Bio-Drying of Biodegradable Waste for Use as Solid Fuel: A Sustainable Approach for Green Waste Management (original) (raw)
Related papers
Pre-treatment and utilization of food waste as energy source by bio-drying process
Energy Procedia, 2017
In this study, three different sets of experiments were conducted with the aim of evaluating the effects of initial moisture content and bulking agent on bio-drying efficiency of food waste as well as weight reduction. Results showed that initial moisture content has a significant impact on bio-drying, affecting temperature and water removal rate as well as volatile solid degradation, with higher maximum temperature obtained in Trial 3 (initial moisture content of 44.95 %) and lowest maximum temperature obtained in Trial 1 (initial moisture content of 69.29 %). The bio-drying index indicated that Trial 2 had higher water removal efficiency (72.96 %) with less organics consumption (bio-drying index = 10.1). On the whole, Trial 1, 2 and 3 saw a weight reduction of 54.63 %, 42.56 % and 35.33 % alongside a moisture reduction of 53.26 %, 47.46 % and 64.51 % respectively. This finding suggests that the use of bulking agent has significant effect on the initial moisture content with subsequent impact on bio-drying efficiency which could provide some promising approach to pre-treat organic waste to reduce the moisture content, weight and volume and increase the energy value for solid recovered fuel generation (SRF).
Bio-drying of green waste with high moisture content
Process Safety and Environmental Protection, 2017
Highlights Four different sets of bio-drying processes were conducted for green wastes and the impact of bulking agent was evaluated. This study showed that bio-drying is an effective approach for moisture and weight reduction of green waste, preserving most of its energy contents. A mixed green waste with bulking agent was found to be preferable since it provided real porosity which was crucial for moisture reduction with no leachate genereation.
Bio-drying Technology of Solid Waste to Reduce Greenhouse Gas
E3S Web of Conferences
Bio-drying technology is a solid waste treatment with a decentralized system, in which solid waste will undergo biological-mechanical bioconversion. The heat generated from the aerobic decomposition process of organic compounds combined with excess air serves to drain solid waste. The bio-drying process will emit VOCs and other gases that potentially cause global warmings such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) gases. The research method used variation of airflow from 0, 2, 3, 4, 5, and 6 l/m. N2O gases were analyzed using Chromatography gas. The results showed that the bio-drying process was able to reduce the water content from 69% to 40% by the thirtieth day. N2O concentration difference between control (no aeration) and waste with bio-drying processing is 534.69 ppb and 175.48 ppb respectively at 1st day. N2O concentration are known when the bio drying process uses a 4 l / m discharge.
Journal of Environmental Management, 2020
A macro-thermogravimetric analysis (macro-TGA) was applied to analyse the non-isothermal drying of different bio-wastes (quince solid waste, grape marc and pumpkin shell from different enterprises located in San Juan Province, Argentina). The experimental data were obtained at three heating rates (5, 10 and 15 K/min) and two different initial moisture contents (30 and 50% w/w). These data were fitted using the Coats-Redfern and Sharp methods. The D2 model showed the best fitting for all experiments when using the Coats-Redfern method. It is assumed that drying occurs on the solid boundary. The predicted E a values ranged from 43.60 to 64.50 kJ/mol for the three bio-wastes under the different experimental conditions. The E a value slightly increases with the increase in heating rate because the wastes require more energy to undergo drying. Deff increases moderately with temperature at the beginning of the dehydration process; then, this increasing behaviour is significant due to the loss of continuous moisture channels. Otherwise, Deff increases with the initial moisture content, showing that the humidity of the samples did not reach the saturation content.
