The capabilities of spent mushroom compost microorganisms in degrading carbaryl and 1-naphthol were evaluated. No lag phases were observed for the two compounds. The microbial degradation kinetics of the two compounds could be interpreted very well by Pseudo-first-order model. The biodegradation rate constants of two compounds were affected by initial biomass concentration and aeration rate significantly. The rate constants of carbaryl and 1-naphthol were 0.2S1 hr−1, 0.105 hr−1 respectively under the aerobic condition (aeration rate 600 ml/min and initial biomass concentration 100 mg/l). Thus, the half-life of carbaryl and 1-naphthol were 2.761 hrs, 6.600 hrs respectively.

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