| 浓度对高固体污泥热水解特性及流动性的影响 |
| 摘要点击 2325 全文点击 1528 投稿时间：2009-09-22 修订日期：2010-01-04 |
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| 中文关键词 高固体污泥 热水解 固体有机物 厌氧消化 屈服应力 |
| 英文关键词 high solid content sludge thermal hydrolysis solid organics anaerobic biodegradation yield stress |
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| 中文摘要 |
| 考察固体浓度为7％、 9％和13％的高固体污泥的热水解特性,通过生化甲烷潜能（BMP）试验，考察热水解处理高固体污泥厌氧消化性能的变化，通过流变性试验, 考察污泥浓度与流动性的关系. 结果表明, 随着热水解时间延长, 污泥中有机物溶解率增大, 30 min后变化趋于平缓. 水解效率受固体浓度影响, 浓度7%污泥的有机物溶解率高于9%和13%的污泥. 170℃热水解30 min, 7％的污泥SS、VSS和COD的溶解率分别为43％、 47％和42％, VFA/SCOD为20.2％. 热水解污泥厌氧消化性能提高, 相比未经热水解处理的污泥, 浓度7％、 9％和13％的污泥在170℃热水解30 min后产气量分别增加了44％、 27％和9％, 沼气产率分别增加了63％、 74％和37％. 固体浓度对污泥厌氧消化性能的影响显著, 浓度9％的污泥产气中甲烷含量以及沼气产率均高于7％、 13％的污泥. 固体浓度<9％时, 污泥屈服应力增长缓慢, 固体浓度大于9％时, 污泥屈服应力增长快速, 流动性急剧下降. |
| 英文摘要 |
| Thermal hydrolysis characteristics of high solid content (7%, 9% and 13%) sludge were studied by thermal hydrolysis test. Anaerobic biodegradation of treated and untreated sludge and the relation of sludge flowability and sludge solid content were tested by biochemical methane potential (BMP) procedure and rheological test, respectively. Results show that the dissolving ratio of solid organics increase with the prolonging of thermal hydrolysis time, and solid organics dissolve slowly after 30 min. Solid organics dissolving ratio of sludge with 7% solid content is higher than that of 9% and 13% sludge. The dissolving ratio of suspended solid (SS), volatile suspended solid (VSS) and COD of sludge with 7% solid content at 170℃ with 30 min were 43%, 47%, 42% respectively, and VFA/SCOD is 20.2%. Anaerobic biodegradation of treated sludge is improved. Methane production of 7%, 9% and 13% sludge at 170℃ with 30 min were 44％, 27％ and 9％ higher than that of untreated sludge. Methane production ratios increased 63%, 74% and 37% respectively. Methane content and methane production ratio of 9% sludge is higher than that of 7% and 13% sludge. Yield stress increases slowly with the increasing of solid content when solid content is lower than 9%, and it increases much faster and leads a steep decrease of sewage sludge flowability as solid content is higher than 9%. |
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