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Published on: February 15, 2019
Enzyme extraction by ultrasound from sludge flocs
Guanghui Yu1, Pinjing He, Liming Shao
1State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Journal of Environmental Sciences (China)
|May 1, 2009
Summary
Ultrasound extraction effectively isolates more enzyme types from sludge flocs compared to other methods. Optimizing ultrasound intensity is key for efficient enzyme recovery in sludge treatment.
Area of Science:
- Environmental Biotechnology
- Wastewater Treatment
- Enzyme Technology
Background:
- Enzymes are crucial for biological sludge treatment processes.
- Efficient extraction of enzymes from sludge flocs is vital for understanding and optimizing treatment.
- Conventional methods may not fully capture the enzymatic potential within sludge.
Purpose of the Study:
- To present and evaluate an ultrasound-assisted method for enzyme extraction from sludge flocs.
- To compare the efficacy of ultrasound extraction with other methods like ethylenediamine tetraacetic acid (EDTA).
- To determine the optimal parameters for ultrasound-based enzyme extraction.
Main Methods:
- Enzyme extraction from sludge flocs using ultrasound at different frequencies (20 kHz and 40 kHz).
- Comparison with ethylenediamine tetraacetic acid (EDTA) extraction method.
- Optimization of ultrasound parameters including duration and intensity (W/g TSS).
Main Results:
- Ultrasound extraction at 20 kHz yielded a greater diversity of enzymes compared to 40 kHz and EDTA methods.
- Optimal ultrasound parameters identified as 10 min duration and 552 W/g TSS intensity.
- Ultrasound effectively broke cells, extracting extracellular and some intercellular enzymes; intensity was more critical than duration.
Conclusions:
- Ultrasound technology offers a superior method for enzyme extraction from sludge.
- Controlled ultrasound intensity is paramount for maximizing enzyme recovery.
- Enzyme activity correlates with specific cation content, indicating distinct binding characteristics.
