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Processing dewatered sewage sludge using electrokinetic technology.

J Y Wang1, D S Zhang, O Stabnikova

  • 1School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore. jywang@ntu.edu.sg

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|December 8, 2004
PubMed
Summary

Electrokinetic (EK) technology effectively removes heavy metals and pathogens from sewage sludge, making it safer for land application. This innovative treatment enhances sludge stability while managing nutrient content.

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Area of Science:

  • Environmental Engineering
  • Waste Management
  • Applied Electrochemistry

Background:

  • Land application of sewage sludge is hindered by heavy metal contamination and pathogens.
  • Developing safe and effective sludge treatment methods is crucial for sustainable resource recovery.

Purpose of the Study:

  • To evaluate the efficacy of electrokinetic (EK) technology for treating dewatered sewage sludge.
  • To assess the impact of EK treatment on heavy metal removal, pathogen reduction, and sludge chemical properties.

Main Methods:

  • Application of innovative electrokinetic (EK) technology to dewatered sewage sludge.
  • Acidification pretreatment to enhance pathogen reduction.
  • Analysis of heavy metal concentrations (Zn, Cu, Ni, Cr, As, Pb) and pathogen indicators (heterotrophic bacteria, total coliforms, fecal coliforms).

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  • Evaluation of sludge chemical characteristics, including nutrient content (K, N, P) and stability via carbon dioxide evolution rate.

    • Main Results:

    • High removal efficiencies for Zn (94.9%), Cu (95.4%), Ni (89.7%), and Cr (67.8%).
    • Significant reduction in heterotrophic bacteria (from 1.5 x 10(8) to 1.1 x 10(4) c.f.u./g) and elimination of coliforms.
    • Minor losses of K and N, but significant loss of P observed.
    • Treated sludge exhibited high stability, indicated by low carbon dioxide evolution rate.

    Conclusions:

    • Electrokinetic (EK) technology is a promising method for detoxifying sewage sludge, reducing heavy metals and pathogens.
    • EK treatment improves sludge stability, facilitating its potential use as a fertilizer.
    • Careful management of nutrient losses, particularly phosphorus, is necessary during EK treatment.