engleski

Applicability of the large pycnometer method for determination of specific gravity of mechanically and biologically treated waste

In this paper authors presented results of specific gravity of fine fraction of mechanically and biologically treated (MBT) waste material. The water pycnometer procedure was adapted from BS 1377: Part 2: 1990 standard for determination of particle density with a simple Large water pycnometer (LWP) method. To prevent floating of the light mass components (e.g. plastics, Styrofoam, cardboard), a mechanical bridging (aluminum screen) was placed into the bottom of a conical screw cap. The results of specific gravity of fine fraction of tested waste material varied in range from 1.35 to 1.77. In order to examine the accuracy of the water pycnometer method, a series of tests were conducted on a sand specimen with a known specific gravity. In spite its simplicity, the method proved to be fairly accurate for sandy specimens with “only” a 3.3% error, whereas for waste specimens the LWP method has proven to be unreliable with 18.19% error with respect to the reference point. As a referent value for waste, results of specific gravity determined with gas pycnometer were used. The arithmetic mean value of measured specific gravity of waste specimens with gas pycnometer method was 1.88.

MBT waste ; specific gravity ; biodried waste

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