1、外文资料 DE-oxidation ditch biological nitrogen and phosphorus removal process 1、 DE-oxidation ditch biological nitrogen removal process Nitrogen is a plant growth essential nutrients, but if the chlorine content in water too high, it will produce eutrophication so that the dissolved oxygen content to r
2、educe, the proliferation of algae growth, accelerate the aging process of natural water bodies. In addition to the nitrate form of chlorine is considered a cause of infant leukemia temporary high-speed railway on January 1 of the root causes of hemoglobin. Therefore, drinking water sources will Liur
3、en the oxidation ditch water is necessary dechlorination. Oxidation Ditch biological nitrogen removal is the first by the self-support of aerobic microbes in the aerobic state, the use of dissolved oxygen in the mixture through nitrification will be for the effect of nitrate oxide, and then from het
4、erotrophic microorganisms in the state in the anti-anoxia The role of nitrifying bacteria, the use of nitrates in the role nitrification oxygen to produce anti-nitrate nitrogen into the release of chlorine out. Nitrification-as： Nitrifying bacteria NH 4 + 1.86+O 2 1.985+HCO 3 0.021C 5 H 7 O 2 N+1.04
5、4H 2 O+ 1,881H 2 CO 3 +0.98NO 3 - Denitrification-as： Denitrifying bacteria NO 3 - +1.08CH 3 OH+0.24H 2 CO 3 0.056C 5 H 7 O 2 N+0.47N 2 + 1.68 H 2 O+HCO 3 - Denitrifying bacteria NO 3 - +0.67CH 3 OH+0.53H 2 CO 3 0.04C 5 H 7 O 2 N+0.48N 2 + 1.23 H 2 O+HCO 3 - DE-oxidation ditch the dechlorination rol
6、e through a special operation mode, in turn create two Gounei nitrification and nitrification conditions. Nitrogen and purpose of reach.Operation to the following four stages of operation (Figure 1). Stage A: Well distribution of the sewage ditch into the Ditch I, interim ditch running low brush, on
7、ly to maintain the activated sludge mixture of suspended state； dissolved oxygen concentration of less than 0.5 mg/l, in a state of hypoxia, so that the former An aerobic phase of the nitrate to raw sewage as carbon source for denitrification.At this point, I ditch behind the overflow weir open, mud
8、dy mixture into this two-person pool for precipitation separation, and in the ditch II to the high-speed brush aeration, into one of the previous phase of the sewage in Amoy good Oxygen state (D0 2mg/l) for nitrification. Stages of the run-time for 15 min. Phase B: the distribution of sewage are sti
9、ll people well into the grooveI,DitchI,II maintained ditch on the stage of the anti-nitrification, nitrification state. But the water from the ditch I read the Amoy II, guarantee people into the ditch II of the sewage pollution in the organic material is fully degradable. The stage for the run-time
10、105 min. Stage C: Well into the distribution of the sewage ditch II. At this point ditch II interim low brush then pushed into the flow of denitrifying state. To the water. I ditch and high-speed transit brush aeration, nitrification. The stage for the running time 15 min. Stage D: D stage of the op
11、eration and status similar to stage B, only Ditch I, iI into the ditch, the water situation in the opposite. The stage of the running time for 105 min Process in the course of the operation. Well distribution, Brush, overflow weir by the pre-set time control operation. In addition, Brush also be ins
12、talled in each groove of dissolved oxygen analyzer control. Figure 1 Biological nitrogen removal opertation mode 2、 DE-oxidation ditch biological phosphorus removal process Phosphorus is essential microbial metabolism of nutrients, microbial cells is composed of part, by ADP and adenosine triphospha
13、te (ATP) of each other to provide energy to achieve conversion of synthesis. Rely mainly on the removal of phosphorus-phosphate of energy exchange in the process of absorbing phosphorus, and polymerization in the form of phosphorus in the body. Anaerobic state,These bacteria will be in polymerizatio
14、n of phosphorus to PO43-P in the form of a release in aerobic or oxygen sha state, the P-Han and respiration through the absorption of sewage in the PO43-P, a polymerization of phosphorus in the form of Synthesis of the cell. DE-oxidation ditch the biological phosphorus removal is the basis of this
15、mechanism, set up in the oxidation ditch before anaerobic pond, Thus forming anaerobic January 1 January 1 hypoxia aerobic processes (Figure 2), and created a conducive to the best of phosphorus operating conditions. The system of anaerobic pond by the three ditches group. HRT for lh. Diving pool in
16、stalled blender, sewage sludge and returning well-mixed.- P because of the need to completely anaerobic conditions can be fully in the polymerization of phosphorus released, if the pool NO3-,containing excessive, it will affect the efficiency of phosphorus, in the first Gounei contain NO3-， the Retu
17、rn to the use of sewage sludge as carbon source for a more thorough response to the denitrificationTo ensure that phosphorus in the second, three in the Amoy been fully released. The distribution of sewage into the wells after the people oxidation ditch, In the aerobic and anoxic conditions (aerobic state of maximum efficiency of absorption), the release of phosphorus has been activated sludge absorption, and then people into the sedimentation tank precipitation, Sheng after the remaining sludge from, in addition to this The purpose of phosphorus.
