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# Heavy Metal Removal in a Packed-Bed, Anaerobic Upflow (ANFLOW) Bioreactor

A. L. Rivera
Journal (Water Pollution Control Federation)
Vol. 55, No. 12 (Dec., 1983), pp. 1450-1456
Stable URL: http://www.jstor.org/stable/25042128
Page Count: 7
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## Abstract

An experimental program was developed in which zinc (as ${\rm ZnCl}_{2}$) complexed by sodium citrate was introduced as step functions containing concentrations of 100 mg/L soluble zinc for a period of 35 days, 300 mg/L for 26 days, and 1000 mg/L for 13 days. The system was monitored for soluble zinc removal, sorption into biosolids, and bioreactor performance in terms of soluble chemical oxygen demand (COD) removal. Heavy metal removal in an ANFLOW bioreactor is similar to an ion exchange process, where a saturation transient begins at the bottom of the column and moves upward. Inhibition as measured by a decrease in COD removal was associated with heavy metal sorption. This sorption phenomenon could be described by a Freundlich-type equation of the form ${\rm S}F_{T}=K_{F}C^{l/n}$, where $K_{F}$ and l/n were 5.92 and 0.56, respectively.

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