Pre-treatment of tannery chrome wastewater by green synthesised iron oxide nanocatalyst

ABSTRACT

The pre-treatment of tannery wet-blue wastewater was examined using photo-oxidation of green synthesised iron nanocatalyst. The major variables which can influence of photo-oxidation process for tannery chrome wastewater were screened by response surface methodology coupled with Box–Behnken Design (BBD). Dosage of nanocatalyst, reaction time and pH were selected as effective process variables for photo-oxidation process. The treatment of photo-oxidation of green synthesised iron oxide with chrome wastewater showed Chemical Oxygen Demand (COD) removal of 96.64%, chromium removal 89.43% and colour removal of 97.5%, respectively. The persuade result showed that photo-oxidation of green synthesised iron oxide nanocatalyst was found to be an effective method for tannery chrome wastewater with low cost. The pre-treated chrome wastewater was post-treated by the Reverse Osmosis process (RO) to improve the quality of water and made it suitable for reuse.

KEYWORDS:

• Photo oxidation
• chrome wastewater
• iron oxide
• nano catalyst

Disclosure statement

No potential conflict of interest was reported by the authors.