Laundry wastewater treatment by peroxi-coagulation
Desalination and Water Treatment, cilt.182, ss.98-108, 2020 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 182
- Basım Tarihi: 2020
- Doi Numarası: 10.5004/dwt.2020.25188
- Dergi Adı: Desalination and Water Treatment
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Agricultural & Environmental Science Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Biotechnology Research Abstracts, CAB Abstracts, Environment Index, Geobase, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
- Sayfa Sayıları: ss.98-108
- Anahtar Kelimeler: Peroxi coagulation, Laundry wastewater, Response surface modeling, Surfactant, Persulfate
- Sağlık Bilimleri Üniversitesi Adresli: Evet
Özet
Peroxi-coagulation (PC) process was developed with iron anodes and carbon-polytetrafluoroeth-ylene cathodes for the treatment of laundry wastewater (LWW). The effect of operating conditions as pH, current density and temperature were investigated by response surface modeling. Whereas temperature change did not affect the reaction, pH change dominated it especially between pH 5–7 causing an effective coagulation process. The model was devoted to maximizing the removal of chemical oxygen demand (COD), methylene blue substances (MBAS) and total phosphorus (TP) and to minimizing total residual iron (TFe) concentration in the treated wastewater. Complete TP removal and high removal efficiencies in terms of COD and MBAS were provided at optimal operation conditions (pH 7, current density 45 mA/cm2 and temperature: 25°C). During the PC process H2 O2 and 2– S2 O8 production was observed. According to the results, H2 O2 concentration was stable during the process after a certain increment; however, persulfate production reached maximum value when surfactant (namely: linear alkylbenzene sulfonate) concentration was almost minimum in the bulk. In the PC process, both the oxidation with possibly formed radicals (i.e.• –• OH and SO4 ) and the coagulation with iron precipitation are responsible for the LWW treatment.