Waste water treatment method by postpositioning catalytic Fe internal electrolysis tank

A post-processing and catalytic iron technology, applied in the environmental field, can solve the problems of affecting the water treatment effect of the electrolysis process in the catalytic iron, hindering the electrolytic reaction of iron and copper, and aggravating the scaling on the surface of the iron filter material, so as to achieve enhanced water treatment Effect, avoid fouling phenomenon, improve the effect of removal rate

Inactive Publication Date: 2006-10-11
TONGJI UNIV
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Problems solved by technology

If the wastewater is alkaline, it will aggravate the scaling phenomenon on the surface of the iron filter material, which will seriously hinder the electrolysis reaction of iron and copper, thus affecting the water treatment effect of the catalytic iron electrolysis process

Method used

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  • Waste water treatment method by postpositioning catalytic Fe internal electrolysis tank
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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: process certain chemical industry waste water with the inventive method.

[0034] COD of a chemical wastewater Cr , BOD 5 , ammonia nitrogen NH 4 -N, suspended solid SS are 1000~1500mg / L, 200~300mg / L, 100~150mg / L, 100~150 respectively, pH is 9.5~10.0, chroma is 400-500. The specific steps are as follows:

[0035] (1) The wastewater is pretreated by the grid, and then mixed with the wastewater returned from the catalytic reduction tank and enters the A / O biochemical tank for biochemical reaction. The volume load of the A / O tank is 0.5kgBOD 5 / m 3 .d;

[0036] (2) The effluent in step (1) enters the settling tank for solid-liquid separation, the settling time is 0.5 hour, and part of the precipitate produced is returned to the biochemical tank, and the rest is discharged as excess sludge, and the reflux ratio is 50%;

[0037] (3) The effluent in step (2) enters the electrolytic cell in the catalytic iron again, and the reaction time of the electrolytic...

Embodiment 2

[0041] Embodiment 2: Process the mixed industrial waste water of certain industrial zone with the inventive method.

[0042] COD of wastewater Cr 、BOD 5 , SS are 500~800mg / L, 100~200mg / L, 200~300mg / L respectively, and the pH value is 6.5~8.0. It is processed by the method of the present invention. In order to reduce the occupied area, the biochemical pool adopts the SBR process in this process. Since the wastewater contains a large amount of colloidal suspended matter, a coagulation air flotation process is set up before the SBR tank, and the specific steps are as follows:

[0043] (1) The wastewater is pretreated by the grid, and then enters the coagulation air flotation tank. The coagulant is polyaluminum, and the dosage is 30mg / L. The effluent and the wastewater returned from the catalytic reduction tank are mixed into the SBR tank for biochemical reaction;

[0044] (2) The treated water obtained in the step (1) enters the settling tank, and the settling time is 1.0 hour...

Embodiment 3

[0049] Embodiment 3: process the dye wastewater discharged from a certain factory with the method of the present invention. The effluent is required to meet the nanotube discharge standard of the industrial park: COD Cr ≤300mg / l, SS≤80mg / l, chroma≤80.

[0050] COD of wastewater Cr , SS, respectively 2000~3000mg / L, 300~400mg / L, 200~300mg / L, pH value 5.5~7.5. It is processed by the method of the present invention. Due to the COD of wastewater Cr The content is very high. In this process, the biochemical pool adopts the filler A / O process. Specific steps are as follows:

[0051] (1) The waste water is pretreated by the grid, and then mixed with the waste water returned from the catalytic reduction tank and enters the A / O biochemical tank for biochemical reaction;

[0052] (2) The effluent in step (1) enters the settling tank for solid-liquid separation. The settling time is 2.0 hours, and part of the produced sediment is refluxed to the biochemical tank, and the rest is dis...

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Abstract

The invention belongs to an environment technical sphere, concretely relates to a postposition waste water disposal method of an atalytic iron electrolytic cell. When suspended solid of waste water SS>=100mg/L or pH values of waste water >=9.0, or both, during the process of biochemical pretreatment to waste water, setting the cell before the biochemical basin, making waste water pass through the biochemical basin, a sedimentation basin, the cell, coagulating sedimentation basin, making water quality of outlet water reach emission standard, using the invention to deal with waste water, scaling phenomena of iron filtering material in the cell are avoided totally, so that water treatment effet of electrolytic process in the cell is insured. It is effective that electrolytic process is taken as the pretreatment process of non-biodegradation and organic waste water in atalytic iron, and the invention makes the electrolytic process have more application area and pushes performance of a project.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to a method for post-processing wastewater in a catalytic iron internal electrolytic cell. Background technique [0002] In recent years, with the rapid development of printing and dyeing, dyeing, chemical, pharmaceutical, papermaking and other industries, the discharge of industrial wastewater is increasing, and the pollution to the environment is increasing. The characteristics of this kind of industrial wastewater are mainly ①complex composition and ②serious environmental pollution. Wastewater from the dye industry often contains toxic aromatic derivatives with sulfonic acid groups, nitro groups, amino groups, chlorine, etc.; wastewater from the chemical industry, such as coking wastewater, organic chemical wastewater, high ammonia nitrogen wastewater, and heavy metal wastewater, etc. Contains refractory organic pollutants and some toxic heavy metals, such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/70C02F1/461C02F1/52
Inventor 刘霞马鲁铭魏宏斌李少林
Owner TONGJI UNIV
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