Method: A waste sampling method was conducted following the SNI 19-3964-1994 guidelines to measure the waste generation rate, density, and composition. Findings: The results showed that the average waste generation rate in Pandansari Lor Village was 0.16 kg/person/day or 778.72 kg/day for the total population, with a waste density of 74.02 kg/m³. The waste composition was dominated by organic waste (62.26%), followed by plastic (26.74%), paper (5.89%), and other components. These findings suggest the need for a 3R-based waste management system that involves community participation. Conclusion: The TPS 3R facility should be designed to handle the projected waste generation for the next 10 years, with a capacity of 15,438 L/day. Proper waste segregation, composting of organic waste, and recycling of plastic and other recyclable materials are recommended. This study provides valuable insights for developing a sustainable and effective waste management strategy in rural areas, considering the specific waste characteristics and community involvement. Novelty/Originality of this article: This study proposes a 3R TPS model adapted to rural waste, focusing on organic waste composting and plastic recycling. This model is designed to increase community participation in waste management through community-based education and empowerment.

Processing the Nitrocellulose-containing Waste from the Chemical Industry to Obtain Mineral Soil Additives

A review of scientific and technical literature devoted to the issues of recycling industrial waste from condensed energy systems, which is wastewater sludge from sludge reservoirs of the production facilities, containing cellulose nitrates, has been carried out. Waste sampling was carried out at one of the industry facilities. Using X-ray fluorescence analysis and IR spectroscopy, the chemical composition of the waste has been determined and its environmental hazard class was calculated. Reagents for the destruction of the main component of the waste, as well as the conditions for its recycling, were experimentally selected. Nine compositions of mineral additives based on waste sludge have been obtained, their hazard class and their chemical composition were determined, as well as their effectiveness when applied to podzolic soils.

STUDY OF WASTE GENERATION AND COMPOSITION IN THE TOURIST AREA OF BANDAR LAMPUNG CITY (CASE STUDY: KEDAI GUNUNG BALAU BANDAR LAMPUNG)

The main problem in Kedai Gunung Balau Bandar Lampung is about waste management that is less than optimal, because the waste produced is just piled up and burned immediately. To anticipate waste problems that will cause pollution to the environment, it is necessary to make waste management efforts. Therefore, to plan a waste management system in the Kedai Gunung Balau Bandar Lampung Tourism Area, it is necessary to study the waste generation and composition at that location. The method used is waste sampling carried out for 8 consecutive days which refers to SNI 19-3964-1994. The results obtained are the average weight of waste generation per day of 25.620 kg / day and the average volume of waste generation per day of 0.945 m3 / day. The composition of waste generated consists of 11 types of waste in the form of organic and inorganic waste. The largest waste composition is food waste with a percentage of 19.528%.

Development of a methodology for the sampling and treatment of food waste and food residues in Kara Tepe (Lesvos) refugee camp

AbstractThis research focuses on the management of food waste in small communities such as the one at the Reception and Identification Center (RIC) of Kara Tepe in Lesvos (Greece), using the method of home composting. To understand production patterns and possible variations of the characteristics of food residues, a sampling methodology was designed for obtaining representative samples of the whole population of the center. Two composting trials were carried out using household composters with a tailored active aeration system. The first trial contained food residues and olive leaves as a bulking agent (Κ1), and the second one contained food residues, olive leaves and two-phase olive pomace (K2) to investigate co-composting with local agricultural byproducts. Results indicate that the compost produced in the first trial (K1) was stable but phytotoxic and unsuitable for use as a soil amendment. The compost produced in the second trial (K2) was also stable and non-phytotoxic but potentially harmful for very sensitive plants if used as a soil amendment because of high pH values. In addition, an analysis of the operational cost of the proposed treatment process was performed, involving the estimation of electricity and water consumption. The findings indicate that 304 home composters can cover the requirements of a population of this size (approximately 1300 people), at a cost of a mere 3.36 €/day. Given the unique challenges faced by island communities in contrast to urban areas, including differences in strategy development, waste management practices, infrastructure, cultural considerations and innovation potential, the findings serve as a foundational guide for similar island communities in Mediterranean areas (for policy and decision makers, stakeholders, academia, etc.) to develop tailored strategies within the framework of the circular economy that particularly focus on composting for reducing food waste and utilizing byproducts. Therefore, it is feasible to exploit the proposed methodology in similar-sized communities—villages or even a block of flats—for the on-site treatment and utilization of food residues since it can provide a good-quality compost at a reasonable cost.

