Effect of dewatering conditioners on phosphorus removal efficiency of sludge biochar

Based on the best dehydration effect, this study compared the adsorption phosphorus effect of sludge biochar after sludge conditioning with FeCl 3 , KMnO 4 , and cationic polyacrylamide (CPAM). This provided insights into the effects of chemical conditioning during the sludge dewatering stage on the...

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Bibliographic Details
Published in:Environmental technology 2023-09, Vol.44 (20), p.3131-3139
Main Authors: Deng, Peiyao, Liu, Chang, Wang, Maoqing, Lan, Guoxin, Zhong, Yinhai, Wu, Yan, Fu, Chuan, Shi, Hongyi, Zhu, Rui, Zhou, Linlin
Format: Article
Language:English
Subjects:
Adsorption
adsorption effect
Anions
Charcoal
Charcoal - chemistry
Conditioning
Dehydration
Dewatering
dewatering conditioner
Ferric chloride
Fourier transforms
Functional groups
Infrared analysis
Infrared spectroscopy
phosphate
Phosphates
Phosphates - chemistry
Phosphorus
Phosphorus removal
Polyacrylamide
Potassium permanganate
Pyrolysis
Scanning electron microscopy
Sewage - chemistry
Sludge
Sludge biochar
Sludge conditioning
Sludge drying
sludge treatment
Spectrum analysis
Waste Disposal, Fluid - methods
Water Pollutants, Chemical - chemistry
X-ray spectroscopy
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Summary:Based on the best dehydration effect, this study compared the adsorption phosphorus effect of sludge biochar after sludge conditioning with FeCl 3 , KMnO 4 , and cationic polyacrylamide (CPAM). This provided insights into the effects of chemical conditioning during the sludge dewatering stage on the overall phosphate adsorption of the dewatered sludge biochar. The phosphorus adsorption mechanism of the dewatering sludge biochar was analysed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier-transform infrared spectroscopy. Under the optimal pyrolysis temperature (300°C), the phosphate adsorption capacity of FeCl 3 -conditioned sludge biochar (SB-FeCl 3 ) was increased 77 times of the unconditioned sludge biochar. In different solution environments (e.g. pH and coexisting anions), Phosphate adsorption of SB-FeCl 3 was srtrongest when the pH of 9 and contained CO 3 2- . Through the analysis of surface elements and functional groups, it was explained that the phosphorus removal effect of SB-FeCl 3 comes from abundant active sites containing iron. Phosphorus release occurred in sludge biochar (SB) during the study. SB-FeCl 3 solved SB the release of phosphorus, and improved the adsorption capacity of phosphorus.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2022.2052360