Optimizing Dewatering of Biosolids from Autothermal Thermophilic Aerobic Digesters (ATAD) Using Inorganic Conditioners
Abstract:Biosolids obtained through the autothermal thermophilic aerobic digestion (ATAD) process exhibit greater polymer demand for dewatering than those obtained through conventional mesophilic aerobic digestion processes. An increase in ATAD retention time and operating temperature resulted in an increase in proteins and polysaccharides in solution, and this resulted in a corresponding increase in cationic polymer demand and an increase in dewatered cake filtrate chemical oxygen demand (COD). Alternative chemical conditioners were used to minimize polymer consumption. Coagulation of solution phase biological polymers (proteins and polysaccharides) using ferric chloride or alum was extremely effective in reducing cationic polymer conditioning demand and dewatered cake filtrate COD. Ferric chloride and alum in laboratory experiments were also able to precipitate and remove phosphate, thus preventing its recycle to the influent of the plant.
Document Type: Research Article
Publication date: November 1, 2000
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