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On recycling earth pressure balance shield muck with residual foaming agent: defoaming and antifoaming investigations.
Lu, Yao; Huang, Ming; Zhou, Qi; Wang, Bingnan; Wei, Wei; Chen, Jian.
Afiliación
  • Lu Y; School of Civil Engineering, Fuzhou University, Fuzhou, China.
  • Huang M; School of Civil Engineering, Fuzhou University, Fuzhou, China. huangming05@fzu.edu.cn.
  • Zhou Q; School of Civil Engineering, Fuzhou University, Fuzhou, China.
  • Wang B; School of Civil Engineering, Fuzhou University, Fuzhou, China.
  • Wei W; China Railway 18Th Bureau Group First Engineering Co, Ltd, Baoding, China.
  • Chen J; China Railway 18Th Bureau Group First Engineering Co, Ltd, Baoding, China.
Environ Sci Pollut Res Int ; 31(5): 8046-8060, 2024 Jan.
Article en En | MEDLINE | ID: mdl-38175516
ABSTRACT
Earth pressure balance (EPB) shield is increasingly employed in metro tunnel construction, and causes a series of environmental, safety, and resource waste problems due to the disposal of a considerable amount of muck. In situ recycling of EPB shield muck is an effective solution, whereas the foam is generated by residual foaming agents used as the muck conditioning material during tunnelling, which often adsorbs clay particles and overflows the flocculation tank. To achieve defoaming and antifoaming during the reuse of muck, this study prepared novel eco-friendly silicone oil-polyether defoamers by condensation, compounding, and shear emulsification. Defoaming and antifoaming performances of different defoamers were tested using a modified Ross-Miles method and a scale model of field flocculation systems. The results indicated that a high efficiency in defoam and antifoam was characterized by chemical grafting of nano-SiO2 from silicone oils, uniform distribution and large size of grains, low viscosity, and surface tension. The defoamer dosage of 0.002-0.004 wt% near critical micelle concentration (CMC) for each defoamer is reasonable. Overall, the prepared hydroxyl silicone oil-glycerol polyoxypropylene ether (H-G) defoamer compared with other silicone oil-polyether defoamers and commercial defoamers presents the highest defoaming and antifoaming efficiency. Considering the effects of EPB shield muck, the H-G defoamer is least affected by the compound materials and increasing concentration of the commercial foaming agent. Nevertheless, the stability of the H-G emulsion system is weaker than that of the dimethyl silicone oil-glycerol polyoxypropylene ether (D-G) emulsion system after 1 month of sealed storage.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Polímeros / Glicoles de Propileno / Aceites de Silicona / Antiespumantes Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Polímeros / Glicoles de Propileno / Aceites de Silicona / Antiespumantes Idioma: En Revista: Environ Sci Pollut Res Int Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania