BACKGROUND: O-phenylene diamine (OPD) is a bioresistant and endocrine disrupting chemical. Fenton oxidation can partially degrade OPD, but the products formed are more bioresistant than OPD. The main objective of the present investigation is to create a novel integrated IINPAC-H 2 O 2 oxidation system followed by anaerobic biological treatment to destroy OPD in aqueous solution.
RESULTS: IINPAC-H2 O 2 oxidation (pre-treatment method) was attempted with the prepared iron impregnated nanoporous activated carbon (IINPAC) catalyst and degradation studies were carried out at optimum conditions, hydraulic reaction time 120 min; pH 7; H 2 O 2 1.76 mmol/L −1 ; IINPAC 0.2 g L −1 and OPD 2000 mg L −1 . The biodegradability index (BOD 5 /COD) of OPD was increased from 0.1 to 0.45 under optimum conditions. The IINPAC-H 2 O 2 treated effluent was further treated in a fluidized anaerobic reactor using Enterococcus faecalis sp. (GenBank: KF656727).
CONCLUSION:The integrated catalytic IINPAC-H 2 O 2 oxidation system and anaerobic biological treatment process removed 98.45% of COD and 79% of BOD 5 . Stability and reusability tests of IINPAC showed that it could retain its catalytic activity even after 15 cycles.
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