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Protein extraction from excess sludge by alkali-thermal hydrolysis
Jianlei Gao1, Yingchun Wang1, Yixin Yan2
1School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou, 450001, China.
Environmental Science and Pollution Research International
|January 7, 2020
Summary
This study optimized the alkali-thermal method for extracting protein from excess sludge. The extracted protein demonstrates excellent foaming properties, suitable for industrial applications and improving sludge dewatering.
Area of Science:
- Environmental Science
- Biotechnology
- Chemical Engineering
Background:
- Excess sludge from wastewater treatment poses disposal challenges.
- Sludge contains valuable proteins that can be repurposed.
- Resource utilization of sludge is crucial for sustainable waste management.
Purpose of the Study:
- To optimize the alkali-thermal method for sludge protein extraction.
- To evaluate the protein extraction rate and polypeptide content.
- To assess the foaming performance and industrial applicability of extracted proteins.
Main Methods:
- Optimization of pH, temperature, reaction time, and sludge moisture content.
- Alkali-thermal extraction process.
- Analysis of protein extraction rate and polypeptide concentration.
- Measurement of foamability and foam stability.
- Evaluation of sludge dewatering performance.
Main Results:
- Optimal extraction conditions: pH 12, 120°C, 4h, 92% moisture content.
- Achieved protein extraction rate of 88.3% and polypeptide concentration of 6599 mg/L.
- Foamability reached 450% and foam stability was 88.8%.
- Sludge dewatering improved by 93.1%.
Conclusions:
- The alkali-thermal method effectively extracts sludge protein for industrial use.
- Extracted protein meets standards for foam extinguishing and concrete foaming agents.
- Optimized extraction enhances resource recovery and sludge manageability.
Keywords:
Alkali-heat treatmentFoaming performancePolypeptideProtein solutionResidual sludgeSpecific resistance of sludgeMore Related Videos
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