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Most biosolids in the USA are recycled via agricultural land application. In several states, including California, this practice is under attack as being unsafe. Some agencies are seeking technologies, like thermal drying, to produce a more acceptable Class A product. While drying does produce a fine marketable product that can be used as fertilizer or fuel, it is expensive to evaporate water from biosolids containing 20%-25% total solids.

EnerTech's SlurryCarb™ process heats biosolids under pressure to improve its dewaterability significantly and increase the cake solids fed to the dryer to 50% total solids; thus, the amount of thermal energy needed to dry the biosolids is reduced by about two-thirds and the cost by about one-third.

The dried product from EnerTech's first commercial facility in Rialto, California will be used as a renewable fuel in lieu of coal in a cement kiln. This unique beneficial use lowers green house gas emissions, reduces ore consumption, leaves no residue for disposal, provides permanent recycling of the biosolids, and eliminates all the health and environmental concerns associated with agricultural use.
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Document Type: Research Article

Publication date: 2006-01-01

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