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Novel tannery wastewater treatment process

A technology of tannery wastewater and treatment process, which is applied in animal processing wastewater treatment, water/sewage treatment, flotation water/sewage treatment, etc. It can solve the problems of microbial inhibition, reduce toxicity, improve treatment effect, and improve air flotation efficiency effect

Pending Publication Date: 2021-01-22
张家港市杨舍丝印工艺厂
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AI Technical Summary

Problems solved by technology

Usually, the traditional tannery wastewater treatment technology is to collect and mix the wastewater from various processes and put them into the sewage treatment system together. However, because the wastewater contains a large amount of sulfide and chromium ions, it is very easy to inhibit microorganisms.

Method used

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  • Novel tannery wastewater treatment process
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Embodiment 1

[0031] Wastewater from a tanning factory:

[0032] The oil content in degreasing wastewater is 10g / L, COD Cr 18950mg / L; COD in dehydration and liming wastewater Cr 23500mg / L, sulfide ion 1500mg / L; Cr in chrome tanning wastewater 3+ 4000mg / L, COD Cr 10000mg / L.

[0033] A novel tannery wastewater treatment process comprises the steps of:

[0034] (1) Pretreatment: transport the depilatory liming wastewater and chrome tanning wastewater to the grid to remove impurities with a particle size of more than 1mm in the wastewater, and transport the mixed wastewater after the grid treatment to the coagulation tank; perform air flotation on the degreasing wastewater Treatment, the wastewater after air flotation is carried out grid treatment and then transported to the Fenton pool for advanced oxidation treatment. The volume ratio of the dehairing and liming wastewater to the chrome tanning wastewater is 3:1;

[0035] (2) Precipitation treatment: the effluent of the coagulation tank ...

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Abstract

The invention provides a novel tannery wastewater treatment process which comprises the steps that unhairing liming wastewater and chrome tanning wastewater are conveyed to a grid at the same time, and mixed wastewater treated by the grid is conveyed to a coagulating basin; carrying out air floatation treatment on degreased wastewater, carrying out grid treatment on the wastewater subjected to airfloatation, conveying the treated wastewater to a Fenton tank, carrying out advanced oxidation treatment, removing heavy metal ions in the wastewater, conveying the mixed wastewater to an MFC-iron-carbon coupling tank, carrying out degradation treatment, and finally, carrying out conventional biochemical treatment.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a novel process for treating tannery waste water. Background technique [0002] The tanning industry consumes a large amount of fresh water resources and discharges a large amount of tanning wastewater, which poses a serious threat to human health and the sustainable development of the entire society. The wastewater discharged by the tanning industry has problems such as high concentration of organic pollution, large amount of suspended matter, large water volume, and complex wastewater components, which contain toxic substances such as sulfur and chromium. [0003] In the tanning industry, animal skins are usually salted or soaked in water to make them swollen, then limed, fleshed, dealkalized, then tanned or chromed, tanned and fattened to soften, and finally dyed and processed to make leather. Tannery wastewater Usually SS 1500-1600mg / L, BOD700-3000mg / L. In t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30C02F103/24
CPCC02F9/00C02F1/001C02F1/52C02F1/24C02F1/725C02F1/722C02F1/4678C02F3/005C02F2101/30C02F2103/24Y02W10/10
Inventor 戴积法戴强王诚
Owner 张家港市杨舍丝印工艺厂
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