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Method for removing trace phosphorus by coagulant

A technology for removing water and traces, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage treatment, etc., can solve problems such as increasing the cost of chemicals, and achieve reduction in production, excellent pollution efficiency, and economical effect of cost

Inactive Publication Date: 2008-09-24
北京精密单因子水工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing studies have found that increasing the dosage of coagulants can improve phosphorus removal efficiency to a certain extent, but this will lead to a substantial increase in the cost of chemicals. In order to achieve the goal of biological stability of effluent water without increasing investment , it is necessary to find an effective way to enhance the effect of coagulation phosphorus removal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this example, the total phosphorus in the raw water is 190ug / L, the soluble phosphorus is 170ug / L, the turbidity is 12.5NTU, and the COD Mn 8.6mg / L, add deep dephosphorization coagulation aid to the raw water under the condition of full stirring, the coagulation aid is composed of 2mg / L potassium permanganate and 6mg / L ferrous sulfate, after rapid stirring for 3min, add conventional coagulation Aluminum sulfate 4mg / L, after conventional mixing, reaction, precipitation and filtration, the effluent turbidity is 0.5NTU, COD Mn 1.6mg / L, total phosphorus and dissolved phosphorus were not detected, and other indicators also reached the standard of GB5749-1985.

Embodiment 2

[0023] In this example, the total phosphorus in the raw water is 110ug / L, the soluble phosphorus is 89ug / L, the turbidity is 9.5NTU, and the COD Mn 5.6mg / L, under the condition of full stirring, add deep phosphorus removal coagulant to the raw water, the coagulant is composed of 2mg / L potassium permanganate and 6mg / L ferrous sulfate, after rapid stirring for 4min, add conventional coagulation Aluminum chloride 5mg / L, after conventional mixing, reaction, precipitation and filtration, COD Mn 1.5mg / L, effluent turbidity, total phosphorus and dissolved phosphorus were not detected, and other indicators also reached the standard of GB5749-1985.

Embodiment 3

[0027] In this embodiment, the turbidity of the raw water is 9.7NTU, the total phosphorus is about 60ug / L, the soluble phosphorus is 35ug / L, and the COD Mn 4.8mg / L, add deep phosphorus removal coagulant to the raw water under the condition of full stirring, the coagulant is composed of 2mg / L potassium permanganate and 6mg / L ferrous sulfate, after rapid stirring for 3min, add conventional coagulation Ferric chloride 4mg / L, after conventional mixing, reaction, precipitation and filtration, COD Mn 1.2mg / L, effluent turbidity, total phosphorus and dissolved phosphorus were not detected, and other indicators also reached the standard of GB5749-1985.

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Abstract

The invention discloses a coagulant aid to remove trace phosphor in the water in the environmental protective domain, which is characterized by the following: allocating the coagulant aid through potassium permanganate and ferrous sulfate according to equal quantity; setting the putting quantity of potassium permanganate at 2-6mg / L; stirring rapidly for 3-5 min; adding 20-40% normal coagulant aid; blending; reacting; sedimenting; filtering.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a coagulation-assisting new technology for urban water plant water supply treatment. Background technique [0002] Since Mlettinen of Finland pointed out that phosphorus can limit the growth of bacteria in drinking water in 1996, the research on the relationship between phosphorus and the biological stability of drinking water pipe network has been carried out rapidly. Studies have pointed out that for most drinking water, when the total phosphorus concentration is lower than 1 μg / l, phosphorus will become a limiting factor for the growth of microorganisms in water. Therefore, in the actual water treatment process, taking measures to reduce the phosphorus content in water as much as possible will greatly reduce the regeneration ability of bacteria in water and improve the biological stability of drinking water. [0003] However, extensive survey data also show...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/58C02F1/52
Inventor 杨艳玲李星彭永臻贾锋李圭白
Owner 北京精密单因子水工程技术有限公司
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