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Improving sludge dewaterability via Fe2+ chelated citrate activated peroxydisulfate oxidation.
Yuan, Donghai; Li, Xinyu; Xiong, Siyu; Cui, Jun; Zhou, Jijiao; Kou, Yingying.
Afiliación
  • Yuan D; Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
  • Li X; Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
  • Xiong S; Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
  • Cui J; Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
  • Zhou J; Huzhou Environmental Sanitation Management Center, Huzhou 313000, China.
  • Kou Y; Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China. Electronic address: kouyy@bucea.edu.cn.
J Environ Sci (China) ; 125: 223-233, 2023 Mar.
Article en En | MEDLINE | ID: mdl-36375908
Citrate (Ct) was chosen as a typical chelator used in the Fe2+-peroxydisulfate (PDS) process to improve sludge dewaterability. The PDS-Fe2+-Ct process exhibited better performance in sludge dewatering than PDS-Fe2+. Specifically, with a PDS dosage of 1.2 mmol/g VS, the molar ratio of PDS/Fe2+ and Ct/Fe2+ were 4:5 and 1:4, respectively, the capillary suction time decreased from 155.8 to 24.8sec, and the sludge cake water content decreased from 82.62% to 64.11% (-0.06MPa). The oxidation led to a reduced negative charge and a decrease in particle size. The enhanced sludge dewaterability and changes of sludge properties were attributed to the decomposition of extracellular polymeric substances, and it was explored by protein, polysaccharide, 3D-EEMs, and FT-IR. Additionally, the quenching experiments of radical species demonstrated that SO4-• played a more important role than •OH, and its productivity was improved with the addition of Ct. Moreover, the reasons for the improved productivity of radicals with the addition of Ct were discussed. The results of this study could serve as a basis for improving sludge dewatering using the PDS-Fe2+-Ct process and suggest that the addition of Ct may improve the productivity of SO4-• in the activation of PDS via Fe2+.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Ácido Cítrico Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Ácido Cítrico Idioma: En Revista: J Environ Sci (China) Asunto de la revista: SAUDE AMBIENTAL Año: 2023 Tipo del documento: Article País de afiliación: China Pais de publicación: Países Bajos