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Biosludge Drying: System Design Schemes for the Sticky Phase

By Yen-Hsuing Kiang, Xiamen Baipeng Environmental Engineering Co. |

Drying biosludge from wastewater-treatment plants is complicated by the “sticky phase,” making the practice more of an art than a science. Discussed here are efforts to define the beginning and endpoints of this phase analytically The drying of biosludge from a wastewater-treatment plant (WWTP) is not an easy task. The most troublesome problem during biosludge drying is caused by the so-called sticky phase of the biosludge. This phase is characterized as a partially dewatered, paste-like material that adheres to the surface of the drying equipment. Mostly because of the difficulties associated with handling the sticky phase, the drying of biosludge is currently thought of as somewhat more of an art than a science. This article represents an effort to move this drying activity further into the realm of science, by developing an analytical approach to defining the beginning and ending solid concentrations for the sticky phase zone of biosludge. By using laboratory test data from a previous article on this topic (Chem. Eng., September 2014, pp. 51–54) as an example, this article presents design schemes for biosludge drying that can make use of these predicted beginning and ending concentrations of the sticky phase zone. Armed…
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