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- W1552697614 abstract "Pesticides are chemical substances intended to prot ect food crops and livestock from pests in order to promote agricultural productivity and protect public h ealth. Contamination of soil, air and water and thr eat to human and animal health are the major constraints i n the use of pesticides. Treatment of pesticide con taminated water is, therefore, paramount. Biological tr eatment provides the most economical option when compared to other treatment methods. The aim of the st udy was to develop a safe and effective in the farm biological treatment for low level agricultural pestic ide wastewater. The degradation of the fungicide ca ptan was evaluated under batch and continuous modes of operation with a retention time of 15 days. The init ial cell number (30.1 ×10 6 cells/mL) in the soil water mixture first declined with time during the 24 h reaching 15.6 ×10 6 and 11.1 ×10 6 cells/mL in the batch and continuous bioreactors, respectively. This was due to the inhibitory effect of pesticide on some of the soil microbial species that had less tolerance to captan at the initial concentration of 144 mg L -1 . Then, the microbial population started growing, r eaching its maximum after 5 and 12 days from the start in the batch and continuous bioreactors, respectively. The lag peri od and the specific growth rate for the batch bioreactor w ere 22 h and 0.096 h -1 , respectively. A captan degradation efficiency of 89.6% was achieved after 10 days in t he continuous bioreactor compared to a degradation efficiency of 100% after 5 d in the batch bioreactor. T his study showed that the effluent from the continu ous bioreactor has a captan concentration of 12 mg L -1 which is not acceptable for livestock water accord ing to Health Canada Guidelines. A half life of 52 h is ob served in the batch bioreactor." @default.
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- W1552697614 date "2012-04-01" @default.
- W1552697614 modified "2023-09-27" @default.
- W1552697614 title "KINETICS OF BIOLOGICAL TREATMENT OF LOW LEVEL PESTICIDE WASTEWATER" @default.
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- W1552697614 doi "https://doi.org/10.3844/ajessp.2012.424.432" @default.
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