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Method for separating chromiumin leather-making waste water by milked liquid and membrane separating method

A technology of emulsion liquid membrane and tannery wastewater, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems that the actual application effect is not as good as the demonstration project, the difficulty of treatment, and the impact on the quality of treatment

Inactive Publication Date: 2005-05-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on this, the China National Light Industry Association, the Leather Industry Association, scientific research institutions and colleges and universities screened, improved and perfected my country's tannery wastewater treatment technology, and successfully promoted the direct recycling technology of chromium-containing wastewater, oxidation Ditch and jet aeration are practical and comprehensive treatment technologies, as well as cleaning processes such as hair preservation and depilation, and water-saving technologies. However, due to differences in local conditions and environmental protection requirements, factors such as the technical level of design and construction units and equipment suppliers, etc. The actual application effect is not as good as the demonstration project
At the same time, the particularity of the water quality of tannery wastewater also determines the difficulty of its treatment, and a little carelessness will affect the quality of treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Embodiment 1: first surfactant Span80 (sorbitan monooleate), mobile carrier TOA (trioctylamine) and kerosene are mixed in a volume ratio of 1: 2: 97, and the mixture is mixed with a mass of 3: 2 Add the NaOH solution with a concentration of 0.05mol / L, and stir evenly at a speed of 3000 rpm to obtain a stable white emulsion; mix the emulsion with the K to be treated 2 Cr 2 o 7 The solution is mixed according to the volume ratio of 1:15, stirred at a low speed of 200 rpm, so that the chromium is fully extracted; after a period of mass transfer, the emulsion is transferred to a separatory funnel to stand for stratification, and the colorless water phase of the lower layer is removed. Measure the content of chromium, monitor and discharge after reaching the standard. The oil layer is an emulsion of oil phase and internal water phase, and the water phase after demulsification by microwave technology is chromium salt.

Embodiment 2

[0007] Embodiment 2: first surfactant Span80 (sorbitan monooleate), mobile carrier TOA (trioctylamine) and kerosene are mixed in a volume ratio of 2: 4: 94, and the quality of the mixture is 2.5: 2 Add the NaOH solution with a concentration of 0.1mol / L, and stir evenly at a speed of 2800 rpm to obtain a stable white emulsion; mix the emulsion with the K to be treated 2 Cr 2 o 7 The solution is mixed according to the volume ratio of 1:12, stirred at a low speed of 300 rpm, so that the chromium is fully extracted; after a period of mass transfer of the emulsion, it is transferred to a separatory funnel to stand for stratification, and the colorless water phase of the lower layer is removed. Measure the content of chromium, monitor and discharge after reaching the standard. The oil layer is an emulsion of oil phase and internal water phase, and the water phase after demulsification by microwave technology is chromium salt.

Embodiment 3

[0008] Embodiment 3: first surfactant Span80 (sorbitan monooleate), mobile carrier TOA (trioctylamine) and kerosene are mixed in a volume ratio of 3: 6: 91, and the mixture is mixed with a quality of 3.5: 2 Add the NaOH solution with a concentration of 0.2mol / L, and stir evenly at a speed of 2500 rpm to obtain a stable white emulsion; mix the emulsion with the K to be treated 2 Cr 2 o 7 The solution is mixed at a volume ratio of 1:18, stirred at a low speed of 270 rpm, so that the chromium is fully extracted; after a period of mass transfer of the emulsion, it is transferred to a separatory funnel to stand for stratification, and the colorless water phase of the lower layer is removed. Measure the content of chromium, monitor and discharge after reaching the standard. The oil layer is an emulsion of oil phase and internal water phase, and the water phase after demulsification by microwave technology is chromium salt.

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Abstract

A process for separating Cr from the tanning sewage by emulsion membrane method includes such steps as proportionally mixing Span 80, flowing carrier TOA and kerosene, adding the mixture to NaOH solution, high-speed stirring to obtain emulsion, proportionally mixing it with K2Cr2O7 solution to be treated, low-speed stirring, laying aside for layering, discharging the lower layer of colorless water phase, and high-voltage electrostatic or microwave demulsifying to obtain Cr salt in the form of water phase.

Description

technical field [0001] The invention relates to a treatment technology for chrome tanning waste liquid, in particular to an emulsion liquid membrane method for separating and enriching Cr in tanning waste water. Background technique [0002] At present, the treatment technologies for chrome tanning waste liquid include recycling technology and recycling technology. Among them, recycling technologies include direct circulation and closed circulation, which all belong to the category of clean technology. Recycling technology can be divided into: ion exchange method, alkali precipitation method, extraction method, adsorption method and liquid membrane method. Among them, the cost of adsorbents such as activated carbon used in the adsorption method is expensive, which limits the large-scale application of this method. The ion exchange method requires a lot of pretreatment work before entering the ion exchange column due to the complex components of the waste chromium solution....

Claims

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Application Information

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IPC IPC(8): B01D61/40C02F1/62
Inventor 景亚卓赵串串张哲王敏
Owner SHAANXI UNIV OF SCI & TECH
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