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Leather making industrial salt recycling method and salt recycling system

An industrial salt and ultrafiltration system technology, applied in the field of tanning wastewater reuse, can solve problems such as difficulty in meeting clean production and environmental protection discharge requirements, unfavorable biochemical treatment of wastewater, etc. Effect

Pending Publication Date: 2018-09-28
杭州绿夏环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The total salt content of tannery comprehensive wastewater reaches 8.0×10 3 mg / L, high salt is not conducive to the biochemical treatment of wastewater, and it is increasingly difficult to meet the requirements of clean production and environmental protection discharge

Method used

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  • Leather making industrial salt recycling method and salt recycling system
  • Leather making industrial salt recycling method and salt recycling system
  • Leather making industrial salt recycling method and salt recycling system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] A salt recycling system for tanning industry, comprising sequentially connected wastewater collection tanks, demulsification-air flotation treatment system, ultrafiltration system and nanofiltration system.

[0092] The salt recycling method of the leather industry salt recycling system comprises the following steps:

[0093] The saline wastewater from the soaking section of tanning production is first collected into the wastewater collection tank, and then enters the demulsification-air flotation treatment system, ultrafiltration system and nanofiltration system in turn, and the effluent water obtained from the nanofiltration system enters the pickling section of tanning production , concentrated water enters the next step of processing equipment.

[0094] The salt content of the saline waste water in the waste water collection pond is 6% (wt%), the salt content of the treated water is 4.2% (wt%), and the salt content of concentrated water is 1.8% (wt%).

Embodiment 2

[0096] A salt recycling system for tanning industry, comprising a waste water collection tank, a grid tank, a demulsification-air flotation treatment system, an ultrafiltration system and a nanofiltration system connected in sequence.

[0097] The salt recycling method of the leather industry salt recycling system comprises the following steps:

[0098] The saline wastewater in the immersion section of tanning production is first collected into the wastewater collection tank, and then enters the grill tank, demulsification-air flotation treatment system, ultrafiltration system and nanofiltration system in sequence. The effluent water obtained from the nanofiltration system enters the tannery In the pickling section of production, the concentrated water enters the next processing equipment.

[0099] The salt content of the saline waste water in the waste water collection pond is 6% (wt%), the salt content of the treated water is 4.5% (wt%), and the salt content in the concentra...

Embodiment 3

[0101] A salt recycling system for tanning industry, comprising a waste water collection pond, a waste water regulating pond, a demulsification-air flotation treatment system, an ultrafiltration system and a nanofiltration system connected in sequence.

[0102] The salt recycling method of the leather industry salt recycling system comprises the following steps:

[0103] The saline wastewater in the immersion section of tanning production is first collected into the wastewater collection tank, and then enters the wastewater adjustment tank, demulsification-air flotation treatment system, ultrafiltration system and nanofiltration system in turn. The effluent water obtained from the nanofiltration system enters the tannery In the pickling section of production, the concentrated water enters the next processing equipment.

[0104] The salt content of the saline waste water in the waste water collection pond is 6.5% (wt%), the salt content of the treated water is 4.55% (wt%), and ...

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Abstract

The invention discloses a leather making industrial salt recycling method and a salt recycling system and relates to the technical field of leather making wastewater reutilization. The method includesfollowing steps: subjecting salt-containing wastewater of a leather making production water soaking section to ultrafiltration-nanofiltration double-membrane process treatment, recycling water produced after treatment for a leather making production acid pickling section, and further treating concentrated water. The system realizing the method comprises an ultrafiltration system and a nanofiltration system connected with the ultrafiltration system. The salt-containing wastewater of the leather making production water soaking section sequentially enters the ultrafiltration system and the nanofiltration system, water generated in outgoing water obtained by the nanofiltration system enters the leather making production acid pickling section, and the concentrated water enters next treatment equipment. By the method and the system, generated water after ultrafiltration and nanofiltration of high-salt-containing wastewater of the leather making production water soaking section can be recycled for the acid pickling process, so that salt adding of the acid pickling process is reduced or replaced, and salt content of leather making comprehensive wastewater is reduced greatly.

Description

technical field [0001] The invention relates to the technical field of reuse of tannery wastewater, in particular to a method for reusing salt in the tannery industry and a system for reusing salt. Background technique [0002] The tanning industry is a key industry in the national environmental protection management plan, and it is also an industry with high salt emissions. At present, the existing domestic wastewater treatment technology mainly focuses on the treatment of COD, Cr, SS and ammonia nitrogen. There is no targeted salt removal process in the tanning industry, and all the salt added in the tanning project is discharged with the wastewater. With the continuous improvement of the country's requirements for salt discharge and clean production in the tanning industry, the problem of salt discharge in the tanning industry will become a major problem that restricts the development and future survival of the industry and enterprises. [0003] The tanning process is di...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/04C02F103/24
CPCC02F1/442C02F1/444C02F9/00C02F1/24C02F2301/08C02F2103/24C02F1/52
Inventor 徐军富傅继达周良军
Owner 杭州绿夏环境科技有限公司
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