Enhanced heavy metal leaching from sewage sludge through anaerobic fermentation and air-assisted ultrasonication

Molaey R., YEŞİL H., ÇALLI B., TUĞTAŞ KARNABAT A. E.

Chemosphere, cilt.279, 2021 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 279
  • Basım Tarihi: 2021
  • Doi Numarası: 10.1016/j.chemosphere.2021.130548
  • Dergi Adı: Chemosphere
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, EMBASE, Environment Index, Food Science & Technology Abstracts, Geobase, Greenfile, MEDLINE, Metadex, Pollution Abstracts, Public Affairs Index, Veterinary Science Database, Civil Engineering Abstracts
  • Anahtar Kelimeler: Anaerobic bioleaching, Heavy metal, Post-treatment, Sewage sludge, Volatile fatty acids, WASTE ACTIVATED-SLUDGE, EXTRACELLULAR POLYMERIC SUBSTANCES, SEQUENTIAL EXTRACTION, METHANE PRODUCTION, CO-DIGESTION, WATER SLUDGE, PRETREATMENT, REMOVAL, ACID, DISINTEGRATION
  • Marmara Üniversitesi Adresli: Evet

Özet

© 2021 Elsevier LtdInterest in using stabilized sewage sludge in agriculture is mainly to benefit from its nutrient content, soil conditioning properties, and water holding capacity. Therefore, sludge management practice needs to be directed from treatment liability towards the recovery of chemical assets embedded in sludge. In this study, anaerobic fermentation process integrated with a new treatment method; i.e., air-assisted ultrasonication, was used to assess the leaching of heavy metals (HM) from waste activated sludge (WAS). Fermentation processes resulted in 9390 mg COD/L of volatile fatty acids (VFAs) production, 26% Ni solubilization and up to 3.4% solubilization of other target metals (Cu and Zn). Application of the air-assisted ultrasonication as a post-treatment to fermentation process stimulated the migration and transformation of HMs to the liquid fraction of the digestate. Applying specific energy input greater than 9 kJ/g total solids (TS) through ultrasonication and supplying air with constant flow rate of 0.875 L of air/(L of digestate.min) resulted in leaching of more than 83% of Ni, 82% of Cu and 80% of Zn.