Evaluation of the Fertilizing Power of Sludge from Physicochemical Water Purification Stations: Case of the Yato Station, Littoral-Cameroon

The Yato physicochemical water purification station is located in the commune of Dibombari in the Littoral-Cameroon region. It is one of the largest drinking water production stations in the Central African sub-region. This work aims to evaluate the agronomic power of the sludge from this drinking water production station. To achieve this objective, mixed samples of sludge from sludge treatment basins (taken according to the technique described in GIDS-A003 point 6 as explained in the Solid and pasty waste sampling strategy of the Code of Good Practice No. 2). and primary settling basins (collected in transparent 1.5L polyethylene terephthalate bottles) were analyzed. Likewise, three soil samples (marsh, Point 1 and Point 2) were taken and then sent to the laboratory where physicochemical analyzes were carried out. The characteristics of the samples that were analyzed are: particle size, texture (sand, silt, clay) and physicochemistry (organic matter, CEC, sum of exchangeable bases, calcium, nitrogen, potassium and magnesium). The results obtained show that the soils exposed to contamination from the sludge of the station have better agronomic properties both on a physical level with a stable structure favorable to plant growth and good aeration unlike the soils far from the station which presented a high risk. degradation; that on the chemical level with an optimal cationic balance, a high reserve of exchangeable bases, a strong CEC but average limitations in assimilable phosphorus and pH unlike the soil far from the station which presented an insufficiency of potassium which did not facilitate a balance cationic, a low CEC but a pH above 5.5 which is the value recommended in agronomy. Biochemically, organic matter is above 2% in all soils, a mineralization rate less than 20 favoring the rapid mineralization of carbon and a release of nitrogen available to the plant. These results obtained allow us to conclude that the sludge from the Yato station can be used in agronomy as an organic fertilizer in order to correct the soil structure, the CEC, the cationic balances and also provide the soil with a good base reserve. However, treating this sludge with lime could regulate the pH of the soil and reduce the mobility of heavy metals in the soil.

Assessment of the Polluting Status of Sludge from a Physicochemical Water Purification Unit and Their Impacts on the Soil: Case of the Yato Station (Littoral-Cameroon)

The Yato physicochemical water purification station is located in Dibombari District Council in the Littoral-Cameroon region. It is one of the largest drinking water production stations in the Central African sub-region. This work aims to evaluate, through the quantification of the concentrations of Trace Metal Elements (TMEs), the polluting status of the sludge from this drinking water production station and their impacts on the soil. To achieve this objective, mixed samples of sludge from sludge treatment ponds (taken according to the technique described in GIDS-A003 point 6 as explained in the Solid and pasty waste sampling strategy of Code of Good Practice No. 2) and samples of sludge from primary settling basins (taken in transparent bottles in polyethylene terephthalate of 1.5L) were analysed. Likewise, three soil wells were carried out and soil samples were taken on two levels of alteration then sent to the laboratory where physicochemical and TME analyses were carried out. The characteristics of the samples that were analysed are: particle size, texture (sand, silt, clay), physiochemistry (pH, electrical conductivity, temperature, phosphorus, nitrogen) and TME (chromium, copper, zinc, manganese). The results obtained show that the polluting status of the sludge from the Yato station is proven because their pollution index by heavy metals is greater than 1. The pollution index greater than 1 in the sludge from the treatment basins is due to the strong concentrations of TME originating from the accumulation of waste of all kinds in this location. Overall, TME concentrations in soils decrease for the most part from the surface towards depth. All the TMEs studied (Zn, Mn, Cu, Cr) are present in all horizons. There is multiple contamination of sludge by TMEs because their pollution index is greater than 1 (IP>1). Although the sludge pollution indices are greater than 1, those of the different horizons are much lower than 1. Thus, since the TMEs decrease with depth, the subsurface horizons would be less affected by the pollutants contained in the station sludge. marking a real pollution of the surface layers.

Calculating the Amount of Plastic Waste Based on Type at the Supit Urang Malang Final Processing Site (TPA)

Waste is one of the crucial environmental problems in Indonesia. Malang City produces around 485 tons of waste every day. This research aims to identify what types of plastic waste are selected at the Supit Urang Final Processing Site and to find out the mass of each type of plastic waste that is sorted, to analyze the volume of plastic waste differentiated based on the types at the Supit Urang Landfill, Malang City. Plastic waste is non-organic waste that is difficult to decompose naturally. In 2019, the Regional Environmental Management Agency (BPLHD) stated that plastic waste in Jakarta reached 13% of 6,000 tons per day and annual calculations reached 5.4 tons. Determining the number of samples in this study used the SNI 19-3964-1994 approach, the waste sampling method, sampling method, and analysis of plastic waste samples were chosen in the research methodology. The research results showed that the types of plastic waste at the Supit Urang landfill include polyethylene terephthalate (PET), low-density polyethylene (LDPE), polypropylene (PP), and others (O), with a mass of each type, namely Polyethylene Terephthalate (PET) 27.7 kg, Low-Density Polyethylene (LDPE) 27.5 kg, Polypropylene (PP) 23.2 kg and Others (O) 21.7 kg. It is hoped that sorting plastic waste according to type through further processing can reduce waste generation in general, especially in Malang City.

Valorization of Urban Solid Waste: An integrated and sustainable approach

Purpose: To propose a materials recovery system for the historic Center of Cuernavaca, Morelos, Mexico, with the aim of improving waste management and generating income for the municipality. Methodology: Information was gathered from electronic documents, interviews with local authorities, and companies. Additionally, a waste sampling was conducted to address an objective material recovery estimate, simulating three economic scenarios (including the participation of material reclaimers).Findings: The proposed system is viable, managing the recovery of the initial investment in the first year (baseline scenario), considering the donation of fixed assets by sponsors, resulting in a double return on investment.Practical implications: The study involves an on-site characterization sampling; thus, requires further detailed analysis.Originality: An inclusive economic system that generates income and employment is demonstrated, contributing to responsible waste management, compliance with regulations, and objectives of the 2030 agenda.

Evaluation of Domestic Solid Waste Management in Cai Rang District, Can Tho City, Vietnam

The study was conducted to evaluate the management of domestic solid waste in Cai Rang district, Can Tho city. The study conducted sampling of domestic solid waste from 20 households in four wards Le Binh, Hung Phu, Ba Lang, and Tan Phu within 07 days from March 6 to 12, 2023. At the same time, three groups of subjects including 120 households, 3 Environmental Managers, and 3 employees of Urban Environment Joint Stock Company were interviewed to collect information. The result showed that the average domestic solid waste generation coefficient reached 0.28 kg/person/day, and the amount of domestic solid waste generated can reach about 11,027.3 tons by the end of 2023. Of which, up to 91% of the volume of domestic solid waste was recyclable, including 52% of biodegradable organic waste, and 39% of recyclable waste. As for domestic solid waste management, there was still a limitation in classifying waste at source, this rate only fluctuates between 43.4-86.7%. Besides, the rate of households registered for domestic solid waste collection service had a difference between urban and rural areas, fluctuating from 76.7-96.7%. After being collected, domestic solid waste was transported to the Can Tho household waste incineration plant (EB plant). Meanwhile, the remaining amount of domestic solid waste was treated using unsanitary landfill methods, and thrown into rivers, causing environmental pollution, and public health. Although propaganda activities related to domestic solid waste management were carried out in four wards in Cai Rang district, Can Tho city. However, the level of implementation of these activities was not regular. From that, the study identified a number of difficulties in domestic solid waste management, including solid waste that was not completely classified at source, and garbage collection services that were not organized throughout the area. The district lacked specialized waste collection vehicles after classification, and public propaganda, and education work were limited. This research will help local authorities come up with specific solutions to improve the quality of solid waste management in Cai Rang district, Can Tho city.

Abundance and Composition of Solid Waste in the Citarum River, West Java Province

The Citarum River is the longest and largest river in West Java and is widely used by the community for various purposes. One of the problems that occurs in rivers is the generation of solid waste that flows into the river. Therefore, this study aimed to analyze the abundance and composition of solid waste on the surface of a river during a certain period. The study was conducted from April to June and August to November 2021. Sampling was carried out once a month with three repetitions, namely morning, noon, and evening, at the five sampling stations. Station locations were divided based on the type of flow, namely, on the mainstream of the Citarum River and tributary streams. The sampling of solid waste is carried out using a frame pocket net (FPN) shaped like a net to capture solid waste that flows on the surface of the river. The highest waste abundance was 0.1569 kg/m3· h in the urban areas. The type of waste that dominated the river was organic waste, which reached 62.8%. Other types of solid waste found were macroplastics, hazardous and toxic materials, metals, rubber, textiles, and paper. Solid waste management needs to be carried out based on the area and is sustainable, and can be pursued by implementing 3R (reuse, reduction, and recycling).

Characterization for optimizing the integrated management of solid waste for energy recovery and circular economy.

