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Harmless resource utilization method and device for tanning chromium-containing sludge

A technology of recycling chromium sludge, which is applied in the field of sludge recycling, can solve the problems of incomplete harmlessness and secondary pollution, and achieve the effect of efficient and harmless resource utilization and reasonable device structure design

Pending Publication Date: 2022-03-29
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a method for the harmless resource utilization of chromium-containing sludge in tannery and its device, the method mainly includes:

Method used

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  • Harmless resource utilization method and device for tanning chromium-containing sludge
  • Harmless resource utilization method and device for tanning chromium-containing sludge

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Experimental program
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Effect test

Embodiment 1

[0047] refer to figure 1 , to collect the chromium-containing sewage produced by the tannery. After testing, the main composition of the sewage is shown in Table 1.

[0048] Table 1 Composition of chromium-containing sewage

[0049] Sample source pH TOC [mg / L] Total chromium [mg / L] A Tannery 3.6 6784.3 48.76 B Tannery 3.4 8903.5 69.65

[0050] The chromium-containing sewage produced by tannery B was treated by reduction precipitation method, and the deposited chromium-containing sludge was collected. The first reduction precipitation method adopts ferrous sulfate solution (20wt%) and lime reagent (i.e. quicklime), wherein, the ferrous sulfate solution addition is 2-5% of the total weight of chromium-containing sewage, and the addition of quicklime is the total weight of chromium-containing sewage 1 to 3% of the chromium-containing sludge, no additional precipitation reagent is needed in the follow-up, and the adsorption material produced b...

Embodiment 2

[0069] A device for harmless resource utilization of chrome-containing sludge from tanning, such as figure 2 As shown, it includes dehydration device, drying device, pyrolysis device, combustion device, alkali-heat extraction device, solid-liquid separation device, granulation drying device, firing ceramsite device, modification device, oxidation treatment device, solid Liquid separation device I, dosing and precipitation device, solid-liquid separation device II, solid-liquid separation device III.

[0070] The sludge outlet of the dehydration device is connected to the inlet of the drying device, the sludge outlet of the drying device is connected to the inlet of the pyrolysis device, the outlet of the pyrolysis gas is connected to the inlet of the combustion device, and the high-temperature flue gas outlet of the combustion device is respectively connected to the pyrolysis device. The inlet of the heating interlayer of the device is connected with the inlet of the heating ...

Embodiment 3

[0081] A method for harmless resource utilization of chrome-containing sludge from tanning, comprising the following steps:

[0082] (1) Dewater the chrome-containing sludge from tannery, and then send it to the drying granulation system and pyrolysis carbonization system in turn; specifically, the dehydration treatment uses hydrothermal dehydration technology or high hydraulic mechanical dehydration to make the sludge hydrated The drying rate is less than or equal to 50%, and then dried and granulated, and the size after granulation is 0.5-10cm in diameter. The granules obtained by granulation were subjected to high-temperature pyrolysis at a temperature of 600° C. and a holding time of 1 h to obtain pyrolysis solid slag. At the same time, pyrolysis gas is produced during the pyrolysis process, mainly containing CO, CH 4 ,H 2 ,C 2 h 4 ,C 2 h 6 Wait.

[0083] (2) Pass the pyrolysis gas produced by the pyrolysis and carbonization system described in step (1) into the com...

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Abstract

The invention relates to a harmless resource utilization method and device for tannery chromium-containing sludge, and the method comprises the following steps: (1) carrying out dehydration treatment on the tannery chromium-containing sludge, and then sequentially feeding the tannery chromium-containing sludge into a drying granulation system and a pyrolysis carbonization system; (2) carrying out alkali heat extraction on pyrolysis solid residues generated by the pyrolysis carbonization system, then carrying out solid-liquid separation, and collecting a solid phase and a liquid phase; (3) drying the solid phase by using the high-temperature flue gas, and then preparing any one of an adsorption material and ceramic; carrying out oxidation treatment on the liquid phase, carrying out solid-liquid separation to obtain elemental sulfur, and carrying out dosing precipitation on the liquid phase to obtain a turbid liquid; and (4) carrying out solid-liquid separation on the turbid liquid to obtain a chromate precipitate, and carrying out adsorption treatment on a liquid phase to enter a chromium-containing sewage system. According to the method, comprehensive treatment of the chromium-containing sludge is realized, products with high additional values are produced, chromium pollution is reduced, and the method has relatively strong environmental protection advantages and economic benefits.

Description

technical field [0001] The invention relates to the technical field of sludge resource utilization, in particular to a method and device for harmless resource utilization of chromium-containing sludge from tanning. Background technique [0002] At present, more than 90% of the world's leather is tanned with chrome-containing chemicals. The most widely used tanning agent, basic chromium sulphate is used to transform the perishable collagen structure into a non-perishable leather matrix. Chromium ions form coordination bonds with the peptide bonds of the collagen structure of the skin, but usually only 50-60% of the chromium salts are used in the tanning process, and the rest is subsequently discharged into the sewer, resulting in high chromium levels in sewage treatment plants. Before entering the biological treatment system, chromium-containing wastewater needs to be purified by chemical precipitation techniques using lime and ferrous sulfate to remove dissolved chromium an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/121C02F11/10C02F11/13C10B53/00C02F1/28B01J2/00B01J20/02C01B17/02C04B33/132C04B38/06C09C1/00C02F103/24C02F101/22
CPCC02F11/121C02F11/10C02F11/13C10B53/00C02F1/281B01J2/00B01J20/02C01B17/02C04B33/1327C04B33/1328C04B38/009C09C1/0009C02F2103/24C02F2101/22C04B38/0645Y02P40/60Y02W10/40
Inventor 汪印李智伟林佳佳赖登国刘学蛟王兴栋潘蓓蓓
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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