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Sewage denitrification treatment system

A treatment system and denitrification technology, applied in the field of sewage treatment, can solve the problems such as the inability to take into account the uniformity of carbon sources used by microorganisms, the protection of the filter structure, the lack of a structure for adding carbon sources, and the blocking of filter layer gaps. The effect of saving carbon source, saving energy and moderate denitrification

Pending Publication Date: 2018-04-20
江苏道同环境科技有限公司
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Problems solved by technology

Since the nitrogen discharge rate of the filter layer in the denitrification deep bed filter has an upper limit, when the nitrogen gas generation rate is greater than the discharge rate, the nitrogen gas generated during the denitrification process will gradually accumulate in the filter layer, blocking the gaps in the filter layer, causing water to fail. Pass through the filter layer normally, that is, "air blockage" phenomenon occurs
The generation of air blockage is directly related to the concentration of nitrate nitrogen in sewage, which limits the application of sewage denitrification deep bed filters with high nitrate nitrogen content
[0004] In addition, the amount and accuracy of carbon source dosing in the denitrification deep bed filter directly affect the operating cost and denitrification effect of denitrification. Because the denitrification deep bed filter has excellent denitrification performance, after denitrification The content of total nitrogen after treatment in the deep bed filter is far lower than the national clean water drainage requirements, resulting in a large waste of production capacity
[0005] In the existing patent CN204803073U, a kind of denitrification deep bed filter structure applied to the advanced treatment of sewage is disclosed. In this patent, a backwash structure is used, which can use the backwashing structure when the denitrification deep bed filter occurs gas blockage. Direct air flow or water flow can dredge the filter layer, which can alleviate the air blockage phenomenon to a certain extent; but it lacks the structure of adding carbon source, and it cannot take into account the utilization of carbon source by microorganisms, the uniformity of carbon source in the filter, and the protection of the filter layer. Effects such as pool structure

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  • Sewage denitrification treatment system

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a kind of sewage denitrification treatment system of the present invention comprises denitrification deep bed filter tank 2, reflux system, backwash system, clear water tank 3, sewage tank 4, carbon source mixing tank 1, surpassing system, and PLC control system.

[0032] The denitrification deep bed filter 2 is composed of a quartz sand filter layer, a supporting layer and an air-water distribution layer from top to bottom, and the bottom of the air-water distribution layer is provided with a water collection tank 16; Count 17 and the distribution channel, and the weir plate is arranged around the distribution channel.

[0033] The clean water pool 3 and the sewage pool 4 are located on the water outlet side of the denitrification deep bed filter 2, and the water collection tank 16 is connected to the clean water pool 3 through the water outlet regulating valve; Connect the sewage tank 4. The filtered sewage flows into the sewage tank 4, a...

Embodiment 2

[0042] The filtering process of the mechanism in embodiment 1 is as follows:

[0043] Carbon source mixing process:

[0044] The sewage enters the carbon source mixing pool 1, and mixes the carbon source into the carbon source mixing pool 1. The agitator stirs the carbon source mixing pool 1. After the sewage and the carbon source are fully mixed, under the action of gravity, the mixed sewage flows into the denitrification deep bed filter 2 upper part of the water distribution tank or distribution channel, and overflow from the weir plate around the water distribution tank or distribution channel, and evenly distribute water to the denitrification deep bed filter 2; carbon source dosage is based on the influent NO 3 NO monitored by -N analyzer 3 -N content and effluent NO 3 -N analyzer feedback data determined.

[0045] Filtration and denitrification process of denitrification deep bed filter 2:

[0046] Sewage passes through the quartz sand filter layer, support layer, a...

Embodiment 3

[0060] On the basis of the structure of Embodiment 1, only the return system can be provided, and no overtaking system can be provided.

[0061] The following parameters can be used: system inlet NO 3 -N concentration 45mg / L, effluent NO 3 -N concentration is 8mg / L, denitrification filter influent NO 3 -N concentration 25mg / L, effluent NO 3 -N concentration 8mg / L, the excess water volume is 0, the return flow is 80% of the denitrification filter water output, and the total nitrogen removal rate of the system is 82.2%; the denitrification deep bed filter 2 quartz sand filter layer height is 2.44m, The particle size is 2-3mm, and the thickness of the supporting layer is 0.38mm-38mm; the denitrification deep bed filter 2 nitrogen flooding time interval is 2h; the backwashing cycle is 12h, air washing is 5min, air-water combined flushing is 12min, and water washing is 5min alone.

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Abstract

The invention relates to a sewage denitrification treatment system and belongs to the field of sewage treatment. The sewage denitrification treatment system comprises a denitrification deep-bed filterand a back-flow system, wherein the back-flow system is communicated with a water outlet side and a water inlet side of the denitrification deep-bed filter and leads clear water on the water outlet side into sewage on the water inlet side to dilute total nitrogen in the sewage. Therefore, the influence on denitrification from the total nitrogen concentration of sewage is reduced, the water inflowapplication range of the denitrification deep-bed filter is expanded, the gas block-up probability of the denitrification deep-bed filter is reduced, and the continuous denitrification time of the sewage denitrification treatment system is prolonged. Besides, the sewage denitrification treatment system is simple in design and can achieve the effect only by one loop system, so that the popularization of the system is improved, the commissioning cost of the system is lowered, the gas block-up probability and the probability that suspended particles block a filter layer are reduced, denitrification of the denitrification deep-bed filter is sufficient, accumulation of nitrite nitrogen is prevented, the utilization efficiency of the equipment is improved, and energy can be saved.

Description

technical field [0001] The invention relates to a sewage denitrification treatment system, which belongs to the field of sewage treatment. Background technique [0002] With the improvement of national discharge standards for sewage treatment plants, denitrification deep bed filters have been widely used due to their unique advantages. Compared with other processes, the denitrification deep bed filter process is simple, the effect is stable, the effluent water quality is good, the investment is small, the energy consumption is low, and it is economical and efficient. [0003] The denitrification deep bed filter mainly uses denitrification bacteria to use the carbon source in the water to first convert nitrate nitrogen into nitrogen gas, and complete the removal of total nitrogen in sewage. Since the nitrogen discharge rate of the filter layer in the denitrification deep bed filter has an upper limit, when the nitrogen gas generation rate is greater than the discharge rate, ...

Claims

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Application Information

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IPC IPC(8): C02F3/28
CPCC02F3/28C02F2209/005C02F2301/04C02F2305/06C02F2303/14
Inventor 轩妍
Owner 江苏道同环境科技有限公司
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