A treatment method for fluorescence penetrant detection wastewater

A fluorescent penetration and treatment method technology, applied in the field of wastewater treatment, can solve problems such as complex components and environmental pollution, and achieve good adsorption effects, avoid organic pollution, and good mud-water separation effects

Inactive Publication Date: 2016-03-23
湖南中车环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface treatment before fluorescent penetrant testing requires a large amount of testing reagents, and a large amount of high-concentration fluorescent penetrant testing wastewater will be produced during the cleaning of parts after testing. The main components include fluorescent agents, surfactants, mineral oil and Various chemical additives, the composition is very complex
Generally speaking, the COD concentration of fluorescence penetrant detection wastewater reaches 700mg / L-8000mg / L, and the oil concentration reaches 300mg / L-700mg / L. If it is not treated in time, it will cause great pollution to the environment.

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0020] A specific embodiment of a treatment method for fluorescent penetrant detection wastewater, comprising the following steps:

[0021] (1) Coagulation and demulsification precipitation: Take a certain amount of fluorescent penetrant detection wastewater, adjust the pH value of the wastewater to 8-9 with lime, and add coagulant Fe-modified bentonite to it, and the dosage is 1-5g / L, stirred for 1 min, precipitated for 30 min, and took the middle clear liquid.

[0022] (2) Fenton oxidation: add sulfuric acid to the middle clear liquid, adjust the pH to 3-4, and then add FeSO 4 ·7H 2 O and H 2 o 2 , FeSO 4 ·7H 2 The dosage of iron element in O is 40~80mg / L (relative to the volume of wastewater), iron element and H 2 o 2 The mass ratio is 1:10~35, and the reaction is stirred for 5h.

[0023] (3) Adsorption coagulation precipitation: After Fenton reaction, add 2-8g / L powdered activated carbon to the mixture, stir for 15-45 minutes; adjust the pH value of the mixture to...

Embodiment 1

[0027] (1) Coagulation and demulsification precipitation: Take 1L of fluorescent penetrant detection wastewater raw water in a beaker, the raw water COD is 2025mg / L, the oil concentration is 350mg / L, adjust the pH value of the wastewater to 8-9 with lime, and add mixed Coagulant Fe-modified bentonite, the dosage is 2g / L, stirring for 1min, settling for 30min, taking the middle clear liquid, the clear liquid COD drops to 474mg / L, and the oil concentration drops to 43mg / L.

[0028] (2) Fenton oxidation: add sulfuric acid to the middle clear liquid, adjust the pH to 3.5, and then add FeSO 4 ·7H 2 O0.3g, H 2 o 2 (Mass fraction 30%) 4mL, stirring reaction for 5h, COD decreased to 260mg / L after Fenton reaction, oil concentration decreased to 5.2mg / L.

[0029] (3) Adsorption coagulation and sedimentation: After Fenton reaction, add powdered activated carbon to the mixed liquid at an dosage of 3g / L, stir and react for 15 minutes; adjust the pH value of the mixed liquid to 8-9 with ...

Embodiment 2

[0031] (1) Coagulation and demulsification precipitation: Take 1L of fluorescent penetrant detection wastewater raw water in a beaker, the raw water COD is 5540mg / L, the oil concentration is 470mg / L, adjust the pH value of the wastewater to 8-9 with lime, and add mixed Coagulant Fe-modified bentonite, the dosage is 3g / L, stirring for 1min, and sedimentation for 30min. Take the middle clear liquid, the clear liquid COD drops to 2200mg / L, and the oil concentration drops to 67mg / L.

[0032] (2) Fenton oxidation: Add sulfuric acid to the middle clear liquid, adjust the pH to 3.5, and add FeSO 4 ·7H 2 O0.35g, H 2 o 2 (Mass fraction 30%) 7mL, stirring reaction for 5h, COD decreased to 910mg / L after Fenton reaction, oil concentration decreased to 7.6mg / L.

[0033] (3) Adsorption coagulation and precipitation: After Fenton reaction, add 6g / L powdered activated carbon to the mixed solution and stir for 15 minutes; adjust the pH of the mixed solution to 8-9 with lime, add coagulant ...

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Abstract

The invention provides a treatment method for fluorescence penetrating detection wastewater, the specific steps include Fe-modified bentonite coagulation and demulsification precipitation; Fenton oxidation, adsorption, coagulation precipitation and filter bag filtration; if the concentration of raw water pollutants is greater than 1000mg / L When the filter bag is filtered, the filtrate can enter the PP cotton security filter, and then enter the reverse osmosis membrane for filtration, which can maintain stable and excellent effluent quality. Fluorescent wastewater treated by this method can meet the first-class standard of GB8978-96 and be discharged directly, and the COD is less than 100? mg / L.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method for fluorescence penetrant detection wastewater. Background technique [0002] Fluorescence penetrant testing is widely used in aviation, aerospace, special equipment and other industrial fields, and it is mainly used in non-destructive testing of precision parts. However, the surface treatment before fluorescent penetrant testing requires a large amount of testing reagents, and a large amount of high-concentration fluorescent penetrant testing wastewater will be produced during the cleaning of parts after testing. The main components include fluorescent agents, surfactants, mineral oil and Various chemical additives, the composition is very complex. Generally speaking, the COD concentration of fluorescence penetrant detection wastewater reaches 700mg / L-8000mg / L, and the oil concentration reaches 300mg / L-700mg / L. If it is not treated in time, it will cause ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 周杉凌偲李典
Owner 湖南中车环境工程有限公司
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