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

Method for strengthening biological denitrification of printing and dyeing wastewater by magnetic separation of zero-valent iron

A technology for printing and dyeing wastewater, biological denitrification, applied in chemical instruments and methods, biological water/sewage treatment, water/sewage treatment, etc., can solve problems such as increasing the operating burden of the treatment plant, increasing the cost of wastewater treatment, and secondary environmental pollution. , to achieve the effect of enhancing the ability to resist changes in the external environment, reducing operating and processing costs, and reducing dosage

Inactive Publication Date: 2018-11-23
DONGHUA UNIV
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding a large amount of zero-valent iron will greatly increase the treatment cost of wastewater and increase the operating burden of the treatment plant. At the same time, a large amount of zero-valent iron will not only cause waste of resources but also cause secondary pollution to the environment. Iron needs to be recycled

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for strengthening biological denitrification of printing and dyeing wastewater by magnetic separation of zero-valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for strengthening the biological denitrification of printing and dyeing wastewater by zero-valent ferromagnetic separation, comprising the following steps:

[0027] Step 1) The treatment capacity of a printing and dyeing wastewater treatment plant is 50000m 3 / d, using hydrolysis acidification-AO biochemical treatment process to remove organic matter in wastewater. Two sets of process reactors A and B identical to those of the printing and dyeing wastewater treatment plant were constructed in the laboratory, and the activated sludge of the treatment plant was inoculated with the same concentration, and the treatment capacity was 10m 3 / d, the influent COD concentration is 450-550mg / L, the ammonia nitrogen concentration is 50-60mg / L, the total nitrogen concentration is 65-75mg / L, and the sludge reflux ratio is 50%. After treatment, the effluent COD concentration of the two groups of reactors is 150-180mg / L, the ammonia nitrogen concentration is 17-22mg / L, and t...

Embodiment 2

[0032] A method for strengthening the biological denitrification of printing and dyeing wastewater by zero-valent ferromagnetic separation, comprising the following steps:

[0033] Step 1) For a printing and dyeing enterprise in Henan, the wastewater discharged includes printing, dyeing, scouring, and desizing wastewater, and the volume of mixed wastewater is 10,000m 3 / d, using hydrolysis acidification-AO biochemical treatment process to remove organic matter in wastewater. Two sets of process reactors A and B identical to those of the printing and dyeing wastewater treatment plant were constructed in the laboratory, and the activated sludge of the treatment plant was inoculated with the same concentration, and the treatment capacity was 10m 3 / d, the influent COD concentration is 350-420mg / L, the ammonia nitrogen concentration is 35-50mg / L, the total nitrogen concentration is 45-55mg / L, and the sludge reflux ratio is 100%. After treatment, the effluent COD concentration of t...

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

PropertyMeasurementUnit
recovery rateaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for strengthening biological denitrification of printing and dyeing wastewater by magnetic separation of zero-valent iron, the method is characterized in that the printing and dyeing wastewater is discharged into a biochemical reaction section after being subjected to coagulation and sedimentation treatment in sequence, and then is discharged into a secondary sedimentation tank for sedimentation, a proper amount of zero-valent iron is added into the biochemical reaction section to strengthen the efficiency of biological treatment of ammonia nitrogen and total nitrogen in the wastewater; the activated sludge part containing zero-valent iron in the secondary sedimentation tank is returned, and the remaining activated sludge enters into a high-gradient magnetic separator for magnetic separation to recover zero-valent iron, the magnetically separated sludge and the coagulated and precipitated physical-chemical sludge are discharged into the concentration tank together for concentration and then are dewatered by a plate-and-frame filter press, the sludge is transported outside for disposal, and the supernatant and dewatering liquid are discharged into the regulating tank; zero-valent iron obtained by magnetic separation is re-added into the biochemical reaction section, and new zero-valent iron is added to ensure the effective concentration of iron in the biochemical reaction section at the same time. The method has advantages of simple process and lower cost, and is easy to be engineered, providing a feasible method for printing and dyeing wastewater treatment and resources recovery.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for strengthening the biological denitrification of printing and dyeing wastewater through zero-valent ferromagnetic separation. Background technique [0002] The textile industry is a traditional industry with a long history in my country. It is also a pillar industry of the national economy and an important livelihood industry. It has strong international competitiveness. The printing and dyeing industry is an important part of the textile industry. It is a key industry to increase the added value of products and improve product quality. However, there are also problems such as large energy consumption, high water consumption, and large sewage discharge. According to incomplete statistics, the total amount of printing and dyeing wastewater discharged in my country every day is as high as 4×106m 3 , accounting for about 1 / 3 of the entire in...

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): C02F9/14
CPCC02F1/488C02F1/52C02F1/56C02F3/1215C02F3/28C02F9/00
Inventor 陈红方庭玕薛罡李响张艾李贤英王晓暖汪钟凝姜明吉张权于鑫沈玉叶
Owner DONGHUA UNIV