CONVERSION OF MUNICIPAL INCINERATOR RESIDUE INTO AN ECONOMICALLY ATTRACTIVE PRODUCT

A SIMPLE AND ECONOMICAL PROCESS IS DESCRIBED FOR DENSIFYING AND CONVERTING MUNICIPAL INCINERATOR RESIDUE INTO USEFUL AGGREGATE PRODUCT. INCINERATOR RESIDUE IS GROUND WITH A HAMMERMILL, BURNED-OUT AT A TEMPERATURE BELOW 1,270 DEGS F USING A ROTARY FURNACE, THEN MELTED AND FUSED AT 1,900 - 2,000 DEG F ON THE TOP OF A VERTICAL SELF SUPPORTED COLUMN OF PRODUCT. THE COLUMN IS CONTINUOUSLY WITHDRAWN THROUGH THE BOTTOM OF THE FUSION FURNACE AND IMMEDIATELY COOLED IN AIR TO ARREST FLOW, THEN CUT INTO SECTIONS AND FURTHER COOLED IN AIR BEFORE BEING FINALLY CRUSHED INTO DESIRED AGGREGATE SIZES. THE FULL-SCALE PROCESS IS COMPACT AND COULD BE ADDED TO THE 300 EXISTING INCINERATOR PLANTS AS WELL AS TO PROJECTED NEW FACILITIES. THE CAPITAL COST FOR A UNIT CAPABLE OF HANDLING THE ENTIRE RESIDUE OUTPUT OF A TYPICAL 600 TON/DAY MUNICIPAL REFUSE INCINERATOR WOULD BE APPROXIMATELY $300,000. THE MAJOR OPERATING COSTS ARE AS FOLLOWS: LABOR 37 PERCENT; AND CAPITAL EXPENSES 25 PERCENT (INCLUDES INTEREST CHARGES AT 7.5 PERCENT OVER A 15-YEAR PERIOD). THE MILL COST FOR PRODUCING AGGREGATE FROM RESIDUE IS ABOUT $4 PER TON WITH UNINTERRUPTED 24 HOUR A DAY OPERATION. ECONOMIC STUDIES SHOW THAT AT A PRODUCTION COST OF $7/TON, THE AGGREGATE PRODUCT IS CURRENTLY COMPETITIVE IN PRICE WITH THE LOWEST COST NATURAL AGGREGATE MATERIALS USED IN LARGE CITIES. ECONOMIC AND ENVIRONMENTAL BENEFITS THAT WOULD ACCRUE ON ADOPTION OF THIS METHOD ARE DISCUSSED. SCHEMATIC DIAGRAMS ARE PRESENTED OF THE RESIDUE DENSIFICATION PROCESS AND THE RESIDUE FUSION FURNACE. DENSITY AND FRIABILITY DATA ARE TABULATED.

• Supplemental Notes:
  • GRANT NO EC00326-02
• Corporate Authors:

  American Association of State Highway and Transportation Officials (AASHTO)

  444 North Capitol Street, NW
  Washington, DC  United States  20001
• Authors:
  • Pindzola, D
  • Morgan, P E
  • Knight, D
  • Janoff, M S
• Conference:
  • American Assn of State Hwy & Transp Office Proc
• Publication Date: 1971-12

Media Info

• Features: Figures; References; Tables;
• Pagination: 11 p.

Subject/Index Terms

• TRT Terms: Aggregates; Costs; Economic benefits; Incinerators; Solid wastes; Urban areas; Waste disposal
• Uncontrolled Terms: Cost data
• Subject Areas: Economics; Finance; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00217355
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 16 1974 12:00AM