Synergetic treatment of sewage sludge and food waste for biogas generation and heavy metals immobilization via anaerobic digestion and pyrolysis

Chunxing Li, S. Xie, Xinyu Zhu, R. Tian, Irini Angelidaki, Y. Wang

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Abstract

In this study, a novel method was proposed for synergetic treatment of sewage sludge and food waste. First, the sewage sludge was hydrothermally treated to improve its dewaterability. The separated filtrate from hydrothermally treated sewage sludge (HS) and food waste co-digested for biogas generation. The obtained digestate residue (DR) was used for co-pyrolysis with sludge filter cake from HS for heavy metals immobilization. The obtained results showed that the methane yield of filtrate was significantly increased with addition of food waste and the lag phase during the digestion of food waste was shortened during co-digestion. In terms of heavy metals immobilization, the heavy metals in sewage sludge were immobilized during co-pyrolysis process. Moreover, the higher DR content led to better immobilization effect. These above results provided the feasibility for more efficient and safer synergetic treatment of sewage sludge and food waste.
Original languageEnglish
Publication date2019
Number of pages3
Publication statusPublished - 2019
Event16th IWA World Conference on Anaerobic Digestion - Delft, Netherlands
Duration: 23 Jun 201927 Jun 2019
Conference number: 16

Conference

Conference16th IWA World Conference on Anaerobic Digestion
Number16
CountryNetherlands
CityDelft
Period23/06/201927/06/2019

Keywords

  • Sewage sludge
  • Food waste
  • Anaerobic digestion
  • Pyrolysis
  • Biogas
  • Heavy metal immobilization

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