Sludge pretreatment method based on sulfo-porphyrin iron catalyst Fenton-like system

A sulfonic porphyrin iron, catalyst technology, applied in water/sludge/sewage treatment, oxidation treatment of sludge, chemical instruments and methods, etc., can solve the problem of limited hydrolysis capacity of sludge, hydroxyl-substituted chloride ions and peroxide The problems of hindered hydrogen coordination and difficult high-valent iron oxide species can achieve the effect of improving subsequent resource utilization.

Active Publication Date: 2021-11-26
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

However, the traditional Fenton system used for sludge pretreatment has the following disadvantages: 1) The pH of sludge is usually around 7, and the iron and ferrous ions in the Fenton system need to maintain their ionic form in a strong acid environment, so in order to Ferric ions and ferrous ions will be quickly separated from the solution in the form of hydroxides. It is necessary to add a large amount of acidic reagents to control the pH of the Fenton reaction between 2-3, which greatly limits the use of the Fenton system. Application in sludge
2) The TS and VS of sludge are high, and the hydrolysis of extracellular polymers and microbial cell walls is difficult, which will cause the input hydrogen peroxide to be consumed by the sludge before contacting ferrous ions. Therefore, the hydrolysis of sludge by the existing Fenton system The capacity is very limited, which also leads to the application of the Fenton system to pretreat sludge requires a higher amount of hydrogen peroxide
3) The cycle of ferric ions and ferrous ions will be affected by the concentration of the two ions. The accumulation of ferric ions makes there not enough ferrous ions to activate

Method used

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  • Sludge pretreatment method based on sulfo-porphyrin iron catalyst Fenton-like system

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Embodiment 1

[0039] A kind of sludge pretreatment method based on sulfonic acid group porphyrin iron catalyst Fenton system, its process flow chart is as follows figure 1 shown, including the following steps:

[0040] S1. Prepare a sulfonic acid porphyrin iron catalyst (tetrakis(4-sulfonic acid phenyl) porphyrin ferric chloride, FeTSPPCl) into an aqueous solution with a concentration of 1 g / L, take 1 mL into the reactor, and pour to Add 0.36 mL of anhydrous methanol and 2.5 mL of hydrogen peroxide solution with a mass concentration of 30% into the reactor, and stir. Specifically, place the reactor in a shaker at 30°C for 3 hours to fully shake and react to obtain a mixed solution.

[0041] S2. Add 100 mL of activated sludge (TSS=40.39 g / L, pH=6.98) into the reactor containing the mixed solution in step S1 for hydrolysis treatment. Specifically, use a sealing film to bind the mouth of the reactor bottle, and at the same time put The reactor was incubated in a constant temperature shaking i...

Embodiment 2

[0070] A kind of sludge pretreatment method based on sulfonic acid porphyrin iron catalyst class Fenton system, comprises the following steps:

[0071] S1. Prepare the iron sulfonate porphyrin catalyst (tetrakis(4-sulfonate phenyl)porphyrin ferric chloride, FeTSPPCl) prepared in Example 1 into an aqueous solution with a concentration of 1 g / L, and take 0.1 mL , 2mL, 4mL, and 8mL were respectively placed in different reactors, and 0.36 mL of anhydrous methanol, 2.5 mL of hydrogen peroxide solution with a mass concentration of 30% were added to these reactors in turn, and stirred. Specifically, the reactor Placed in a shaker at 30°C for 3 h to fully shake the reaction to obtain a mixed solution.

[0072] S2. Add 100 mL of activated sludge (TSS=40.39 g / L, pH=6.98) into different reactors containing mixed liquid in step S1 (the corresponding concentrations of FeTSPPCl in these reactors are 0 mg / L, 10 mg / L, 20mg / L, 40mg / L, 80mg / L) for hydrolysis treatment, specifically, the bottl...

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Abstract

The invention discloses a sludge pretreatment method based on a sulfo-porphyrin iron catalyst Fenton-like system, which comprises the following steps: mixing a sulfo-porphyrin iron catalyst, methanol and a hydrogen peroxide solution, stirring, mixing the obtained mixed solution with sludge, and carrying out hydrolysis treatment to complete the pretreatment of the sludge. According to the sludge pretreatment method based on the sulfo-porphyrin iron catalyst Fenton-like system, the sulfo-porphyrin iron catalyst, methanol and the hydrogen peroxide solution are mixed and stirred to generate the mixed solution containing high-valence iron species, the mixed solution is further mixed with sludge, the sludge is effectively treated by utilizing the high-valence iron species, and the sludge treatment efficiency is improved. The method has the advantages of low catalyst and oxidant consumption, mild reaction conditions, high treatment efficiency, good treatment effect, good adaptability and the like, has very important significance for improving the subsequent resource utilization effect of the sludge, and is high in use value and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and relates to a sludge pretreatment method based on a sulfonic acid porphyrin iron catalyst Fenton-like system. Background technique [0002] The Fenton system is one of the typical advanced oxidation technologies that have been widely proven to promote sludge hydrolysis. In this system, ferrous ions activate hydrogen peroxide to generate hydroxyl radicals, and through this strong oxidizing free radicals and Electron exchange occurs in the extracellular polymer, thereby achieving rapid decomposition of the extracellular polymer. The oxidation potential of hydroxyl radicals is 2.7-2.8V, which is much higher than that of hydrogen peroxide (1.76 V), and it is the core substance for the Fenton system to promote sludge hydrolysis. The Fenton system is mainly divided into the following processes: 1) Ferrous ions react with hydrogen peroxide to generate hydroxyl radicals and iron ions; 2) Iro...

Claims

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Application Information

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IPC IPC(8): C02F11/06
CPCC02F11/06C02F2305/026
Inventor 阮敏孙宇桐黄兢黄忠良张燕茹吴子剑张巍陈宏吴希锴姚世蓉
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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