Shredded solids

FIG. 20-60 Hammer wear as a consequence of shredding municipal solid waste. Sa-oage and Diaz, Proceedings ASME National Waste Processing Conference, Denver, CO, 361-373, 1986.)... 

Attempted Hydrolysis of S-b-MM with KOH. A solution of S-b-MM-90/10-wt (1.50 g, 1.5 meq MM) in 1 9 water-THF (50 mL) was treated with KOH (1.57 g, 28.0 mmol), and the mixture was refluxed for 47 hr. The solvents were evaporated, and the residue was shredded in a blender containing 200 mL of water. The solids were filtered, washed with water and methanol, and dried. The dried polymer was dissolved in dichloromethane and precipitated from methanol. The precipitate was washed with methanol and dried in a vacuum oven, yielding 1.23 g of product. Both 1H NMR and IR indicate essentially unreacted S-b-MM. 

Shredded circuit boards. Circuit boards are metal boards that hold computer chips, thermostats, batteries, and other electronic components. Circuit boards can be found in computers, televisions, radios, and other electronic equipment. When this equipment is thrown away, these boards can be removed and recycled. Whole circuit boards meet the definition of scrap metal, and are therefore exempt from hazardous waste regulation when recycled. On the other hand, some recycling processes involve shredding the board. Such shredded boards do not meet the exclusion for recycled scrap metal. In order to facilitate the recycling of such materials, U.S. EPA excluded recycled shredded circuit boards from the definition of solid waste, provided that they are stored in containers sufficient to prevent release to the environment, and are free of potentially dangerous components, such as mercury switches, mercury relays, nickel-cadmium batteries, and lithium batteries. 

Cotton linters or wood pulp, usually in the form of sheets, is steeped in strong alkali (18-50%). The swollen sheets are then pressed to force out most of the excess alkali solution. This alkali cellulose is then shredded, and aged if low viscosity is desired. The aging process is the one followed in the viscose industry and is fully explained in any discussion of that process. More alkali may be introduced during the shredding, either as a concentrated solution or as solid alkali.18 The alkali... 

Debatox A rotary kiln system for recycling consumer battery materials developed by Sulzer Chemtech. The system first shreds the batteries and then incinerates them. Carbon, plastics, and paper are burnt. Dioxins are destroyed in an afterburner, and mercury is condensed in a scrubber. The residual solids, containing zinc, manganese, and iron, can be recycled by standard smelters. 

Preventing the segregation of the carbon-carrier medium and shredded DPE suit material and wood dunnage in the solids feed to the CST to... 

MD M28 rocket propellant and burster hydrolysates slurried with shredded and micronized dunnage that has had the hydrolyzed aluminum removed by filtration. These tests included the results of aluminum filtration tests. This test also demonstrated a modified chemistry for controlling solids transport through the reactor without the use of an additive that degrades the titanium reactor material. 

Step 2 of the GATS process is the separation, shredding, and grinding of the dunnage and other nonprocess waste until all solid material is reduced to granules less than 1 mm in size. These powdered solids are then mixed with energetics hydrolysate and other liquid wastes in a hydropulper to create a slurry to feed to the SCWO reactor. 

Ascertain how well die SCWO process can handle high-solids materials (shredded dunnage). 

The Union Carbide Purox system (17) uses municipal solid waste as the feed. Shredded ferrous-free refuse enters the top of the conversion furnace and is contacted countercurrently with hot combustion gases from the reaction occurring in the hearth. 

Some radioactive metals (e.g., cesium) are highly volatile under Q-CEP operating conditions. Predrying may be required for liquids with high water contents. Solids may require shredding or milling prior to treatment. Extensive treatment of off-gases is required. 

Solid waste must be within a range of 5 p.m to 2 inches to be treated by the Shirco technology. Large bulk objects must be shredded to this size prior to treatment. 

Waste Recovery, Inc. (WRI) shreds tires for fuel at installations in Pordand, Oregon Adanta, Geoigia Marsflles and Du Po, Illinois Conshohoda, Pennsylvania and Houston, Texas. Goodyear owns 10% of WRI. Firestone bums rejected tires in addition to other solid wastes. 

Fill the blender three-fourths full of warm water. Turn on low speed and slowly add 1 cup of the shredded material.There should always be much more water in the blender than solid matter Blend the material to a fine pulp. 

Bark removal also can be accomplished by use of a ring barker or hydraulic barkers which employ high-pressure water jets for bark stripping. Bark removed is collected, shredded in a hog or hammer mill, and used as fuel in steam boilers, where it contributes about 3863 kJ/kg (9000 Btu/ponnd) of dry solids. 

The energy recovery system selected dictates the extent that solid waste must be prepared. Some systems require nothing more than the removal of massive noncombustibles, such as kitchen appliances from the refuse, while other processes require extensive shredding, air classification, reshredding, and drying, In conjunction with fuel preparation, it is usually worthwhile to reclaim metals and glass for recycling. 

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