کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4997190 | 1459904 | 2017 | 5 صفحه PDF | دانلود رایگان |
- THPS was applied to inactivate and disrupt sludge for the first time.
- THPS enhanced organics release and improved sludge biodegradability.
- THPS markedly increased VFA production and shortened fermentation time.
- THPS benefited to high molecular weight VFA generation.
A new pretreatment method based on tetrakis hydroxymethyl phosphonium sulfate (THPS) biocide was tried to enhance sludge disintegration, and improved sludge biodegradability and subsequent volatile fatty acid (VFA) production. Sludge activity decreased to less than 10% after 2 days pretreatment using 20Â mg/g-TSS THPS, which also obviously destroyed EPS and cell membrane, and dissolved more biodegradable substances (48.8%) than raw sludge (19.7%). Moreover, 20Â mg/g-TSS THPS pretreatment shortened fermentation time to 4Â days and improved VFA production to 2778Â mg COD/L (4.35 times than that in control). Therein, the sum of n-butyric, n-valeric and iso-valeric acids unexpectedly accounted for 60.5% of total VFA (only 20.1% of that in control). The more high molecular weight VFAs (C4-C5) than low molecular VFAs (C2-C3) resulted from THPS pretreatment benefited to subsequent medium-chain volatile acids (C6-C12) generation to realize the separation and recovery of organic carbon more efficiently.
Journal: Bioresource Technology - Volume 239, September 2017, Pages 518-522