Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for efficiently treating and recycling sewage in printing and dyeing industry

A sewage and high-efficiency technology, which is applied in the field of high-efficiency sewage treatment and reuse in the printing and dyeing industry, can solve the problems of long process, time-consuming and energy consumption, and achieve the effects of shortening the process, improving the degree of waste water resource utilization, and reducing the load

Inactive Publication Date: 2020-04-10
TIANJIN MOTIMO MEMBRANE TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the existing method has a long process and consumes time and energy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The hollow fiber decolorization membrane is used to treat the wastewater using anaerobic microorganisms, and the effluent from two reservoirs has a recovery rate of 50%, a pressure of 0.1 MPa, a temperature of 34°C, and a pH of 6.7. The produced water is recycled, and the concentrated water is also oxidized with sodium hypochlorite and discharged up to standard. No need to use other membrane materials, such as membrane bioreactor (MBR), ultrafiltration, reverse osmosis, etc., to realize the "short process" sewage treatment and recycling process. The indicators are summarized in Table 1.

Embodiment 2

[0017] The hollow fiber decolorization membrane is used to treat the MBR product water, and the ultrafiltration and reverse osmosis membrane are no longer used for water recovery, and the rest is the same as that of Example 1.

Embodiment 3

[0019] The reverse osmosis concentrated water is treated with hollow fiber decolorizing membrane, and 50% is recovered from the concentrated water. The concentrated water of the decolorizing membrane is also oxidized with sodium hypochlorite and discharged after reaching the standard. The overall wastewater discharge is reduced to 25%, achieving the purpose of reducing wastewater discharge.

[0020] surface .Comparison of different sewage treatment processes

[0021] Energy consumption, kW·h / ton Operating cost, yuan / ton Salt recovery, % comparative example 2.7 2.6 0 Example 1 0.41 0.35 50 Example 2 0.78 0.83 50 Example 3 1.95 1.94 25

[0022] It can be seen from the above table that after adopting the hollow fiber decolorizing membrane, no matter what kind of process is used, the energy consumption and cost of recovering each ton of water are greatly reduced, and the salt in it can also be recovered at the same time. In par...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for efficiently treating and recycling sewage in the printing and dyeing industry. According to the invention, the hollow fiber decolorizing membrane is used for treating the wastewater which is treated by anaerobic microorganisms and is discharged from two reservoirs, the recovery rate is 50%, the pressure is 0.1 MPa, the temperature is 34 DEG C, and the pH valueis 6.7; produced water is recycled, and concentrated water is also oxidized by sodium hypochlorite and then discharged after reaching the standard. According to the method, the process is greatly shortened, and the investment cost and the operation cost are greatly reduced. The method can remove dirt in a targeted manner and is low in energy consumption.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, and more specifically relates to a method for efficient treatment and reuse of sewage in the printing and dyeing industry. Background technique [0002] At present, the common method of treating industrial wastewater (especially printing and dyeing wastewater) in the market is to remove pollutants by biochemical degradation, and then use reverse osmosis to produce reusable reclaimed water. The specific process is: the sewage enters the membrane bioreactor (MBR) from the regulating tank (or the secondary sedimentation tank after flocculation). The general COD and other indicators of MBR produced water have reached the discharge standard. However, due to the large amount of dyes used in the printing and dyeing industry, especially the reactive dyes that have been commonly used in recent years, it is difficult to completely remove them. Therefore, after ultrafiltration pretreatment, t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F9/14C02F103/30
CPCC02F1/44C02F3/28C02F2103/30
Inventor 王春浩胡晓宇
Owner TIANJIN MOTIMO MEMBRANE TECH