AI Article Synopsis
- This study looked at how different types of char from sewage sludge help produce methane gas during digestion of waste.
- Hydrochar worked better than pyrochar, with the best results coming from the HC180 type, producing lots of methane.
- The study found that hydrochar not only helped break down sludge better but also helped certain bacteria grow faster, making more methane gas.
Article Abstract
This study compared the effects of sewage sludge-derived pyrochar (PC300, PC500, and PC700) and hydrochar (HC180, HC240, and HC300) on mesophilic anaerobic digestion of waste activated sludge (WAS). It was demonstrated that hydrochar can better promote the methane production compared with pyrochar. The highest accumulative methane yield of 132.04 ± 4.41 mL/g VS was obtained with HC180 addition. In contrast, the PC500 and PC700 showed a slightly negative effect on methane production. Sludge-derived HC not only accelerated the solubilization and hydrolysis of sludge floc, but also improved the production of acetic acid and propionate, further resulting in improved methane production. Simultaneously, the syntrophic microbes facilitating direct interspecies electron transfer (DIET) such as Syntrophomonas, Peptococcaceae, Methanosaeta and Methanobacterium bred rapidly with the addition of HCs. These results indicated that the hydrochar is more ideal as the accelerant to promote the methane production from mesophilic anaerobic digestion of WAS than the pyrochar.
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| http://dx.doi.org/10.1016/j.biortech.2019.122235 | DOI Listing |
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