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Coagulation method for removing trace phosphorus in water

A technology for removing water and traces, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. Excellent decontamination performance

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

[0003] Conventional treatment has a certain effect on the removal of phosphorus in water. Some studies have shown that the removal rate of TP in raw water by conventional coagulation, sedimentation and filtration is 60-80%. When the total phosphorus content in raw water is about 80ug / L, conventional Advanced water treatment technology can basically reduce the total phosphorus content in water to 5ug / L, but this is still far from phosphorus becoming a limiting factor for microbial growth in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Taking the polluted river water of a certain city as the source water, the raw water COD Mn At 5.5mg / L, the turbidity is 5NTU, the total phosphorus (NP) is 480ug / L, and the soluble total phosphorus is 120ug / L. In the experiment, 1.0L of water sample was taken, and 12mg / L potassium permanganate and 36mg / L ferrous sulfate were added at the same time under rapid stirring. After mixing, reaction, precipitation and sand filtration, the water sample was taken for detection, COD Mn 2.5mg / L, turbidity, total phosphorus and dissolved phosphorus were not detected, and other indicators also reached the standard of GB5749-1985.

Embodiment 2

[0023] Using a park lake as the source water, raw water COD Mn At 18.6mg / L, turbidity 13.5NTU, total phosphorus (NP) 1256.5ug / L, soluble total phosphorus 875.8ug / L. In the experiment, 1.0L of water sample was taken, and 16mg / L potassium permanganate and 48mg / L ferrous sulfate were added at the same time under rapid stirring. After mixing, reaction, precipitation and sand filtration, the water sample was taken for detection, COD Mn 4.0mg / L, turbidity 1.5NTU, total phosphorus and dissolved phosphorus were not detected, and other indicators also reached the standard of GB5749-1985.

Embodiment 3

[0025] Take a well-protected Class II drinking water source as the experimental water sample, and the raw water COD Mn At 4.6mg / L, the turbidity is 8.2NTU, the total phosphorus (NP) is 60ug / L, and the soluble total phosphorus is 32ug / L. In the experiment, 1.0L of water sample was taken, and 8mg / L potassium permanganate and 24mg / L ferrous sulfate were added at the same time under rapid stirring. After mixing, reaction, precipitation and sand filtration, the water sample was taken for detection, COD Mn 1.8mg / L, turbidity 0.2NTU, 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 relates to a mixing and coagulating method to remove the trace phosphorous in water which belongs to environmental protection domain. The traditional water treating method can decrease the phosphorous content to about 5ug / L, but it is still far more than the content that the phosphorous becomes the growing restriction factor for the microbes in water. In the invention, adding 4-16mg / L kalium hypermanganicum and 12-48mg / L ferrous sulfate to the water at the same time, and then mixing, reacting, precipitating and sand-filtering. The invention has good de-pollution abilities, it can remove the turbid things and organic wastes through mixing and coagulating, while remove the phosphorous more thoroughly (lower than the threshold value) so as to improve the stability of organism in water and ensure the safe water supply; it needs no change of the previous water treatment procedures; it is simple, economical, and practical; it can change the dosage flexibly according to the untreated water quality and the volume of water to be treated to satisfy different requirements of different areas; it is broad-spectrum applicable.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a new coagulation technology for urban water plant water supply treatment. Background technique [0002] The influence of phosphorus content in the water supply network on the biological stability of water quality has been confirmed more and more. Studies have shown that phosphorus is a more reasonable limiting factor for the biological stability of the pipeline network than AOC. For most water quality, when the total phosphorus concentration When it 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, which is of great significance to ensure the safety of water s...

Claims

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Application Information

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