Treatment of phenol-containing wastewater, sludge and landfill leachate

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4.
3 Treatment of phenol-containing wastewater

Phenol-containing wastewater has a wide range of sources, such as coking wastewater, coal gasification wastewater, petrochemical wastewater, and polymer material production wastewater
.

Li Xiang et al.
used multi-walled carbon nanotubes (MWNTs) as catalysts to study the activity and stability of catalytic wet oxidation of phenol and aniline in a batch reactor, and used SEM and TEM to characterize the structure of MWNTs
.

Table 3-2 Wet oxidation treatment of phenol-containing wastewater

3.

With the increasing development of modern cities, the discharge of various waste water is increasing rapidly, which makes the sewage treatment of urban sewage treatment plants tend to be centralized and medium-sized.
How to make the large amount of activated sludge produced by sewage treatment be reasonable and effective Treatment has important practical significance for water treatment workers
.

The wet oxidation method has received extensive attention and has made considerable progress in the treatment of high-concentration organic wastewater.
Considering that the material structure of activated sludge is very similar to that of high-concentration organic wastewater, if the technology is successfully applied to urban sewage The treatment of activated sludge in the plant will have a wide range of application prospects
.

At present, many experimental studies on catalytic wet oxidation of municipal sludge have been carried out, such as the preparation of catalyst Cu-Fe-Co-Ni-Ce/Y-Al ₂ O ₃ at a temperature of 180°C, a stirring speed of 600r/min, and an equivalent oxygen content at room temperature.
Under the optimal process conditions of 110 MPa pressure and 810 g/L catalyst addition, the COD removal rate of the sludge after 90 minutes of reaction can reach 72.
6%, and the amount of Cu ²⁺ dissolved is 19.
2 mg/L; after 30 minutes of reaction, 95.
5% of the sludge solid phase The organic matter is digested, the 30min sedimentation ratio is reduced from 94.
4% to 81.
4%, the water content can be reduced to 59.
2% after suction filtration, and the volume reduction is 94.
4%
.

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4.
5 Treatment of landfill leachate

With the development of the world economy and population, the amount of urban waste generated continues to increase
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According to the small-scale experimental process conditions and experimental parameters of the catalytic wet oxidation treatment of landfill leachate, the investment and operating costs of the process can be preliminarily estimated
.