Evaluation of the combined effect of sodium persulfate and thermal hydrolysis on sludge dewatering performance
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RESEARCH ARTICLE
Evaluation of the combined effect of sodium persulfate and thermal hydrolysis on sludge dewatering performance Kai Chen 1,2 & Jingxin Liu 1,2 & Simian Huang 1,2 & Meng Mei 1,2 & Si Chen 1,2 & Teng Wang 1,2 & Jinping Li 1,2 Received: 12 April 2020 / Accepted: 4 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This innovative study makes use of a thermal hydrolysis process (THP) and the conditioner sodium persulfate (SPS) to improve the dewaterability of sewage sludge. The best-operating conditions were optimized using response surface methodology (RSM): 100 mg/g of dry solids (DS) of SPS, 101 min of reaction time of THP, and a temperature of 200 °C. Distribution of extracellular polymeric substances (EPS), zeta potential, bound water, and solid characters were analyzed to reveal the mechanisms involved in the dewatering process. These results indicate that the sewage sludge after treatment (SPS combined with THP) had a superior dewaterability. The specific resistance to filtration (SRF) under the best conditions was 0.51 × 1011 m/kg, decreasing by 91.65% compared to the raw sludge (RS) (6.11 × 1011 m/kg). This mechanism could be explained as follows: (1) Aromaticity and hydrophobicity of sludge cake after SPS + THP treatment was increased; (2) sludge flocs were re-flocculated by charge neutralization, giving rise to a loose and porous structure; (3) the structure of extracellular polymeric substances and cells was destroyed, and the bound water was released. Overall, the conditioning by combination of SPS and THP is an effective mean to improve sewage sludge dewaterability. Keywords Sludge dewaterability . Persulfate oxidation . Thermal hydrolysis process . Specific resistance to filtration . Response surface methodology . Extracellular polymeric substances
Abbreviations 3D-EEM ANOVA AOPs BBD B-EPS D50 DS
Three-dimensional excitation– emission matrix Analysis of variance Advanced oxidation processes Box–Behnken design Bound fraction of extracellular polymeric substances Average median particle size Dry solids
Responsible Editor: Vítor Pais Vilar * Teng Wang [email protected] * Jinping Li [email protected] 1
2
School of Environmental Engineering, Wuhan Textile University, Wuhan 430073, China Engineering Research Centre for Clean Production of Textile Dyeing and Printing, Ministry of Education, Wuhan Textile University, Wuhan 430073, China
DSC EPS PN PS RS RSM SEM S-EPS SPS SPS/S SPS + THP/S SRF T-EPS THP THP/S Wb Wt
Differential scanning calorimeter Extracellular polymeric substances Protein Polysaccharide Raw sludge Response surface methodology Scanning electron microscopy Soluble fraction of extracellular polymeric substances Sodium persulfate Sludge conditioned by sodium persulfate pretreatment Sludge conditioned by sodium persulfate and thermal hydrolysis process Specific resistance to filtration Total extracellular polymeric substances Thermal hydrolysis process Sludge conditioned by thermal hydrolysis process Bound water content Water content
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