Fenton printing-dyeing-wastewater deep treatment method

Abstract

The invention provides a Fenton printing-dyeing-wastewater deep treatment method. The Fenton printing-dyeing-wastewater deep treatment method includes the steps that 1, pretreated wastewater flows into a Fenton chemical feeding pond, and ferrous sulfate, hydrogen peroxide and sulfuric acid are sequentially put into the Fenton chemical feeding pond; 2, the wastewater flows through three boxes of the Fenton chemical feeding pond to enter a Fenton reaction pond, the mixture is sufficiently stirred in the Fenton reaction pond to be subjected to a Fenton reaction, and the wastewater obtained after the Fenton reaction is subjected to aeration treatment and then enters a flocculation pond; 3, alkali is added into the flocculation pond, the PH value is adjusted to 6.5 to 7, and polymeric flocculants are added to carry out a flocculation reaction; 4, the wastewater in the flocculation pond enters a settling pond to be subjected to mud-water separation after being subjected to the flocculation reaction, and the settling time ranges from 2.5 h to 3.0 h. The Fenton printing-dyeing-wastewater deep treatment method has the advantages of being high in practicability, efficiency, reliability, stability, automation degree and the like; treatment cost is low, running and operation are easy and convenient, and the removing rate is high and stable.

Description

technical field [0001] The invention relates to a method for advanced treatment of printing and dyeing wastewater by Fenton. Background technique [0002] Printing and dyeing, also known as dyeing and finishing. It is a processing method, and it is also a general term for pretreatment, dyeing, printing, finishing, washing, etc. Printing and dyeing wastewater is wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, chemical fibers and their blended products. Printing and dyeing wastewater has a large amount of water, 100-200 tons of water is consumed per ton of textile printing and dyeing, of which 80-90% becomes wastewater. Textile printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, high alkalinity, and large changes in water quality. It is one of the most difficult industrial wastewater to treat. Impurities, sand substances, inorganic salts, etc. [0003] The main method...

AI Technical Summary

Problems solved by technology

[0005] Recently, it has been found that the chemical oxygen demand (CODcr) of the wastewater produced by dyeing of aramid high-temperature and high-pressure carriers in printing and dyeing cannot meet the first-level discharge standards of the Taihu Lake Basin stipulated by the state through conventional physical and chemical, hydrolytic acidification, and activated sludge methods. , in order to minimize environmental pollution, save national resources, and achieve sustainable development, it is particularly important to find an effective advanced treatment method for chemical oxygen demand (CODcr)

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