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Method for removing and recycling phosphorus from sewage based on aerobic granular sludge

A technology of aerobic granular sludge and granular sludge, applied in water/sludge/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve problems such as high cost, large land occupation, and complicated operation , to achieve the effect of saving medicine costs, simplifying complexity, and reducing floor space

Active Publication Date: 2016-12-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the phosphorus removal and phosphorus recovery process of sewage treatment plants using flocculent sludge has problems such as complex operation, high cost, large land occupation, and large sludge output.

Method used

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  • Method for removing and recycling phosphorus from sewage based on aerobic granular sludge
  • Method for removing and recycling phosphorus from sewage based on aerobic granular sludge
  • Method for removing and recycling phosphorus from sewage based on aerobic granular sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: the removal and recovery system of sewage phosphorus based on aerobic granular sludge, such as figure 1 As shown, it mainly includes four parts: anaerobic-aerobic-sedimentation-granular sludge selection, and adopts continuous operation; influent mixing zone 06 is adjacent to anaerobic zone 01, anaerobic zone 01 is adjacent to aerobic zone 02, and aerobic zone 02 is connected to the sedimentation tank 03, and the sedimentation tank 03 is connected to the granular sludge selector 04, and the granular sludge selector 04 is connected to the influent mixing zone 06 through the granular sludge return system 05; among them, the agitator 07 is set in the anaerobic zone 01 , the aerobic zone 01 is equipped with an aeration system 08, the aeration system 08 is connected with the blower 09, and the granular sludge selector 04 is provided with a granular sludge discharge port 10.

[0016] as attached figure 1 , the anaerobic zone 01 maintains an anaerobic state, and ...

Embodiment 2

[0018] Example 2: The method used in this example is as in Example 1, wherein the nutrient ratio C:N:P in the influent water is 100:20:4, the hydraulic retention time of the anaerobic zone 01 is controlled for 1 to 3 hours, and the aerobic zone 02 is controlled. The hydraulic retention time is 3-6 hours, and the hydraulic retention time of granular sludge selection zone 04 is 0.2-1 hour; the pH of anaerobic zone 01 and aerobic zone 02 is controlled to be 7.5-7.8. At this time, the system excludes the high concentration of phosphorus and calcium in the granular sludge, such as image 3 As shown, the inside of the particle is denser, cocci and brevibacteria are dominant, the phosphorus content of the sludge is 16.25%, and the calcium content is 25.28%.

Embodiment 3

[0019] Example 3: The method used in this example is as in Example 1. Granular sludge and flocculent sludge are inoculated into the reactor according to the TSS ratio of 2:1, and the MLSS is 3500 mg / L; the nutrient ratio in the influent is C: N: P is 100:10:4, the hydraulic retention time of control anaerobic zone 01 is 1-3 hours, the hydraulic retention time of aerobic zone 02 is 3-6 hours, and the hydraulic retention time of granular sludge selection zone 04 is 0.2-1 hour.

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Abstract

The invention discloses a method for removing and recycling phosphorus from sewage based on aerobic granular sludge. The method comprises the following steps: forming magnesium ammonium phosphate precipitate in the granular sludge in an anaerobic reaction zone, and additionally arranging a granular sludge selecting zone behind a secondary sedimentation tank for selecting granules with higher sedimentation rate, discharging the selected granules out of a system and recycling magnesium ammonium phosphate; refluxing the aerobic granular sludge which is enriched with phosphorus-accumulating bacteria into the anaerobic zone to release phosphorus, and forming the magnesium ammonium phosphate precipitate in the granules; subsequently, enabling the granular sludge mixed solution to pass through the aerobic zone, wherein the granular sludge absorb the phosphorus in the sewage excessively through the phosphorus-accumulating bacteria; after sludge is separated from water in the secondary sedimentation tank, enabling the granules to enter the granular sludge selecting zone, so that the magnesium ammonium phosphate-containing granular sludge with higher sedimentation rate is selected and discharged out of the system to recycle the phosphorus. According to the method disclosed by the invention, a phosphorus recycling system is simplified; the phosphorus is recycled by utilizing an aerobic granular sludge technology; the system is simple and energy-saving, and has practical application and popularization values on the transformation of a sewage phosphorus removal process.

Description

technical field [0001] The invention relates to a method for removing and recovering phosphorus from sewage based on aerobic granular sludge, and belongs to the technical field of wastewater biological treatment. Background technique [0002] As a non-renewable resource, phosphate rock resources are facing the problem of depletion. The domestic and foreign estimates of phosphate rock resources are 30 to 350 years of exploitable utilization. Therefore, rational mining and recycling of phosphate rock resources have become more and more popular at home and abroad more attention. Phosphorus is an important component of living matter and an indispensable nutrient element in the ecosystem. On the one hand, the phosphorus discharged with sewage causes a huge waste of phosphorus resources. On the other hand, the eutrophication of water caused by excessive discharge of phosphorus is an urgent need. Environmental problems solved. Phosphorus discharged into water bodies by people in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/10
CPCC02F3/301C02F3/308C02F2101/105
Inventor 暴瑞玲薛联青高成严晓菊
Owner HOHAI UNIV
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