A composition for treating polychlorinated biphenyls in soil eluent and its application
A polychlorinated biphenyl and eluent technology, applied in the field of soil pollution remediation, achieves the effects of high utilization rate, good persistence and fast production rate
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Embodiment 1
[0033] The experiments compared the removal rates of PCBs in Brij35 by vanadium oxide-activated sodium persulfate, vanadium oxide alone and sodium persulfate alone, and Fenton's reagent was used as a control.
[0034] Using V 2 o 3 、VO 2 and V 2 o 5 In the heterogeneous reaction of activated sodium persulfate (PS), a serum bottle with a polytetrafluoroethylene stopper was used as the reactor, the eluent was 250 mL, the initial concentration of vanadium oxide was 0.1 g / L, and the concentration of PCBs 10mg / L, the content of Brij35 is 0.1g / L, the concentration of sodium persulfate is 2.38g / L (10mM), pH 6.5 (borate buffer solution), the reaction bottle is placed in a shaking bed, and the rotating speed is 150rpm , the temperature is 25°C. Fenton's reagent H 2 o 2 Concentrations were 10mM and 20mM, Fe 2+ Concentrations of 2mM and 4mM were named as H 2 o 2 -T1 and H 2 o 2 -T2.
[0035] In the experiment of adding vanadium oxide alone, there is no need to add sodium per...
Embodiment 2
[0042] The experiment compared the removal rate of high-concentration PCBs with different vanadium oxide dosages.
[0043] Using V 2 o 3 、VO 2 and V 2 o 5 In the heterogeneous reaction of activated sodium persulfate (PS), a serum bottle with a polytetrafluoroethylene stopper was used as the reactor, the eluent was 250 mL, and the initial concentration of vanadium oxide was 0.05, 0.1, 0.2, 0.5 and 1.0g / L, the concentration of PCBs is 50mg / L, the content of Brij35 is 0.5g / L, the concentration of sodium persulfate is 23.8g / L (100mM), pH 6.5 (buffer solution), put the reaction bottle on the shaking bed , the rotation speed is 150rpm, and the temperature is 25°C.
[0044] In the experiment of adding 1.0g / L vanadium oxide alone, there is no need to add sodium persulfate, and other conditions are the same as above.
[0045] In the experiment of adding 23.8g / L sodium persulfate alone, there is no need to add vanadium oxide, and other conditions are the same as above.
[0046] T...
Embodiment 3
[0051] The experiment compared the applicability of vanadium oxide activated sodium persulfate to degrade PCBs in the eluent under different pH and temperature conditions. Using V 2 o 3 、VO 2 and V 2 o 5 In the heterogeneous reaction of activated sodium persulfate (PS), a serum bottle with a polytetrafluoroethylene stopper was used as the reactor, the eluent was 250 mL, the initial concentration of vanadium oxide was 0.1 g / L, and the concentration of PCBs 10mg / L, the content of Brij35 is 0.1g / L, the concentration of sodium persulfate is 2.38g / L (10mM), pH 7.5 and 8.5 (buffer), the reaction bottle is placed in the shaking bed, the rotating speed is 150rpm, The temperatures were 25°C and 40°C, respectively.
[0052] Table 3 Effect of activation system on removal rate of PCBs at different pH and temperature
[0053]
[0054] As can be seen from Table 3, this type of activator has a good effect in a wide pH range, such as V 2 o 3 / PS can remove 78.1% of PCBs at pH 8.5, ...
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