外文翻译---DE型氧化沟生物脱氮除磷工艺

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 reduce, 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 Liuren 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 heterotrophic 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

NH4+1.86+O21.985+HCO3 0.021C5H7O2N+1.044H2O+1,881H2CO3+0.98NO3-

D enitrification-as：

Denitrifying bacteria

NO3-+1.08CH3OH+0.24H2CO30.056C5H7O2N+0.47N2 +1.68H2O+HCO3-

Denitrifying bacteria

NO3-+0.67CH3OH+0.53H2CO30.04C5H7O2N+0.48N2 +1.23H2O+HCO3-

DE-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 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 ditch 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.

Phase 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 fully 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 running 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 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 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