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Sludge Reduction by H 2 O 2 Oxidation with Fe/MgO Catalyst
Author(s) -
Cho Sung Hoon,
Hwang Duck Kun,
Um Wooyong,
Son Dae Hee,
Oh Kyeongseok
Publication year - 2015
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 - 10.2175/106143015x14338845156704
Subject(s) - catalysis , chemistry , wastewater , chemical oxygen demand , sedimentation , anaerobic digestion , catalytic oxidation , nuclear chemistry , nitrogen , inorganic chemistry , waste management , sediment , methane , organic chemistry , paleontology , engineering , biology
This study aimed to determine whether catalytic pretreatment can be used as a method to reduce the amount of wastewater sludge. In this study, H 2 O 2 oxidation in the presence of a heterogeneous Fe/MgO catalyst was added to the pretreatment step. Initially a laboratory‐scale test showed a TCOD (total chemical oxygen demand) was reduced 27.4% during catalytic oxidation compared to 2.1% in a catalyst‐free option. Catalytic pretreatment was then evaluated in a bench‐scale flow‐loop test. Two bench systems were composed of identical serial processes that included anaerobic digestion, aerobic digestion, and coagulating sedimentation. The only difference between the two processes was whether catalytic pretreatment of sediment sludge was used or not. Results showed that catalyst‐free oxidation TCOD gradually increased from 4200 to 7800 mg/L while catalytic oxidation maintained TCOD values at 4200 ± 200 mg/L. In addition, catalytic pretreatment reduced total nitrogen from 46.9 to 41.0 mg/L and phosphate from 3.1 to 2.3 mg/L.