Method of eliminating methane chloride biological toxicity in waste water by resin absorption method

A methane chloride and resin adsorption technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sewage treatment, etc., can solve the problems of large pore distribution, high price, and difficulty in reaching water standards, and achieve the elimination of biological toxicity , Low operating cost and easy operation

Active Publication Date: 2007-10-24
NANJING UNIV +1
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although activated carbon is cheap, it is difficult to regenerate, and it is not economically feasible to treat high-concentration industrial wastewater.
Activated carbon fiber is a high-efficiency adsorbent developed in recent years. It has the advantages of fast adsorption speed and easy regeneration. However, due to its high price and small adsorption capacity, it is mainly used in gas phase adsorption and purification of drinking water.
[0005] The resin adsorption method highlights many advantages in the treatment of organic chemical wastewater, but for volatile substances such as methane chloride, the treatment effect of general resin is difficult to meet the needs
General styrene-based resins, such as XAD-4, XAD-7, and XAD-8 of Rohm and Haas Company in the United States, have large pore distribution (average pore 10-15nm), and it is difficult to capture methane chloride with small molecules. Difficult to meet water standards
Acrylic resins are difficult to engineer because of their low resin strength

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

[0019] Put 50 mL of NDA-150 resin into a jacketed glass adsorption column (Φ30×250 mm). Take 300mL of light yellow waste water for filtration pretreatment. The concentration of methylene chloride in the waste water is 1000 mg / L, the concentration of chloroform is 80 mg / L, and the concentration of carbon tetrachloride is 50 mg / L. The adsorption temperature is room temperature 20°C. The flow rate per hour passes through the NDA-150 resin bed, and the processing capacity is 3000mL / batch. The adsorbed water is colorless, the concentration of dichloromethane drops below 1mg / L, the concentration of chloroform drops below 0.1mg / L, and the concentration of carbon tetrachloride drops below 0.03mg / L.

[0020] The adsorbed NDA-150 resin was stripped and regenerated with water vapor at 130°C, the stripping time was 90 minutes, and the volume of the desorption liquid was 100ml. The resin can recover its adsorption capacity after desorption regeneration.

Embodiment 2

[0022] The NDA-150 resin in Example 1 was replaced by Amberlite XAD-2 resin, Amberlite XAD-4 resin, Diaion HP2MG resin respectively, and other operating conditions remained unchanged, and the wastewater treatment capacity of each batch was less than 1500mL. The concentration of dichloromethane in the adsorbed water is about 10 mg / L, the concentration of chloroform is 0.5-1 mg / L, and the concentration of carbon tetrachloride is 0.3-1 mg / L. The treatment effect is obviously inferior to that of Example 1.

Embodiment 3

[0024] Put 10 mL (about 7.5 g) of NDA-16 (produced by Jiangsu Nanda God Environmental Protection Technology Co., Ltd.) adsorption resin into a jacketed glass adsorption column (Φ12×160 mm). Wastewater contains 2000mg / L of dichloromethane, 40mg / L of chloroform, and 20mg / L of carbon tetrachloride. After filtering, pass it through the resin bed at a flow rate of 30mL / h at room temperature, and the treatment capacity is 300mL / batch . After being adsorbed by resin, the effluent is colorless and transparent, dichloromethane drops to 0.5-2 mg, chloroform drops to 0.01-0.1 mg / L, and carbon tetrachloride drops below 0.1 mg / L.

[0025] Use 20mL of ethanol at a temperature of 35°C to pass through the resin bed in parallel at a flow rate of 15mL / h for desorption. The desorbed high-concentration methane chloride ethanol solution is rectified to obtain pure methane chloride, and the recovered ethanol is used as a desorbing agent for the next batch. The adsorption resin can fully restore 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

No PUM Login to view more

Abstract

The invention discloses a releasing method of biological toxicity of methane chloride in the waste water through resin adsorbing method, which comprises the following steps: predisposing waste water with methane chloride to remove suspension; passing the suspension through adsorption tower with high specific surface area and large-hole adsorbing resin under 0-40 deg. c and flow speed at 0. 5-10BV/h; making methane chloride adsorbed on the large-hole resin to obtain the transparent outlet water; discharging the water directly due to reaching the discharge standard; regenerating the adsorption resin through steam, carbinol or alcohol solution; disposing the high-density desorption liquid collectively or returning to the manufacturing procedure of methane chloride directly to fraction; obtaining the product.

Description

technical field [0001] The invention relates to the treatment of methane chloride waste water in the downstream industry of the chlor-alkali industry. Specifically, it uses resin to enrich, separate and recycle monochloromethane, dichloromethane, trichloromethane and carbon tetrachloride in the waste water, thereby removing Methane chloride in wastewater. Background technique [0002] Methane chloride is an important biorefractory organochlorine compound, which is extremely toxic to organisms, has stable chemical properties, and can exist stably in the natural environment for a long time. Industrial wastewater mixed with methane chloride cannot be effectively degraded during the biochemical treatment process, and the effluent of methane chloride is difficult to meet the standard and accumulates in the natural environment, which will cause long-term harm to the natural environment. If the concentration of methane chloride is too high, its biological toxicity will impact the ...

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): C02F1/28C02F1/58
Inventor 李爱民邓丛林范俊龙超刘福强陆朝阳陈金龙张全兴
Owner NANJING 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