Optimization of the firebox of a biomass-fired boiler

The most common fuel in crop drying is natural gas. Replacing this for renewable energy is both environmentally and economically beneficial. As a by-product of crop cleaning during harvesting, a source of energy suitable for combustion can be obtained from plant parts that are otherwise treated as waste. Solid fuel requires a special fuel system. Our goal is to find an optimized design for cleaning waste based on the existing solid fuel boilers, and in the framework of this work, the optimal design of the fire box passages is our narrower goal. To do this, we use CFD modelling, which is used to estimate the flow characteristics based on a 3D model in addition to the known operating parameters. By modifying the geometry between given boundaries, we find the ideal design within the boundaries allowed by the construction.

RECYCLE GLASS WASTE AS A REPLACEMENT OF FINE AGGREGATE IN CONCRETE MIX STANDARD COMPARISON

Recycling is one way that is used to minimize the amount of waste that exists. Recycling is also a process to reduce the use of new raw materials, reduce energy use, reduce pollution, land degradation and greenhouse gas emissions. Materials that can be recycled consist of waste of glass, plastic, paper, metal, textiles and electronic goods. Glass has characteristics suitable as concrete aggregates, considering that glass is a material that does not absorb water. In addition, glass has high abrasion resistance. Meanwhile, the waste glass flux lowers the temperature to the temperature at which the formers will melt. Stabilizers in glass waste are made of calcium carbonate, which makes the glass waste solid and water-resistant. This glass waste is recycled by mixing it into the concrete mix. The recycling method is done by pounding the glass and putting it into the concrete mix stage. The purpose of mixing the glass waste is expected to increase the compressive strength of concrete. The use of glass waste as a mixed material affects the compressive strength of the concrete. The concrete with the most inferior to highest compressive strength is 4% variation concrete, 2% variation concrete, and traditional concrete. Optimal percentage addition of glass waste impacts on maximum concrete compressive strength is 2% mixture variation which obtained 11,88 Mpa & 11,32 Mpa.

Assessment of asbestos and asbestos waste quantity in the built environment of transition country

Managing asbestos streams in developing and transition countries is particularly challenging. Deficiencies are often present for adequate procedures for the management of asbestos waste; solid quality data or databases on the quantities of asbestos production and usage are missing and asbestos inventories or the registry of asbestos-related diseases following European Union (EU) or other regulations are not in place. This paper aims to develop a model for determining and assessing the quantity of asbestos in the built environment of a transition country. Quantities of asbestos products and life expectancy of those products were assessed to develop a model that forecasts flows and stocks of asbestos products and wastes. The overall objective is to evaluate the model and show the manifestation of asbestos in the waste stream in a case study on a country with a transition economy, such as Serbia. Results show that total quantities of asbestos fibre consumption are approximately 0.5 million tonnes; the largest amount of waste generation is expected in the 2020s. Therefore, it is necessary to prepare for the forthcoming quantities of waste by improving legal procedures, implementation of existing regulations, and provision of economic resources. An important link for the adequate management of asbestos waste is to raise public awareness of the dangers and importance of proper and timely disposal of asbestos products.

Wedge method for landfill stability analysis considering temperature increase

The increase in landfill temperature often results in shear strength reduction of both the solid waste and the liner, which leads to slope instability. However, very few landfill slope analysis methods can simultaneously consider the effect of temperature on the shear strength of the waste solid and the liner. In this study, based on the strength parameters of the liner and waste with temperature, a wedge method for translational failure analysis of landfills considering temperature increase was established. The results showed that rising temperatures caused by biochemical degradation at the bottom and middle of the landfill reduced the anti-slide force of back slope more than that of bottom slope. With the leachate level increasing, the effect of temperature rise on landfill stability became obvious. The feasibility of the proposed wedge method was verified by the engineering case study of Xiaping Landfill, Shenzhen, China. This study probably provides important guidance for the design, operation and management of municipal solid waste landfills.

Physicochemical characteristics of fiber rich flour from solid waste of purple sweet potato starch processing

Sweet potato starch processing produces liquid waste and solid waste. Solid waste from sweet potato starch processing contains a high concentration of fiber so that it can be used for making fiber flour, which can be used as material for food fiber fortification in foodstuffs. This study aims to evaluate the characteristics of fiber flour derived from the solid waste of purple-fleshed sweet potato (PFSP) starch processing. Starch processing is carried out using 3 different types of extracting ingredients, namely distilled water, 2000 ppm sodium metabisulfite solution, and 2000 ppm citric acid solution. The results showed that the yield of fiber flour produced was 4.07-5.11%. The resulting fiber flour has soluble and insoluble fiber content between 1.20-1.63 and 13.53-21.91% respectively. The results of this study indicate that fiber-rich flour from the solid residue of PFSP starch processing can be used as a fiber fortification agent in special food products for people with obesity.

RESÍDUOS SÓLIDOS DE SAÚDE GERADOS POR USUÁRIOS DE INSULINA EM DOMICÍLIO: UMA ANÁLISE DA SEGREGAÇÃO, ACONDICIONAMENTO E DESTINAÇÃO FINAL

