Application of acidic thermal treatment for one- and two-stage anaerobic digestion of sewage sludge.
Application of acidic thermal treatment for one- and two-stage anaerobic digestion of sewage sludge.
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DOI：
10.2166/wst.2010.490
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发表时间：
2010-12
期刊：
影响因子：
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通讯作者：
M. Takashima;Y. Tanaka
中科院分区：
文献类型：
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作者：
M. Takashima;Y. Tanaka
通过106d的连续试验，考察了酸性热处理(ATT)对城市污泥(4.3%TS)一段和两段厌氧消化的效果。ATT在170°C、pH为5的条件下进行1小时(用硫酸降低pH)。一段工艺在水力停留时间(HRT)为20天时为中温，并加入ATT作为前处理。该两段工艺由HRT为5d的高温消化池和HRT为15d的中温消化池组成，并加入ATT作为间歇处理。平均VSS下降率：一期控制组为48.7%，一期组为65.8%，两期组为52.7%，两期组为67.6%。因此，当ATT在一段和两段工艺中结合使用时，VSS的降解率提高了15-17%。此外，消化后污泥的脱水性能得到显著改善，磷释放增加。另一方面，总产甲烷量没有显著差异，而且在ATT消化的污泥溶液中注意到了颜色的产生。综上所述，ATT厌氧消化可以作为污泥减量、处理和磷回收的一种有吸引力的替代方案。
The effectiveness of acidic thermal treatment (ATT) was examined in a 106-day continuous experiment, when applied to one- or two-stage anaerobic digestion of sewage sludge (4.3% TS). The ATT was performed at 170 °C and pH 5 for 1 hour (sulfuric acid for lowering pH). The one-stage process was mesophilic at 20 days hydraulic retention time (HRT), and incorporated the ATT as pre-treatment. The two-stage process consisted of a thermophilic digester at 5 days HRT and a mesophilic digester at 15 days HRT, and incorporated the ATT as interstage-treatment. On average, VSS reduction was 48.7% for the one-stage control, 65.8% for the one-stage ATT, 52.7% for the two-stage control and 67.6% for the two-stage ATT. Therefore, VSS reduction was increased by 15-17%, when the ATT was combined in both one- and two-stage processes. In addition, the dewaterability of digested sludge was remarkably improved, and phosphate release was enhanced. On the other hand, total methane production did not differ significantly, and color generation was noted in the digested sludge solutions with the ATT. In conclusion, the anaerobic digestion with ATT can be an attractive alternative for sludge reduction, handling, and phosphorus recovery.