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Liquid and solids separation for target resource recovery from thermal hydrolyzed sludge.
Water Research ( IF 11.4 ) Pub Date : 2020-01-07 , DOI: 10.1016/j.watres.2020.115476
Dan Lu 1 , Dan Wu 2 , Tingting Qian 1 , Jiankai Jiang 3 , Shenbin Cao 3 , Yan Zhou 1
Affiliation  

This study proposed an integrated process for biogas generation and biochar production from thermal hydrolysis pretreated sludge (THP sludge). In this study, the liquid and solids fractions of THP sludge were separately processed for the first time. The liquid fraction of THP sludge (THP-L) reached the biodegradability (262.6 ± 5.1 mL CH4/g tCODfeed) on the 15th day during anaerobic treatment, while the solids fraction of THP sludge (THP-S) only contributed 31.0% to the total methane production and required more than 30 days digestion time. We investigated the feasibility to convert THP-S into biochar to realize the higher value of the solids fraction. The results prove the produced biochar can be used as slow-release fertilizer. Preliminary energy analysis was performed to evaluate the energy efficiency of the integrated approach, namely, methane generation from THP-L coupled with biochar production from THP-S. The process realized energy surplus of 0.81 MWh/tonne dry sludge. In addition, THP-L digested sludge showed better dewaterability, lower yield stress and reduced viscosity during digestion. The proposed new sludge treatment process therefore has lower operating cost and higher value returns.

中文翻译:

液体和固体分离,用于从热水解污泥中回收目标资源。

这项研究提出了一种通过热水解预处理污泥(THP污泥)生产沼气和生产生物炭的集成工艺。在这项研究中,THP污泥的液体和固体部分首次分别处理。在厌氧处理的第15天,THP污泥(THP-L)的液体部分达到了可生物降解性(262.6±5.1 mL CH4 / g tCOD进料),而THP污泥(THP-S)的固体部分仅贡献了31.0%。甲烷总产量,需要30天以上的消化时间。我们研究了将THP-S转化为生物炭以实现更高的固含量的可行性。结果证明所生产的生物炭可用作缓释肥料。进行了初步的能量分析,以评估集成方法的能量效率,即 THP-L产生甲烷,THP-S产生生物炭。该工艺实现了0.81 MWh /吨干污泥的能量过剩。此外,THP-L消化的污泥在脱水过程中表现出更好的脱水性,更低的屈服应力和降低的粘度。因此,拟议的新污泥处理工艺具有较低的运营成本和较高的价值回报。
更新日期:2020-01-07
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