Municipal solid waste (MSW) management poses a significant environmental challenge in municipalities across developing nations worldwide. Our studies were focused on characterizing the waste and analyzing the chemical properties of mixed waste fractions to assess their potential for waste-to-energy conversion. The objective of our study was to scrutinize the existing state of the MSW management system and gauge its waste generation rates. Specific ASTM methods were employed to carry out both physical and chemical characterizations. The outcomes reveal that the city generates a daily volume of 1155 tons of domestic solid waste (DSW), translating to a generation rate of 0.51kg-1 capita-1day-1. When analyzed by source, organic matter emerged as the predominant constituent, accounting for 73.74% of the waste, followed by combustible content waste at 15.17%. The moisture content of MSW ranged between 26 and 58% throughout the seasons, while volatile solids varied from 22.35 to 99.74%. Among the components screened, carbon and oxygen stood out as the dominant elements. The calorific values encompassed a broad range, ranging from 14.87MJkg-1 for leather waste to a substantial 25,629.27MJkg-1 for organic waste. To alleviate the escalating burden of increasing solid waste generation, alternative treatment approaches were recommended. These include composting, biomethane plants, the establishment of recycling facilities, and the enhancement of existing landfill sites to scientifically designed landfills. In summary, the findings from this study provide valuable insights for regulatory bodies and municipal authorities. These insights can guide the formulation of policies concerning waste sampling, characterization, segregation, and the implementation of education and awareness campaigns.

Potential of Reduction Solid Waste from Office Building (Case Study: Gedung Polda Jambi)

Solid waste management in building can be managed with the waste management policy and waste management practice tools. It is contained in the concept of green building. The purpose of this study was to analyze the potential reduce of solid waste in office buildings which is managed by waste management policy and waste management practice tools, and provide scheme recommendations for solid waste management for office buildings the object of this study is Jambi Regional Police Office Building. The methodology was a survey method with solid waste sampling (SNI 19-3964-1994) in Building A, Building B, Canteen and Garden Area and Parking The sampling did for 8 days. Quantitative and quantitative parameters were obtained from the calculation of the generation and composition of solid waste, and also interviews. The results for the generation of solid waste on Jambi Regional Police Office Building: 40.40 kg/day or 0.027 kg/person.day (consist of 45% organic, 28% inorganic, 26% paper and B3 0.7% and others 0.3%). Recommendations scheme can be given for solid waste management in the form of the application of waste management practice tools are started from modification of the waste into separate, collection is done as often as possible, solid waste treatment is done composting and sales to waste banks. The potential for reducing solid waste if the waste management policy and practice tools are applied is 85.64% to 5.8 kg/day.

Identifikasi Dan Kepadatan Sampah Anorganik Di Pantai Ujong Blang Desa Ujong Blang Kecamatan Banda Sakti Kota Lhokseumawe

The phenomenon of marine debris can cause unrest among the community because it can cause marine pollution that affects the activities of coastal communities. This research was conducted with the aim of knowing the type, density and rate of increase of inorganic waste. The research location is at Ujong Blang Beach, Ujong Blang Village, Banda Sakti District, Lhokseumawe City on November 1-13 2021. The method used is purvosive sampling. The waste sampling technique uses a line transect method drawn from the shoreline along the 50 meters in the direction of the coastline and 10 meters towards the sea, in which there are 3 plots measuring 10x10 m2, the distance between the plots is 10 meters. The waste that is taken is waste that is on the substrate, the observed waste is macro-sized inorganic waste. The results showed that the garbage collected at Ujong Blang Beach, Ujong Blang Village, Banda Sakti District, Lhokseumawe City consisted of 5 types, namely plastic, metal, glass, rubber and clothing. Plastic waste has the highest density value, namely 1.59 items/m2 with a relative density value of 95.22%. The highest density value based on the mass of waste is also found in the type of plastic waste, which is 4.64 gr/m2 and a relative density of 78.64 %. The value of the highest rate of increase in waste was on Sunday with a total of 90.5 pieces of waste and a mass of 437.5 g of waste.

