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 11):17-23.
Characteristics of Organic Matters in Excess Sewage Sludge from Different Sources and Their Anaerobic Digestion Potential
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
11 11
Page:
17-23
Column:
Date of publication:
2021-06-01
- Keywords:
- excess sewage sludge; anaerobic digestion potential; biodegradability; bioaccessibility; three-dimensional fluorescence spectroscopy
- 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.
Last Update:
2021-06-01