Advanced oxidation process H2 O2 /UV combined with anaerobic digestion to remove chlorinated organics from bleached kraft pulp mill wastewater
DOI:
https://doi.org/10.17533/udea.redin.12485Keywords:
bleaching effluents, recalcitrant organic matter, AOX, biodegradability ratio, advanced oxidation processAbstract
This study investigated the application of an advanced oxidation process combining hydrogen peroxide with ultraviolet radiation (H2 O2 /UV) to remove recalcitrant compounds from Kraft bleaching effluent. Anaerobic pre-treatment was performed to remove easily degraded organics using a horizontal-flow anaerobic immobilized biomass (HAIB) reactor. Bleaching plant effluent was treated in the HAIB reactor processed over 19 h of hydraulic retention time (HRT), reaching the expected removal efficiencies for COD (61 ± 3%), TOC (69 ± 9%), BOD5 (90 ± 5%) and AOX (55 ± 14%). However, the anaerobic treatment did not achieve acceptable removal of UV254 compounds. Furthermore, there was an increase of lignin, measured as total phenols. The H2 O2 /UV post-treatment provided a wide range of removal efficiencies depending on the dosage of hydrogen peroxide and UV irradiation: COD ranged from 0 to 11%, UV254 from16 to 35%, lignin from 0 to 29% and AOX from 23 to 54%. All peroxide dosages applied in this work promoted an increase in the BOD5 /COD ratio of the wastewater. The experiments demonstrate the technical feasibility of using H2 O2 /UV for posttreatment of bleaching effluents submitted to anaerobic pre-treatment.
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