Chemical and physical pretreatment of ATAD biosolids for dewatering

Chemical and physical pretreatment of ATAD biosolids for dewatering

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Article ID: iaor2004599
Country: United States
Volume: 44
Issue: 10
Start Page Number: 309
End Page Number: 314
Publication Date: Jan 2001
Journal: Water Science and Technology
Authors: , ,
Keywords: geography & environment
Abstract:

This paper reports on two modifications to the typical practice of polymer conditioning intended to enhance the dewaterability of autothermal thermophilic aerobic digested (ATAD) biosolids. Our modification was a chemical pretreatment, using ferric chloride prior to polymer conditioning, and the other was a physical pretreatment using an electrical arc technology before polymer addition. These modifications were evaluated separately and in combination, in laboratory conditioning experiments using ATAD biosolids. Results showed that neither ferric chloride nor the arc treatment is sufficient to produce dewaterable biosolids without the use of polymer. However, use of a ferric chloride dose as low as 100 g per kg of dry solids reduced the polymer requirement by about 50%. The arc treatment provided further enhancement of dewaterability, but the observed benefits might not justify its use without further optimization. For this purpose, additional methods were utilized to assist in understanding the pretreatment mechanisms.

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