氧化乐果在绿化废弃物厌氧发酵过程中的降解

Experiment on Degradation of Omethoate in Green Waste Anaerobic Degradation System

[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。

[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,the140 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.