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2015 ; 2015
(ä): 205903
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Advanced Treatment of Pesticide-Containing Wastewater Using Fenton Reagent
Enhanced by Microwave Electrodeless Ultraviolet
#MMPMID26347877
Cheng G
; Lin J
; Lu J
; Zhao X
; Cai Z
; Fu J
Biomed Res Int
2015[]; 2015
(ä): 205903
PMID26347877
show ga
The photo-Fenton reaction is a promising method to treat organic contaminants in
water. In this paper, a Fenton reagent enhanced by microwave electrodeless
ultraviolet (MWEUV/Fenton) method was proposed for advanced treatment of
nonbiodegradable organic substance in pesticide-containing biotreated wastewater.
MWEUV lamp was found to be more effective for chemical oxygen demand (COD)
removal than commercial mercury lamps in the Fenton process. The pseudo-first
order kinetic model can well describe COD removal from pesticide-containing
wastewater by MWEUV/Fenton, and the apparent rate constant (k) was
0.0125?min(-1). The optimal conditions for MWEUV/Fenton process were determined
as initial pH of 5, Fe(2+) dosage of 0.8?mmol/L, and H2O2 dosage of 100?mmol/L.
Under the optimal conditions, the reaction exhibited high mineralization degrees
of organics, where COD and dissolved organic carbon (DOC) concentration decreased
from 183.2?mg/L to 36.9?mg/L and 43.5?mg/L to 27.8?mg/L, respectively. Three main
pesticides in the wastewater, as Dimethoate, Triazophos, and Malathion, were
completely removed by the MWEUV/Fenton process within 120?min. The high degree of
pesticides decomposition and mineralization was proved by the detected inorganic
anions.