<p>Uma dificuldade vivenciada pelos centros urbanos é o gerenciamento adequado dos resíduos sólidos gerados. Os resíduos cujos impactos têm maior alcance requerem atenção especial. Existem resíduos de serviços de saúde (RSS) gerados no ambiente domiciliar por pessoas acometidas de alguns tipos de enfermidades. Um destes casos são os portadores de diabetes melito. Para controlar a doença, os pacientes usam insulina injetável em seus domicílios; e os resíduos produzidos pela insulinoterapia são um grande problema de saúde pública. O objetivo deste estudo foi analisar como os usuários de insulina manejam os RSS em seus domicílios no que se refere a sua segregação, seu acondicionamento e sua disposição final. Trata-se de uma pesquisa exploratória descritiva, com abordagem quantitativa. Uma amostra de 42 pacientes selecionados a partir de critérios predeterminados respondeu a um questionário elaborado com base em um estudo acadêmico anterior. A análise dos resultados mostra que 28,5% separam os resíduos em domicílio, enquanto 36% os descartam em lixeira comum, e que a maioria não sabe para onde encaminhar os resíduos e apenas 26% receberam algum tipo de orientação sobre esse manejo. Este estudo conclui que há necessidade de implantação de programas educativos eficientes que possam oferecer orientações corretas aos pacientes insulinodependentes e que tenham o olhar voltado para questões ambientais.</p><p><strong>Palavras-chave<em>:</em></strong> Descarte; Insulinoterapia; Resíduos dos Serviços de Saúde; Resíduos Sólidos</p><p> </p><p>SOLID HEALTH WASTE GENERATED BY HOUSEHOLD INSULIN USERS: AN ANALYSIS OF SEGREGATION, PACKAGING AND FINAL DESTINATION</p><h2>Abstract</h2><p>One difficulty experienced by the urban centers is the generation of solid waste and its adequate management. Impact wastes with greater reach require special attention. There are waste from health services (HSW) generated in domestic manner by people that have a disease called Diabetes Mellitus. For the control, injectable insulin is used in their homes, and the production of these residues in their residences is a major public health problem. The aim of the study was to analyze how the handling of HSW is carried out, at the household level of insulin users, with regard for segregation, packaging and final disposal. The research was carried out through data collection with a directed questionnaire. 42 patients responded. It was observed that 28.5% separate the residues at home, while 36% discard the residues in a common trash, most do not know where to send the residues and only 26% received some type of guidance on this management. The need to implement efficient educational programs to address this context was identified.</p><strong>Keywords</strong><em>:</em> Disposal; Insulin Therapy; Health Service Waste; Solid Waste

Vacuum Pneumatic Transport for Industrial and Utility Components

Waste generation in the life of people and enterprises is an inevitable process today. The level of utilization of municipal waste has increased on average to 23 % in Belarus. The paper provides an assessment of the existing systems for the collection and disposal of waste solid household items based on technological stages (preparation of waste for loading into a garbage collection vehicle; organization of temporary storage of waste in households, at enterprises; collection and removal of waste from the territories of households, organizations and enterprises; neutralization, processing and recycling of waste). The consequences of untimely collection of solid household and industrial waste are considered in the paper. The paper presents the factors that have a harmful effect on the human environment and the ecology of the territories of settlements and enterprises. An analysis of the effectiveness of the timely removal of such components in the systems of municipal services of cities and enterprises as an important component providing social, economic and environmental significance is given in the paper. At the present stage of the development of technology and available technologies, one of the most rational and economically justified ways of delivering waste to the areas for their sorting and processing is vacuum transportation using pipeline transport. Its application is justified for industrial zones and settlements with high and medium population density. Moreover, such a pipeline can be laid next to existing pipeline and other transport communications.

Kajian Timbulan dan Komposisi Sampah di Kampus Institut Teknologi Nasional Bandung (Itenas)

ABSTRACT Educational institutions are places to conduct research and innovation to improve the quality of an independent environment. This study aims to determine the amount of waste generation and composition of institutions, especially the Bandung National Institute of Technology (Itenas). The sampling method is based on SNI 19-3964-1994 by measuring the production and composition of waste for eight consecutive days. The study results obtained an average generation of Itenas waste of 0.015 kg/m2/day or 0.156 kg/person/day in units of weight and 0.242 liters/m2/day or 2.446 liters/person/day in units of volume. The composition of Itenas waste is dominated by organic waste by 50.78%, which consists of food scraps and leaves, while other waste compositions include 14.09% plastic; 4.54% cardboard; 2.33% paper; 1.93% fabric; 1.21% glass; 0.08% cans; 0.03% metal; and 24.99% residue or other waste. The highest activities that produce organic waste in Itenas are canteen activities, while the Student Center (SC) activities make the highest amount of recyclable waste. Keywords: institutional solid waste, solid waste generation, waste composition, Bandung National Institution of Technology (Itenas) ABSTRAK Institusi pendidikan adalah tempat untuk melakukan penelitian dan inovasi untuk meningkatkan kualitas lingkungan yang mandiri. Penelitian ini bertujuan untuk menentukan besaran timbulan dan komposisi sampah dari institusi khususnya Institut Teknologi Nasional Bandung (Itenas). Metode sampling yang dilakukan berdasarkan SNI 19-3964-1994 dengan cara melakukan pengukuran timbulan dan komposisi sampah selama 8 hari berturut-turut. Berdasarkan hasil penelitian diperoleh rata-rata timbulan sampah Itenas sebesar 0,015 kg/m2/hari atau 0,156 kg/orang/hari dalam satuan berat dan 0,242 liter/m2/hari atau 2,446 liter/orang/hari dalam satuan volume. Komposisi sampah Itenas didominasi oleh sampah organik sebesar 50,78% yang terdiri dari sisa makanan dan dedaunan, sedangkan komposisi sampah lainnya antara lain 14,09% plastik; 4,54% kardus; 2,33% kertas; 1,93% kain; 1,21% kaca; 0,08% kaleng; 0,03% logam; dan 24,99% residu atau sampah lainnya. Kegiatan yang paling tinggi menghasilkan sampah organik di Itenas adalah kegiatan kantin sedangkan kegiatan Student Center (SC) menghasilkan sampah daur ulang yang paling tinggi. Kata kunci: sampah institusi, timbulan sampah, komposisi sampah, Institut Teknologi Nasional Bandung (Itenas)