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

body. Anaerobic state,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 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 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, in 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 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.

Figure 2 Bilogical phosphours remonal process

中文译文

DE型氧化沟生物脱氮除磷工艺

1、DE型氧化沟生物脱氮工艺

氮是植物生长的一种必不可少的营养成分，但是如果水体中氮的含量过高，就会产生富营养化，使溶解氧含量降低，藻类生长泛滥，加速水体天然老化过程。另外，以硝酸盐形式存在的氮被认为是引起婴幼儿的一种暂时性白血病—高铁血红蛋白症的根源。因此，对于将流入饮用水的水源很有必要脱氮。

氧化沟生物脱氮是首先由自养型好氧微生物在好氧状态下，利用混合液中的溶解氧通过硝化反应将氨氮氧化为硝酸盐，再由异养微生物在缺氧状态下在反硝化细菌的作用下，利用硝酸盐中的氧产生反硝化作用将硝酸盐中的氮转化为氮气释放出去。

硝化反应式为：

消化细菌

NH

4+1.86+O

2

1.985+HCO

3

0.021C

5

H

7

O

2

N+1.044H

2

O+1,881H

2

CO

3

+0.98NO

3

-

反硝化反应式为：

反消化细菌

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

-

反消化菌

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型氧化沟的脱氮作用是通过特殊的运行方式，在两条沟内交替创造硝化和反硝化反应的条件。而达到脱氮目的。运行方式按以下四个阶段运行

(如图1 )。

阶段A ：污水经分配井进人沟I，沟中转刷低速运行，仅保持活性污泥混合液的悬浮状态，溶解氧浓度低于0.5mg/l,处于缺氧状态,从而使得经前一好氧阶段产生的硝酸盐以原污水为碳源进行反硝化反应。此时，沟I后端的溢流堰打开，泥水混合液由此进人二沉池进行沉淀分离，而沟II中的转刷进行高速曝气，将前一阶段进人该沟的污水在好氧状态下(D0>2 mg/l)进行硝化反应。该阶段的运行时间为 15min。

阶段B：污水仍经分配井进人沟I，沟I、沟II均保持上阶段的反硝化、硝化状态。但水由沟I改为沟II，保证进人沟II的污水中有机污染物质得到充分降解。该阶段运行时间105min。

阶段C：污水经分配井进入沟II。此时沟II中转刷低速推流进入反硝化状

态,进行出水。而沟I中转刷高速曝气，进行硝化反应。该阶段运行时间为 15min。

阶段D：阶段 D的运行状态与阶段 B相似，只是沟I、沟II进、出水情况相反。该阶段的运行时间为105min。

上述工艺运行过程中。分配井、转刷、溢流堰由预先设定的时间控制运行。另外，转刷还受安装在每条沟的溶解氧测定仪控制。

图1 生物脱氮运行方式

2、DE型氧化沟生物除磷过程

磷是微生物新陈代谢所必需的营养元素，既是微生物体细胞组成的一部分，又通过二磷酸腺苷(ADP)和三磷酸腺苷(ATP)的相互转换提供能量来实现细胞合成。

磷的去除主要依靠聚磷菌在能量交换过程中吸收磷，并以聚合磷的形式存在

3-—P的形式释放出来；在于体内。在厌氧状态下，这些细菌将体内聚合磷以PO

4

3-—P，以聚合磷的好氧或缺氧状态下，聚磷菌又通过呼吸作用吸收污水中的PO

4

形式存在于体中进行细胞合成。

DE型氧化沟的生物除磷就是根据这个机理，在氧化沟前设置厌氧进水池，从而形成厌氧—缺氧—好氧的工艺流程( 如图2 ) ，创造了有利于生物除磷的最佳运行条件。

该系统中厌氧池由三个沟渠组成，水力停留时间为lh。池中安装潜水搅拌器，使污水与回流污泥充分混合。因为聚磷菌必须在完全厌氧的条件下才能够将

-的含量过大，会影响除磷的效率，所体内的聚合磷充分释放出来，如果池中 NO

3

-的回流污泥利用污水作碳源进行较彻底的脱硝反应，从以在第一条沟内含有NO

3

而保证磷在第二、三条沟内得以充分释放。污水经分配井进人氧化沟后，在缺氧

和好氧的状态下( 好氧状态下吸收效率最高) ，释放出来的磷又被活性污泥吸收，随后进人二沉池沉淀，最后随剩余污泥排出，以此达到除磷的目的。

图2 生物除磷工艺