The Bio-remediation Technology of Organophosphorus Pesticides Contaminated Soil

Abstract

In order to increase the degradation efficiency of chlorpyrifos pesticides in soil, a organ phosphorous degrading condition was optimized for a compound microbial agent which composed of a high-performance microbial and unninghamella. Orthogonal design table was used to select soil moisture, pH, chlorpyrifos concentration and compound microbial agents inoculation amount as reference factors in potted plants. The results of the orthogonal design analysis indicated that optimal chlorpyrifos degradation condition for this compound agent was soil moisture 40%, pH 7.3, chlorpyrifos concentration and microbial agent inoculation amount 100 µgmg-1 and 200mlkg-1.Temperture target analysis demonstrated that this compound agent had a broader temperature tolerance, it could carry out the degradation of chlorpyrifos at temperature 20-35°C, which 30°C was the most suitable temperature for the agents. Analysis of extreme differences indicated that soil pH had the maximum influence on the chlorpyrifos in the soil. Other factors affecting the chlorpyrifos degeneration followed as soil moist > inoculation amount > chlorpyrifos concentration.