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Application of carbon-fiber biofilm carrier in wastewater treatment

A biofilm carrier, wastewater treatment technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as poor biodegradability, ammonia nitrogen pollution, etc. Small footprint, simple regeneration method, and good biocompatibility

Inactive Publication Date: 2009-09-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acrylic fiber wastewater mainly has the following three characteristics: first, it contains high molecular polymers that are difficult to biodegrade and natural sedimentation, and its biodegradability is poor; second, sulfuric acid and sulfurous acid are produced during the polymer preparation process, resulting in high concentrations of sulfate and sulfite; the third is that the wastewater contains organic nitrogen and ammonia nitrogen, causing ammonia nitrogen pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Wet-spun polyacrylonitrile copolymer fiber (3K with 3000 pore number per filament, fineness 1.1 denier (1.22dtex), containing more than 90% of acrylonitrile monomer component and produced by the commercially available British courtaulds company, was selected from the The composition (by mass ratio) is: acrylonitrile 96, methylene succinic acid 1, methyl acrylate 3), which were treated in four pre-oxidation furnaces at 215 ° C, 240 ° C, 260 ° C, and 280 ° C in air, and the residence time was 7.5, 15, 15, 15minn respectively, the total pre-oxidation time is 52.5min, after continuous low and high temperature carbonization treatment, the temperature during low temperature carbonization is 300~700℃, the heating rate is 300℃ per minute, and the high temperature carbonization temperature is 1350℃ , and kept the temperature for 2 min to obtain carbon fiber. The obtained carbon fibers were subjected to surface oxidation treatment in the air at a temperature of 300° C. for 30 min...

Embodiment 2

[0027]The preparation of PAN-based carbon fiber is the same as that of Example 1, and the surface treatment at 150°C is the same as that of Example 1. The prepared modified PAN-based carbon fiber has an equilibrium moisture content of 2.3% and a surface contact angle of 108°. The experimental device and experimental conditions were the same as those of Example 1. The stationary sulfate-reducing bacteria reached equilibrium in 20 hours, and the dry weight was 1.5 g / g carrier. The sessile methanogens reached equilibrium at 28 h with a dry weight of 1.1 g / g carrier. The sessile aerobic nitrifying bacteria reached equilibrium in 10 h, with a dry weight of 2.2 g / g carrier. The experimental effluent concentration is COD4 2- 3 -N75%, SO 4 2- Removal rate>80%.

Embodiment 3

[0029] The preparation of PAN-based carbon fiber is the same as that of Example 1, and the surface treatment at 50°C is the same as that of Example 1. The prepared modified PAN-based carbon fiber has an equilibrium moisture content of 1.0% and a surface contact angle of 50°. The experimental device and experimental conditions were the same as those of Example 1. The stationary sulfate-reducing bacteria reached equilibrium in 12 hours, and the dry weight was 2.1 g / g carrier. The sessile methanogens reached equilibrium at 18 h with a dry weight of 1.7 g / g carrier. The sessile aerobic nitrifying bacteria reached equilibrium in 18h, with a dry weight of 1.4g / g carrier. The experimental effluent concentration is COD4 2- 3 -N80%, SO 4 2- Removal rate>90%

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Abstract

The invention relates to application of functional biological carbon fiber. The carbon fiber of which the surface contact angle is 50 to 180 degrees and the range of equilibrium moisture content is 1.0 to 5.9 percent is adopted as a biofilm carrier. The biofilm carrier can rapidly fix nitrobacteria, denitrifying bacteria, sulfatereducting bacteria and anaerobic methanogens. Acrylic and other high-concentration production wastewater is treated mainly through two-phase anaerobic / aerobic nitration and other processes, so that sulfate, COD, BOD, ammonia nitrogen and nitrate nitrogen can be effectively reduced and removed. In addition, a regeneration method of the biofilm carrier is simple and easy to apply and free from secondary pollution. The invention is particularly applicable to the biological treatment of acrylic wastewater and other industrial wastewater with high sulfate, high COD, low carbon-sulfur ratio and substances difficult to biodegrade.

Description

Technical field: [0001] The invention belongs to the technical field of wastewater treatment, and particularly relates to the application of a novel high-efficiency biofilm carrier carbon fiber for treating sulfate, high COD, low-carbon-sulfur ratio and wastewater containing refractory biodegradable substances. Background technique: [0002] In recent years, two-phase anaerobic treatment has been widely used as an advanced treatment technology for the treatment of sulfate-containing and low-carbon-sulfur ratio wastewater, and continuous exploration and improvement have been carried out in the process. However, due to the slow proliferation of anaerobic bacteria, poor ability to adapt to the environment, and long start-up time of the reactor, the application of this technology in sewage treatment is limited. [0003] Biofilm sewage treatment has become one of the main methods of sewage treatment due to its high treatment efficiency, small footprint, strong adaptability to cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/52
Inventor 刘杰宋晖马兆昆梁节英
Owner BEIJING UNIV OF CHEM TECH
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