Purification treatment method of raw hide pre-soaking liquid waste

A purification treatment and presoaking technology, which is applied in water/sewage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve problems such as sodium chloride pollution, achieve less impurity content, occupy a small area, reduce Effect of Chloride Content

Inactive Publication Date: 2019-04-26
JIAXING UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art, to propose a method for purifying rawhide pre-soaked waste water, to solve the pollution problem caused by high-concentration sodium chloride in the waste liquid, and to reuse the treated aqueous solution , with the characteristics of efficient processing and obvious effect

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  • Purification treatment method of raw hide pre-soaking liquid waste
  • Purification treatment method of raw hide pre-soaking liquid waste

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Experimental program
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Effect test

Embodiment 1

[0029] refer to figure 1 Purification treatment of raw hide pre-soaking water wastewater in cowhide tannery:

[0030] Step S1. Filtration of immersion waste liquid: filter the immersion waste liquid discharged from the drum by using a rotary mechanical grid with a rake tooth gap of 1 mm, and then collect the waste liquid in the coagulation tank;

[0031] Step S2. Coagulation reaction: Add the pre-dissolved polyaluminum chloride (PAC), nonionic polyacrylamide (PAM) and cationic polyacrylamide (CPAM) into the coagulation tank successively to make the mixture The concentrations of PAC, PAM, and CPAM in the coagulation tank are 50-80mg / L, 4-6mg / L, and 2-4mg / L respectively; then fully mixed and reacted for 15 minutes at a stirring speed of 150-200rpm to make the impurities in the waste liquid Form floc particles and suspend them in water to obtain wastewater treated by coagulation reaction;

[0032] Step S3. Air flotation treatment: Use an air compressor to pressurize, and use th...

Embodiment 2

[0036] refer to figure 2 Purification of raw hide pre-soaking wastewater from goat leather tannery:

[0037] Step S1. Filtration of immersion waste liquid: filter the discharged immersion waste liquid with a rotary mechanical grid with a rake tooth grid gap of 2 mm, and then collect the waste liquid in a coagulation tank;

[0038] Step S2. Coagulation reaction: Add the pre-dissolved polyaluminum chloride (PAC), nonionic polyacrylamide (PAM) and cationic polyacrylamide (CPAM) into the coagulation tank successively to make the mixture The concentrations of PAC, PAM, and CPAM in the coagulation tank are 70-90mg / L, 4-6mg / L, and 3-5mg / L respectively; then fully mixed and reacted for 10 minutes at a stirring speed of 150-200rpm to make the impurities in the waste liquid Form floc particles and suspend them in water to obtain wastewater treated by coagulation reaction;

[0039] Step S3. Air flotation treatment: use water ejector to pressurize, adopt the pre-pump pressurization metho...

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Abstract

The invention provides a purification treatment method of raw hide pre-soaking liquid waste. The method comprises following steps in sequence: filtration of soaking liquid waste, coagulation reaction,air floatation treatment, recycling or concentrated crystallization of effluent and dehydration drying treatment of dross. The principle is that the raw hide pre-soaking liquid waste with complicatedcomposition and high suspended matter content is efficiently and rapidly treated on the basis of advantages of an air flotation method, clear water obtained after treatment can be directly recycled or concentrated, when the effluent is recycled for a leather making process of raw hides, quality consistency of final leather products can be guaranteed due to low impurity content, consumption of water for leather making and consumption of sodium chloride are effectively reduced, when concentration of sodium chloride in the effluent is higher, concentration can be performed directly for recovering sodium chloride, so that content of chlorine ions in leather making comprehensive wastewater is effectively reduced, and up-to-standard discharge of wastewater is realized.

Description

【Technical field】 [0001] The invention relates to the technical field of water treatment, in particular to a method for purifying and treating waste water presoaked in tanning hides and hides, so as to realize the effective reuse of the waste water and reduce the pollution of sodium chloride in the waste water. 【Background technique】 [0002] Salting and anticorrosion has always been the most conventional way of preserving hides and hides for tanning processing. Usually, 20-40% of the weight of fresh hides and hides should be used in the salting process. 17:23-24). Although the current tanning enterprises will recover the solid salt on the raw hides and skins by shaking and desalting mechanically before processing, most of the salt still remains in the raw hides and enters the soaking solution during the pre-soaking process (Jan-Ties Pelckmans, Methods to reduce salt content in tannery wastewater, China Leather, 2005, 1:42-45). Statistics show that more than 300kg of sodiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10C02F103/24C02F101/12
CPCC02F1/001C02F1/04C02F1/24C02F1/5236C02F1/56C02F9/00C02F2101/12C02F2103/24
Inventor 马贺伟
Owner JIAXING UNIV
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