Treatment of Industrial Wastewater by hydroxyl radical
The purpose of wastewater treatment is to remove/reduce organic substances so that the quality of discharged water is improved, and it meets the permissible level of water to be discharged in a water body, be it on land, or an agricultural field. Wastewater is generally categorised by its properties, like total dissolved solids (TDS), turbidity, chemical oxygen demand (COD), biological oxygen demand (BOD), dissolved oxygen, pH, hardness and colour. In this research project, the waste water from the steel industry was treated with H2O2 and photo dissociated by 254 nm UV light in a newly developed flow reactor. The pH and absorption spectrum of the treated wastewater was monitored during the entire treatment process. The absorbance of wastewater was found to be decreasing significantly, indicating efficient removal of organic substances within a short time period.
Keywords: advanced oxidation process, photodissociation, hydroxyl radical, wastewater treatment, absorbance