Removal of Polyphenolic Compounds from Olive Mill Wastewater with Sunlight Irradiation Using Nano-Zno-Sio(2) Composite


Ulusoy C., SPONZA D. T.

7th Global Conference on Global Warming (GCGW), İzmir, Turkey, 24 - 28 June 2018, pp.345-361 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1007/978-3-030-20637-6_19
  • City: İzmir
  • Country: Turkey
  • Page Numbers: pp.345-361
  • Keywords: ZnO-SiO2, Photocatalytic degradation, Olive mill wastewater, Polyphenols, Phenolic compounds, HETEROGENEOUS PHOTOCATALYZED DEGRADATION, OLEA-EUROPAEA L., P-COUMARIC ACID, SENSORY PROPERTIES, OIL, ANTIOXIDANT, RECOVERY, PHENOLS, PROTEIN, DERIVATIVES
  • Dokuz Eylül University Affiliated: Yes

Abstract

Olive mill wastewater (OMW) includes high concentrations of polyphenolic organics. Phenolic compounds in OMW cannot be removed with conventional removal processes. In this study, the polyphenols were removed with nano-ZnO-SiO2 under sunlight. The effects of nano-composite levels, irradiation times, and pH on the phenol removals were investigated. The aim of this study is to photodegrade the total phenol and three polyphenols (gallic acid, para-coumaric acid, t-paracoumaric acid) in the OMW using nano-ZnO-SiO2. The behaviors of elevated nano-ZnO-SiO2 doses (0.5, 1, 3, 5 and 10 g/L), the photodegradation intervals (8, 16, 24 and 36 h) and elevated pHs (4, 7 and 10) during sunlight were researched on the removals of polyphenols in theOMW. The best phenol yield was 73% using 3 g/L nano-ZnO-SiO2 under 24 h sunlight at pH 4. The maximum yields for gallic acid, para-coumaric acid, and t-para-coumaric acid were 90%, 5%, and 5%, respectively.