Optimizing Dewatering of Biosolids from Autothermal Thermophilic Aerobic Digesters (ATAD) Using Inorganic Conditioners

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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.
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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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