Electrochemical oxidation of pretreated landfill leachate nanofiltration concentrate in terms of pollutants removal and formation of by-products

Iskurt C., Aliyev E., GENGEÇ E., KOBYA M., Khataee A.

CHEMOSPHERE, cilt.307, 2022 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 307
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.chemosphere.2022.135954
  • 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: Landfill leachate concentrate, AOX, Total active chlorine concentration, Free active chlorine concentration, Chloramines concentration, Halogenated organic compounds, WASTE-WATER TREATMENT, REVERSE-OSMOSIS CONCENTRATE, FENTON OXIDATION, ANODIC-OXIDATION, ELECTRO-FENTON, NITROGEN, AMMONIA, BIODEGRADABILITY, ELECTROOXIDATION, MANAGEMENT
  • Kocaeli Üniversitesi Adresli: Evet

Özet

This study compares the efficiencies of active (Ti/TiO2-RuO2-IrO2 (TIR)) and inactive (Ni/Boron Doped Diamond (BDD)) anodes in terms of pollutant treatment and by-product formation in pretreated (chemical coagulation) landfill leachate nanofiltration membrane concentrate (PLNC). PLNC has high chemical oxygen demand (COD:4900 mg/L), total organic carbon (TOC: 1874 mg/L), total Kjeldahl nitrogen (TKN: 520 mg/L), ammonium nitrogen (NH3-N: 21.35 mg/L), chloride (5700 mg/L) and sulfate (9000 mg/L - due to coagulant type). The parameters of COD, TOC, NH3-N, TKN, free and combined chlorine species, halogenated organic compounds (HOCs), adsorbable organic halogens (AOX), and nitrate at different current density (J: 111-555 A/m(2)) and initial pH (pH(i):3.5-7) were compared for both anodes. The removal efficiencies at the optimum conditions (pH(i) 5.5, 333 A/m(2) and 8 h) were obtained as 86.4% COD, 77.4% TOC, 93.4% TKN, 94.4% NH3-N with BDD and 34.3% COD, 27.3% TOC, 93.7% TKN, 97.4% NH3-N with TIR. According to gas chromatography-mass spectrometry (GC-MS) results obtained under optimum conditions, haloalkane/alkene, halonitroalkane, halonitrile, haloketone, haloalcohols, haloacids, haloaldehydes, haloamines/amides on both electrodes were detected as species of HOCs. In addition, the highest nitrate concentration was observed at the TIR anode, while the highest AOX concentration was observed at the BDD anode.