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Leather industry chromium-containing wastewater recycling treatment process system

A leather industry and treatment process technology, applied in the field of chromium-containing wastewater resource treatment process system in the leather industry, can solve the problems that the water quality is difficult to meet the standard, and the secondary pollution of water, inorganic salts, and chrome sludge cannot be carried out, etc., and achieve resource utilization. Recycling, significant treatment effect, and effective equipment and material resolution

Inactive Publication Date: 2018-06-15
QUANZHOU NORMAL UNIV
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AI Technical Summary

Benefits of technology

This technology helps treat colored wastewaters by removing impurities from them while maintaining their purity for reuse or disposal purposes. It uses special types of filtrations that work well together without harmful substances like dyes being added. By doing this it allows us to recover clean waters more efficiently compared to previous methods which had trouble reaching certain levels due to contamination issues such as bacteria or heavy metals. Overall, these technical benefits make the treatment systems simpler, efficient, cost-effective, easier to manage, and environmentally friendly.

Problems solved by technology

This patented describes various methods used during the manufacturing processes of lignocellulosics (LC) products such as LC paper or wood pulp. These treatments involve reducing harmful substances from these materials while maintaining their beneficial properties. Existing techniques have limitations due to excessive energy usage and environmental concerns associated therewith. There exists a challenge towards effective and cost-effective disposal of chromide containing wastes generated during the processing stages described above.

Method used

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  • Leather industry chromium-containing wastewater recycling treatment process system

Examples

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Embodiment 1

[0024] The chromium-containing wastewater discharged from a leather tanning workshop in an enterprise has a Cr content of 30mg / L, a TDS of 3507mg / L, and a Ca content of 3507mg / L. 2+ The content is 24mg / L, Mg 2+ The content is 27mg / L, Cl - The content is 515mg / L, SO 4 2- The content is 1039mg / L, Na + The content is 712mg / L.

[0025] After the waste water containing chromium is removed by 0.5mm hydraulic sieve, it is separated into 5.0m 3 The / h flow rate enters the plate and frame filter press system for coarse filtration, the filtrate passes through the tubular ultrafiltration membrane for fine filtration, and the produced water enters the three-stage nanofiltration device, and the first-stage nanofiltration, second-stage nanofiltration and third-stage nanofiltration are recovered The ratios are 80%, 50%, and 50% respectively, and the final output of concentrated water in the nanofiltration system is 0.25m 3 / h, the Cr content is 595mg / L, and the fresh water output produ...

Embodiment 2

[0027] The chromium-containing wastewater discharged from a leather tanning workshop of an enterprise has a Cr content of 16mg / L, a TDS of 2715mg / L, and a Ca 2+ The content is 20mg / L, Mg 2+ The content is 46mg / L, Cl - The content is 760mg / L, SO 4 2- The content is 888mg / L, Na + The content is 785mg / L.

[0028] After the waste water containing chromium is removed by 0.5mm hydraulic sieve, it is separated into 5.0m 3 The / h flow rate enters the plate and frame filter press system for coarse filtration, the filtrate passes through the tubular ultrafiltration membrane for fine filtration, and the produced water enters the three-stage nanofiltration device, and the first-stage nanofiltration, second-stage nanofiltration and third-stage nanofiltration are recovered The ratios are 80%, 50%, and 50% respectively, and the final output of concentrated water in the nanofiltration system is 0.25m 3 / h, the Cr content is 317mg / L, and the fresh water output produced by the nanofiltrat...

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Abstract

The invention discloses a leather industry chromium-containing wastewater recycling treatment process system. The process system comprises a pretreatment system, a membrane separation system and a chromium recovery system which are sequentially communicated; the pretreatment system is used for the pretreatment of leather chromium-containing wastewater before membrane separation; the membrane separation system performs freshwater separation and chromium solution concentration treatment on the pretreated chromium-containing wastewater; and the chromium recovery system recycles chromium from a concentrated chromium solution obtained in the membrane separation system in order to obtain chromium powder with the chromium content being greater than 5%. The chromium-containing wastewater discharged from a leather tanning workshop is filtered and finely filtered by the pretreatment system, and then enters the membrane separation system composed of a nanofiltration device and an electrodialysisdevice to produce freshwater for direct reuse, obtained concentrated water undergoes electrodialysis desalination to prepare strong brine, and the remaining concentrated chromium solution enters the chromium recovery system and undergoes spray drying to obtain the chromium powder. The process system greatly saves precious water resources, and also realizes the recycling of chromium resources in order to achieve the recycling of the leather industry chromium-containing wastewater.

Description

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Claims

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Application Information

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Owner QUANZHOU NORMAL UNIV
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