Geochemical modeling of CO2 sequestration in ultramafic mine wastes from Australia, Canada, and South Africa: Implications for carbon accounting and monitoring

Passive carbonation in ultramafic mine wastes results from the spontaneous reaction of gangue minerals with carbon dioxide (CO2) to form stable carbonate minerals that store CO2. Mines can benefit from unintentional CO2 sequestration to offset greenhouse gas (GHG) emissions. Quantitative X-ray diffraction (QXRD) analysis of numerous samples of mine wastes has typically been used to quantify passive carbonation rates. This analysis yields valuable information about carbon sinks; however, extensive mineralogical assessments are technically demanding and cost-prohibitive for routine carbon accounting. Alternatively, we explored using inverse geochemical modeling to estimate passive carbonation rates and monitor CO2 sequestration in active mines. Water chemistry data, tailings mineralogy, and operational information routinely collected by mines were used as inputs for models. The predictive capabilities of the models were tested for Mount Keith nickel mine (Australia), Diavik diamond mine (Canada) – for which rates were previously determined using QXRD. A new site — Venetia diamond mine (South Africa) — was used to illustrate the potential of geochemical modeling for carbon accounting and as a long-term monitoring tool for CO2 sequestration. Mount Keith models predicted passive carbonation rates (3900 g CO2/m2/yr) consistent with previous QXRD assessments (2400 g CO2/m2/yr; 172 samples) using only two water samples. CO2 removal rates for Diavik were found to be impacted by seasonality and to range between ∼375 and 510 g CO2/m2/yr, showing similarities with previous QXRD rates estimates (313–350 g CO2/m2/yr). With the long-term water chemistry records (2009–2018) available for Venetia mine, we predicted calcite as the main CO2 sink and that ∼14,875 t CO2 were stored in the kimberlite residues impoundments (3.5 km2) over 9 years at a rate of ∼470 g CO2/m2/yr. Moreover, long-term monitoring shows a decline in CO2 removal rates at Venetia, possibly due to changes in kimberlite reactivity and current mine waste disposal practices. Overall, inverse modeling proved that it can be a viable alternative or complement to QXRD techniques for carbon accounting in active mines, substantially reducing the need for mine waste sampling and permitting long-term monitoring. Moreover, the model shows how passive carbonation rates change dynamically with the mine production and waste management practices. Simultaneously, the model provides insights into potential mineral reactions operating in tailings and that regulate carbon sequestration mechanisms. For that reason, this accounting technique has an enormous potential to assist in decision-making for implementing enhanced CO2 sequestration strategies (e.g., enhanced rock weathering) and to support carbon sequestration monitoring, validation, and reporting in active mines.

PROXIMATE LOCAL FOOD WASTE IN ALTERNATIVE FISH FEED PRODUCTION IN SOUTHEAST MALUKU

Utilization of local food waste as an innovation in diversifying quality fish feed products in producing superior seeds. The study aimed to determine the nutritional content of local food waste. The research was carried out for 2 months,. The pr,imate analysis method (AOAC, 2005) and the results are presented in table and descriptive form. The research was conducted in two stages, namely 1). Local food waste sampling stage and 2) proximate analysis stage. The results obtained are proximate coconut cake which includes protein content: 7.29%, fat: 38.76%, water content: 3.05%, ash content: 22.247% and crude fiber: 24.29%. The proximate content of cassava leaves includes: protein content: 22.53%, fat: 5.05%, water content: 5.1%, ash content: 22.75%, and crude fiber: 33.46%, nutritional content of Moringa leaves among others: protein content: 25.66%, fat: 2.54%, water content: 7.4%, ash content: 22.247%, and crude fiber: 30.01%. The results show that local food staples still have a high enough nutritional content so that they can be used as raw materials for fish feed.

The inherent variability of some environmental analytical methods hampers the circular economy of materials

This paper is the third part of three papers on sampling by the number of particles, focusing on analytical variability. The objective is to propose a target variability of waste and contaminated soil analyses (extraction and quantification), that can be used for calculation of the size of a representative sample. Data of intra- and inter-laboratory variability are presented. As the variability of the quantification step (after extraction) is limited in waste and soil analyses to about 0.01, the analytical variability stems from three main sources: (i) non-homogeneous test portions; (ii) for partial extraction methods, variable extraction rate, due to presence of options in the method or insufficient time for equilibrium (leaching or percolation test, biotests); and (iii) ill-defined solid/liquid separation (leaching or percolation tests), critical since there are colloids and nanoparticles in the leachates, representing from 0 to 100% of the element fraction in the leachate. Counter-intuitively, the centrifugation (annex E of EN 12457) series before the 450 nm-filtration delivers leachates more concentrated in particles (median size 150 nm, 1 sample) and statistically more concentrated in elements (+13%, 27 samples, 287 paired data). Without centrifugation, the filter cake that builds up on the membrane is an additional filter. A target intra-laboratory variability of CVr = 0.10 (10%) and inter-laboratory variability of CVR = 0.20 (20%) is proposed for all analytical methods. The methods with higher CVr and CVR should be revisited to not jeopardise the sampling and characterisation efforts of waste and soil, particularly for valorisation in the circular economy.