Polyhydroxyalkanoates in waste activated sludge enhances anaerobic methane production through improving biochemical methane potential instead of hydrolysis rate.
Polyhydroxyalkanoates in waste activated sludge enhances anaerobic methane production through improving biochemical methane potential instead of hydrolysis rate.
复制标题
废弃活性污泥中的聚羟基脂肪酸酯通过提高生化甲烷潜力而不是水解速率来提高厌氧甲烷产量。
DOI：
10.1038/srep19713
复制
发表时间：
2016-01-21
影响因子：
4.6
通讯作者：
Wang D
中科院分区：
文献类型：
--
作者：
Wang Q;Sun J;Zhang C;Xie GJ;Zhou X;Qian J;Yang G;Zeng G;Liu Y;Wang D
污泥厌氧消化是污泥减量化和稳定化的主要技术。然而，厌氧消化剩余活性污泥（WAS）的产甲烷能力往往受到生化甲烷潜力差和水解速率慢的限制。这项工作使用实验和数学建模方法系统地研究了WAS的PHA水平对厌氧甲烷产生的影响。生化甲烷潜力测试表明，甲烷产量增加PHA水平的WAS。基于模型的分析表明，基于PHA的方法通过提高WAS的生化甲烷潜力来提高甲烷产量，最高提高幅度约为40%（从192升CH 4/千克VS增加到274升CH 4/千克VS; VS：挥发性固体）。相反，水解速率（约0.10 d-1）不受PHA水平的显著影响。经济分析表明，PHA为基础的方法可以节省1.2美元/PE/年（PE：人口当量），在一个典型的污水处理厂（WWTP）。PHA为基础的方法可以很容易地集成到目前的污水处理厂，以提高甲烷的生产，从而提供了一个强有力的支持，在废水管理的持续范式转变，从污染物去除资源回收。
Anaerobic sludge digestion is the main technology for sludge reduction and stabilization prior to sludge disposal. Nevertheless, methane production from anaerobic digestion of waste activated sludge (WAS) is often restricted by the poor biochemical methane potential and slow hydrolysis rate of WAS. This work systematically investigated the effect of PHA levels of WAS on anaerobic methane production, using both experimental and mathematical modeling approaches. Biochemical methane potential tests showed that methane production increased with increased PHA levels in WAS. Model-based analysis suggested that the PHA-based method enhanced methane production by improving biochemical methane potential of WAS, with the highest enhancement being around 40% (from 192 to 274 L CH4/kg VS added; VS: volatile solid) when the PHA levels increased from 21 to 143 mg/g VS. In contrast, the hydrolysis rate (approximately 0.10 d−1) was not significantly affected by the PHA levels. Economic analysis suggested that the PHA-based method could save $1.2/PE/y (PE: population equivalent) in a typical wastewater treatment plant (WWTP). The PHA-based method can be easily integrated into the current WWTP to enhance methane production, thereby providing a strong support to the on-going paradigm shift in wastewater management from pollutant removal to resource recovery.