| 基于微波-过氧化氢-碱预处理的污泥水解影响因素 |
| 摘要点击 3106 全文点击 1474 投稿时间：2014-11-27 修订日期：2015-01-13 |
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| 中文关键词 微波 过氧化氢 污泥 预处理 水解 |
| 英文关键词 microwave H2O2 sludge pretreatment hydrolysis |
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| 中文摘要 |
| 预处理能有效提高污泥的碳源利用效果. 本研究通过批量试验,考察了经过微波-过氧化氢-碱(MW-H2O2-OH)预处理后的污泥水解的影响因素,包括水解时间、接种比例和温度,并考察了优化条件下的污泥水解效果及其有机物特征. 结果表明,预处理后的污泥优化水解时间为12 h,优化接种比例I/S为0.07. 在此优化条件下(12 h,I/S为0.07),SCOD(溶解性COD)、溶解性蛋白质、溶解性糖类、总挥发性脂肪酸(VFA)的含量均随着温度的升高而增加,在65℃时达到最大. VFA的主要组分均为乙酸、丙酸和异戊酸,其中乙酸所占比例为42.7%~59.7%. 在碳源组成方面,SCOD占污泥TCOD(混合液总COD)的37.8%~40.8%,其中溶解性蛋白质占SCOD的38.3%~41.3%,溶解性糖类占SCOD的9.0%~9.3%,VFA占总SCOD的3.3%~5.5%. 污泥上清液中的COD/TN为15.79~16.50. 三维荧光光谱和有机物表观分子质量分布的分析结果表明,污泥上清液中以溶解性微生物产物类酪氨酸荧光强度最强,并且荧光强度随着水解温度的升高而增强; 经过MW-H2O2-OH预处理后,有机物大量释放,其中包括Mr 100~350的小分子有机物,而经过水解后,Mr 3000~60000的有机物得到降解. |
| 英文摘要 |
| Pretreatment can improve carbon source utilization of sludge. In this study, influencing factors of hydrolysis including hydrolysis time, ratio of seed sludge and temperature were investigated for sewage sludge pretreated by microwave-H2O2-alkaline process through batch experiments. Meanwhile, effects of hydrolysis and releasing characteristics of organic matters were also investigated under the optimized conditions. The results showed that the optimal hydrolysis time was 12 h and the optimized inoculum to substrate ratio (I/S) was 0.07. Under optimized conditions (12 h, I/S=0.07), SCOD, soluble proteins, soluble sugars and total VFAs content increased with increasing temperature, reaching the maximum at 65℃. Acetic, propionic and iso-valeric acids were the dominant VFAs produced, and the percentage of acetic acid accounting for total VFAs was between 42.7% and 59.7%. In terms of carbon source composition, SCOD accounted for 37.8%-40.8% of total COD, soluble proteins accounted for 38.3%-41.3% of SCOD, soluble sugars accounted for 9.0%-9.3% of SCOD and total VFAs accounted for 3.3%-5.5% of SCOD. The COD/TN watio was between 15.79 and 16.50 in the sludge supernatant. The results of the three-dimensional fluorescence spectra and apparent molecular weight distributions showed that the fluorescence intensity of tyrosine-like substances in the soluble microbial products was the highest and increased with the increasing temperature in the sludge supernatant. After the sewage sludge was pretreated by microwave-H2O2-OH process, a lot of organic matters were released, including small molecule organics (Mr 100-350), while after hydrolysis, Mr 3000-60000 organics were degraded. |
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