Anatomy of the organic carbon in an industrial wastewater: Implications of particle size distribution, respirometry and process modelling


Doğruel S. , Altun A., Çokgör E. , Insel G. , KESKİNLER B., Orhon D.

PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, vol.146, pp.257-266, 2021 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 146
  • Publication Date: 2021
  • Doi Number: 10.1016/j.psep.2020.09.002
  • Title of Journal : PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
  • Page Numbers: pp.257-266

Abstract

This study evaluated the fate of chemical oxygen demand (COD) fractions of an organized industrial district effluent treated with pilot membrane bioreactor (MBR) system. A series of respirometric analyses were performed on raw wastewater together with 450 nm, 100 kDa and 1 kDa filtered samples obtained from particle size distribution (PSD) experiments. The PSD analysis revealed that more than 300 mg/L of the influent COD accumulated in the lowest size range (<2 nm), accounting for 49-52 % of the total COD. The bulk (64 %) of the influent COD consisted of soluble hydrolysable COD (S-H1). The hydrolysis rates for S-H1 (0.80-1.28 1/day) were slightly below the levels suggested for domestic wastewaters, indicating the presence of inhibitory compounds in industrial wastewaters. The COD removal efficiency of MBR pilot was found as 85 %; however, 43 % of effluent COD (106 mg/L) still included rapidly hydrolysable organics in the size bracket of 5-30 nm. In this respect, the COD fractions for activated sludge process models used for MBR applications require a new-insight to correctly reflect organic matter balances in the treatment system. (C) 2020 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.