Method and device for treating printing and dyeing wastewater by using macroporous adsorption resin

Abstract

The invention relates to a method and a device for treating printing and dyeing wastewater by using a macroporous adsorption resin. The method comprises the following technical steps: (1) adding a sodium hydroxide solution to an acidity and alkalinity regulating pond, regulating the pH value of the printing and dyeing wastewater to be more than 8.5, and then discharging the printing and dyeing wastewater into a primary precipitation pond, charging 25% of ferrous sulfate into the primary precipitation pond so as to carry out coagulating precipitation on the printing and dyeing wastewater, discharging the coagulated and precipitated printing and dyeing wastewater into a hydrolyzation pond so as to carry out anaerobic hydrolysis on the printing and dyeing wastewater, precipitating the printing and dyeing wastewater in a secondary precipitation pond, and discharging the printing and dyeing wastewater into an aeration pond so as to carry out aerobic aeration biological treatment on the printing and dyeing wastewater; (2) discharging the aerated wastewater into a tertiary precipitation pond and then filtering suspended solids in the wastewater through a sand filter tank; and (3) enabling sand filtered water to enter a macroporous adsorption resin fixed bed, adsorbing the sand filtered water through the macroporous adsorption resin fixed bed and discharging out the adsorbed water. The wastewater treatment method provided by the invention has the advantages as follows: through the adoption of the macroporous adsorption resin with large specific surface area, high adsorbing efficiency, low cost and simple regeneration, the treatment is efficient, economic, stable, reliable, low-carbon and environment-friendly and adapts to time development; and the wastewater treatment method can be promoted and used in printing and dyeing wastewater treatment.

Description

technical field [0001] The invention relates to a method and a device for treating wastewater, in particular to a method and a device for treating printing and dyeing wastewater with a macroporous adsorption resin, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] As one of the traditional pillar industries with advantages in our country, the textile printing and dyeing industry has developed rapidly since the 1990s, and its water demand and drainage have also increased significantly. With the development of processing technology and the continuous development and application of new dyes and auxiliaries, the difficulty of printing and dyeing wastewater treatment is also increasing. Moreover, with the continuous rise of water charges and increasingly stringent discharge standards, the problems of water and drainage in the printing and dyeing industry have become increasingly prominent , the treatment of printing and dyeing wa...

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Problems solved by technology

The operating cost of the biological aerated filter is low, but it is greatly affected by the change of water quality; the Fenton method needs to adjust the pH and add a large amount of iron salt, resulting in a high salt content in the effluent, which is not conducive to reuse, and will also form a large amount of pollution. mud, which increases the difficulty of treatment; the decolorization effect of the ozone oxidation method is good, but it consumes a lot of power, the cost is high, and it is difficult to popularize and apply it on a large scale; activated carbon is a very effective adsorbent in water treatment, but its regeneration cost is relatively high. High; the main obstacle of membrane separation technology is the high cost of the membrane, and the lifespan is not long, and it is not suitable for large-scale application

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