Pilot-scale grinding and briquetting studies on variable moisture content municipal solid waste bales – Impact on physical properties, chemical composition, and calorific value

AbstractTo carry out autothermal drying processes during the composting of biomass, a horizontal tubular reactor was designed and tested. A biodrying tunnel of the total capacity of 240 dm3 was made of plastic material and insulated with polyurethane foam to prevent heat losses. Municipal solid waste and structural plant material were used as the input substrate. As a result of autothermal drying processes, moisture content decreased by 50 % of the initial moisture content of organic waste of about 800 g kg−1. In the tested cycles, high temperatures of biodried waste mass were achieved (54–56°C). An appropriate quantity of air was supplied to maintain a satisfactory level of temperature and moisture removal in the biodried mass and high energy content in the final product. The heat of combustion of dried waste and its calorific value were determined in a calorimeter. Examinations of pyrolysis and gasification of dried waste confirmed their usefulness as biofuel of satisfactory energy content.

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Effect Of Water Content On Characteristics Fuel From The Municipal Solid Waste Through The Pyrolysis Process

R E M (Rekayasa Energi Manufaktur) Jurnal ◽

10.21070/r.e.m.v5i2.974 ◽

2021 ◽

Vol 5 (2) ◽

pp. 9-16

Author(s):

Imron Rosyadi ◽

Ni Ketut Caturwati ◽

Ahmad Fauzi

Keyword(s):

Moisture Content ◽

Municipal Solid Waste ◽

Solid Waste ◽

Water Content ◽

Biomass Conversion ◽

Calorific Value ◽

Treatment Method ◽

Volatile Matter ◽

Average Error ◽

Rice Samples

The increase in the population of Indonesia is proportional to the increase in the amount of waste produced. Municipal solid waste (MSW) especially organic waste, can be used as solid fuel by means of the torefaction process. Torefaction is a thermo-chemical heat treatment method for biomass conversion that takes place at a temperature of 200oC to 300oC under conditions of atmospheric pressure and in the absence of oxygen. The purpose of this study was to determine the effect of moisture content on calorific, proximate and ultimate values of torefaction samples using municipal solid waste. Setting the water content in the mixed sample (30% rice + 70% wood) with variations in moisture content of 30%, 40%, and 50%; and rice and wood samples with variations in moisture content of 40% and 50%. The torefaction was carried out at a temperature of 300oC for one hour and inert gas N2. Torefaction products have been tested contain of the calorific value, proximate testing, and ultimate testing. The results obtained were the best calorific value in the rice sample, the moisture content of 40% was 6351.1 cal / g or equivalent to sub-bituminous coal. The proximate and ultimate results of the best heating value are rice samples with 40% moisture content, fixed carbon 62.95%, volatile matter 27.85%, moisture 7.06%, ash 2.14%, carbon 71.85%, hydrogen. 2.80%, nitrogen 3.17%, and sulfur 0.05%. The calorific value calculation method that is almost close to the test results is the Dulong method, with an average error percentage of 1.63%.

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Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator

E3S Web of Conferences ◽

10.1051/e3sconf/202019404019 ◽

2020 ◽

Vol 194 ◽

pp. 04019

Author(s):

Haichuan Wang ◽

Yanfen Liao ◽

Xiaoqian Ma ◽

Xianghao Zeng

Keyword(s):

Moisture Content ◽

Municipal Solid Waste ◽

Solid Waste ◽

Calorific Value ◽

Waste Incinerator ◽

Mixing Proportion ◽

Excess Air Coefficient ◽

Secondary Air ◽

Solid Waste Incinerator ◽

Dynamics Method

Incineration is widely used as an important method of sludge and garbage utilization and harmless treatment. The simulations of co-incineration of sludge and municipal solid waste are conducted by computational fluid dynamics method(CFD) in a MSW incinerator. The study focuses on the effect of mixing proportion, moisture content of sludge, excess air coefficient and primary and secondary air distribution ratio on the combustion progress. Simulation results indicate that the combustion temperature of furnace decreases rapidly with the increase of the mixing proportion and moisture content of sludge, which is mainly because the moisture content of sludge is higher than that of MSW as well as its low calorific value. As a result, it is recommended that the water content and mixing ratio of sludge would be controlled below 40% and 7% respectively. Therefore, the fresh sludge should be dried before entering the furnace.

