Management and disposal of water treatment plant
residuals have become more expensive and complicated
because of numerous federal, state, and local
guidelines and regulations. This research sought to develop
physical and engineering quality data on plant residuals and
to investigate the feasibility of using dewatered residuals as
sanitary landfill cover.
Testing was conducted to determine the physical and engineering
properties of alum-coagulated residuals from two water
suppliers in Arlington, Texas. The residuals had fine particle size
distribution, high specific resistance, high plasticity index, low
dry unit weight, and low shear strength - properties that rendered
them unsuitable for landfill cover application. However,
blending the residuals with natural topsoil improved the physical
properties of the residuals to such a level that the mixture could
be used for landfill cover. Of the proportions tested, a blend of
20% residuals and 80% natural soil resulted in the optimum
moisture content, maximum dry unit weight, and a plastic limit
within the workable range.
The numerous regulations governing residual disposal can
drive up costs and limit options. This study offers utility managers
a beneficial application for residual disposal rather than disposing
of residuals in landfills as a waste product or discharging them
into wastewater sewer lines. Includes 16 references, tables, figures.
| Edition : | Vol. 95 - No. 8 |
| File Size : | 1
file
, 280 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 08/01/2003 |
