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： N i t r i f yi ng b a c t e r i a NH 4 + 1.86+O 2 1.985+HCO 3 0.021C 5
5、H 7 O 2 N+1.044H 2 O+1,881H 2 CO 3 +0.98NO 3 - Denitrification-as： D e ni t r i f yi ng b a c t e r i a NO 3 - +1.08CH 3 OH+0.24H 2 CO 3 0.056C 5 H 7 O 2 N+0.47N 2 +1.68H 2 O+HCO 3 - D e ni t r i f yi ng b a c t e r i a NO 3 - +0.67CH 3 OH+0.53H 2 CO 3 0.04C 5 H 7 O 2 N+0.48N 2 +1.23H 2 O+HCO 3 - DE
6、-oxidation ditch the dechlorination role 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
7、 I, interim ditch running low brush, only 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 d
8、itch behind the overflow weir open, muddy 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. Phas
9、e B: the distribution of sewage are still people well into the groove I,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 full
10、y degradable. The stage for the run-time 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 runnin
11、g time 15 min. Stage D: D stage of the operation 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
12、operation. In addition, Brush also be installed 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
13、 of part, by ADP and adenosine triphosphate (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 stat
14、e,These bacteria will be in polymerization 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
15、 phosphorus removal is the basis of this 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
16、ditches group. HRT for lh. Diving pool installed 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, i
17、n the first Gounei contain NO3-， the Return to the use of sewage sludge as carbon source for a more through response to the denitrification to 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 t
18、he 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. Figure 2 Bilogical phosphours remonal process
