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Related Experiment Videos

[Electro-flotation using in solid-liquid separation of activated sludge].

Jin-Luan Chen1, Jing Wan, Han-Chang Shi

  • 1ESPC State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.

Huan Jing Ke Xue= Huanjing Kexue
|March 1, 2007
PubMed
Summary
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Electro-flotation effectively separates suspended solids (SS) from activated sludge, with hydraulic retention time and current density being key factors for high removal efficiency. This method also yields sludge with lower water content, simplifying disposal.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Electrochemistry

Context:

  • Activated sludge treatment generates suspended solids (SS) requiring efficient separation.
  • Conventional methods like dissolved air flotation and secondary sedimentation have limitations in sludge dewatering.
  • Electro-flotation offers a promising alternative for solid-liquid separation in wastewater treatment.

Purpose:

  • To investigate the performance of an electro-flotation cell for suspended solids removal from activated sludge.
  • To determine the impact of operating parameters such as hydraulic retention time (HRT), current density, initial SS concentration, and pH on separation efficiency.
  • To evaluate the energy consumption and sludge characteristics of the electro-flotation process.

Summary:

Related Experiment Videos

  • An electro-flotation cell with Ti/RuO2-IrO2-TiO2 anodes and Ti screen cathodes was used to separate SS from activated sludge.
  • Optimal performance was achieved with HRT of 20 min and specific current densities, reaching a 97% SS removal ratio.
  • HRT and current density were identified as the primary factors influencing SS removal, while pH had minimal impact.

    • Impact:

    • Electro-flotation demonstrates high performance in solid-liquid separation, achieving significant SS removal (up to 97%).
    • The process is energy-efficient, with consumption around 0.4-0.5 kW·h/m³.
    • The resulting sludge has considerably lower water content compared to conventional methods, facilitating sludge management and disposal.