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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Biological cyanide degradation in aerobic fluidized bed reactors : treatment of almond seed wastewater
Authors: Petrozzi, Sergio
Dunn, Irving J.
DOI: 10.21256/zhaw-4204
Published in: Bioprocess and Biosystems Engineering
Volume(Issue): 11
Issue: 1
Pages: 29
Pages to: 38
Issue Date: 1994
Publisher / Ed. Institution: Springer
ISSN: 1615-7591
Language: English
Subjects: Cyanide; Activate sludge; Hydraulic retention time; Amygdalin; Soil slurry
Subject (DDC): 572: Biochemistry
Abstract: The continuous aerobic transformation of synthetic cyanide waste-water, amygdalin solutions and almond seed extract containing cyanide was investigated in several fluidized bed reactors. Various inocula consisting of activated sludge or soil slurry were used. Successful inoculation was achieved with simple soil slurry. No significant influence was found between the performance of the systems inoculated with a cyanide contaminated soil and a garden soil. The performance and stability of the reactors with respect to degradation rate were tested for a range of cyanide loading conditions, with feed containing only cyanide, and with different additional carbon sources, as well as various C∶N ratios at a hydraulic retention time of 24 h. No growth with cyanide as the sole source of carbon and nitrogen was observed. The system with lactate as the organic C-source was capable of operating at cyanide concentrations of 160 ppm cyanide with a conversion rate of 0.125 kg cyanide/m3 d. Ammonia was the end product and the effluent concentration was 0.5 ppm CN-. The systems with ethanol as the organic C-source could degrade only 0.05 kg cyanide/m3 d, whose feed concentration was 60 ppm cyanide. Amygdalin, an organic cyanide-containing compound present in stone fruit seeds, was fed as a model substrate. Degradation rates up to 1.2 kg COD/m3 d could be measured with no free or organically bound cyanide in the effluent. These rates were limited by oxygen transfer, owing to the large amount of degradable COD. The further investigations with almond seed extracts, confirmed the applicability of the aerobic process to treat food-processing waste streams having low concentrations of cyanide with high COD content.
Further description: Erworben im Rahmen der Schweizer Nationallizenzen (
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: Life Sciences and Facility Management
Appears in Collections:Publikationen Life Sciences und Facility Management

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