Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Technology for processing comprehensive waste water from acrylonitrile and acrylic fibers production

A technology that integrates waste water and treatment processes, applied in the field of environmental engineering, can solve the problems of difficult actual operation, easy pollution of membrane systems, high investment and operation costs, etc., and achieve the effect of improving biological treatment performance and high removal rate of total sulfur

Active Publication Date: 2011-09-21
博瑞德环境集团股份有限公司
View PDF11 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Invention patent CN200710176576.3 has improved it, using homogenization and sedimentation to remove suspended solids, adding iron, magnesium, calcium and other ions to reduce the microbial toxicity of wastewater, but this technology still has disadvantages such as high operating costs and large sludge production. Moreover, a large amount of sulfate radicals in the waste water are easy to form precipitates with the added metal ions, and compete with more biologically toxic substances such as cyanide, nitrile, amine, etc., resulting in a large dosage of chemicals. Furthermore, these toxic substances have not been removed from the Therefore, the toxic effect on wastewater has not been completely solved, but it has increased the cost and difficulty of wastewater treatment
[0006] Chinese patent CN99112488.X is coagulation sedimentation - anaerobic digestion - anoxic - aerobic - sand filter - activated carbon process, while Chinese CN00129461.X transforms coagulation sedimentation - anaerobic - aerobic - biochar tower process into air flotation -Aeration-Sedimentation-Acid production-Biological desulfurization-Methanation-Anoxic-Aerobic, these two patents are based on biological treatment technology, but the treatment process is long, the actual operation is difficult, and often need supplementary measures to ensure that the wastewater Discharge
[0007] Chinese patent CN200810224878.8 uses double-membrane technology to treat acrylic wastewater. Although it can ensure stable effluent quality, it has defects such as easy pollution of the membrane system, short cleaning cycle, and high investment and operation costs, and does not solve the problem of concentrated water treatment.
[0008] Chinese patent CN200810244778.1 proposes dynamic adsorption of magnetic resin for effluent after biochemical treatment, but the modified technology has resin failure and regeneration, difficult operation, high cost, and no detailed method for biological treatment technology
[0009] Chinese patent CN201010144936.3 provides an electrocatalytic aerobic treatment process, which has the disadvantages of high equipment investment and operating costs
[0010] Chinese patent CN200910087863.6 provides a combination of facultative, aerobic and coagulation-sedimentation treatment process. This technology has not yet effectively separated or removed biological toxic substances, and coagulation-sedimentation produces a large amount of mud
[0011] To sum up, the difficulty of biological treatment of acrylic industrial wastewater is that polymers that are difficult to settle naturally are easy to wrap microorganisms after entering the biochemical system, which affects the biochemical effect; after sulfite aeration makes the wastewater weakly acidic, affecting the normal operation of the anaerobic system; At the same time, the content of organic amine and ammonia nitrogen in wastewater is high, causing nitrogen pollution

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
  • Technology for processing comprehensive waste water from acrylonitrile and acrylic fibers production
  • Technology for processing comprehensive waste water from acrylonitrile and acrylic fibers production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]The comprehensive wastewater from the production of acrylonitrile and acrylic fiber in Nanjing, Jiangsu Province is firstly filtered through the grid and then placed in the regulating pool for standby. After testing, the pH of the pond effluent was adjusted to 7.2, in which COD was 6,100 mg / L and total nitrogen was 450 mg / L.

[0038] The comprehensive wastewater from the production of acrylonitrile and acrylic fiber first enters the pre-aeration reaction tank, reacts with the reflux acidification liquid and reflux sludge, and then enters the hydrolysis acidification reaction tank. The aeration intensity (DO value) is 0.5 mg / L.

[0039] The wastewater after pre-aeration treatment enters the hydrolytic acidification tank for hydrolytic acidification treatment. Phosphorus-containing nutrients (sodium dihydrogen phosphate) are added to the hydrolytic acidification tank, and the waste water is reduced under the action of sulfate-reducing bacteria naturally existing in the slud...

Embodiment 2

[0046] The comprehensive waste water from the production of acrylonitrile and acrylic fiber in Wuxi, Jiangsu Province was first filtered through the grid and then placed in the regulating pool for standby. After testing, the pH of the pond effluent was adjusted to 6.8, with COD 5,890mg / L and total nitrogen 553mg / L.

[0047] The comprehensive wastewater from acrylonitrile and acrylic fiber production first enters the pre-aeration reaction tank, reacts with reflux acidification liquid and reflux sludge, and then enters the hydrolysis acidification reaction tank. The aeration intensity (DO value) is 1.0 mg / L.

[0048] The wastewater after pre-aeration treatment enters the hydrolytic acidification tank for hydrolytic acidification treatment. Phosphorus-containing nutrients (disodium hydrogen phosphate) are added to the hydrolytic acidification tank, and the wastewater SO 4 2- converted to H 2 S, part of the acidification solution is returned to the pre-aeration reaction tank, a...

Embodiment 3

[0055] The comprehensive wastewater from the production of acrylonitrile and acrylic fiber in Nanjing, Jiangsu Province is firstly filtered through the grid and then placed in the regulating pool for standby. After testing, the pH of the pond effluent was adjusted to 7.8, with COD 4,500mg / L and total nitrogen 380mg / L.

[0056] The comprehensive wastewater from acrylonitrile and acrylic fiber production first enters the pre-aeration reaction tank, reacts with the reflux acidification liquid and the reflux sludge, and then enters the hydrolysis acidification reaction tank. The aeration intensity (DO value) is 0.8 mg / L.

[0057] The wastewater after pre-aeration treatment enters the hydrolytic acidification tank for hydrolytic acidification treatment. Phosphorus-containing nutrients (dipotassium hydrogen phosphate) are added to the hydrolytic acidification tank, and the waste water SO 4 2- converted to H 2 S, part of the acidification solution is returned to the pre-aeration r...

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 relates to a technology for processing comprehensive chemical waste water from acrylonitrile and acrylic fibers production and is directed to the field of environment engineering technology. According to the invention, an aeration reaction, a biology hydrolysis acidification, a denitrification nitrogen removal and an aerobic biological treatment are adopted. The waste water is classified into C, N and S grade. The toxicity problem for microbes caused by the waste water is solved; the biological treatment capability and waste water processing effect are improved. The technology is characterized by simple and reasonable process flow. The operation cost is reduced. The technology is suited for industrial application and biology processing of high sulfur high nitrogen organic waste water of the same kind.

Description

technical field [0001] The invention relates to a comprehensive wastewater treatment process for the production of acrylonitrile and acrylic fiber, which belongs to the technical field of environmental engineering. The method of the invention includes grid filtration, pre-aeration, hydrolytic acidification desulfurization, anaerobic decarburization, aerobic denitrification and other biological treatment processes, and is suitable for biological treatment of high-sulfur, high-nitrogen and high-COD wastewater of the same kind. Background technique [0002] The production of acrylic fiber in our country's existing technology mainly includes four production processes of sodium thiocyanate one-step method, sodium thiocyanate two-step method, wet method and dry method, but its monomers are all acrylonitrile, usually produced by propylene ammoxidation method Acrylonitrile is obtained. The solvents used in the above process mainly include sodium thiocyanate (NaSCN), dimethylformami...

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): C02F9/14C02F103/36
Inventor 严月根叶国祥
Owner 博瑞德环境集团股份有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com