Sewage Sludge Electro-Dewatering Treatment-A Review

Research output: Contribution to journalLiterature review

Researchers

  • Pham-Anh Tuan
  • Mika Sillanpää
  • Pirjo Isosaari

Research units

  • Lappeenranta University of Technology
  • Aalto University

Abstract

Purification of municipal wastewater generates huge amounts of sewage sludge, which contains large quantities of water, biomass, and extracellular polymeric substances. It is widely known that sewage sludge usually has a poor dewaterability. A large amount of water in sludge directly translates into high transport and handling costs; therefore, sludge treatment and disposal usually requires over 50% of the operation budget for wastewater treatment plants. The application of a low electric field through the sludge segment, called electro-dewatering, is considered to improve the liquid-solid separation, resulting in low water content in the sludge cake. However, prediction of dewatering enhancement for sewage sludge, in particular, offers a challenge due to variations in sludge pretreatment practices and the lack of harmonized testing methodologies. In this review article, the aspects that have an effect on sewage sludge electro-dewatering and its feasibility are discussed in the light of recent technological developments. It was found that electro-dewatering has several potential benefits, such as removal of pathogens, reduction in energy and transportation costs, and prevention of filter fouling.

Details

Original languageEnglish
Pages (from-to)691-706
Number of pages16
JournalDrying Technology
Volume30
Issue number7
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

    Research areas

  • Biosolids, Electro-dewatering, Electro-osmosis, Sludge dewatering, EXTRACELLULAR POLYMERIC SUBSTANCES, WASTE-WATER TREATMENT, SEQUENCING BATCH REACTORS, SOLIDS RETENTION TIME, LOW F/M BULKING, ACTIVATED-SLUDGE, BOUND WATER, MICROTHRIX-PARVICELLA, FILAMENTOUS BULKING, AEROBIC DIGESTION

ID: 10351619