a College of Mechanical Engineering , Guangxi University , Nanning , China.
b Key Laboratory of Guangxi Petrochemical Resource Processing and Process Intensification Technology , Nanning , China.
J Environ Sci Health B. 2019;54(6):449-458. doi: 10.1080/03601234.2019.1592639. Epub 2019 Apr 2.
Fipronil is a broad-spectrum insecticide that has a good control effect on pests of commercial poultry. Although many studies have reported the environmental fate of fipronil, the influence of residual fipronil in poultry waste on biogas production has not been further explored yet. In this article, an experimental comparative study on anaerobic digestion (AD) of chicken manure (CM) and corn straw (CS) with different fipronil concentrations (FCs) was carried at 8% of total solid (TS) and mid-temperature (35 ± 1)°C. The results showed that fipronil had a significant effect on biogas production during AD of CM and CS. When the FC is at a low level (≤10 mg·kg), the biogas production rate is increased and the digestion period was shortened, while higher FC (≥ 20 mg·kg) showed an inhibitory effect. During the monitoring of enzyme activity, low FC showed no significant effect on cellulase and saccharase, but the urease activity increased in the early stage. High FC showed inhibition of activity of cellulase and urease, but the saccharase activity was significantly inhibited until FC reached 40 mg·kg. This study also confirms that the environment in anaerobic digester is favorable for the degradation of fipronil, and its half-life is about 15.83 days.
氟虫腈是一种广谱杀虫剂，对商业家禽的害虫有很好的防治效果。尽管许多研究已经报道了氟虫腈的环境归宿，但残留氟虫腈对家禽粪便生物制沼气的影响尚未得到进一步探讨。本文在总固体（TS）为 8%和中温（35±1）℃的条件下，对不同氟虫腈浓度（FCs）的鸡粪（CM）和玉米秸秆（CS）的厌氧消化（AD）进行了实验性对比研究。结果表明，氟虫腈对 CM 和 CS 的 AD 过程中的沼气产量有显著影响。当 FC 处于低水平（≤10mg·kg）时，沼气产生率增加，消化时间缩短，而较高的 FC（≥20mg·kg）则表现出抑制作用。在监测酶活性时，低 FC 对纤维素酶和糖化酶没有显著影响，但在早期阶段，脲酶活性增加。高 FC 对纤维素酶和脲酶的活性表现出抑制作用，但糖化酶的活性在 FC 达到 40mg·kg 时显著受到抑制。本研究还证实，厌氧消化器中的环境有利于氟虫腈的降解，其半衰期约为 15.83 天。
