Fe_(3)O_(4) NP强化高浓度厨余有机废水厌氧降解的探究

Enhancement of Anaerobic Degradation of High Concentration Organic Kitchen Wastewater By Fe_(3)O_(4) NP

为探究纳米四氧化三铁(Fe_(3)O_(4) NP)对高浓度厨余废水有机物降解效能的影响,构建了上流式厌氧污泥床反应器(UASB),在中温条件下分析了不同有机负荷影响下Fe_(3)O_(4) NP对厨余垃圾废水处理效能的影响。结果表明,Fe_(3)O_(4) NP促进了有机物降解,并提高了甲烷产率,促进了挥发性脂肪酸(VFA)的转化。在OLR为8.0 kg/(m3·d)时,投加Fe_(3)O_(4) NP组别,COD去除效率高达90.2%,甲烷产率为224.3 mL/g,高于未投加Fe_(3)O_(4) NP组别,而VFA的最大积累量仅为90.2 mg/L。此外,Fe_(3)O_(4) NP能影响厌氧污泥性质,提高污泥粒径,促进胞外聚合物的产生,蛋白质(PN)和多糖(PS)最大质量含量分别为116.2 mg/g和124.3 mg/g,ω(PN)/ω(PS)升高至0.93。Fe_(3)O_(4) NP促进了UASB内污泥絮凝与颗粒化。研究结果为处理高浓度厨余垃圾废水提供了一定数据支撑与理论依据。

To explore the effect of nano ferric oxide(Fe_(3)O_(4) NP)on the degradation efficiency of organic matter in high concentration kitchen wastewater,an Up-flow Anaerobic Sludge Bed(UASB)was constructed.The effect of Fe_(3)O_(4) NP on the treatment efficiency of kitchen wastewater under different organic load rates was analyzed at medium temperature.The results showed that Fe_(3)O_(4) NP promoted the degradation of organic compounds,increased the yield of methane and promoted the conversion of volatile fatty acids(VFA).When the OLR was 8.0 kg/(m3·d),the COD removal efficiency was as high as 90.2%with adding Fe_(3)O_(4) NP,and the methane yield was 224.3 mL/g,which was higher than that of the group without Fe_(3)O_(4) NP,while the maximum accumulation of VFA was only 90.2 mg/L.In addition,Fe_(3)O_(4) NP can affect the properties of anaerobic sludge,improve sludge particle size and promote the production of extracellular polymers.The maximum mass concentrations of protein(PN)and polysaccharide(PS)were 116.2 mg/g and 124.3 mg/g respectively,andω(PN)/ω(PS)rose to 0.93.Fe_(3)O_(4) NP promoted sludge flocculation and granulation in UASB.The results of this study provide some data support and the theoretical basis for the treatment of high concentration kitchen wastewater.