Field Capacity The field capacity of solid waste is the total amount of moisture that can be retained in a waste sample sIs or cr formation hate in landfills. Water in excess of the field capacity will be eleased as leachate. The field capacity varies with the degree of applied pressure and the state of decomposition of the waste. A field capacity of 30 percent by volume corresponds to 30 in/100 in. The field capacity of uncompacted commingled wastes from residential and commercial sources is in the range of 50 to 60 percent 4- 2 Chemical properties of MSW Information on the chemical composition of the components that constitute MSw portant in evaluating alternative processing and recovery options. For example, the feasibility bustion depends on the chemical cor ition of the solid wastes. Typically, wastes can be thought of as a combination of semimoist combustible and noncombustible materials. If solid wastes are to be used as fuel, the four most important properties to be known are I Proximate analysis Fusing point of ash 3. Ultimate analysis(major elements) 4. Energy content Where the organic fraction of MSW is to be composted or is to be used as feedstock for the production of other biological conversion products, not only will information on the major elements(ultimate analysis) that compose the waste be important, but also information will be required on the trace elements in the waste materials Proximate Analysis Proximate analysis for the combustible components of MSw includes the following tests 1. Moisture(loss of moisture when heated to 105C for 1 h) 2. Volatile combustible matter(additional loss of weight on ignition at 950%C in a covered crucible) 3. Fixed carbon(combustible residue left after volatile matter is removed) 4. Ash(weight of residue after combustion in an open crucible Fusing point fash waste wilT form a solid(clinker) by fusion and agglomeration Typical fusing temperatures for,of The fusing point of ash is denned as that temperature at which the ash resulting from the burr formation of clinker from solid waste range from 2000 to 2200.F(1100 to 1200C) Tab 14-I Typical proximate analysis and energy data for materials found in residential, commercial, and industrial solid Proximate analysis, % by weight Energy content, Btu/b Type of waste Moisture matter Dry ash-free Food wastes(mixed) Fruit wastes 1,707 Meat wastes 56.4 23 7428 Waxed cartons 909 45 2.0 2222 11204 Polyvinyl chloride Textiles. rubber leather 18:21.2 14-214-2 Field Capacity The field capacity of solid waste is the total amount of moisture that can be retained in a waste sample subject to the downward pull of gravity. The field capacity of waste materials is of critical importance in determining the formation of leachate in landfills. Water in excess of the field capacity will be released as leachate. The field capacity varies with the degree of applied pressure and the state of decomposition of the waste. A field capacity of 30 percent by volume corresponds to 30 in/100 in. The field capacity of uncompacted commingled wastes from residential and commercial sources is in the range of 50 to 60 percent. 14- 2 Chemical properties of MSW Information on the chemical composition of the components that constitute MSW is important in evaluating alternative processing and recovery options. For example, the feasibility of combustion depends on the chemical composition of the solid wastes. Typically, wastes can be thought of as a combination of semimoist combustible and noncombustible materials. If solid wastes are to be used as fuel, the four most important properties to be known are: 1. Proximate analysis 2. Fusing point of ash 3. Ultimate analysis (major elements) 4. Energy content Where the organic fraction of MSW is to be composted or is to be used as feedstock for the production of other biological conversion products, not only will information on the major elements (ultimate analysis) that compose the waste be important, but also information will be required on the trace elements in the waste materials. Proximate Analysis Proximate analysis for the combustible components of MSW includes the following tests : 1. Moisture (loss of moisture when heated to 105°C for 1 h) 2. Volatile combustible matter (additional loss of weight on ignition at 950°C in a covered crucible) 3. Fixed carbon (combustible residue left after volatile matter is removed) 4. Ash (weight of residue after combustion in an open crucible) Fusing Point of Ash The fusing point of ash is denned as that temperature at which the ash resulting from the burning of waste will form a solid (clinker) by fusion and agglomeration. Typical fusing temperatures for the formation of clinker from solid waste range from 2000 to 2200°F (1100 to 1200°C). Tab 14-1