Adsorbable Organic Halogens (AOX) development in UV-oxidative degradation of the wastewater is a phenomenon of pH governing, quantitative measurement of halides, and oxidation model type. Synergy of UV with two oxidants generated the highest amount of AOX. Peroxide induced degradation showed the least development of AOX, depicting more or less the same results with that of ozone induced degradation. AOX concentration, irrespective of the oxidation systems, was found below discharge limit (1.0 mg/ L) when the wastewater fortified with lower concentration of chloride (500 mg/ L) was treated at a wide range of pH values (3~10). However, amount of AOX developed increased from the discharge limit when the systems were operated with higher concentration of chloride (>500 mg/ L). Acidic medium favored AOX development while basic medium suppressed its development. AOX development proceeded with an inclusive trend of corresponding decline in chemical oxygen demand (COD) removal of the wastewater.
MUHAMMAD SALEEM KHAN ,KIM JI HOON ,JUNG SUK HO ,YOUNG JU KIM ,TAHIR IMRAN QURESHI ,
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