AnMBR处理高脂肪废水的运行特性和污泥性质研究

Operation Characteristics and Sludge Properties of the Anaerobic Membrane Bioreactor Treating Lipids-Rich Wastewater

DOI：10.3969/j.issn.1673-1689.2020.01.012

中文关键词: 厌氧膜生物反应器 高脂肪废水 长链脂肪酸 污泥性质 污染

英文关键词: anaerobic membrane reactor,lipids-rich wastewater,long chain fatty acid,sludge characteristic,fouling

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中文摘要:

高脂肪废水是一类性质较为复杂的废水，在传统厌氧处理中面临污泥漂浮和流失问题。采用厌氧膜生物反应器（AnMBR）对高脂肪废水进行处理，考察了其在厌氧消化过程中的运行特性和污泥性质变化。结果表明，采用AnMBR处理高脂肪废水可获得良好的污染物去除效果和强健的稳定性，COD去除效率可达99%，挥发性脂肪酸（VFA）质量浓度低于200 mg/L，然而在后期运行过程中发现消化效率下降。此外，原水中较高浓度的脂肪导致其水解产物-长链脂肪酸（LCFAs）在体系内发生累积，可能对消化效率及污泥性质产生不利影响。进一步监测其污泥性质发现污泥粒径从26.5 μm下降至6.5 μm，而溶解性胞外聚合物（SMP）质量分数则由47.7 mg/g累积至98 mg/g，污泥的相对疏水性从28.2%上升至68.1%，表明污泥性质发生恶化，从而导致了膜过滤性能下降，膜通量从32 L·（m2·h）-1衰减至10 L·（m2·h）-1。皮尔逊相关性测试表明，膜过滤性能与污泥粒径存在显著正相关关系，而与SMP和污泥相对疏水性呈较强的负相关关系。

英文摘要:

Lipids-rich wastewater is a kind of complex wastewater and easily leads to sludge floating and washingout in the treatment process of conventional anaerobic digestion. In this study，a pilot-scale anaerobic membrane reactor（AnMBR） was adopted to treat the high lipids wastewater，and its operation characteristics and sludge properties were investigated. Results showed that excellent treating efficiency and robust stability were obtained in this systerm，with COD removal efficiency of 99% and VFA concenration below 200 mg/L. However，the digestion efficiency gradually decreased in the late operation stage. Additionally，the hydrolysis products of the high lipids in the influent，the long chain fatty acids（LCFAs），were gradually accumulated in the reactor，which may produce negative effects on the digestion efficiency and sludge properties. Furthermore，the sludge particle size decreased from 26.5 μm to 6.5 μm，while the soluble microbial products（SMP） increased from 47.7 mg/g to 98.0 mg/g and the relative hydrophobicity of sludge elevated from 28.2% to 68.1%. These variations further aggravated the fouling，resulting in an attenuation of flux from 32 L·（m2·h）-1 to 10 L·（m2·h）-1. The pearson correlation test showed that the membrane filtration presented a significant positive correlation with the sludge particle size and a strong negative correlation with the MLSS，SMP and sludge relative hydrophobicity.

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