Drying and gas or vapor contact with solids – Process – With contacting of material treated with solid or liquid agent
Patent
1992-12-21
1994-10-18
Bennet, Henry A.
Drying and gas or vapor contact with solids
Process
With contacting of material treated with solid or liquid agent
34 95, F26B 300
Patent
active
053555945
ABSTRACT:
A method of maximizing net water loss from various sludges in the outdoor environment to stabilize or to reduce the volume and weight of sludges. Specifically, this method comprises drying a layer of wet sludge by surface evaporation, mixing a sufficient amount of additional wet sludge to the previously-dried sludge layer to form a sludge mixture having a water content at which surface evaporation is maximized, and drying the sludge mixture by surface evaporation or by periodical tilling or both. Additionally, the sludge surface is sealed by light compaction in the event of imminent precipitation to minimize rainwater retention and infiltration. In addition to stabilization, this method may be used as an effective pretreatment step towards other sludge treatment processes to drastically reduce the sludge treatment cost, based on the reduction of the sludge volume, sludge weight, and sludge water content.
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