fulltext.study @t Gmail

Ultrasonic-pretreated waste activated sludge hydrolysis and volatile fatty acid accumulation under alkaline conditions: Effect of temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
23687 43463 2012 5 PDF Available
Title
Ultrasonic-pretreated waste activated sludge hydrolysis and volatile fatty acid accumulation under alkaline conditions: Effect of temperature
Abstract

The effect of temperature on the hydrolysis and acidification of ultrasonic-pretreated waste activated sludge (WAS) under alkaline conditions was investigated in this study. The experiment temperatures were set at 10, 20, 37, and 55 °C. Experimental results showed that the hydrolysis of ultrasonic-pretreated WAS under alkaline conditions increased significantly with temperature from 10 to 55 °C, while the volatile fatty acid (VFA) accumulation was not augmented as temperature increased. Among the four temperatures tested, 37 °C was the point with the highest VFA accumulation after 72 h fermentation. VFA accumulation decreased markedly at 55 °C compared to 37 °C. Mechanism investigation revealed that among all the temperatures tested, 37 °C was the temperature at which consumptions of WAS protein and carbohydrate, activities of key enzymes related to VFA formation and ratio of Bacteria to Archaea all reached the maximum. Due to activities of related microorganisms inhibited by higher temperature (55 °C), VFA accumulation decreased at 55 °C.

► Ultrasonic-pretreated WAS hydrolysis increased with temperature from 10 to 55 °C. ► VFA accumulation decreased markedly at 55 °C compared to 37 °C. ► The maximum consumptions of protein and carbohydrate were achieved at 37 °C. ► The highest activities of acid-forming enzymes were obtained at 37 °C. ► The highest ratio of Bacteria to Archaea in fermentation system exhibited at 37 °C.

Keywords
Waste activated sludge (WAS); Temperature; Ultrasonic pretreatment; Alkaline adjustment; Volatile fatty acid (VFA)
First Page Preview
Ultrasonic-pretreated waste activated sludge hydrolysis and volatile fatty acid accumulation under alkaline conditions: Effect of temperature
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 159, Issues 1–2, 31 May 2012, Pages 27–31
Authors
, , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us