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Composite dephosphorizing coagulant for secondary effluent of sewage treatment plant and treatment method

A sewage treatment plant, secondary effluent technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of difficulty, strict operation and poor operation stability of biological phosphorus removal process, and achieve low cost and small operation. Cost, the effect of the best treatment effect

Active Publication Date: 2012-10-17
国家城市给水排水工程技术研究中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used phosphorus removal methods mainly include chemical methods and biological methods. Biological phosphorus removal is based on the principle that phosphobacteria extract and release phosphorus under aerobic and anaerobic conditions. Phosphorus, the biological phosphorus removal process has poor operational stability and strict operation, and it is difficult to reduce the total phosphorus content (TP) in sewage to 0.5mg / L or even below 0.2mg / L by simply using biological phosphorus removal methods

Method used

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  • Composite dephosphorizing coagulant for secondary effluent of sewage treatment plant and treatment method
  • Composite dephosphorizing coagulant for secondary effluent of sewage treatment plant and treatment method
  • Composite dephosphorizing coagulant for secondary effluent of sewage treatment plant and treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take by weighing 1000g polyaluminum chloride, 4600g aluminum sulfate and 47.6g sodium metasilicate respectively, dissolve in 10L water, stir and mix and configure the total effective content (the effective content of polyaluminum chloride and aluminum sulfate is expressed as Al 2 o 3 Calculated, the effective content of sodium metasilicate is SiO 2 meter) with a mass concentration of 10% compound phosphorus removal coagulant.

Embodiment 2

[0031] Take by weighing 3200g polyaluminum chloride, 100g ferric chloride and 47.6g sodium metasilicate respectively, dissolve in 10L water, stir and mix and configure total effective content (the effective content of polyaluminum chloride is expressed in terms of Al 2 o 3 In terms of, the effective content of ferric chloride is Fe 2 o 3 Calculated, the effective content of sodium metasilicate is SiO 2 meter) with a mass concentration of 10% compound phosphorus removal coagulant.

Embodiment 3

[0033] Use the composite dephosphorization coagulant prepared in Example 1 to treat the secondary effluent. The secondary effluent comes from Hefei Wangxiaoying Sewage Treatment Plant. Table 1 is the average monthly water quality characteristics of 12 months in 2008: (wherein CODcr: chemical oxygen demand; SS: suspended matter; TP: total phosphorus; BOD5: five-day biochemical oxygen demand; NH3-N: ammonia nitrogen; PH : pH)

[0034] Table 1: The average monthly secondary effluent water quality characteristics in 2008 Unit: mg / L

[0035] date

CODcr

SS

TP

BOD5

NH3-N

pH

2008.1

38.6

6.9

1.2

4.16

2.46

7.7

2008.2

38.8

6.0

1.1

4.48

2.05

7.7

2008.3

47.4

11.2

0.392

4.68

5.80

7.7

2008.4

71.4

19.1

0.609

11.54

5.25

7.7

2008.5

85.2

22.1

0.968

23....

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Abstract

The invention belongs to the field of environmental-protection sewage deep treatment and regenerated water comprehensive utilization and particularly relates to a composite dephosphorizing coagulant for secondary effluent of a sewage treatment plant and a deep treatment method. The composite dephosphorizing coagulant comprises the following main components: aluminium polychlorid, aluminum sulfateand sodium metasilicate, wherein the (effective) mass part ratio of the aluminium polychlorid to the aluminum sulfate to the sodium metasilicate is 0.3:0.65-0.70:0-0.05 or 0.95-0.97:0.03:0-0.02. The method for treating the secondary effluent of the sewage treatment plant by using the composite dephosphorizing coagulant comprises the steps of mixing, reacting, precipitating and filtering. In the invention, the preparation method of the used composite dephosphorizing coagulant is simple, the cost is low, phosphorus and suspended materials can be removed effectively, and the dephosphorizing and turbidity-removing effect is 30 percent higher than that of commonly used aluminium polychlorid.

Description

technical field [0001] The invention belongs to the field of advanced treatment of sewage and comprehensive utilization of regenerated water in environmental protection, and in particular relates to a compound dephosphorization coagulant and an advanced treatment method which can be used for secondary effluent of sewage treatment plants. Background technique [0002] In today's increasingly scarce water resources, sewage resource utilization is one of the solutions. Most of the sewage contains a certain amount of phosphates, which are extremely harmful to the ecological environment and are difficult to treat. Generally, phosphorus in the sewage of urban sewage treatment plants mainly exists in three states: organic phosphate, polyphosphate and orthophosphate , Phosphorus in the effluent after secondary treatment mainly exists in the form of soluble phosphorus, of which orthophosphate is the main one, accounting for about 70-90%. [0003] Commonly used phosphorus removal met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52
Inventor 朱开东尚巍黄鹏李金河
Owner 国家城市给水排水工程技术研究中心