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Method for recovering synthetic-leather waste water

A technology for synthetic leather and waste water, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of poor biodegradability of waste water, etc. reduced effect

Inactive Publication Date: 2009-04-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biodegradability of the wastewater is extremely poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) First, use a stainless steel skeleton cotton thread with an effective filter pore size of 5μm to wind the filter element, filter pretreatment to remove fine suspended solids in the water, and protect the main reaction zone. The working pressure is 0.05 ~ 0.06MPa;

[0025] (2) Reuse catalyst for selective adsorption-catalytic reaction treatment, working temperature 80-85℃, flow rate 10m / hr, space velocity 3-3.5 / h;

[0026] (3) Finally, use the stainless steel skeleton cotton thread with an effective filtration pore size of 1 to 2 μm to wind the filter element for precision filtration, and then reuse it to the production line.

[0027] The carrier of the catalyst is medicinal activated carbon with an effective particle size of 1-2 mm and a specific surface area of ​​1100-1200 m 2 / g, the carrier volume is the same as the catalyst volume; the main active component of the catalyst is Ag-CeO 2 -Ce 2 O 3 , The main component of the additive is TiO2 , The dispersant is Al 2 O ...

Embodiment 2

[0031] The difference from Example 1 is that the working temperature is 90-95° C., the loading amount of silver is 0.02%, and the working pressure of filtration pretreatment is 0.2 MPa.

[0032] The implementation location of this example is in Yantai, Shandong.

Embodiment 3

[0034] The difference from Example 1 is that the space velocity is 6 / h.

[0035] The implementation location of this example is Jinjiang, Fujian.

[0036] Great economic benefits can be obtained by adopting the present invention:

[0037] According to the purchase of deionized water, the price exceeds 12 yuan / ton; the sewage fee exceeds 7 yuan / ton; the heating cost is about 14 yuan / ton (using coal-fired boilers). The synthetic leather wastewater is treated by the method, and the treatment cost per ton of water consumption catalyst is less than 25 grams, about 0.3-0.4 yuan; the cost of filter element consumption is about 0.15 yuan; and the electricity cost is about 0.2 yuan. In addition, tens of grams of solvent can be recovered per ton of water. The total benefit for each ton of water reused is about 30 yuan or more.

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Abstract

A method for recovering synthetic leather by selective adsorption-catalytic reacting technology is carried out by filter pre-treating at 0.05-0.2MPa, selective adsorption-catalytic reaction treating by catalyst and precision filter treating with effective pore-size 1-2um. The carrier of selective catalyst is medical active carbon grain with grain-size 1-2mm, the main active component is Ag-CeO2-Ce2O3, the main component of accessory ingredient is TiO2 and dispersing agent is Al2O3. It's cheap and convenient, has higher water recovery ratio, occupies less space and has no secondary-pollution.

Description

Technical field [0001] The invention relates to an industrial waste water treatment technology, in particular to a method for treating and recycling synthetic leather waste water from a work section by adopting selective adsorption-catalytic reaction technology. Background technique [0002] At present, some synthetic leather manufacturers need to use expensive distilled water in the extraction section during the production process. The produced wastewater contains a large amount of solvents, suspended solids, dyes, residual raw materials, lost auxiliary materials, synthesis side reaction products, impurities contained in raw materials and other pollutants, and the effluent temperature is as high as 80-95°C. The wastewater is extremely poor in biodegradability. [0003] In the existing method, after recovering about 70-80% of the heat energy through a large heat exchanger, the water temperature is reduced to about 30-40°C and sent to the sewage treatment plant for treatment. The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/42C02F9/04C02F9/02B01J23/00B01D61/14
Inventor 孙承林孙广路杨旭于永辉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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