Process for purification treatment of wastewater and apparatus for purification treatment of wastewater
A technology of sewage purification and treatment method, applied in non-polluted water treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as clogging, and achieve the effect of increasing bacterial concentration and not easy to scale
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[0098] It should be understood that the embodiments disclosed herein are illustrative only and non-restrictive in all respects. The scope of the present invention is not limited to the construction of this embodiment, but is defined by the following claims. The scope of the present invention is intended to include equivalents of the claims and all modifications within the scope of the claims.
[0099] In the above embodiments, the sewage 8 is introduced directly into the aeration tank 1 . Alternatively, solid matter contained in the sewage 8 may be separated through a commonly used screen, and the sewage 8 after removal of the solid matter may be introduced into the aeration tank 1 . In this case, fouling of the separation membrane 7 caused by the incorporation of the solid matter can be prevented.
[0100] In the above embodiments, the nutrient 11 is automatically added to the aeration tank 1 through the nutrient adding mechanism 6 . Optionally, instead of using the nutrie...
Embodiment 1
[0111] Such as figure 1 As shown, the purification treatment of sewage is carried out by using the sewage purification treatment device for the membrane bioreactor method. A hollow fiber membrane element is used as a separation membrane in a membrane separation tank, wherein the hollow fiber membrane element includes a microfiltration membrane made of polyvinylidene fluoride (PVDF) and having a nominal pore size of 0.1 μm.
[0112] At the start of operation, urea having a nitrogen content of 20% of the COD (1,100 mg / L) of sewage was added as a nutrient to the aeration tank. After the start of operation, continuously add nutrients to the aeration tank, and reduce the amount of nutrients added per unit time according to the COD and nitrogen content of the treated water separated in the membrane separation tank. During the operation, the water temperature in the aeration tank and the membrane separation tank was kept at 30°C.
Embodiment 1 and comparative example 2
[0118] For Example 1 and Comparative Example 2, according to JIS K-0102 (Testing method for industrial wastewater), the BOD of the treated water discharged from the sewage purification treatment apparatus after operation for 24 days or more was measured.
[0119] (measurement of COD)
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Abstract
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