Effect of operating parameters on the performance of single chemical coagulation (CC), electrooxidation (EO), and a combined CC/EO process for the treatment of car wash wastewater

Akhtar N. A., Kobya M., Gengeç E.

Chemical Engineering Science, cilt.316, 2025 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 316
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.ces.2025.121897
  • Dergi Adı: Chemical Engineering Science
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Aqualine, Biotechnology Research Abstracts, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Pollution Abstracts, zbMATH, DIALNET, Civil Engineering Abstracts
  • Anahtar Kelimeler: Carwash wastewater, Chemical coagulation, Combined treatment processes, Electrooxidation, Operating costs, Treatment efficiency
  • Kocaeli Üniversitesi Adresli: Evet

Özet

In the current research, we investigated the performance of chemical coagulation (CC), electrooxidation (EO), and in combination (CC/EO) processes on the treatment efficiency, total operating costs, and kinetic analysis of car wash wastewater (CWW). In the CC process, COD and BOD removal efficiencies were calculated as 68.4 and 63.5 % for FeCl3 (pH = 8.50) and 64.2 and 58.3 % for alum (pH = 6.50), respectively. In the EO process, under optimum conditions (anode = BDD, j = 40 A/m2, t = 300 min, and SE = 3 g NaCl/L), COD and BOD removal efficiencies were calculated as 80.3 and 74.9 %, respectively. The combined CC/EO process COD and BOD removal efficiency under optimum conditions (for CC process: coagulant = 5 kg FeCl3/m3, pH = 8.50, for EO process: anode = BDD, j = 40 A/m2, t = 120 min, and SE = 3 g NaCl/L) were calculated to be 97.4 and 95.7 %, respectively. Biodegradability (BOD/COD) improved from 0.30 to 0.40 with EO, and to 0.50 with CC/EO. Additionally, a complete analysis was conducted on the specific energy consumption, total operating cost, and first-order kinetic analysis. Overall, results suggest that the CC/EO process is a promising method for efficient CWW treatment.