A high-nitrogen printing wastewater treatment and reuse system and its application method

Abstract

The invention relates to a high-nitrogen printing wastewater treatment and reuse system and a use method thereof. The high-nitrogen printing wastewater treatment and reuse system comprises four subsystems: a first subsystem: a high-concentration organic wastewater treatment system in a pretreatment section before printing; a second subsystem: a high-nitrogen wastewater treatment system at a printing section; a third subsystem: a membrane depth treatment and reuse system; a fourth subsystem: a sludge reduction treatment system. According to the difference of water qualities and water quantitiesof all the sections in the printing process, wastewater is collected, is subjected to segregated treatment and is reused, wherein pretreatment wastewater, printing wastewater and rinsing wastewater respectively enter the first subsystem, the second subsystem and the third subsystem for treating; the generated sludge enters the fourth subsystem for reduction treatment. According to the system, theproblem of serious imbalance of carbon nitrogen ratio of the wastewater is solved by adopting an anaerobic ammonia oxidation technology. The method has the advantages that the system is highly integrated and is precisely controlled; the problems of difficulty in nitrogen removal of the printing wastewater and high cost can be effectively solved; meanwhile, the reduction of the sludge is realized.

Description

technical field

[0001] The invention belongs to the technical field of sewage treatment, in particular to a high-nitrogen printing wastewater treatment and reuse system and its application method. Background technique

[0002] Reactive printing is one of the most common processes in the dyeing and finishing process. Its technological process includes pretreatment and printing process. The pretreatment process generally includes three steps of conventional desizing, scouring and bleaching; the printing process includes base color dyeing-printing-drying-steaming-baking-washing-soaping- wash. Among them, the amount of desizing wastewater only accounts for about 10% of the total wastewater, but the contribution of the total COD amount accounts for 60% to 70%. The main pollutant in the desizing wastewater is the returned size, and the main components are starch and polyethylene. The COD value of diol PVA is as high as 20000-30000mg / L, the COD amount accounts for more than half ...

Examples

Embodiment 1

[0041] A textile limited liability company has an annual natural output of 6,500 tons of cotton yarn, 1,000 tons of knitted gray cloth, and 4.5 million pieces of knitwear. It is a textile enterprise integrating cotton spinning, knitting, printing and dyeing, and garment making. The dyeing and finishing wastewater of this enterprise is divided into desizing wastewater and wastewater generated during the printing process. The amount of desizing wastewater is 1600-2000m 3 / d, the amount of printing wastewater is 800~1000m 3 / d, desizing wastewater COD Cr The concentration is 20000~30000mg / L, COD Cr / BOD<0.3, belongs to refractory biodegradable wastewater. The nitrogen content of printing wastewater reaches 300-500mg / L, and the COD concentration is also 2000-3000mg / L. big. In order to meet the discharge standards and reduce operating costs, the company decided to adopt the high nitrogen printing wastewater treatment and recycling system integration process of the present invent...

Embodiment 2

[0047] A textile company is a large knitting printing and dyeing enterprise in China. It produces a combination of knitting and printing and dyeing, with a displacement of 10,000-12,000m 3 / d, the discharged wastewater contains a large amount of complex components such as residual dyes, slurry, surfactants, and alkali agents, and has the characteristics of large chroma, high concentration of organic matter, strong alkalinity, and large changes in water quality and quantity. The removal effect of chemical and biological methods is not ideal. The company's desizing wastewater volume is 6000 ~ 8000m 3 / d, the amount of printing wastewater is 2000-4000m 3 / d, desizing wastewater COD Cr The concentration is 20000~30000mg / L, COD Cr / BOD<0.3 belongs to refractory biodegradable wastewater. The nitrogen content of printing wastewater reaches 300-500mg / L, and the COD concentration is also 2000-3000mg / L. big. In order to meet the discharge standards and reduce operating costs, the c...

technical field

[0001] The invention belongs to the technical field of sewage treatment, in particular to a high-nitrogen printing wastewater treatment and reuse system and its application method. Background technique

[0002] Reactive printing is one of the most common processes in the dyeing and finishing process. Its technological process includes pretreatment and printing process. The pretreatment process generally includes three steps of conventional desizing, scouring and bleaching; the printing process includes base color dyeing-printing-drying-steaming-baking-washing-soaping- wash. Among them, the amount of desizing wastewater only accounts for about 10% of the total wastewater, but the contribution of the total COD amount accounts for 60% to 70%. The main pollutant in the desizing wastewater is the returned size, and the main components are starch and polyethylene. The COD value of diol PVA is as high as 20000-30000mg / L, the COD amount accounts for more than half ...

Examples

Embodiment 1

[0041] A textile limited liability company has an annual natural output of 6,500 tons of cotton yarn, 1,000 tons of knitted gray cloth, and 4.5 million pieces of knitwear. It is a textile enterprise integrating cotton spinning, knitting, printing and dyeing, and garment making. The dyeing and finishing wastewater of this enterprise is divided into desizing wastewater and wastewater generated during the printing process. The amount of desizing wastewater is 1600-2000m 3 / d, the amount of printing wastewater is 800~1000m 3 / d, desizing wastewater COD Cr The concentration is 20000~30000mg / L, COD Cr / BOD<0.3, belongs to refractory biodegradable wastewater. The nitrogen content of printing wastewater reaches 300-500mg / L, and the COD concentration is also 2000-3000mg / L. big. In order to meet the discharge standards and reduce operating costs, the company decided to adopt the high nitrogen printing wastewater treatment and recycling system integration process of the present invent...

Embodiment 2

[0047] A textile company is a large knitting printing and dyeing enterprise in China. It produces a combination of knitting and printing and dyeing, with a displacement of 10,000-12,000m 3 / d, the discharged wastewater contains a large amount of complex components such as residual dyes, slurry, surfactants, and alkali agents, and has the characteristics of large chroma, high concentration of organic matter, strong alkalinity, and large changes in water quality and quantity. The removal effect of chemical and biological methods is not ideal. The company's desizing wastewater volume is 6000 ~ 8000m 3 / d, the amount of printing wastewater is 2000-4000m 3 / d, desizing wastewater COD Cr The concentration is 20000~30000mg / L, COD Cr / BOD<0.3 belongs to refractory biodegradable wastewater. The nitrogen content of printing wastewater reaches 300-500mg / L, and the COD concentration is also 2000-3000mg / L. big. In order to meet the discharge standards and reduce operating costs, the c...

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