Toxicity reduction and improved biodegradability of benzalkonium chlorides by ozone/hydrogen peroxide advanced oxidation process
Autor: | Madhumita B. Ray, Mark W. Sumarah, Adnan Khan, Sheila M. Macfie, Jun-Woo Kim |
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Rok vydání: | 2017 |
Předmět: |
Biochemical oxygen demand
0208 environmental biotechnology Chemical oxygen demand Advanced oxidation process Filtration and Separation 02 engineering and technology 010501 environmental sciences Biodegradation 01 natural sciences Chloride 6. Clean water 020801 environmental engineering Analytical Chemistry chemistry.chemical_compound chemistry 13. Climate action medicine Organic chemistry Ammonium Ammonium chloride Hydrogen peroxide 0105 earth and related environmental sciences medicine.drug |
Zdroj: | Separation and Purification Technology. 185:72-82 |
ISSN: | 1383-5866 |
DOI: | 10.1016/j.seppur.2017.05.010 |
Popis: | Advanced oxidation of a mixture of two benzalkonium chlorides (BACs), benzyl dimethyl dodecyl ammonium chloride (BDDA) and benzyl dimethyl tetradecyl ammonium chloride (BDTA), using O3 and H2O2 at elevated pH was performed in Milli-Q water and in a municipal wastewater influent. The potential for O3/H2O2 advanced oxidation process (AOP) to reduce the toxicity of BACs was evaluated. Experimental conditions were optimized using a central composite design (CCD). About 1.28 g h−1 O3 and 200 mg L−1 of H2O2 at pH 11 degraded 90% of the initial BACs (BDDA:BDTA at 50:25 mg L−1) within 30 min. Formation of 25 intermediates and six degradation pathways for the hydrophilic (benzyl and ammonium moiety) and hydrophobic (alkyl chain) constituents of BACs were proposed. Despite the formation of various intermediates, toxicity of BACs in the treated water, assessed using two fresh water algae species (Chlorella vulgaris and Chlamydomonas reinhardtii), was completely removed by O3/H2O2 oxidation. Based on the ratio of the 5-day biological oxygen demand (BOD5) to chemical oxygen demand (COD), AOP improved the biodegradability of BACs. |
Databáze: | OpenAIRE |
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