A pretreatment method and device for ramie degumming wastewater

A technology of pretreatment and degumming, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of secondary pollution of coagulants and flocculants, and save manpower , Avoid secondary pollution, easy to operate

Active Publication Date: 2016-04-27
JIANGXI ENDAMA CENTURY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are several deficiencies in this process: 1. The ratio and usage of coagulant and flocculant need frequent debugging and strict control; 2. Coagulant and flocculant produce "secondary pollution"; 3. Coagulation The cost of chemical reagents and flocculants accounts for about half of the total operating cost of sewage treatment

Method used

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  • A pretreatment method and device for ramie degumming wastewater
  • A pretreatment method and device for ramie degumming wastewater
  • A pretreatment method and device for ramie degumming wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A kind of pretreatment method of ramie degumming waste water, comprises the following steps:

[0055] The alkaline degumming black liquor and acidic waste liquor produced in the chemical degumming method to remove the ramie colloid are passed into the pickling tank and the degumming tank respectively, then the alkaline degumming black liquor and the acidic waste liquor are mixed in the first mixing tank, and the acidic waste liquor is mixed with sulfuric acid After adjusting the pH to 2, the liquid is passed into the separation device. The separation device adopts the horizontal flow sedimentation method to remove the flocs and then passes the clear liquid into the second mixing tank. At the same time, the alkaline cleaning wastewater in the degumming tank is passed into the In the second mixing tank, after mixing the liquid in the second mixing tank and adjusting the pH to 6, the subsequent biological treatment can be carried out.

Embodiment 2

[0057] A kind of pretreatment method of ramie degumming waste water, comprises the following steps:

[0058] The alkaline degumming black liquor and acidic waste liquor produced in the chemical degumming method to remove the ramie colloid are passed into the pickling tank and the degumming tank respectively, then the alkaline degumming black liquor and the acidic waste liquor are mixed in the first mixing tank, and then mixed with hydrochloric acid After adjusting the pH to 3, the liquid is passed into the separation device. The separation device uses the air flotation method to remove the flocs and then passes the clear liquid into the second mixing tank. At the same time, the alkaline cleaning wastewater in the degumming tank is passed into the second mixing tank. The second mixing tank, after mixing the liquid in the second mixing tank and adjusting the pH to 7, the subsequent biological treatment can be carried out.

Embodiment 3

[0060] A kind of pretreatment method of ramie degumming waste water, comprises the following steps:

[0061] The alkaline degumming black liquor and acidic waste liquor produced in the chemical degumming method to remove the ramie colloid are passed into the pickling tank and the degumming tank respectively, then the alkaline degumming black liquor and the acidic waste liquor are mixed in the first mixing tank, and then mixed with hydrochloric acid After adjusting the pH to 4, the liquid is passed into the separation device. The separation device uses sand filtration to remove flocs and then passes the clear liquid into the second mixing tank. At the same time, the alkaline cleaning wastewater in the degumming tank is passed into the second mixing tank. In the mixing tank, after mixing the liquid in the second mixing tank and adjusting the pH to 8, the subsequent biological treatment can be carried out.

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Abstract

The invention relates to the field of treatment of ramie wastewater, in particular to a pretreatment method of ramie degumming wastewater and a device adopting the same. The pretreatment method of the ramie degumming wastewater comprises the following steps: adopting a chemical degumming method to remove an alkali degumming black liquor, alkali washing wastewater and a waste acidic liquor generated from the ramie gum, respectively collecting the liquors, mixing the alkali degumming black liquor with the waste acidic liquor, adjusting the pH value to 2-4, removing flocculates to obtain a clear solution, and mixing the clear solution with the alkali washing wastewater to obtain liquid with the pH value of 6-8. The pretreatment method of the ramie degumming wastewater, provided by the invention, can enable the color of the wastewater to become faint yellow from dark brown black, obviously decreases the chromaticity, reaches the COD (Chemical Oxygen Demand) concentration of the mixed wastewater after pretreatment to be less than 3000 mg / L, is low in cost, simple in control and operation of the pH value, high in reliability, simple and feasible, and can avoid secondary pollution due to a flocculation medicament. The invention further provides a device for the pretreatment method, so as to enable the pretreatment method to be easy to operate, reduce the pollution, and meanwhile save a lot of manpower.

Description

technical field [0001] The invention relates to the field of ramie wastewater treatment, in particular to a pretreatment method and device for ramie degumming wastewater. Background technique [0002] At present, chemical degumming and biological degumming are often used to remove the gum in ramie. Among them, the chemical degumming method is to use NaOH to cook the ramie at high temperature and certain pressure to remove the colloid in the ramie. The NaOH solution is boiled under high temperature and certain pressure conditions, the lye is drained, and then washed with water. After being out of the pot, the hemp will become dry hemp after processes such as kneading, bleaching, pickling, oiling, and drying. [0003] Ramie degumming wastewater is one of the most difficult industrial wastewater to treat. According to the source, degumming wastewater can be divided into degumming black liquor discharged from ramie through alkali boiling, hemp washing wastewater, pickling waste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 邱新海黄建新褚特野张凯锋黄小青赵志慧黄成锋
Owner JIANGXI ENDAMA CENTURY TECH
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