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Method for removing and recycling nitrogen and phosphor in municipal sewage by spirogyra-biological film system

A biofilm system and urban sewage technology, applied in the field of urban sewage treatment, can solve the problems of complex operation technology, non-recovery of nitrogen and phosphorus, low nitrogen and phosphorus removal rate, etc., to achieve the effect of enhancing biodegradation and reducing treatment costs

Inactive Publication Date: 2009-08-12
HARBIN INST OF TECH
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Problems solved by technology

[0003] In order to solve the problems of high operating cost, complex operation technology, low removal rate of nitrogen and phosphorus in sewage, and non-recyclable nitrogen and phosphorus in urban sewage in the current urban sewage treatment system, the present invention provides a Spirogyra-biofilm system to remove and recycle urban waste water. Methods of Nitrogen and Phosphorus in Sewage

Method used

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  • Method for removing and recycling nitrogen and phosphor in municipal sewage by spirogyra-biological film system

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 To illustrate, the Spirogyra-biofilm system of this embodiment removes and recycles the method for nitrogen and phosphorus in urban sewage according to the following steps: the pretreated urban sewage flows through the Spirogyra-biofilm system, and the Spirogyra-biological The hydraulic retention time in the membrane system is 2 to 7 days, that is, the process of removing and recovering nitrogen and phosphorus in urban sewage is completed; Spirogyra-biofilm system consists of oxidation pond 5 and cultivation pond 1, and oxidation pond 5 is arranged Spirogyra 2 and biofilm 4 are arranged, and Spirogyra 2 and biofilm 4 adopt the "upper-down" combination method. Spirogyra 2 is arranged on the water surface of oxidation pond 5, and the bottom of Spirogyra 2 is supported and fixed by plastic grid 3. The biofilm 4 is vertically arranged under the grid 3, the water flow mode of the oxidation pond 5 is bottom-in and top-out, an...

specific Embodiment approach 2

[0016] Specific embodiment two: the difference between this embodiment and specific embodiment one is: Spirogyra-biofilm system is made up of oxidation pond and cultivation pond, is arranged in oxidation pond and is arranged with biofilm, arranges and cultivates Spirogyra in the cultivation pond, Spirogyra in the oxidation pond is replaced every 5 to 10 days. Other steps and parameters are the same as in the second embodiment.

specific Embodiment approach 3

[0017] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the hydraulic retention time in the oxidation pond is 2 to 7 days. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a method for removing and recovering nitrogen and phosphorous in municipal sewage by using a spirogyra-biological film system, in particular to a treatment method of municipal wastewater. The invention aims to solve the problems of the prior municipal wastewater treatment system such as high operating cost, complicated operation technique, low nitrogen and phosphorous removal rate in the sewage and nonrecoverable nitrogen and phosphorous in the municipal sewage. The method comprises the following steps: passing through the pretreated municipal sewage, flowing across the spirogyra-biological film system, ensuring that the hydraulic detention period in the spirogyra-biological film system is 2 to 7 days and finally finishing removing and recovering the phosphorous and the nitrogen in the municipal sewage. The method has strong removal capacity for the nitrogen and the phosphorous in the sewage and convenient operation, facilitates the deep treatment of the sewage, and reduces 60 to 70 percent of sewage treatment cost; and meanwhile, the spirogyra enriched with the nitrogen and the phosphorous can be used as fertilizers and can generate good economic benefit.

Description

Technical field: [0001] The invention relates to a method for treating urban sewage. Background technique: [0002] With the rapid improvement of people's living standards and the acceleration of urbanization, a large amount of sewage has been discharged into rivers in cities, among which nitrogen and phosphorus pollution is serious, leading to eutrophication of water bodies and increasingly serious water environment pollution. At present, the technology for removing nitrogen and phosphorus in urban sewage has the problems of high operating cost of water treatment system, complicated operation technology, low removal rate of nitrogen and phosphorus in sewage, and non-recoverable nitrogen and phosphorus in urban sewage. Invention content: [0003] In order to solve the problems of high operating cost, complex operation technology, low removal rate of nitrogen and phosphorus in sewage, and non-recyclable nitrogen and phosphorus in urban sewage in the current urban sewage tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32C02F9/14C02F3/12C02F1/52
CPCY02W10/10
Inventor 马军雷国元
Owner HARBIN INST OF TECH
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