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Comparison of biogas production obtained from samples of Mitú and Sibundoy municipal solid waste

Ingeniería e Investigación ◽

10.15446/ing.investig.v39n2.78597 ◽

2019 ◽

Vol 39 (2) ◽

Author(s):

Kelly Marcela Triana Jiménez ◽

Mario Enrique Velasquez

Keyword(s):

Anaerobic Digestion ◽

Moisture Content ◽

Municipal Solid Waste ◽

Solid Waste ◽

Organic Waste ◽

Biogas Production ◽

Calorific Value ◽

Electrical Energy ◽

Biological Sludge ◽

Calorific Power

This study compares the calorific power of biogas obtained from the municipal solid waste (MSW)of two towns in Colombia,whose populations are affected by deficiencies in the supply of electricity. The production of biogas would represent an importantopportunity to meet these needs, taking advantage of the solid waste generated, in whose composition organic material predominates(45 %). For this purpose, MSW samples were taken from the municipalities of Mitú (Vaupés) and Sibundoy (Putumayo), in orderto establish their relevance to produce biogas. For each sample, the organic waste was characterized in terms of its macroscopiccomposition, moisture content, ash, volatile and total solids. Subsequently, the composition of biogas obtained was determinedfrom anaerobic digestion tests with biological sludge as inoculum in different proportions and the calorific value of the gas wascalculated. It was found that organic waste from both municipalities is suitable to produce biogas due to the physicochemicalcharacteristics of the samples, the high methane content generated and, therefore, the satisfactory calorific power for its use in theproduction of electrical energy.

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Pelletization of Refuse-Derived Fuel with Varying Compositions of Plastic, Paper, Organic and Wood

Sustainability ◽

10.3390/su12114645 ◽

2020 ◽

Vol 12 (11) ◽

pp. 4645

Author(s):

Hamid Rezaei ◽

Fahimeh Yazdan Panah ◽

C. Jim Lim ◽

Shahab Sokhansanj

Keyword(s):

Moisture Content ◽

Municipal Solid Waste ◽

Solid Waste ◽

Calorific Value ◽

Displacement Curve ◽

Efficient Treatment ◽

Refuse Derived Fuel ◽

Mass Fractions ◽

Die Temperature ◽

Plastic Content

The combustible fraction of municipal solid waste (MSW) is called refuse-derived fuel (RDF). RDF is a blend of heterogeneous materials and thus its handling is challenging. Pelletization is an efficient treatment to minimize the heterogeneity. In this research, typical RDF compositions were prepared by mixing several mass fractions of paper, plastic, household organic and wood. The collected compositions were ground, wetted to 20% moisture content (wet basis) and pelletized. Increasing the plastic content from 20% to 40% reduced the pelletization energy but increased the pellet’s calorific value. Pellets with higher plastic content generated more dust when exposed to shaking. Making durable pellets with 40% plastic content needed an increase in die temperature from 80 °C to 100 °C. Increasing the paper content from 30% to 50% increased the durability but consumed higher energy to form pellets. Paper particles increased the friction between pellet’s surface and die wall as was evident from expulsion energy. Force versus displacement curve for material compression revealed that the RDF compositions have rigid material characteristics.

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Comparative Biodrying Performance of Municipal Solid Waste in the Reactor under Greenhouse and Non-greenhouse Conditions

Journal of Environmental Treatment Techniques ◽

10.47277/jett/9(1)217 ◽

2020 ◽

Vol 9 (1) ◽

pp. 211-217

Keyword(s):

Moisture Content ◽

Municipal Solid Waste ◽

Solid Waste ◽

Energy Content ◽

Pilot Scale ◽

Aeration Rate ◽

Operating Conditions ◽

Airflow Rate ◽

Greenhouse Condition ◽

Drying Time

The high moisture content of municipal solid waste yields a lower energy content of solid fuel that affects the thermal conversion efficiency. Biodrying is an alternative drying method using bio-heat generated by microbial metabolism to reduce the moisture content of municipal solid waste. This research was conducted in three pilot-scale biodrying reactors, two under greenhouse conditions compared with one conventional non-greenhouse condition. Two bunkers with greenhouse cladding were connected with aerators, and airflow rates were set at 0.4 and 0.6 m3/(kgwaste·day), respectively. Meanwhile, a passive aeration method was applied to the non-greenhouse bunker. This study aims to investigate the effect of the greenhouse condition on the biodrying process and assess the performance of the drying process through different operating conditions. The result shows that the greenhouse mainly affects the air temperature rise in the reactor. The aeration rate is positively correlated with weight reduction (r = 0.93). At 0.6 m3/(kgwaste·day) airflow rate, the treatment can reach a moisture content less than 30% on average within ten days, while at 0.4 m3/(kgwaste·day) airflow rate, it takes 15 days to reduce the moisture content to less than 30%. Biodrying under the greenhouse condition with active aeration potentially achieves desirable moisture content reduction and heating value increase more efficiently than the common biodrying. However, the airflow rate is a crucial factor in determining the suitable drying time in biodrying under the greenhouse condition.

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