Removal of dissolved organic carbon from oily produced water by adsorption onto date seeds

Equilibrium, kinetic, and thermodynamic studies

Mansour Al Haddabi, Hari Vuthaluru, Hussein Znad, Mushtaque Ahmed

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The feasibility of date seeds as a new low-cost natural adsorbent for the removal of dissolved organic carbon (DOC) from oily produced water was investigated. The aim of this study was to elucidate the mechanism associated with the removal of DOC and to find the best equilibrium isotherms and kinetic models for DOC removal in batch adsorption experiments. The effect of various physicochemical parameters such as initial DOC concentration (18.5-93.5 mg/L), solution pH (4-9), temperature (25-45 °C), and date seeds dosages (0.5-2.0 g) was evaluated. The equilibrium stage was attained after a contact time of 120 min. The maximum DOC removal was 82 % for 93.5 mg/L of DOC concentration. The equilibrium data were well represented by the Langmuir isotherm. The maximum monolayer adsorption capacity of date seeds was found to be 74.62 mg/g. The separation factor, R L, from the Langmuir equation and the Freundlich constant, n, indicated a favorable adsorption. The kinetic studies indicated that the adsorption process follows the pseudo-second-order kinetics. The adsorption of DOC is governed by both surface and pore diffusion. The results revealed that the DOC uptake decreases when temperature and pH increases. The adsorption process has been found exothermic in nature, and the thermodynamic parameters were determined. The Langmuir isotherm model equation was adopted to design a single-stage batch absorber for DOC adsorption onto date seeds. The study demonstrated that date seeds can be considered as a promising low-cost adsorbent for the removal of DOC from oily produced water.

Original languageEnglish
Article number172
JournalWater, Air, and Soil Pollution
Volume226
Issue number6
DOIs
Publication statusPublished - Jan 1 2015

Fingerprint

Organic carbon
dissolved organic carbon
Seed
thermodynamics
Thermodynamics
adsorption
seed
Adsorption
kinetics
Kinetics
water
Isotherms
isotherm
Adsorbents
Produced Water
removal
R Factors
cost
Costs
Monolayers

Keywords

  • Date seeds
  • DOC
  • Equilibrium isotherms
  • Kinetic models
  • Thermodynamics

ASJC Scopus subject areas

  • Pollution
  • Environmental Chemistry
  • Environmental Engineering
  • Ecological Modelling
  • Water Science and Technology

Cite this

Removal of dissolved organic carbon from oily produced water by adsorption onto date seeds : Equilibrium, kinetic, and thermodynamic studies. / Al Haddabi, Mansour; Vuthaluru, Hari; Znad, Hussein; Ahmed, Mushtaque.

In: Water, Air, and Soil Pollution, Vol. 226, No. 6, 172, 01.01.2015.

Research output: Contribution to journalArticle

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