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Deep treatment method for printing ink wastewater by membrane method

A technology for advanced treatment and ink wastewater, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve problems such as poor stability, difficult water chroma to meet discharge standards, environmental pollution, etc. , to achieve good treatment effect, good social and economic benefits

Active Publication Date: 2013-04-17
SUZHOU FAITH HOPE MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional treatment method is to add acid, coagulate, and then carry out solid-liquid separation by air flotation or precipitation. However, in view of the fact that the composition of ink wastewater is variable due to different printing products in the actual production process, this traditional method is used for treatment. The stability is very poor, and the soluble pollutants in the wastewater cannot be removed, which makes it difficult for the chroma and COD of the treated water to meet the discharge standards, and there is still environmental pollution

Method used

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  • Deep treatment method for printing ink wastewater by membrane method

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Embodiment 1

[0025] A method for the advanced treatment of membrane-based ink wastewater, comprising the steps of:

[0026] S1. Coagulation: inject ink wastewater into the reaction tank, add hydrochloric acid (pH regulator) to the reaction tank to adjust the pH value of the wastewater to 3, then add coagulant and coagulant aid to the reaction tank, and the coagulant The addition amount is 100mg / L, the addition amount of the coagulant aid is 0.6mg / L, stir to make the components in the reaction box fully mix and react to form flocs. Among them, the coagulant is a mixture of ferrous chloride, ferric sulfate, aluminum sulfate, polyaluminum chloride, polyacrylamide, and alum, and the coagulant aid is acid, alkali, lime, chitosan, activated silicic acid, diatom soil mixture.

[0027] S2. Press filtration: Use a suction pump to pump the flocs in the reaction tank into a plate-and-frame filter press (automatic or mechanical) for solid-liquid separation, and separate the solids pressed out by the ...

Embodiment 2

[0035] Step is with embodiment 1, difference is:

[0036] The pH value in step S1 is 4, the pH regulator is sulfuric acid, the add-on of coagulant is 50mg / L, the add-on of coagulant aid is 0.4mg / L, and coagulant is ferrous chloride, ferric sulfate, The mixture of aluminum sulfate, polyaluminum chloride, coagulation aid is the mixture of acid, alkali, lime, chitosan; The pH value in step S3 is 7; The membrane assembly in step S5 is a microfiltration membrane; Advanced treatment is nanofiltration.

[0037] The final target treated water has chromaticity<1, COD<60, SS<1, which has reached the discharge standard and can be directly discharged into the municipal sewage pipe network through pipelines.

Embodiment 3

[0039] Step is with embodiment 1, difference is:

[0040] The pH value in step S1 is 5, the pH regulator is nitric acid, the add-on of coagulant is 150mg / L, the add-on of coagulant aid is 0.3mg / L, and coagulant is ferrous chloride, ferric sulfate, The mixture of polyacrylamide and alum, the coagulation aid is a mixture of acid, activated silicic acid, diatomaceous earth, chitosan; the pH value in step S3 is 8; the membrane module in step S5 is an ultrafiltration membrane; step S6 The advanced treatment in the process is activated carbon adsorption.

[0041] The chroma of the final target treated water is <5, COD<100, SS<2, which has reached the discharge standard and can be directly discharged into the municipal sewage pipe network through pipelines.

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Abstract

The invention discloses a deep treatment method for printing ink wastewater by a membrane method. The method comprises the following steps: S1, coagulating; S2, filtering and pressing; S3, adjusting the pH value; S4, roughly filtering; S5, implementing the membrane filtration; S6, implementing the deep treatment; and S7, recovering waste liquid. The deep treatment method for the printing ink wastewater by the membrane method has the benefits that various composed printing ink wastewater can be treated better with stable treatment effect, most soluble and dissoluble pollutants in the printing ink wastewater are removed to enable the chromaticity and the COD (Chemical Oxygen Demand) of the printing ink wastewater to achieve the emission standard, and the method has excellent social and economic benefits.

Description

technical field [0001] The invention relates to a method for advanced treatment of ink wastewater by a membrane method, which is especially suitable for the treatment of ink wastewater in the carton packaging industry and belongs to the field of water treatment. Background technique [0002] The waste liquid produced in the production process of the carton packaging industry is a high-concentration, complex and changeable water-soluble ink wastewater, which contains a large number of chemical substances and various mixed waste inks, with high concentration, high COD, and high chroma. If it is discharged directly, it will cause great pollution to the environment. At present, the traditional treatment method is to add acid, coagulate, and then carry out solid-liquid separation by air flotation or precipitation. However, in view of the fact that the composition of ink wastewater is variable due to different printing products in the actual production process, this traditional me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 胡文翰刘流刘栋杨乾李屹王开宇肖有昌
Owner SUZHOU FAITH HOPE MEMBRANE TECH
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