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Method for fenton photocatalytic oxidation degradation of various microcystins in water

A microcystin, catalytic oxidation technology, applied in the directions of oxidized water/sewage treatment, light water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of increasing the dosage of oxidant, reducing the oxidation efficiency and reaction time long and other issues

Inactive Publication Date: 2009-12-09
GUIZHOU ACAD OF ENVIRONMENTAL SCI & DESIGNING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the above studies, it can be seen that advanced oxidation technology can effectively remove algae toxins, but there are generally disadvantages such as long reaction time and large dosage of reagents.
This is because UV-TiO alone 2 , Fenton or UV-Fenton, etc. all have the disadvantages of low oxidant utilization rate or low light energy utilization rate, which leads to a longer time for oxidative degradation of algal toxins, and correspondingly increases the dosage of oxidant to achieve better removal effect, while This will inevitably lead to the oxidation of hydroxyl radicals to be removed by the oxidant, reducing the oxidation efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1. Be that 0.35mg / L, microcystin-LR concentration be 0.29mg / L in the deionized aqueous solution that microcystin-RR concentration is to add Fenton's reagent, in the Fenton's reagent that adds 2 o 2 The concentration is 0.1mmol / L, [H 2 o 2 ] / [FeSO 4 ] The molar ratio is 15 / 1; continue to add 0.05g / L photocatalyst TiO 2 ; Then use sulfuric acid and sodium hydroxide solution to accurately adjust the pH value of the mixture to 4.0; after fully stirring, place the above reaction solution at 1 cm under a 18-watt sterilizing ultraviolet lamp; react at an ambient temperature of 16±2°C for 3 minutes .

Embodiment 2

[0031] Example 2. Be that 0.35mg / L, microcystin-LR concentration be 0.29mg / L in the deionized aqueous solution that microcystin-RR concentration is to add Fenton's reagent, in the Fenton's reagent that adds 2 o 2 The concentration is 0.1mmol / L, [H 2 o 2 ] / [FeSO 4 ] The molar ratio is 5 / 1; continue to add 0.05g / L of TiO 2 ; Then use sulfuric acid and sodium hydroxide solution to accurately adjust the pH value of the mixed solution to 4.0; after fully stirring, place the above reaction solution at 1 cm under a 18-watt sterilizing ultraviolet lamp; react at an ambient temperature of 16±2°C for 2.5 min.

Embodiment 3

[0032] Example 3. Be that 0.35mg / L, microcystin-LR concentration be 0.29mg / L in the deionized aqueous solution that microcystin-RR concentration is to add Fenton's reagent, in the Fenton's reagent that adds 2 o 2 The concentration is 0.05mmol / L, [H 2 o 2 ] / [FeSO 4 ] molar ratio is 1 / 1, continue to add 0.005g / L photocatalyst TiO 2 ; Then use sulfuric acid and sodium hydroxide solution to adjust the pH of the mixture to 2.2; after fully stirring, place the above reaction solution at 1 cm under a 18-watt sterilizing ultraviolet lamp; react at an ambient temperature of 16±2°C for 5 minutes.

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PUM

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Abstract

The invention discloses a method for fenton photocatalytic oxidation degradation of various microcystins in water. The method comprises the following steps of: adding a fenton reagent and a photocatalyst in a water body polluted by the microcystins, adjusting the pH value of the mixed solution to 2.2 to 6.2 by sulfuric acid and solution of sodium hydroxide, fully stirring the mixed solution for reaction, and placing the reaction solution under an ultraviolet lamp for reaction for 0.5 to 5min. In the method, the degrading process of the microcystins is greatly shortened under the condition of reducing the adding amount of catalytic oxidation agent; moreover, the method has the characteristics of shortening reaction time, reducing adding amount of reagent, highly efficiently degrading various microcystins in the water body in a short time without causing secondary pollution, and meeting technical requirements of municipal water works and rural small-sized water purifying devices on degrading the microcystins in low cost and high efficiency.

Description

technical field [0001] The invention relates to a method for removing microcystins in water, in particular to a method for Fenton photocatalytic oxidation degradation of various microcystins in water. Background technique [0002] Microcystin is a hepatotoxin that is produced by cyanobacteria in eutrophic waters and has toxic effects on the human body. Microcystin-LR (MC-LR) and Microcystin-RR (MC-RR) are commonly found in water bodies. MC-LR has a strong tumor-promoting effect. In 2006, my country's newly promulgated and implemented "Drinking Water Sanitation Standard" (GB5749-2006) has clearly stipulated 1 μg / L as the limit value of MC-LR. Various countries in the world have carried out a large number of experimental studies on the removal of algae toxins using different methods, but these methods all have defects in varying degrees. As far as physical methods are concerned, conventional water treatment processes such as flocculation, precipitation, and filtration are no...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/32C02F1/66
Inventor 董泽琴张琳杨再荣张维
Owner GUIZHOU ACAD OF ENVIRONMENTAL SCI & DESIGNING
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