Method for improving iron-carbon micro-electrolysis reaction efficiency by utilizing iron-containing waste acid solution wastewater

A technology of iron-carbon micro-electrolysis and reaction efficiency, which is applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, and textile industry wastewater treatment, etc. problem, to prevent passivation, enhance the treatment effect, and inhibit the effect of oxidation

Inactive Publication Date: 2020-08-11
NANJING UNIV +1
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Problems solved by technology

[0009] Aiming at the problem that the method of improving the efficiency of iron-carbon micro-electrolysis reaction in the prior art has the problems of complicated device system transformation and high cost, and at the same time, the problem of low recycling degree of iron-containing waste acid solution, the present invention provides a method for utilizing iron-containing waste A method for effectively improving the reaction efficiency of iron-carbon micro-electrolysis by acid solution, using the acidic system in the iron-containing waste acid solution to adjust the pH environment of the iron-carbon micro-electrolysis reaction system, on the other hand, using a large amount of Fe in the acid solution 2+ It has the function of electron transfer, inhibits the oxidation of the iron surface as a filler, prevents the formation of a dense oxide layer on the iron-carbon filler, and prevents passivation, thereby improving the reaction efficiency of iron-carbon micro-electrolysis

Method used

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  • Method for improving iron-carbon micro-electrolysis reaction efficiency by utilizing iron-containing waste acid solution wastewater
  • Method for improving iron-carbon micro-electrolysis reaction efficiency by utilizing iron-containing waste acid solution wastewater
  • Method for improving iron-carbon micro-electrolysis reaction efficiency by utilizing iron-containing waste acid solution wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In this embodiment, the iron-carbon micro-electrolysis unit is mainly used to reduce nitrobenzene in wastewater. The wastewater comes from the red and yellow mixed wastewater in the nitrobenzene (TDI) production wastewater. The wastewater is strongly acidic and contains a large amount of nitrobenzene. Because nitrobenzene has a high redox potential, it will have a greater impact on anaerobic treatment. influences. Therefore, iron-carbon micro-electrolysis is generally used to reduce nitrobenzene in wastewater to aniline, and the reduced wastewater is biologically treated by anaerobic / hydrolytic acidification process to reduce the cost of wastewater treatment.

[0031]In this example, the red-yellow mixed wastewater in the TDI production wastewater was taken as the research object, and the nitrobenzene in the wastewater was reduced by iron-carbon micro-electrolysis. During the experiment, the continuous flow experiment was mainly carried out. The iron-carbon micro-elect...

Embodiment 2

[0051] In this example, the wastewater from the pharmaceutical industry is taken as the research object. The organic matter in the wastewater is relatively high, and it is difficult to degrade the organic matter. It is necessary to carry out iron-carbon micro-electrolysis + Fenton coupling process to pretreat the wastewater. The raw water quality indicators of medical wastewater are shown in Table 2.

[0052] Table 2 Raw water indicators of medical wastewater

[0053]

[0054] It can be seen from the data in Table 2 that the pH of the raw water is 2.44, which is within the suitable pH range for iron-carbon micro-electrolysis, so the iron-containing waste acid solution was directly added in the experiment. The experimental process is as follows:

[0055] (1) Add iron-containing waste acid: Take 1L of waste water sample in a beaker, add 5ml of iron-containing waste acid solution, the iron-containing waste acid solution comes from pickling waste solution in the electroplating...

Embodiment 3

[0072] In this example, the wastewater from the printing and dyeing industry is taken as the research object. The wastewater has high chroma, high concentration of refractory organic matter, and poor biodegradability. Therefore, the main purpose of the study in this example is to use iron-carbon micro-electrolysis to remove the chroma of wastewater while improving the B / C of wastewater. The raw water quality indicators are shown in Table 4.

[0073] Table 4 Raw water indicators of printing and dyeing wastewater

[0074]

[0075] It can be seen from the data in Table 4 that the pH value of the raw water is 6.54, and the pH value can be directly adjusted by the iron-containing waste acid solution. The waste water has low B / C, poor biochemical properties, and the color is dark red.

[0076] The experimental process is as follows:

[0077] (1) Adjusting pH: Take 1L of wastewater water sample in a beaker, adjust the pH value of wastewater to 3.13 by using iron-containing wast...

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Abstract

The invention provides a method for improving iron-carbon micro-electrolysis reaction efficiency by utilizing iron-containing waste acid solution wastewater, and belongs to the field of wastewater treatment and waste acid recycling. According to the method, in the process of removing refractory organic matters in the wastewater by using an iron-carbon micro-electrolysis reaction, before the iron-carbon micro-electrolysis reaction, Fe<2+>-containing waste acid solution wastewater is added in the reaction, and the iron-containing waste acid solution wastewater also contains precious metal elements. According to the method disclosed by the invention, the pH environment of an iron-carbon micro-electrolysis reaction system is adjusted by utilizing an acid system in the iron-containing waste acid solution, and the electron transfer effect of a large amount of Fe<2+> in the acid solution is utilized to inhibit the oxidation of the surface of the iron elementary substance serving as the filler, prevent the formation of a compact oxide layer on the iron-carbon filler and prevent passivation, and therefore, the reaction efficiency of iron-carbon micro-electrolysis is improved; and meanwhile,the activation energy of organic matter chain scission is remarkably reduced under the catalytic action of precious metal, and the reaction efficiency of iron-carbon micro-electrolysis is remarkablyimproved.

Description

technical field [0001] The invention relates to a method for treating refractory organic matter in waste water by using iron-containing waste acid liquid, and belongs to the field of waste water treatment and waste acid recycling. Background technique [0002] Wastewater produced in petrochemical, industrial metallurgy, electroplating, papermaking, pharmaceutical and other industries has complex components, poor biodegradability, and high toxicity. It needs pretreatment before further biochemical treatment. Because of its simple process, convenient operation and high pretreatment effect, iron-carbon micro-electrolysis technology is often coupled with Fenton oxidation technology as a pretreatment measure for refractory wastewater. Iron-carbon micro-electrolysis is to use iron-carbon filler iron filings and carbon particles to form countless tiny primary batteries, forming an electric field in its action space, and the new ecological [H], Fe 2+ Such as redox reaction with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F9/06C02F9/14C02F101/20C02F101/30C02F101/38C02F103/16C02F103/30C02F103/34C02F103/36
CPCC02F1/461C02F1/52C02F1/66C02F1/722C02F1/725C02F3/02C02F3/28C02F3/30C02F9/00C02F2001/007C02F2101/20C02F2101/203C02F2101/30C02F2101/38C02F2103/16C02F2103/30C02F2103/343C02F2103/36C02F2103/365
Inventor 张炜铭高亚娟单超汪林唐凯
Owner NANJING UNIV
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