SUN Yang-yang,ZHANG Yu-chen,XU Su-yun.Characteristics of Organic Matters in Excess Sewage Sludge from Different Sources and Their Anaerobic Digestion Potential[J].China Water & Wastewater,2021,37(11):17-23.
不同来源剩余污泥有机质赋存特征及厌氧消化潜能
- Title:
- Characteristics of Organic Matters in Excess Sewage Sludge from Different Sources and Their Anaerobic Digestion Potential
- Keywords:
- excess sewage sludge; anaerobic digestion potential; biodegradability; bioaccessibility; three-dimensional fluorescence spectroscopy
- 摘要:
- 采用改进的化学分级提取方案结合三维荧光光谱法，研究了4个污水处理厂污泥样品的生物可及性与生物可降解性，并通过生化产甲烷潜力（BMP）测试进行验证。结果表明，污泥经过41 d的厌氧消化，挥发性固体（VS）去除率依次为曲阳(B，59.1%）＞石洞口(D，51.1%）＞松申(C，45.8%）＞东区(A，30.0%），累积甲烷产量为B（272.4 mL/gVS）＞C（234.4 mL/gVS）＞D（170.3 mL/gVS）＞A（111.9 mL/gVS），因此VS去除率并不能直接反映甲烷产量高低，其中腐殖质类物质的溶出对甲烷产量的贡献可能为负。分级提取将污泥中的有机质分为5个组分：溶解性有机物（DOM）、可溶颗粒有机物（SPOM）、易提取有机物（REOM）、缓慢提取有机物（SEOM）和难提取有机物（PEOM），生物可及性依次降低。将污泥厌氧降解性相关测试参数（BMP、VS去除率）与各组分荧光指数进行二元Pearson相关性分析，结果表明，污泥的FREOM（REOM层可降解荧光指数）和FSEOM（SEOM层可降解荧光指数）与BMP之间的相关性较强。因此，基于分级提取获得的荧光指数有望用于复杂有机物的生物降解性能评价、预测污水处理厂污泥的厌氧消化潜力。
- Abstract:
- Bioaccessibility and biodegradability of sludge samples from four wastewater treatment plants were explored by using the modified sequential chemical extraction scheme combined with threedimensional fluorescence spectrometry, and the results were verified by biomethane production potential (BMP) tests. After 41 d anaerobic digestion, the removal rates of volatile solids (VS) in descending order were Quyang (B, 59.1%), Shidongkou (D, 51.1%), Songshen (C, 45.8%) and Dongqu (A, 30.0%), and the cumulative methane production rates in descending order were B (272.4 mL/gVS), C (234.4 mL/gVS), D (170.3 mL/gVS) and A (111.9 mL/gVS). Therefore, the removal rate of VS could not directly reflect the methane production potential, and the contribution of humus dissolution to methane production may be negative. The organic matters in sludge samples were sequentially divided into five components: dissolved organic matter (DOM), soluble particulate organic matter (SPOM), readily extractible organic matter (REOM), slowly extractible organic matter (SEOM) and poorly extractible organic matter (PEOM), and the bioaccessibility was decreased one by one. The test parameters (BMP and VS removal rate) and the fluorescence index of each component were analyzed by binary Pearson correlation. Results showed that FREOM (REOM fraction biodegradable index) and FSEOM (SEOM fraction biodegradable index) of sludge had stronger correlations with BMP. Therefore, the fluorescence index based on fractional extraction is expected to be applied to evaluate the biodegradation performance of complex organic compounds and predict the anaerobic digestion potential of excess sewage sludge.
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