A method and device for realizing purification and recovery of mercerized light alkali
A recovery device and technology for light alkali, which are applied in chemical instruments and methods, reflux water treatment, multi-stage water treatment, etc., can solve the problem of waste alkali treatment effect, unsatisfactory recovery effect, low alkali concentration, and difficult pollutant treatment. and other problems, to achieve the effect of saving resources and operating costs, improving alkali recovery rate, and facilitating disassembly and assembly
Active Publication Date: 2018-04-10
DALIAN UNIV OF TECH
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Problems solved by technology
[0005] The object of the present invention is to provide a kind of lye that can purify mercerizing light lye, which is difficult to recycle because of its low concentration of alkali, difficult to handle pollutants such as dirt slurry additives, and easy to form secondary pollution. The lye and the method of realizing alkali recovery and water reuse, this method has high pollutant removal and alkali recovery rate, and solves the technical problems of unsatisfactory waste alkali treatment effect and recovery effect existing in the prior art
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Embodiment 1
[0033] The lye that enters the light lye purification and recovery device is the drainage of the multi-effect washing section of the mercerizing process. Water quality: COD≤1500mg / L, suspended solids≤500mg / L, conductivity≤200ms / cm (mostly sodium ions and hydroxide ions, containing a small amount of calcium, magnesium, iron, hydroxide, sulfate and other ions).
[0034] The device includes two parts: pretreatment and membrane concentration purification recovery system.
[0035] Pretreatment includes self-cleaning filter and precision filter: self-cleaning filter is used to remove large particle suspended matter and mechanical impurities, suspended matter in effluent ≤ 10mg / L; precision filter removes remaining suspended matter (suspended COD), colloid and impurities , effluent suspended matter 0.
[0036] The membrane concentration purification recovery system is a nanofiltration membrane device. The nanofiltration membrane can effectively remove most of the remaining organic ...
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The present invention belongs to the technical field of cleaner production of industrial enterprises, and provides a mercerized light alkaline purification recovery method and apparatus. A water inlet end of a light alkaline liquid booster pump is connected with a light alkaline liquid collecting tank, a water outlet end of the light alkaline liquid booster pump is connected with a water inlet end of a self-cleaning filter; a water inlet end of a precision filter is connected with a reducing agent dosing device, a water outlet end of the precision filter is connected with the self-cleaning filter; the water outlet end of the precision filter is connected with a scale inhibitor dosing device, the water outlet end of the precision filter is connected with a water inlet of a first-section high pressure pump; a water outlet of the first-stage high pressure pump is connected with a two-stage high pressure pump, and the two-stage high pressure pump is connected with a water inlet end of a nanofiltration membrane member; and a water outlet of the nanofiltration membrane member is communicated with a light alkaline liquid recycling pipeline. By testing, a high quality light alkaline liquid after pretreatment and nanofiltration membrane recovery is suitable for reuse in printing and dyeing workshops, is especially can be used as a low concentration alkaline liquid for being used with a high concentration recovered alkaline liquid for preparation, and can meet the mercerizing process alkali requirements.
Description
technical field [0001] The invention belongs to the technical field of clean production (waste treatment and reuse) of industrial enterprises, and relates to the recycling and utilization of printing and dyeing mercerized light alkali, in particular to a method for purifying and recycling mercerized light alkali based on nanofiltration membrane separation technology and devices. Background technique [0002] The printing and dyeing industry uses a large amount of liquid caustic soda (50% sodium hydroxide solution) in the pre-treatment production process for resizing and mercerizing treatment, resulting in high pH value of sewage discharge. Among them, the mercerizing process is to treat pure cotton or high cotton content yarn and fabric with high concentration sodium hydroxide solution under certain tension conditions to increase its surface gloss and make it have better dimensional stability. Improve the fabric's ability to absorb dyes, increase dyeing uniformity and color...
Claims
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IPC IPC(8): C02F9/02
CPCC02F1/001C02F1/442C02F9/00C02F2301/04C02F2301/08
Inventor 张芸代文臣徐晓晨于伟程杨凤林
Owner DALIAN UNIV OF TECH