Wastewater treatment by ozonation has the advantage of
strong oxidizing
ability and no secondary pollution. However, the mass-transfer resistance
of the gas–liquid interface makes this process less efficient.
In this work, a superaerophilic surface was introduced to solve this
problem. It was confirmed that the superaerophilic surface could improve
the liquid phase mass-transfer coefficient (K
L) based on its super affinity to gas through the single board
experiment. Moreover, aeration experiment showed that the result KL of superaerophilic packing resulted in 5.6 and 1.6 times
greater values as compared to the bubbling device and the commercial
aeration device. It was found that superaerophilic packing showed
good performance in both simulated wastewater and actual wastewater.
The decolorization time of simulated dye wastewater was shortened
by 20 and 50% compared with the commercial aeration device and the
bubbling device, respectively. The degradation rate of chemical oxygen
demand was increased by 14% in this system. It was found that the
enhancement was more obvious at a low gas flow rate and a high initial
concentration of the pollutants. The stability test result showed
that the prepared packing had good ozone resistance and solvent stability
and can stand high temperature and hydraulic impact. This work provides
a new strategy for improving gas–liquid mass-transfer efficiency
and has a potential practical prospect.
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