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Removal of Refractory Pollutants from Landfill Leachate Using Two‐Phase System
Author(s) -
KocJurczyk Justyna
Publication year - 2014
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143013x13807328848810
Subject(s) - leachate , chemistry , benzene , environmental chemistry , ethylbenzene , activated sludge , biological oxidation , reagent , pollutant , biodegradation , nuclear chemistry , organic chemistry , environmental engineering , sewage treatment , wastewater , environmental science
ABSTRACT: The study focused on the problem of removing refractory substances from leachate treated by means of activated sludge method and advanced oxidation process. Biological treatment was conducted in sequencing batch biofilm reactor. Biologically treated leachate was subject to further chemical treatment with the use of Fenton reagent. The permanent dosage of H 2 O 2 amounting to 2 mg·L −1 was applied. Fe(II):H 2 O 2 ratio was 1:10, 1:5 and 1:3. Biological treatment allowed for removing 97% of benzene and only 20% of ethylbenzene. There was a 25% decrease in the concentration of volatile organochlorine compounds. The concentration of benzene in chemically treated leachate increased in comparison with the value found in biologically treated leachate and the growth coincided with the decreasing Fe(II):H 2 O 2 ratio. An analysis of polycyclic aromatic hydrocarbons showed that leachate subjected to advanced oxidation contained the sum of polycyclic aromatic hydrocarbons that was lower than in biologically treated leachate, irrespective of Fe(II):H 2 O 2 ratio.