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Method for treating urban sewage through denitrifying process for phophorous removal and defluorination

A technology for denitrification and phosphorus removal and urban sewage treatment is applied in the field of denitrification, phosphorus and nitrogen removal to treat urban sewage, which can solve problems such as inability to continue, and achieve the effects of reducing hydraulic retention time, improving nitrification efficiency, and saving carbon sources.

Inactive Publication Date: 2004-10-27
GUANGZHOU UNIVERSITY
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Problems solved by technology

[0006] 4. The nitrification process provides nitrate for the denitrification process, but when the nitrification process itself has too much nitrate, it will inhibit the nitrification process and make the whole process unable to continue;

Method used

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  • Method for treating urban sewage through denitrifying process for phophorous removal and defluorination

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Embodiment Construction

[0026] The sewage to be treated is urban domestic sewage, and the sewage treatment steps are as follows:

[0027] 1. Water intake period: the raw water alternately enters the first-stage reactors A and B at intervals of 4 hours;

[0028] 2. Anaerobic period: the raw water is anaerobically circulated in A and B for 2 hours to release phosphorus;

[0029] 3. Standing internal water change period: After the first-stage reactor undergoes anaerobic circulation, it is left to settle for 0.5 hours, and the supernatant with high concentration of phosphorus is discharged into the second-stage reactor at night;

[0030] 4. Nitrification reaction period: In the second-stage reactor, the high-phosphorus water from the first-stage reactor after static precipitation undergoes aerobic aeration for 3.5 hours to carry out nitrification reaction;

[0031] 5. Reflux in the nitrification liquid: After the nitrification reaction is completed, the second-stage reactor is left to settle for 30 minu...

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Abstract

A process for treating city sewage by denitrating, removing phosphorus and dnitrifying includes 8 steps including inputting raw sewage in reactors A and B alternatively by 4 hr, anaerobic circulating in A and B for 2 hrs in order to release phosphorus, laying A aside for 0.5 hr, discharging its supernatant in B, etc. Its advantages are use of denitrating phosphorus-collecting bacteria for removing phosphorus and nitrogen, and high treating effect.

Description

technical field [0001] The invention relates to the field of sewage treatment, and more specifically relates to a method for treating urban sewage through denitrification, phosphorus and nitrogen removal by combining sequenced batch activated sludge and sequenced batch biofilm method. Background technique [0002] In recent years, with the rapid development of the economy, the requirements for environmental quality are getting higher and higher. Urban sewage treatment technology has made great progress. With the continuous improvement of the requirements for phosphorus and nitrogen removal, the activated sludge method of urban sewage treatment process has obtained a development process from theory to practice. The adsorption-biodegradation method (AB method) with phosphorus and nitrogen removal effects, Anaerobic-aerobic method (AO method), anaerobic-anoxic-aerobic method (A 2 O method), oxidation ditch method, and sequencing batch activated slud...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F9/02C02F9/14
CPCY02W10/10
Inventor 方茜张可方荣宏伟
Owner GUANGZHOU UNIVERSITY
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