氧化乐果在绿化废弃物厌氧发酵过程中的降解

目的]研究厌氧消化方法促进有机磷农药降解的可行性。方法]采用城市园林绿化废弃物作为发酵底料,同时向厌氧消化系统中滴加有机磷农药——氧化乐果,采用气象色谱仪检测发酵系统中农药的浓度。结果]厌氧消化系统内农药的浓度越低,其降解速度越快;在厌氧消化系统负荷下,140 mg/L氧化乐果是该系统能够消解的极限。氧化乐果浓度达到60 mg/L以上时,逐渐开始出现对厌氧消化系统产沼气的抑制作用,系统的产沼气能力降低,氧化乐果浓度在100 mg/L以上时对产气造成了严重抑制。随着反应的进行,pH稳步升高,最终稳定在6.5~7.3,该pH适宜于甲烷的生长。结论]利用城市绿化废弃物发酵降解有机磷农药是可行的。

Experiment on Degradation of Omethoate in Green Waste Anaerobic Degradation System

Objective] To study the feasibility of anaerobic digestion to promote the degradation of organophosphorus pesticides.Method] Platanus leaves were used as raw materials for anaerobic digestion.Omethoate was dropped into the fermentation system.Gas chromatography was used to detect the concentration of the pesticides in the fermentation system.Result] The result showed that the lower the concentration of pesticide in anaerobic digestion system,the faster the degradation rate.Under the load of anaerobic digestion system set up by experiment,the 140 mg/L of dimethoate was the limit of this system.At the omethoate concentration of 60 mg/L,there began to appear the biogas production inhibition,and when the omethoate concentration was over 100 mg/L,the inhibition became extremely serious.With the reaction,pH steadily increased and finally stabilized at 6.5-7.3.The pH was suitable for the growth of methanogens.Conclusion] It is feasible to use urban greening waste to ferment and degrade organophosphorus pesticides.