A method for reducing total phosphorus content in sewage

A phosphorus content and sewage technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of large area of ​​artificial wetland, unstable phosphorus removal effect, and sensitivity to changes in process conditions and other problems, achieve excellent phosphorus removal effect, meet the needs of equipment transformation, and achieve the effect of low price

Active Publication Date: 2018-02-09
苏州森荣环保处置有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, these existing phosphorus removal methods still have certain defects, such as the traditional biological method that is most widely used in sewage treatment plants (stations), although it has the advantages of simple operation and low price, its effect on phosphorus The removal effect is not good, and it is sensitive to changes in process conditions. At the same time, once the sludge in the biological method is in an anaerobic state, phosphorus will also be released; the constructed wetland occupies too large an area, and the effect is not easy to show. Moreover, the local climate and environment have a great influence on the plants in the constructed wetland, making the constructed wetland unable to stably exert the phosphorus removal effect
[0004] In view of this, the chemical method is of great help to the upgrading and transformation of sewage treatment plants (stations) or treatment plants (stations) with high treatment requirements; however, the current chemical method has a large dosage and poor effect question

Method used

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  • A method for reducing total phosphorus content in sewage
  • A method for reducing total phosphorus content in sewage
  • A method for reducing total phosphorus content in sewage

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1 A method for reducing total phosphorus content in sewage:

[0028] In this embodiment, aluminum sulfate and polyaluminum sulfate are all added to the outlet end of the contact oxidation tank, and the process flow diagram is as follows figure 1 shown; figure 1 Middle: 1-oxidation tank, 2-aeration pipe, 3-outlet weir, 4-phosphorus removal agent 1 metering pump, 5-phosphorus removal agent 1 dosing box, 6-phosphorus removal agent 1 stirring head, 7-phosphorus removal Agent 2 metering pump, 8- phosphorus removal agent 2 dosing box, 9- phosphorus removal agent 2 stirring head, 10- phosphorus removal agent 1 stirring motor, 11- phosphorus removal agent 2 stirring motor.

[0029] Prepare an aqueous aluminum sulfate solution with a mass concentration of 40 g / L as phosphorus removal agent 1. Add the prepared aqueous aluminum sulfate solution at the outlet of the contact oxidation tank. The volume ratio of the added aqueous aluminum sulfate solution to the sewage to ...

Embodiment 2

[0035] Embodiment 2 A method for reducing total phosphorus content in sewage:

[0036] The difference from Example 1 is that the mass concentration of the aluminum sulfate aqueous solution is 70 g / L, and the volume ratio of the added aluminum sulfate aqueous solution to the sewage to be treated is 0.0048:1; the mass concentration of the polyaluminum sulfate solution is 50 g / L, the volume ratio of the added polyaluminum sulfate aqueous solution and the sewage to be treated is 0.00048:1; the specific test results are shown in Table 2; as can be seen from Table 2, using the method of this embodiment, the total phosphorus in the treated water sample The content can reach the standard stably, and the removal rate of total phosphorus in sewage remains above 99.43%.

[0037] The detection result of table 2 embodiment 2

[0038]

Embodiment 3

[0039] Embodiment 3 A method for reducing total phosphorus content in sewage:

[0040] The difference from Example 1 is that the mass concentration of the aluminum sulfate aqueous solution is 5 g / L, and the volume ratio of the added aluminum sulfate aqueous solution to the sewage to be treated is 0.00192:1; the mass concentration of the polyaluminum sulfate aqueous solution is 25 g / L, the volume ratio of the added polyaluminum sulfate aqueous solution and the sewage to be treated is 0.00024:1; the specific test results are shown in Table 3; as can be seen from Table 3, by adopting the method of this embodiment, the total phosphorus in the treated water sample The content can reach the standard stably, but the total phosphorus content in the treated water sample is very close to the standard requirement of 0.5 mg / L, and the removal rate of total phosphorus in sewage remains above 96.8%.

[0041] The detection result of table 3 embodiment 3

[0042]

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Abstract

The invention discloses a method for reducing the total phosphorus content in sewage, which adopts a contact oxidation treatment process, and further includes the following treatment steps: preparing an aluminum sulfate aqueous solution with a mass concentration of 5-70 g / L as a phosphorus removal agent 1; The aqueous solution of polyaluminum sulfate with a concentration of 25-50 g / L is used as the phosphorus removal agent 2; the prepared phosphorus removal agent 1 is added to the water at the outlet of the contact oxidation tank, and stirred by the aeration of the contact oxidation tank to make the aluminum ions and the water Phosphate root reacts: add phosphorus removal agent 2 at the outlet of the contact oxidation tank or at the inlet of the sedimentation tank. The method of the invention has the characteristics of simple operation, less dosing, low cost, and no other pollution; the method of the invention improves the treatment process of the contact oxidation method, so that the removal rate of total phosphorus in sewage increases from 2.40% to 99.47% %, has a good treatment effect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and relates to a method for reducing the total phosphorus content in sewage. Background technique [0002] As of the end of June 2013, a total of 3,479 urban sewage treatment plants have been built in cities and counties across the country, with a sewage treatment capacity of 145.47 million m 3 / sky. But at the same time, there are still many enterprises whose sewage treatment stations directly enter the rivers, lakes and seas, causing serious water pollution; phosphorus is one of the main culprits of water pollution, if excessive phosphorus is contained in sewage, it will cause algae and other planktonic The rapid reproduction of organisms reduces the dissolved oxygen in the water body and deteriorates the water quality; with the introduction of the new environmental protection law and the increasingly severe environmental situation, if the sewage treatment plant cannot control the tota...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/72
Inventor 叶蕾向星刘虎焦洋于家骏
Owner 苏州森荣环保处置有限公司
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