An integrated technology for separate treatment and reuse of complex printing and dyeing wastewater

Abstract

The invention relates to a complex printing and dyeing wastewater quality-divided treating and reusing integrated technology. The technology comprises two parts of quality-divided treating and quality-divided reusing, the whole technical process is realized through an automatic detection and control mode. For the characteristics that wastewater in a textile printing and dyeing garden is large in water quality change, high in chromaticity, difficult to biologically decompose and high in inorganic salt content, an existing efficient ozonation technology, an ultrafiltration-reverse osmosis membrane technology, an economical biochemical treatment technology, a double-tower filtration technology and an cation and anion exchange technology are integrated and optimized, for meeting the water quality requirement of water used in all processes of the garden, and efficient and low-cost treatment of the printing and dyeing wastewater is achieved by means of quality-divided treating and quality-divided reusing. Compared with a traditional treatment technology, though the water is more complex, high in chromaticity and difficult to decompose, treatment cost is lower, and the reuse rate of reclaimed water is larger and can reach 70-80%.

Description

technical field [0001] The invention belongs to the technical field of industrial waste water treatment, and in particular relates to an integrated technology for separate treatment and reuse of complex printing and dyeing waste water. Background technique [0002] my country is the largest country in textile printing and dyeing. The textile printing and dyeing industry plays a huge role in my country's national economy, but it creates huge economic benefits and also brings heavy pressure to water environmental protection. It has been listed as a key polluting industry in my country . According to incomplete statistics, the daily waste water discharged by the printing and dyeing industry is 3×10 6 -4×10 6 m 3 , has long been ranked among the forefront of water pollutant discharge in various industries in the country, and is one of the key pollution sources in my country's industrial system. Textile printing and dyeing wastewater has the characteristics of large chroma, hi...

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Problems solved by technology

[0003] At present, there are many treatment processes involving printing and dyeing wastewater. For example, the patent CN105060636A divides the printing and dyeing process into high-quality water use process and low-quality water use process. Different water use processes use different reclaimed water treatment technologies to save energy and improve reclaimed water reuse. , but this patent only involves common comprehensive wastewater treatment (both COD and chroma are relatively low), and whether its treatment process is suitable for complex high-concentration, high-chroma printing and dyeing wastewater remains to be studied; patent CN101293726B discloses a printing and dyeing wastewater treatment and The method of quality separation and reuse, that is, according to the water quality requirements of the water used in each process of the printing and dyeing process, the water quality of each level of wastewater treatment is used in different processes of the printing and dyeing process, but this patent only uses COD as the evaluation of wastewater treatment and reclaimed water reuse indicators, and with the application of various anti-oxidation and anti-biodegradation additives and dyes, the removal of chroma and the size of chroma should also be used as important evaluation indicators for reclaimed water reuse. In addition, the COD of wastewater treated by this patent is 1500-5000mg / L, the COD concentration varies greatly, but no separate treatment is implemented, which is unfavorable for the control of wastewater treatment costs; the article "Research on the Separate Treatment of Printing and Dyeing Wastewater" is based on the "deboiling and bleaching" wastewater and dyeing wastewater Different treatment processes are adopted for different properties to achieve the purpose of low operating cost and good effect, but this is of little practical significance for textile printing and dyeing parks that centrally treat wastewater, because if each printing and dyeing factory treats wastewater according to different processes Separate them and then send them to the wastewater treatment plant for centralized treatment. This will consume a lot of manpower and financial resources for the management of the wastewater treatment plant and the layout of the wastewater pipe network. Moreover, the fabrics produced by different factories are different. Even if the dyeing process is the same, the quality of the wastewater It is not the same, so it is not meaningful to separate the waste water according to the process and treat it centrally

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