A method and device for in-situ utilization of sewage to generate electricity to enhance denitrification efficiency of upward vertical flow constructed wetlands
A technology of artificial wetland and vertical flow, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of increasing system operating costs, improve the overall denitrification performance, improve Total nitrogen removal effect, effect of promoting ammonia oxidation process
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Embodiment 1
[0045] An operation method for in-situ utilization of sewage to generate electricity to enhance the denitrification efficiency of an upward vertical flow constructed wetland, the steps of which are as follows:
[0046] A. Sewage enters continuously from the bottom of the system and distributes water evenly, and then rises in push flow along the non-conductive filler layer 1 at the bottom. Under the adsorption, interception and oxidation of fillers and microorganisms in this layer, part of the organic matter is effectively degraded, and at the same time Under the action of nitrifying bacteria, the ammonia nitrogen in the sewage is oxidized to nitrate nitrogen by the oxygen brought into the water, and the heterotrophic denitrifying bacteria use the organic carbon source as an electron donor to reduce a small part of the nitrate nitrogen to nitrogen;
[0047] B. The sewage after step A flows into the anode conductive filler layer 2. Part of the organic matter is used by the anode ...
Embodiment 2
[0058] A device for in-situ generating electricity from sewage to strengthen the denitrification performance of an upward vertical flow constructed wetland, the device is laid with bottom non-conductive filler layer 1, anode conductive filler layer 2; non-conductive filler isolation layer 3; cathode conductive Filling layer 4; It is characterized in that: the anode conductive filler layer 2 is connected to the bottom non-conductive filler layer 1 and the non-conductive filler isolation layer 3 respectively, the cathode conductive filler layer 4 is connected to the non-conductive filler isolation layer 3, and the non-conductive filler isolation layer Planting wetland plants 5 in 3, the anode collector 6 and the cathode collector 7 are short-circuited through the inner wire 8, and the anode collector 6 and the cathode collector 7 are respectively placed in the anode conductive filler layer 2 and the cathode conductive filler layer 4, and the inner wire 8 is buried in the anode co...
Embodiment 3
[0069] For influent water with ammonia nitrogen as the main form, the experiment compared the denitrification effect of the CW-MFC system under short-circuit (0 Ω) and closed-circuit (1000 Ω) conditions, as well as denitrification bacteria and electrogenic bacteria. The results showed that:
[0070] Compared with the external closed-circuit system, the COD removal efficiency of the short-circuit system is more than 10%, the total nitrogen removal efficiency is more than 25%, and the ammonia nitrogen removal rate is more than 60%. The proportion of nitrogen forms in the effluent of the short-circuit system to the total nitrogen is: ammonia nitrogen 34.9%, nitrite nitrogen 17.4%, nitrate nitrogen 39.7%, organic nitrogen 7.9%; the proportion of nitrogen forms in the effluent of the external closed circuit system to the total nitrogen is: ammonia nitrogen 87.1%, organic nitrogen 12.3%, nitrite nitrogen and nitrate nitrogen only accounted for 0.6%.
[0071] The microbial community ...
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