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Published on: September 26, 2016
Effects of different sludge disintegration methods on sludge moisture distribution and dewatering performance
Lingyun Jin1, Guangming Zhang1, Xiang Zheng1
1School of Environment & Resource, Renmin University of China, Beijing 100872, China.
Sludge disintegration methods were explored to improve sludge dewatering. Potassium ferrate (K2FeO4) and potassium permanganate (KMnO4) oxidation enhanced dewaterability, while ultrasound treatment worsened it.
Area of Science:
- Environmental Science
- Chemical Engineering
- Water Treatment
Background:
- Sludge dewatering is crucial for sludge treatment but challenging for activated sludge.
- Sludge moisture distribution significantly impacts dewatering efficiency.
- Sludge disintegration can alter floc structure and moisture distribution, affecting dewatering.
Purpose of the Study:
- To investigate the effects of ultrasound, K2FeO4 oxidation, and KMnO4 oxidation on sludge disintegration and dewaterability.
- To compare the efficacy of different sludge disintegration methods.
Main Methods:
- Sludge disintegration using ultrasound, K2FeO4 oxidation, and KMnO4 oxidation.
- Measurement of degree of disintegration (DDCOD).
- Analysis of sludge moisture distribution (free, interstitial, bound water) and final water content after centrifugation.
Main Results:
- All three methods showed effectiveness in sludge disintegration.
- K2FeO4 oxidation was more effective than KMnO4 oxidation.
- K2FeO4 and KMnO4 oxidation increased free water content and decreased bound water, improving dewaterability.
- Ultrasound treatment decreased free water, increased bound water, and deteriorated dewaterability.
Conclusions:
- K2FeO4 and KMnO4 oxidation are effective methods for improving sludge dewaterability.
- Ultrasound treatment negatively impacts sludge dewaterability.
- Understanding sludge moisture distribution is key to optimizing dewatering processes.
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