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Treatment process for degradation of high-concentration organic matter and reduction of total nitrogen in printing and dyeing wastewater

A printing and dyeing wastewater and treatment process technology, which is applied in textile industry wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., to achieve the effect of improving denitrification effect, optimizing treatment process, and good removal effect

Inactive Publication Date: 2015-07-29
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilize the higher content of VFAs in the supernatant after hydrolysis to increase the content of organic carbon in sewage, and the use of VFAs produced by the hydrolysis of high-concentration organic pollutants as a carbon source for denitrification has not attracted enough attention.

Method used

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  • Treatment process for degradation of high-concentration organic matter and reduction of total nitrogen in printing and dyeing wastewater
  • Treatment process for degradation of high-concentration organic matter and reduction of total nitrogen in printing and dyeing wastewater
  • Treatment process for degradation of high-concentration organic matter and reduction of total nitrogen in printing and dyeing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The raw water in the examples is taken from the wastewater regulating pond of a printing and dyeing enterprise, and is divided into pretreatment wastewater and dyeing wastewater. The pretreatment wastewater is mainly composed of wastewater generated from desizing, scouring and rinsing. Dyeing wastewater is mainly composed of dyeing, printing and denim wastewater, and the influent water quality is shown in Table 1. UASB inoculation sludge adopts citric acid plant granular sludge, MLSS in which the mass concentration ratio of volatile suspended solids and suspended solids in the inoculation sludge is ρ(VSS) / ρ(SS)=0.70. The ρ(SS) of inoculated sludge=50.33g / L. The seed mud is black, and the particle size is mainly 1-3mm. The ascending velocity of the UASB reactor is 1m / h, and the temperature is controlled at 35-40°C. By adjusting the anaerobic hydrolysis time of dyeing wastewater, the production of volatile fatty acids is controlled. result( figure 1 , Table 2) show th...

Embodiment 2

[0028] The raw water in the examples is taken from the wastewater regulating pond of a printing and dyeing enterprise, and is divided into pretreatment wastewater and dyeing wastewater. The pretreatment wastewater is mainly composed of wastewater generated from desizing, scouring and rinsing. Dyeing wastewater is mainly composed of dyeing, printing and denim wastewater, and the influent water quality is shown in Table 1. UASB inoculation sludge adopts citric acid plant granular sludge, MLSS in which the mass concentration ratio of volatile suspended solids and suspended solids in the inoculation sludge is ρ(VSS) / ρ(SS)=0.70. The ρ(SS) of inoculated sludge=50.33g / L. The seed mud is black, and the particle size is mainly 1-3mm. The ascending velocity of the UASB reactor is 1m / h, and the temperature is controlled at 35-40°C. Adjust the pre-treatment wastewater hydraulic retention time to 20h, 40h, 60h, 80h respectively. result( figure 2 ) shows that when the hydraulic retenti...

Embodiment 3

[0030] The raw water in the examples is taken from the wastewater regulating pond of a printing and dyeing enterprise, and is divided into pretreatment wastewater and dyeing wastewater. The pretreatment wastewater is mainly composed of wastewater generated from desizing, scouring and rinsing. Dyeing wastewater is mainly composed of dyeing, printing and denim wastewater, and the influent water quality is shown in Table 1. UASB inoculation sludge adopts citric acid plant granular sludge, MLSS in which the mass concentration ratio of volatile suspended solids and suspended solids in the inoculation sludge is ρ(VSS) / ρ(SS)=0.70. The ρ(SS) of inoculated sludge=50.33g / L. The seed mud is black, and the particle size is mainly 1-3mm. The ascending velocity of the UASB reactor is 1m / h, and the temperature is controlled at 35-40°C. The hydraulic retention time of the pre-treatment wastewater is 60h, and the hydraulic retention time of the dyeing wastewater is 15h. The two effluents are...

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Abstract

The invention discloses a treatment process of degrading high-concentration organic substances and reducing total nitrogen in printing and dyeing wastewater. In order to solve the problems in the printing and dyeing wastewater that the organic substances which are difficult to degrade are high in content, the carbon source is low in quality, the nitrogen pollutants are high in concentration and the like, the treatment process disclosed by the invention comprises the following steps: performing different-quality collection on the wastewater which is divided into preliminary treatment wastewater and dyeing wastewater; fully degrading the organic substances which are difficult to degrade and exist in the preliminary treatment wastewater by utilizing a multistage anaerobic process; performing control analysis on volatile fatty acids of effluent obtained via the anaerobic hydrolysis of the dyeing wastewater; extracting the applicable basic carbon source required by a subsequent denitrification nitrogen removal unit, thereby realizing the stable removal of the nitrogen pollutants. The treatment process has good effects for removing CODCr, ammonia nitrogen and the total nitrogen in the printing and dyeing wastewater. In the final effluent, the content of the CODCr is less than 200mg / L, the content of the ammonia nitrogen is less than 10mg / L and the content of the total nitrogen is less than 15mg / L, thereby meeting the water quality standard of the printing and dyeing wastewater discharged into urban sewers and providing the foundation for the deep treatment of the printing and dyeing wastewater.

Description

technical field [0001] The invention belongs to a wastewater treatment method, and relates to a method for degrading organic matter in printing and dyeing wastewater and reducing total nitrogen. Background technique [0002] Printing and dyeing wastewater has always been the focus and difficulty of wastewater treatment process research due to its large discharge volume and high difficulty in treatment. According to the survey, there are nearly 3,000 textile printing and dyeing enterprises in the Taihu Lake Basin, and the annual discharge of printing and dyeing wastewater is 350 million tons. One of the key polluting industries. As we all know, a large amount of dyes and auxiliaries are used in the printing and dyeing process, including a large amount of azo dyes and urea, which increases the content of organic nitrogen in wastewater to a certain extent. [0003] Printing and dyeing wastewater has complex components and high content of refractory organic matter, which belon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F103/30
Inventor 操家顺李超唐思远薛朝霞方芳冯骞林俊雄周明江心
Owner HOHAI UNIV
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