Comprehensive processing method for furfural production wastewater

A technology for comprehensive treatment of production wastewater, applied in natural water treatment, heating water/sewage treatment, flotation water/sewage treatment, etc., can solve the problems of large solvent consumption, by-products, secondary pollution, etc., and achieve stable water quality , large amount of wastewater treatment, strong impact resistance

Inactive Publication Date: 2009-07-22
JILIN UNIV
View PDF4 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkali-added neutralization process is simple, but its wastewater discharge does not meet the national discharge standards, and the COD removal rate is not high; direct recovery method can recover acetic acid, but the solvent consumption is large; electrodialysis method can recover acetic acid, but the efficiency of electrodialysis is low, The energy consumption is high, and the treated wastewater cannot be reused or discharged up to standard; the anaerobic filter has a large impact load resistance capacity and a high COD removal rate, but the investment is large and the requirements are high; the recyclable part of the phase transfer method is 30- 40% acetic acid, but the process is complex, it may bring a lot of

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
  • Comprehensive processing method for furfural production wastewater
  • Comprehensive processing method for furfural production wastewater
  • Comprehensive processing method for furfural production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1: Preprocessing

[0030] Add flocculants and activated clay to the raw water, and after flocculation air flotation, sand filtration and activated carbon filtration, the furfural wastewater is light yellow and transparent aqueous solution. The amount of activated carbon used is 100-200mg / L, and the composition of wastewater is shown in Table 2. Pretreatment has almost no effect on acetic acid and COD, but has a great effect on turbidity and color. Use this water as the feed water for the electrodialysis unit.

[0031] Table 2: Water quality composition before and after wastewater pretreatment

[0032]

[0033] Step 2: Click Attach figure 1 , 50L of furfural wastewater (acetic acid concentration 1.45%) after pretreatment is used as electrodialysis dense phase and dilute phase, 0.1mol / L Na 2 SO 4 The aqueous solution is used as the polar water, which is driven by the pump to circulate in the electrodialyzer. The flow rate of the concentrated and dilute phases...

Embodiment 2

[0039] Step 1: Same as Step 1 of Example 1.

[0040] Step 2: 50L of furfural wastewater (acetic acid concentration 1.45%) after pretreatment is used as electrodialysis dense phase and dilute phase, 0.1mol / L Na 2 SO 4 The aqueous solution is used as the polar water, which is driven by the pump to circulate in the electrodialyzer. The flow rate of the concentrated and dilute phases is kept at 25L / min, the flow rate of the polar water is kept at 10L / h, and the tank pressure is controlled at 60V. dense phase wastewater figure 2 The mode circulates, or reaches a certain concentration for batching. The dilute phase is subjected to circular separation and deacidification, and after treatment, the concentration of acetic acid in the dilute phase is reduced to 0.1-0.3% for biochemical treatment.

[0041] Step 3: Dilute Phase Biochemical Treatment

[0042] Get the dilute phase waste water of appropriate acetic acid concentration 0.1~0.3%, operate by embodiment 1 step 4, waste water...

Embodiment 3

[0044] Step 1: Same as Step 1 of Example 1.

[0045] Step 2: Same as step 2 of Example 1.

[0046] Step 3: Same as Step 3 of Example 1.

[0047]Step 4: Dilute Phase Biochemical Treatment

[0048] Take an appropriate amount of dilute-phase wastewater with an acetic acid concentration of 0.1-0.3%, neutralize it with lime milk, and then enter the anaerobic baffle reactor inoculated with bacteria. At 20-35°C, the hydraulic retention time is 2.5-3.5h, The wastewater after anaerobic biodegradation is then aerobically treated to make the wastewater COD cr It can be reduced to below 100mg / L.

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 provides a furfural waste water comprehensive treatment method which aims at the defects of the existing furfural production waste water processing method. The furfural production waste water is fed into a pre-processing unit; then the pre-processed waste water enters an electric dialyzator; the diluted phase effluent of the electric dialyzator enters a biochemical treatment device after meeting the biochemical treatment requirement, and reaches the standard for discharge after the biochemical treatment; and the concentrated phase effluent of the electric dialyzator can reach certain concentration by electrodialysis concentration so as to extract a distillation unit to recycle acetic acid, thus being capable of obtaining the industrial first-grade acetic acid. The concentrated phase effluent of the electric dialyzator can also be free from being concentrated so as to be repeatedly used. The furfural waste water comprehensive treatment method has the advantages that the whole processing technique is characterized not only by large waste water processing amount, strong impact resistance and stable processed water quality, but also by recycling the important chemical industry product, namely, acetic acid, simultaneously when the waste water is processed, thus fully showing the organic combination of electrodialytic technique, biodegradation technique, and extractive distillation technique, and being an effective and economic comprehensive treatment method.

Description

technical field [0001] The invention belongs to a method for treating industrial organic waste water, and in particular provides a comprehensive treatment method for furfural production waste water. Background technique [0002] Furfural is an important organic chemical raw material, which is mainly used in furfuryl alcohol processing, petrochemical, pharmaceutical and other industries. Its main raw materials are corncobs and other pesticide residues. Furfural production is a project that obtains greater economic benefits with relatively small economic investment, and is of great significance to the revitalization of regional economy and the promotion of social development. However, the pollution of furfural production wastewater has become a bottleneck restricting the development of this industry. [0003] The furfural wastewater mainly comes from the wastewater below the tower, which contains a large amount of acetic acid. Every ton of furfural produced produces 30m of wa...

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
IPC IPC(8): C02F9/14C07C53/08C02F1/52C02F1/28C02F1/24C02F1/04C02F1/469C02F101/30C02F103/36
Inventor 林海波季洪海
Owner JILIN UNIV
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap