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Method capable of high efficiency removal of phosphorus in coating waste water

A high-efficiency technology for coating wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. Low cost and simple method

Inactive Publication Date: 2012-11-14
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art is to use alkalization and precipitation treatment of acidic coating wastewater, and the specific disadvantages are: in the prior art, the method of treating coating wastewater is mainly to alkalize the acidic coating wastewater by adding NaOH , and then add polyaluminum ferric chloride to the wastewater for a precipitation, and then add CaCl after filtration 2 Phosphorus removal from wastewater
Because the phosphorus content in coating wastewater ranges from 30mg / L to 300ml / L, and even reaches more than 300ml / L, the cost of treatment with this method is too high, and the water after treatment is unstable and cannot be discharged up to the standard, making the water eutrophic , causing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Treat 5L of painting wastewater, which contains 200ml / L of phosphorus in the initial detection.

[0020] (1) At 20°C, add CaCO to the coating wastewater with a pH of 4.5 3 , the pH is adjusted at 6.5, stop adding, after fully stirring, adding concentration is 5% polyaluminium ferric chloride (PAFC) 2.5g and concentration is 1% PAM 5g in described waste water, the precipitation filter that forms, waste water enters secondary precipitation;

[0021] (2) Add NaOH to the wastewater entering the secondary precipitation to adjust the pH until the pH is 11, then add 50g of CaCl to the secondary wastewater 2 , after fully stirring, add 5g of PAM, and filter after the reaction is complete.

[0022] It is measured that the phosphorus content of the treated water is less than 1ml / L, greater than 99.5%.

Embodiment 2

[0024] 10L of painting wastewater was treated, and the initial detection contained 380ml / L of phosphorus.

[0025] (1) At 30°C, add CaCO to the coating wastewater with a pH of 4.0 3 , the pH is adjusted at 8, stop adding, after fully stirring, adding concentration is 7% polyaluminium ferric chloride (PAFC) 25g and concentration is 2% PAM 15g in described waste water, the precipitation filter that forms, waste water enters two secondary precipitation;

[0026] (2) Add NaOH to the wastewater entering the secondary precipitation to adjust the pH until the pH is 12, then add 300g of CaCl to the secondary wastewater 2 , after fully stirring, add 15g of PAM, and filter after the reaction is complete.

[0027] It is measured that the phosphorus content of the treated water is less than 0.97ml / L, greater than 99.8%.

Embodiment 3

[0029] Treat 10L of painting wastewater, which contains 500ml / L of phosphorus in the initial detection.

[0030] (1) At 30°C, add CaCO to the coating wastewater with a pH of 4.0 3 , the pH is adjusted at 7.5, stop adding, after fully stirring, adding concentration is 10% polyaluminium ferric chloride (PAFC) 20g and concentration is 2% PAM 15g in described waste water, the precipitation filter that forms, waste water enters two secondary precipitation;

[0031] (2) Add NaOH to the wastewater entering the secondary precipitation to adjust the pH until the pH is 12, then add 250g of CaCl to the secondary wastewater 2 , after fully stirring, add 15g of PAM, and filter after the reaction is complete.

[0032] It is measured that the phosphorus content of the treated water is less than 2.5ml / L and greater than 99.5%.

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Abstract

The invention discloses a method capable of high efficiency removal of phosphorus in coating waste water. The method is characterized by being realized through the following steps: (1) adding CaCO3 into acidic coating waste water, adjusting a pH value of an obtained mixture to be 6.5 to 8, carrying out full stirring, then adding polymeric aluminum ferric chloride (PAFC) and a small amount of PAM into the waste water, filtering obtained deposit and subjecting the waste water to secondary deposition; and (2) adding NaOH into the waste water undergone secondary deposition so as to adjust the pH value until the pH value is no less than 11, then adding CaCl2 into secondary waste water, carrying out full stirring, then adding PAM, carrying out filtration after a reaction is completely finished and discharging the waste water. The method provided by the invention has a phosphorus removal rate of more than 90% and 99.5% in the two steps, respectively; reagents used in the method are economical, the method is simple, and waste water can stably reach discharge standard.

Description

technical field [0001] The invention relates to a method for treating phosphorus in painting wastewater, belongs to the technical field of chemical treatment of sewage, and in particular relates to a method capable of efficiently removing phosphorus in painting wastewater. Background technique [0002] The pollutants discharged from coating wastewater mainly include organic matter (chemical oxygen demand), pH, suspended matter and phosphate, etc. If they are discharged directly without treatment, the surrounding areas will be seriously polluted. [0003] The prior art is to use alkalization and precipitation treatment of acidic coating wastewater, and the specific disadvantages are: in the prior art, the method of treating coating wastewater is mainly to alkalize the acidic coating wastewater by adding NaOH , and then add polyaluminum ferric chloride to the wastewater for a precipitation, and then add CaCl after filtration 2 Phosphorus removal from wastewater. Because the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 夏志先刘婷婷
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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