Biochemical denitrifying method for wastewater

A waste water and denitrification technology, applied in the field of environmental engineering, can solve the problems that the denitrification effect is difficult to further improve, the biological denitrification sludge age is different, and the total nitrogen removal rate is not high, so as to achieve low operating cost, reduce operation steps, and replenishment little effect

Active Publication Date: 2015-03-25
江苏艾特克环境工程设计研究院有限公司
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Problems solved by technology

However, under such process conditions, since the nitrification liquid in the aerobic nitrification tank directly enters the sedimentation tank for precipitation and separation, the effluent contains nitrate nitrogen and nitrite nitrogen, resulting in a low removal rate of total nitrogen; In the sludge, only a part of the sludge has experienced a complete anoxic and aerobic process. The sludge age of the system sludge cannot be too short due to the growth of nitrifying bacteria, which makes it difficult to further improve the denitrification effect.
Therefore, the traditional A / O process usually has many technical problems such as nitrate nitrogen in the effluent, insufficient alkalinity, and different sludge ages required for biological denitrification. There is still a long way to go in accordance with the requirements of the first-level A standard (especially TN ≤ 5mg / L) of the National Waste Emission Standard (GB18918-2002).

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An enterprise in the chemical industry park in the Taihu Lake Basin selected the improved A / O biochemical denitrification process of the present invention to denitrify the wastewater entering the municipal sewage pipe network. Discharge requirements of the first-level standard A of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002).

[0037] Table 2 Water quality of influent wastewater

[0038] water quality index

Water temperature (℃)

pH

SS(mg / L)

BOD(mg / L)

TN (mg / L)

NH 3 -N (mg / L)

content

25

7.8

120

110

42

27

[0039] The specific experimental conditions are shown in Table 3. After 2 months of operation, the treated water obtained from the effluent of the sedimentation tank was tested again.

[0040] Table 3 Experimental conditions

[0041]

[0042] The specific process steps are as follows:

[0043] Such as figure 1 Shown, the method for biochemical denitr...

Embodiment 2

[0051] The same influent waste water quality and specific experimental conditions as in Example 1 were tested again with the treated water obtained from the effluent of the sedimentation tank after 2 months of operation.

[0052] The specific process steps are as follows:

[0053] 1), anoxic denitrification section: mainly in the anoxic denitrification tank 3 for denitrification and organic matter degradation, nitrogen-containing wastewater 1 enters the anoxic denitrification tank 2, and at the same time enters the nitrogen-containing wastewater 1 from the aerobic nitrification tank 4. The nitrifying liquid 5 of nitrate nitrogen is stirred to make the mud in the anoxic denitrification tank be in a suspended flow state; the activated sludge containing denitrifying bacteria and zeolite coexist in the anoxic denitrification tank 2, and the zeolite absorbs nitrogen-containing wastewater 1 ammonia nitrogen, under anoxic conditions, organic matter is oxidized and degraded by denitri...

Embodiment 3

[0057] The same influent waste water quality and specific experimental conditions as in Example 1 were tested again with the treated water obtained from the effluent of the sedimentation tank after 2 months of operation.

[0058] The specific process steps are as follows:

[0059] 1), anoxic denitrification section: mainly in the anoxic denitrification tank 3 for denitrification and organic matter degradation, nitrogen-containing wastewater 1 enters the anoxic denitrification tank 2, and at the same time enters the aerobic nitrification tank 4 The nitrifying liquid 5 containing nitrate nitrogen is stirred to make the mud in the anoxic denitrification tank be in a suspended flow state; the activated sludge containing denitrifying bacteria and zeolite coexist in the anoxic denitrification tank 2, and the zeolite absorbs nitrogen-containing wastewater 1 Under anoxic conditions, the organic matter is oxidized and degraded by using nitrate as an electron acceptor under the action o...

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Abstract

The invention dislcoses a biochemical denitrifying method for wastewater. According to the biochemical denitrifying method, an improved A/O biochemical denitrifying process is combined with a chemical method (namely a zeolite adsorption ammonia nitrogen method) to efficiently remove ammonia nitrogen in wastewater, denitrification liquid flowing from an anoxic denitrification tank enters an aerobic nitrification tank to form internal circulation, and residual denitrification liquid directly enters a sedimentation tank to be subjected to solid-liquid separation; by combining ionic adsorption with biologic regeneration, total nitrogen in effluent water is less than or equal to 5mg/L, the removal rate of total nitrogen is higher than 90%, and thus the requirement that total nitrogen in effluent water of a chemical industrial park of a Tai Lake area is superior to the standard A of 'discharge standard of pollutants for municipal wastewater treatment plant' (GB18918-2002) is stably met.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for biochemical denitrification of wastewater. Background technique [0002] With the rapid economic development of the Taihu Lake Basin, the amount of wastewater discharged by chemical and other industries is increasing, the water quality is complex, nitrogen exists as a nutrient element in large quantities, the wastewater is difficult to degrade, has high salinity, and poor biodegradability, which is the cause of nitrogen pollution in the Taihu Lake Basin. The main source, thus causing serious eutrophication and pollution of Taihu Lake water, leading to the outbreak of blue-green algae. Water pollution has brought serious harm to aquatic organisms and the surrounding environment. In response to this problem, combined with special investigation results, the environmental protection department of Jiangsu Province organized and formulated the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30
CPCC02F1/281C02F3/302C02F2303/16C02F2305/06
Inventor 徐畅蒋素英谢菁吴智仁
Owner 江苏艾特克环境工程设计研究院有限公司
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