Drying of Food Waste for Potential Use as Animal Feed
Sustainability
A considerable part of food is wasted, causing investment capital loss as well as environmental pollution and health problems in humans. Indirect solar drying was applied to test the potential of drying and reusing this waste as a component of animal feed. The effect of weather changes on drying kinetics and the effective diffusion coefficient, dried feed nutritional composition, and microbiological analysis of the dried product were investigated. A convective laboratory dryer was used as a reference method. Weather conditions have a crucial effect on the use of solar drying; one sunny day with appropriate conditions can reduce the water activity of food waste to below 0.3 and moisture content to below 6%. Much better fitting of experimental and model drying curves was achieved considering sample shrinkage, applying a more complex solution of Fick’s second law combined with an optimization procedure. The studied food waste had a good combination of nutrients, such as protein, fat, a...
Improvement of energy recovery potential of wet-refuse-derived fuel through bio-drying process
Journal of Material Cycles and Waste Management
This paper proposes novel wet-refuse-derived fuel (Wet-RDF) bio-drying process with the variation of initial organic substrate and moisture content. The bio-drying was carried out using 0.3 m 3 lysimeter aerated continuously at different rates. Two conditions of Wet-RDF feedstock tested included: Experiment A-37% organic substrate and 58% moisture content with an initial heating value of 2,889 kcal/kg; and Experiment B-28% organic substrate and 35% moisture content with an initial heating value of 4,174 kcal/kg. The bio-drying was performed in both experiments under negative ventilation mode and non-ventilation mode, the ventilation mode was set at the aeration rates of 0.2 m 3 /kg/day and 0.4 m 3 /kg/day. The results suggest that the optimum aeration rate was 0.4 m 3 /kg/day, achieving a 30% moisture reduction and a 60% heating value increase from their initial values. As a result, the improved wet-RDF qualified for the local cement industry's standard in terms of heating value.
International Journal Science and Technology
This waste problem can be used as new and renewable energy in the form of Refuse Derived Fuel (RDF) fuel. Due to its relation to energy, the calorific value of garbage becomes an important parameter. Water content is one of the important parameters that determine the calorific value. If the moisture content of the waste is high, then the energy needed for drying and destruction through combustion is also high, so a process of reducing the water content in the waste is needed. The drying mechanism is the most important part of the drying technique because by knowing the drying mechanism, it can be estimated the amount of energy and the need for the optimum air mass for drying. This study is to evaluate the needs of air masses, the amount of drying energy needed, then a comparison of drying calculations using the Relative Humidity dryer method through air media is heated by drying using the evaporation method through boiling by heating the walls of the drying room. The energy require...
Study of drying systems for the utilization of biodegradable municipal solid wastes as animal feed
Waste Management, 2006
The eVectiveness of diVerent drying systems used for the dehydration of certain fractions of biodegradable municipal solid wastes with a high moisture content (fruit and vegetable remains) was analyzed. Some tests using small amounts of the material were carried out in natural and forced convection ovens. For larger quantities of wastes, a discontinuous cabinet dryer and a continuous rotary dryer were used. With these dryers, the moisture content was reduced from 800 to 100 g kg ¡1. It was veriWed that the continuous rotary dryer was the most eYcient type of equipment studied, since it allowed a dried waste to be obtained with better nutritional and microbiological qualities and in accordance to the speciWcations of the products for animal feeding.
MSW Bio-Drying: An Alternative Way for Energy Recovery Optimization and Landfilling Minimization
scientificbulletin.upb.ro
În cadrul gestiunii deşeurilor solide urbane (DSU), în concordanţă cu noile directive Europene cu privire la recuperarea materialelor şi valorizarea lor energetică, o nouă opţiune bazată pe trateatea bio-mecanică (TBM) cu flux unic a deşeurilor solide urbane este în continuă devoltare. Acest process de tratare poate fi utilizat atât ca un pretratament înaintea depozitării controlate sau /şi înaintea combustiei. In acestă lucrare se prezintă anumite aspecte ştiinţifice legate de introducerea acestui tratament bio-mecanic în România şi a utilizării Combustibilului Derivat din Deşeuri (CDD), în instalaţii industriale, cu minimizarea volumului necesar depozitării. Rezultatele au fost obţinute în cadrul unei colaborări ştiinţifice dintre