Efficient biochemical nitrogen and phosphorus removal method for waste water

A technology for denitrification, dephosphorization, and wastewater, applied in the field of environmental engineering, can solve the problems that anaerobic tanks cannot guarantee an absolute anaerobic environment, the dephosphorization effect is difficult to be further improved, and the sludge fully absorbs phosphorus. and recycling rate, low operating cost, stable phosphorus removal effect

Active Publication Date: 2015-04-29
江苏艾特克环境工程设计研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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. In addition, the mixed solution entering the sedimentation tank usually needs to maintain a certain concentration of dissolved oxygen to prevent the precipitation in the sedimentation tank. Denitrification and sludge anaerobic phosphorus release, but this will cause a certain amount of dissolved oxygen in the return sludge and return mixed liquor to affect anaerobic phosphorus release. At the same time, only a part of the remaining sludge discharged from the system has undergone a complete anaerobic and aerobic pro

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  • Efficient biochemical nitrogen and phosphorus removal method for waste water
  • Efficient biochemical nitrogen and phosphorus removal method for waste water
  • Efficient biochemical nitrogen and phosphorus removal method for waste water

Examples

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Example Embodiment

[0038] Example 1

[0039] An enterprise in the Taihu Lake Basin Chemical Park selects the improved A of the present invention 2 The / O denitrification and dephosphorization process denitrifies and dephosphorizes the wastewater entering the municipal sewage treatment pipe network. The quality of the influent wastewater is shown in Table 2. All indicators seriously do not meet the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" "(GB18918-2002 Discharge requirements of the first-level standard A. 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 2 Water quality of influent wastewater

[0041] water quality index

[0042] Table 3 Experimental Conditions

[0043]

[0044] The specific process steps are as follows:

[0045] The wastewater from a certain enterprise in the Taihu Lake Basin Chemical Park entering...

Example Embodiment

[0050] Example 2

[0051] With the same influent wastewater quality and specific experimental conditions as in Example 1, the treated water obtained from the effluent from the sedimentation tank was used for testing again after 2 months of operation.

[0052] The specific process steps are as follows:

[0053] 1), the anaerobic reaction section: mainly in the anaerobic reaction tank 2 to release phosphorus, the wastewater 1 containing nitrogen and phosphorus enters the anaerobic reaction tank 2, and at the same time enters the backflow activated sludge 9 from the sedimentation tank 4, The phosphorus accumulating bacteria in the reflux activated sludge 9 release phosphorus in an anaerobic environment, and the zeolite in the anaerobic reaction tank 2 enriches the ammonia nitrogen in the wastewater 1 through adsorption; Phosphorus bacteria can fully release phosphorus, store a large amount of energy substances in the body, so as to absorb phosphorus excessively under the conditi...

Example Embodiment

[0058] Example 3

[0059] With the same influent wastewater quality and specific experimental conditions as in Example 1, the treated water obtained from the effluent from the sedimentation tank was used for testing again after 2 months of operation.

[0060] The specific process steps are as follows:

[0061] 1), anaerobic reaction section: mainly release phosphorus in the anaerobic reaction tank 2, the wastewater 1 containing nitrogen and phosphorus enters the anaerobic reaction tank 2, and at the same time enters the backflow activated sludge 9 from the sedimentation tank 4, The phosphorus-accumulating bacteria in the reflux activated sludge 9 release phosphorus in an anaerobic environment, and the zeolite in the anaerobic reaction tank 2 enriches the ammonia nitrogen in the wastewater 1 through adsorption; Phosphorus bacteria can fully release phosphorus, store a large amount of energy substances in the body, so as to absorb phosphorus excessively under the condition of s...

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Abstract

The invention discloses an efficient biochemical nitrogen and phosphorus removal method for waste water. Ammonia nitrogen and phosphorus in waste water are efficiently removed by combining a modified A2/O biological nitrogen and phosphorus removal technology and a chemical method, namely, zeolite adsorbing ammonia nitrogen method; the denitrification liquid flowing out from an anoxic denitrification tank enters an aerobic nitration tank to form internal circulation; the residual denitrification liquid directly enters a sedimentation tank for solid-liquid separation; phosphorus-accumulating bacteria directly flows back to an anaerobic tank from the sludge of a sedimentation tank, and then enters the anoxic nitration tank. Ion adsorption and biological regeneration treatment are combined; water outlet total nitrogen is less than or equal to 5 mg/L; the removal ratio of total nitrogen and total phosphorus is more than 90%; requirements that water outlet total nitrogen in Taihu basin chemical engineering zone is superior to the primary standard, namely, the A standard, of the urban sewage treatment plant pollutant discharge standard (GB18918-2002) are met stably.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for highly efficient biochemical denitrification and dephosphorization of wastewater. Background technique [0002] The wastewater discharged by enterprises in the chemical industry park in the Taihu Lake Basin has complex water quality, large fluctuations in water quality, and many refractory substances. Nitrogen and phosphorus elements exist as nutrients in large quantities, and their biodegradability is extremely poor. Simple and imperfect, there are many problems. The effluent pollutant index is high, which leads to water pollution and has a great impact on aquatic organisms and the surrounding environment. In this regard, the Taihu Basin Chemical Industry Park requires enterprises to strictly implement the first-level A standard (especially TN≤5mg / L) of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18919-2002)...

Claims

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Application Information

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IPC IPC(8): C02F9/14
CPCC02F1/52C02F3/02C02F3/28C02F3/302C02F3/307C02F3/308C02F9/00C02F2101/105C02F2101/16C02F2101/163C02F2101/166C02F2301/08
Inventor 吴智仁谢菁蒋素英徐畅张波
Owner 江苏艾特克环境工程设计研究院有限公司
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