System and method for removing heavy metal chromium, dyes and short wool fibers in leather wastewater

A technology for leather wastewater and heavy metals, which is applied in chemical instruments and methods, water pollutants, animal processing wastewater treatment, etc. Effect

Active Publication Date: 2020-07-17
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the treatment of heavy metal chromium pollutants and dyes in the existing leather wastewater is difficult to meet the national, industry and local heavy metal discharge and chromaticity standards, and

Method used

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  • System and method for removing heavy metal chromium, dyes and short wool fibers in leather wastewater
  • System and method for removing heavy metal chromium, dyes and short wool fibers in leather wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] 1. Material properties

[0056] (1) Leather wastewater containing heavy metals, dyes, and short-haired fibers: The tanning and dyeing wastewater of a tannery has a solid particle content of 600 mg / L and a heavy metal ion chromium concentration of 120 mg / L, both exceeding the standard. The waste water treatment capacity of the side line experiment is 40L / h at room temperature.

[0057] (2) Separation and adsorption medium: The granular bed separator group uses modified carbon ball particles as the separation medium; the dual-function adsorption tower uses D001 resin pellets as the adsorbent.

[0058] 2. Process flow

[0059] In view of the high content of dyes, short-haired fibers and heavy metals in leather wastewater, choose the following figure 1system shown. The waste water first passes through the particle bed separator to remove short-haired fibers and some dyes in the water; the waste water treated by the self-cleaning particle bed is placed in a liquid storage...

Embodiment 2

[0066] 1Material properties

[0067] (1) Wastewater containing heavy metal chromium, dyes, and short-haired fibers: The wastewater discharged from a leather factory has a solid particle content of 430mg / L and a heavy metal ion chromium concentration of 105.6mg / L, exceeding the standard. The waste water treatment capacity of the side line experiment is 80L / h at room temperature.

[0068] (2) Separation and adsorption medium: The particle bed separator group uses modified coal particles as the separation medium; the dual-function adsorption tower uses D401 porous resin pellets.

[0069] 2. Process flow

[0070] In view of the characteristics that leather wastewater contains more heavy metals, dyes and fibers, choose as attached figure 1 Process flow shown. The leather wastewater first passes through the particle bed separator to remove short-haired fibers and other impurity solid particles in the wastewater; then add Fenton’s reagent and other decolorizers to decompose the dy...

Embodiment 3

[0077] 1Material properties

[0078] (1) Wastewater containing heavy metal chromium and dyes: The wastewater discharged from a tannery has a solid particle content of 8.9mg / L, a heavy metal ion chromium concentration of 146.2mg / L, and a chroma of 3300. Both heavy metals and chroma exceed the standard. The waste water treatment capacity of the side line experiment is 40L / h at room temperature.

[0079] (2) Adsorption medium: The dual-function adsorption tower uses 732-type porous resin pellets.

[0080] 2 process flow

[0081] In view of the characteristics of leather wastewater containing heavy metals and more dyes, choose the following figure 1 Process flow shown. First add an appropriate amount of ozone decolorizer to the leather wastewater, stir until fully mixed and then let it stand for 30 minutes, then the supernatant is pressurized by the pump to the deep interception filter tower to remove the solid particles produced by the decolorization reaction, and finally use ...

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Abstract

The invention relates to an advanced treatment system and method for leather wastewater containing heavy metals, dyes and short wool fibers. The method comprises the following steps: firstly, deeply removing the short wool fibers and other impurity solid particles in the leather wastewater by using a particle bed separator; then adding a decolorizing agent to decompose dye molecules in the wastewater; then, removing solid particles generated by a decoloration reaction by using a deep interception filtering tower; and finally, carrying out in-depth removal of heavy metal chromium ions, dye molecules and fragments thereof in the wastewater by using a dual-functional adsorption tower so as to allow effluent to meet reuse requirements or related discharge standards and greatly reduce the discharge amount of chromium-containing hazardous wastes. The treatment method and system can realize synchronous deep removal of heavy metals, dyes and fibers in wastewater produced in the industries of leather, textile, printing and dyeing, papermaking and the like, effluent quality meets reuse requirements, and the effluent reaches relevant national and local discharge standards in China.

Description

technical field [0001] The invention belongs to the field of waste water treatment in environmental protection, relates to a treatment process system for heavy metals, dyes and fibers in waste water, and is suitable for synchronous deep removal of heavy metals, dyes and fibers in waste water in industries such as leather, textiles, printing and dyeing, and papermaking, especially heavy metals Deep removal of chrome contaminants, dye contaminants and short-haired fibers. Specifically, a treatment process and system for synchronously deep removal of heavy metal chromium, dyes and short-haired fibers in leather wastewater are provided. Background technique [0002] my country is a big country in the leather industry, which is a high water consumption and heavy pollution industry. Therefore, the leather industry is currently facing serious resource and ecological environment constraints. A large number of chemical raw materials used in the production process of tannery wastewat...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/22C02F101/30C02F103/24
CPCC02F9/00C02F1/001C02F1/72C02F1/78C02F1/28C02F11/122C02F2101/22C02F2101/308C02F2103/24C02F2301/08C02F2303/16C02F2305/026
Inventor 胡军吕文杰赵开庆马世浩孔令凯
Owner EAST CHINA UNIV OF SCI & TECH
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