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A treatment method for printing and dyeing mercerizing wastewater that realizes alkali recovery

A treatment method and wastewater technology, which is applied in textile industry wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of ineffective use of alkali recycling, inability to efficiently treat mercerized light alkali wastewater, etc., and achieve Small footprint, fast processing speed, and reduced production costs

Active Publication Date: 2021-05-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is, aiming at the problem that the prior art cannot efficiently process mercerized light alkali wastewater, and at the same time, the prior art cannot effectively utilize the recovery and utilization of the alkali produced after the treatment of mercerized light alkali wastewater. High-efficiency, energy-saving, realize resource recycling, can meet the printing and dyeing mercerizing wastewater treatment method of light alkali wastewater reuse requirements

Method used

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  • A treatment method for printing and dyeing mercerizing wastewater that realizes alkali recovery

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Experimental program
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Effect test

Embodiment 1

[0035] A treatment method for printing and dyeing mercerizing wastewater that realizes alkali recovery, comprising the following steps:

[0036] S1: Pass the light alkali wastewater generated in the mercerizing process in the light alkali pool 1 into the coagulation pool 3 through the valve 6, and carry out coagulation treatment in the coagulation pool 3, and add PAC coagulant through the dosing hopper 2 , the dosing amount is added according to the content of 120 milligrams per liter according to the amount of waste water to be treated, and stirred for 2 minutes at 200 revolutions per minute by the stirring paddle 7, stirred for 3 minutes at 150 revolutions per minute, and stirred for 5 minutes at 40 revolutions per minute. Minute slow stirring mode for stirring;

[0037] S2: The clear liquid after coagulation in the coagulation tank 3 is passed into the membrane separation device 4, and the alkali-resistant ultrafiltration membrane with a molecular weight cut-off of 1w is us...

Embodiment 2

[0042] A treatment method for printing and dyeing mercerizing wastewater that realizes alkali recovery, comprising the following steps:

[0043] S1: Pass the light alkali wastewater generated during the printing and dyeing process in the light alkali pool 1 into the coagulation pool 3 through the valve 6, and carry out coagulation treatment in the coagulation pool 3. The specific steps of the coagulation treatment are as follows:

[0044] 1) Select 120mg / L of PAC coagulant, 15mg / L of auxiliary agent and 150pcs / L of micro-magnetic beads in sequence according to the following doses, and set aside; the diameter of the micro-magnetic beads is 50 μm, and the outer layer is coated with a ceramic outer layer Floor. The auxiliary agent is deionized water containing 8% sodium alginate, 3% alkaline sodium silicate and 1.2% succinic anhydride in mass percentage.

[0045] 2) After freezing the micro-magnetic beads to -5°C, cool down to -9°C at a rate of 1°C / min. During the cooling period...

Embodiment 3

[0052] A treatment method for printing and dyeing mercerizing wastewater that realizes alkali recovery, comprising the following steps:

[0053] S1: Pass the light alkali wastewater generated during the printing and dyeing process in the light alkali pool 1 into the coagulation pool 3 through the valve 6, and carry out coagulation treatment in the coagulation pool 3. The specific steps of the coagulation treatment are as follows:

[0054] 1) Select 120mg / L of PAC coagulant, 15mg / L of auxiliary agent and 150pcs / L of micro-magnetic beads in sequence according to the following doses, and set aside; the diameter of the micro-magnetic beads is 80 μm, and the outer layer is coated with a ceramic coating Floor. The auxiliary agent is deionized water containing 8% sodium alginate, 3% alkaline sodium silicate and 1.2% succinic anhydride in mass percentage.

[0055] 2) After freezing the micro-magnetic beads to -5°C, cool down to -9°C at a rate of 2°C / min. During the cooling period, sp...

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Abstract

The invention discloses a treatment method of printing and dyeing mercerizing wastewater capable of realizing alkali recovery. The method includes the following steps: S1: coagulation, adding PAC coagulant to the mercerizing wastewater, stirring at a slow speed, and coagulation treatment; S2: Membrane separation, the wastewater after coagulation treatment is introduced into the membrane separation device to remove organic matter in the wastewater; S3: decolorization, a small amount of ozone is introduced for decolorization treatment; S4: evaporation and concentration, using MVR mechanical compression evaporation device for concentration. The method of the invention can remove various impurities in the mercerizing wastewater, and can concentrate and reuse the light alkali wastewater. On the one hand, it can treat the printing and dyeing mercerizing wastewater, and on the other hand, it can save energy consumption and recover alkali resources.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing mercerizing wastewater treatment, in particular to a treatment method for printing and dyeing mercerizing wastewater that realizes alkali recovery. Background technique [0002] The textile industry is a large discharge of industrial wastewater. According to incomplete statistics in the middle of the last century, the discharge of textile printing and dyeing wastewater ranks sixth among all industries in my country, reaching 10,000 tons per day. By the turn of the century, the wastewater from the textile industry accounted for the largest national industrial wastewater discharge, and its total wastewater discharge ranked fifth in the national industrial industry, with a total amount of 100 million tons per year, of which printing and dyeing wastewater was about 100 million tons (accounting for 100 million tons of textile printing and dyeing wastewater, It accounts for about 10,000 tons...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F9/12C02F103/30C02F101/30
CPCC02F1/041C02F1/444C02F1/48C02F1/5245C02F1/78C02F9/00C02F2101/30C02F2103/30
Inventor 许柯沈舒新任洪强耿金菊
Owner NANJING UNIV