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Abstract
A microwave (MW) assisted oxidation process was investigated for degradation of p-nitrophenol
(PNP) from aqueous solution. The process consisted of a granular activated carbon
(GAC) fixed bed reactor, a MW source, solution and air supply system, and a heat exchanger.
The process was operated in continuous flow mode. Air was applied for oxygen supply.
GAC acted as a MW energy absorption material as well as the catalyst for PNP degradation.
MW power, air flow, GAC dose, and influent flow proved to be major factors which influenced
PNP degradation. The results showed that PNP was degraded effectively by this new
process. Under a given condition (PNP concentration 1330mg/L, MW power 500 W, influent
flow 6.4 mL/min, air flow 100 mL/min), PNP removed 90%, corresponding to 80% of TOC
removal. The pathway of PNP degradation was deduced based on GC-MS identification
of course products. PNP experienced sequential oxidation steps and mineralized ultimately.
Nitro-group of PNP converted to nitrite and nitrate. Biodegradability of the solution
was improved apparently after treatment by MW assisted oxidation process, which benefit
to further treatment of the solution using biochemical method.