Efficient heterogeneous photo-Fenton and membrane bioreactor coupling process
A membrane bioreactor and reactor technology, applied in the field of water treatment, can solve the problems of membrane fouling, increase operating cost, and reduce biological decomposition efficiency, and achieve the effects of improving treatment efficiency, reducing operating pressure, and improving catalytic effect.
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[0038] Example 1:
[0039] A new coupling process of heterogeneous photo-Fenton and membrane bioreactor was used to treat printing and dyeing wastewater, and the COD of the effluent from photo-Fenton reactor and membrane bioreactor and the change of membrane flux over time were measured. The operating conditions of the photo-Fenton reactor: 5000ml of high-concentration printing and dyeing wastewater, 1.8g of catalyst added, ultraviolet light for 2h, and the catalyst recycled ten times. The operating conditions of the membrane bioreactor: using intermittent pumping mode, pumping 8min, stopping 2min, hydraulic retention time 24h, reactor volume 40L, PVDF microfiltration membrane, transmembrane pressure difference between 0.04MPa and sludge concentration About 5000mg / L. image 3 The photo Fenton catalysts prepared with activated carbon, clay, zeolite, and titanium dioxide as supporting materials were used to remove COD from printing and dyeing wastewater. The results showed that the...
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[0040] Example 2:
[0041] A new coupling process of heterogeneous optical Fenton and membrane bioreactor was used to treat leather wastewater, and the COD of the effluent from the optical Fenton reactor and membrane bioreactor was measured. The operating conditions of the photo-Fenton reactor: 5000ml of high-concentration leather wastewater, 1.8g of catalyst added, UV light for 2h, and the catalyst recycled ten times. The operating conditions of the membrane bioreactor: adopt intermittent pumping mode, suction 8min, stop 2min, hydraulic retention time 24h, reactor volume 40L, PSF ultrafiltration membrane, transmembrane pressure difference between 0.04 and sludge concentration 5000mg / L around. by Figure 7 It can be seen that the COD removal rate of the optical Fenton process is maintained at about 50%, and the coupling system uses ultrafiltration membranes instead of microfiltration membranes, and the COD removal rate is from about 90% to more than 97%.
[0042] Only the membra...
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