Phosphorus complexation of sewage sludge during thermal hydrolysis with different reaction temperature and reaction time by P K-edge XANES and 31P NMR

Han, Xiaomin; Wang, Fei; Zhou, Beihai; Chen, Huilun; Yuan, Rongfang; Liu, Shuhu; Zhou, Xiaoqin; Gao, Ling; Lu, Yan; Zhang, Ru

doi:10.1016/j.scitotenv.2019.06.017

“…Park et al (2018) found that the properties of the hydrochar and biomass dewaterability could improve with a hydrothermal treatment time of 1 h. We found that the significant influencing factors on the CST reduction efficiency in the experiment were the hydrothermal temperature and SPS concentration. Han et al (2019) found that the temperature of the thermal hydrolysis pretreatment had a larger effect on the P complexation of sewage sludge than the reaction time. The optimal experimental conditions obtained from the RSM model of the hydrothermal temperature, time, and SPS concentration were found to be 145 °C, 2 h, and 150 mg/g, respectively.…”

Section: Rsm Optimization Resultsmentioning

confidence: 97%

Influence of Persulfate on Transformation of Phosphorus and Heavy Metals for Improving Sewage Sludge Dewaterability by Hydrothermal Treatment

Xiong

¹

,

Xia

²

,

Xiang

³

et al. 2021

Preprint

0

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Activated persulfate oxidation has been proven to be an efficient advanced sludge treatment technique to improve sludge dewaterability. This study investigates the influence of persulfate on the transformation of phosphorus (P) and heavy metals (HMs) during the hydrothermal treatment of sewage sludge. The hydrothermal temperature, time, and persulfate concentration are optimized by a Box-Behnken design to obtain the best sludge dewaterability, which is expressed by capillary suction time (CST). The highest CST reduction efficiency is 90.5% at the optimal hydrothermal temperature, time and concentration of persulfate, which are 145 °C, 2 h, and 150 mg/g DS, respectively. The distribution and transformation of P and HMs with different persulfate concentrations (100-200 mg/g DS) during the hydrothermal process are investigated. Results show that more than 90% of the P and HMs in the sludge are retained in sludge cakes after the hydrothermal treatment. The addition of SPS can make the P in the sludge cakes transform into more stable P species according to the extraction capacity of sequential extracts. It can be found from the ecological risk indexes of the HMs that the addition of SPS during the hydrothermal treatment of sludge can reduce the environmental risk of HMs. This study provides insights into the P and HM distribution and transformation during hydrothermal treatment with persulfate, providing a reference for sludge recovery strategies.

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“…The results of their study suggested that hydrothermal carbonization could efficiently immobilize P in cow manure. The unit mass of P in sludge cakes clearly increased after the hydrothermal treatment owing to the volatilization of organic matter (Han et al, 2019). In addition, the hydrothermal treatment process may suppress the P release into liquid; therefore, P was retained on the hydrochar of sewage sludge.…”

Section: Effects Of the Sps Concentration On The Distribution Of P Be...mentioning

confidence: 99%

Influence of persulfate on transformation of phosphorus and heavy metals for improving sewage sludge dewaterability by hydrothermal treatment

Xiong

¹

,

Xia

²

,

Wu

³

et al. 2022

Environ Sci Pollut Res

3

0

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Activated persulfate oxidation has been proven to be an efficient advanced sludge treatment technique to improve sludge dewaterability. This study investigates the influence of persulfate on the transformation of phosphorus (P) and heavy metals (HMs) during the hydrothermal treatment of sewage sludge. The hydrothermal temperature, time, and persulfate concentration are optimized by a Box-Behnken design to obtain the best sludge dewaterability, which is expressed by capillary suction time (CST). The highest CST reduction efficiency is 90.5% at the optimal hydrothermal temperature, time and concentration of persulfate, which are 145 °C, 2 h, and 150 mg/g DS, respectively. The distribution and transformation of P and HMs with different persulfate concentrations (100-200 mg/g DS) during the hydrothermal process are investigated. Results show that more than 90% of the P and HMs in the sludge are retained in sludge cakes after the hydrothermal treatment. The addition of SPS can make the P in the sludge cakes transform into more stable P species according to the extraction capacity of sequential extracts. It can be found from the ecological risk indexes of the HMs that the addition of SPS during the hydrothermal treatment of sludge can reduce the environmental risk of HMs. This study provides insights into the P and HM distribution and transformation during hydrothermal treatment with persulfate, providing a reference for sludge recovery strategies.

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“…The phosphorus recovery increased with the increase of temperature, and a maximum phosphorus recovery of 98.74% was achieved at 420°C. Han et al (2019) researched the effects of a hydrolysis temperature ranged from 140 to 200°C on the phosphorus release from sewage sludge. The THP temperature significantly influenced the phosphorus extraction than the reaction time, and the bioavailability of phosphorus in hydrochars declined with the increase of hydrolysis temperature.…”

Section: Thermal Effects On Removal and Recovery Of Phosphorusmentioning

confidence: 99%