Dyeing wastewater oxidation and degradation method based on long-lasting free radical activated persulfate

A technology for activating persulfate and dye wastewater, applied in chemical instruments and methods, oxidized water/sewage treatment, special compound water treatment, etc., can solve problems that have not been widely promoted, and achieve high decolorization rate, low cost, and abundance high effect

Inactive Publication Date: 2018-08-17
DONGHUA UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, although some advanced treatment of dye wastewater such as photochemistry, electrochemistry and advanced oxidation have achieved good results, due to the constraints of treatment costs, energy consumption and secondary pollution, these technologies have not yet been used in the advanced treatment of dye wastewater. Widely promoted
In addition, in order to seek technical methods that can efficiently remove refractory substances and nutrients such as nitrogen and phosphorus in dye wastewater, relevant scholars and engineers at home and abroad have also developed some new technologies and processes, such as free radical oxidation technology. Sulfate activation methods to generate sulfate radicals mainly include thermal activation, ferrous salt activation, benzoquinone activation, etc., but the use of persistent free radicals to activate persulfate to generate sulfate radicals has been applied to the advanced treatment of industrial wastewater. very few reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Air-dry the biological sludge, crush it into 2mm particles, take 5g and put it into a 100mL stainless steel reaction kettle, add 20mL deionized water, seal it, control the magnetic stirring rate to 600r / min, and then heat it to 200°C for 1h , after the reaction, the reaction kettle was naturally cooled to room temperature, poured out the solid-liquid mixture obtained by the reaction in a beaker, rinsed with 20mL of hydrochloric acid with a concentration of 0.1mol / L, soaked with 20mL of ethanol with a volume fraction of 85%, and then used 40mL of deionized rinse, vacuum filtration, and finally weighed to obtain 2.6g of sludge-based activated coke.

[0023] Weigh 20 mg of the above-mentioned sludge-based active coke and disperse it into reactive blue dye wastewater. The chromaticity of the wastewater is 800 times, the concentration of total organic carbon is 10 mg / L, and the pH value is adjusted to 6.8. Shake for 30 minutes, control the shaking frequency to 100r / min, sepa...

Embodiment 2

[0025] Air-dry the biological sludge, crush it into 4mm particles, take 5g and put it into a stainless steel reactor with a volume of 100mL, add 10mL of deionized water, seal it, control the magnetic stirring rate to 800r / min, and then heat it to 260°C for 4h , after the reaction, the reaction kettle was naturally cooled to room temperature, poured out the solid-liquid mixture obtained by the reaction in a beaker, rinsed with 10 mL of hydrochloric acid with a concentration of 0.1 mol / L, soaked with 10 mL of acetone with a volume fraction of 50%, and then used 20mL of deionized rinse, vacuum filtration, and finally weighed to obtain 2.0g of sludge-based activated coke.

[0026] Weigh 50 mg of the sludge-based activated coke obtained above and disperse it into the acid red dye wastewater, the chroma is 1200 times, the total organic carbon concentration is 15 mg / L, adjust the pH value to 7.6, then quickly add 150 mg of sodium persulfate, shake at room temperature 90min, control t...

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Abstract

The invention provides a dyeing wastewater oxidation and degradation method based on long-lasting free radical activated persulfate. The method comprises following steps: drying biological sludge in air, grinding biological sludge into biological sludge particles; putting biological sludge particles into a stainless steel reactor, adding deionized water, sealing the reactor, carrying out magneticstirring, heating, carrying out reactions; after reactions, cooling, washing, performing vacuum filtering to obtain sludge based active coke; dispersing sludge based active coke into dyeing wastewater, adjusting the pH to 6.8-7.6, adding persulfate, performing vibration at a room temperature, after reactions, carrying out solid-liquid separation, allowing the supernate to stand still for a while,and then measuring the absorbance and total organic carbon content. The technological process is simple, the secondary pollution is small, the discoloring rate is high, the cost is low, and the energyconsumption is low. Long-lasting free radical activated persulfate on the surface of sludge based active coke is used to generate sulfate free radicals, hydroxyl free radicals and singlet oxygen witha strong oxidative performance, the sulfate free radicals, hydroxyl free radicals and singlet oxygen can rapidly degrade dye molecules, and thus the method has a wide application prospect in engineering.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a method for oxidatively degrading dye wastewater based on persistent free radical activation of persulfate. Background technique [0002] Dye wastewater has the characteristics of large water volume, high concentration of chroma and organic matter, large changes in water quality and pH, and complex components. In addition, the wastewater also contains residual dyes, sizing agents, auxiliaries, fiber impurities, and inorganic salts, etc., which are relatively biochemical. Poor industrial wastewater. At this stage, the shortage of water resources and the discharge of pollutants have become the restrictive factors for the sustainable development of the printing and dyeing industry. In order to meet the increasingly stringent discharge standards and comprehensive reuse standards of dye wastewater, the traditional wastewater treatment process must be upgraded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/30
CPCC02F1/66C02F1/72C02F9/00C02F2001/007C02F2101/308C02F2305/023
Inventor 高品薛罡钱雅洁金雅雯刘保江刘振鸿李响陈红
Owner DONGHUA UNIV
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