Geomechanics and Engineering

  • 제13권2호
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  • Pages.319-331
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  • 2017
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Experimental study on vacuum preloading with flocculation for solid-liquid separation in waste slurry

  • Wu, Yajun (Department of Civil Engineering, Shanghai University) ;
  • Kong, Gangqiang (College of Civil and Transportation Engineering, Hohai University) ;
  • Lu, Yitian (Department of Civil Engineering, Shanghai University) ;
  • Sun, De'an (Department of Civil Engineering, Shanghai University)
  • 투고 : 2016.04.22
  • 심사 : 2017.03.11
  • 발행 : 2017.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

This vacuum preloading combined with polyacrylamide (PAM) flocculation was proposed to separating solid-liquid in waste slurry and to improving bearing capacity of soft soil ground. By using waste slurry taken from drilled shaft construction site in Shanghai, China, a series of settling column tests with four typical flocculants and one normal for waste slurry were carried out for comparative analysis. The optimal amounts for each flocculant were obtained from the column tests. Then, model tests on vacuum preloading with anionic polyacrylamide (APAM) flocculation and without flocculants were carried out. The out of water and the settlement of slurry surface ground were monitored during the model tests, and the changes in water content, particle-size and pore-size distributions in different positions after the model tests were measured and discussed. It is found that water content of the waste slurry without APAM flocculation changed from 204 to 195% by 24 hours standing and 15 hours vacuum preloading, while the water content of the waste slurry with APAM flocculation was declined from 163 to 96% by 24 hours standing, and was further reduced into 37% by 136 hours vacuum preloading, which shows that the combined method is feasible and effective.

키워드

과제정보

연구 과제번호 : Anti-clogging mechanism in solid-liquid separation technique using vacuum loading-flocculant method for engineering waste slurry

연구 과제 주관 기관 : Shanghai Natural Science Foundation of China

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피인용 문헌

  1. Colloid effect on clogging mechanism of hydraulic reclamation mud improved by vacuum preloading pp.1208-6010, 2018, https://doi.org/10.1139/cgj-2017-0635
  2. Influence of composite flocculant FeCl3-APAM on vacuum drainage of river-dredged sludge vol.56, pp.6, 2017, https://doi.org/10.1139/cgj-2018-0268
  3. Application of flocculation combined with vacuum preloading to reduce river-dredged sludge vol.38, pp.2, 2017, https://doi.org/10.1080/1064119x.2018.1564092
  4. Dewatering Rate Saltation Problem in PHD-Treated Slurry and a Theoretical Explanation vol.7, pp.4, 2017, https://doi.org/10.1007/s40891-021-00335-1