Use of a field-scale biofilter for the degradation of the organophosphate insecticide coumaphos in cattle dip wastes
✍ Scribed by Mulbry, Walter; Ahrens, Elmer; Karns, Jeffrey
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 437 KB
- Volume
- 52
- Category
- Article
- ISSN
- 1526-498X
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✦ Synopsis
Insecticide wastes generated from livestock dipping operations are well suited for biodegradation processes since these wastes are concentrated, contained, and have no other signiÐcant toxic components. A Ðeld-scale bioÐlter capable of treating 15 000-litre batches of dip waste containing the acaricide coumaphos was used to reduce the coumaphos concentration in two successive 11 000-litre batch trials from 2000 mg litre~1 to 10 mg litre~1 in approximately 14 days at 25È29¡C. Removal of coumaphos from the bioÐlter effluent is a function of both physical Ðltration and biodegradation by the bioÐlter. However, stoichiometric increases in chloride levels in the effluent as coumaphos concentrations decreased conÐrmed that coumaphos was being degraded by the bio-Ðlter rather than just being Ðltered out. In subsequent 5500-litre batch experiments, the addition of a vitamin supplement to the bioÐlter-treated dip resulted in a further decrease in coumaphos concentration to approximately 1 mg litre~1. Results from incubations of two representative Texas soils with bioÐlter-treated dip spiked with [benzo-U-14C] coumaphos revealed that 32È36% of the spiked [14C] coumaphos was mineralized in the soils after 110 days at 30¡C. 1998 SCI.