A kind of carbon fiber production wastewater treatment process method

Abstract

The invention relates to a carbon fiber production waste water treating process. According to the process, carbon fiber production waste water is fed into an integrate aerobiotic membrane bioreactor, a co-metabolism substrate and a nutrition salt are added, the pH value in the reactor is controlled to be 6.5-5.5 by adding an alkali, and after aerobiotic bioreactions, discharged water is fed into an ozone contacting tank through a membrane module of the reactor, and flows by itself into a clear water tank after ozone oxidation, wherein the mass of the added co-metabolism substrate is 0.10-0.15 time of the mass of dimethyl sulfoxide in the inlet water, the mass of the added nutrition salt is 0.05-0.15 time of the mass of the dimethyl sulfoxide in the inlet water, temperature is 15-35 DEG C, a dissolved oxygen concentration is 2-4 mg / L, the concentration of sludge is 5-6 g / L, the alkali is sodium bicarbonate, the co-metabolism substrate is one or more of monosaccharide, disaccharide, polysaccharide and waste molasses, the nutrition salt is ammonium phosphate, and a polyvinylidene fluoride hollow fiber curtain type membrane module is adopted. The DMSO concentration of waste water treated by the process can be 1850 mg / L. The DMSO removing rate of the process is near 100%.

Description

Technical field: [0001] The invention relates to a wastewater biochemical treatment process, in particular to a process method for treating carbon fiber production wastewater with a matrix co-metabolism aerobic membrane bioreactor method. Background technique: [0002] Polyacrylonitrile (PAN)-based carbon fiber has an absolute advantage in the production of carbon fiber. Its manufacture is divided into two steps. The first step is to use acrylonitrile (AN) monomer to manufacture PAN precursors. The spinning solvent is mainly dimethyl methylene Sulfone (DMSO), the second step is the pre-oxidation and carbonization of the precursor. Carbon fiber production wastewater is mainly wastewater from washing raw silk, in which the main characteristic pollutant is DMSO, which has poor biodegradability, and the wastewater has a single quality, which is difficult to be directly treated by conventional biological methods. [0003] CN201110240507.0 discloses a biochemical treatment method...

AI Technical Summary

Problems solved by technology

The present invention organically couples the principle of matrix co-metabolism and membrane bioreactor, so that the advantages of the two complement each other. It not only overcomes the problem that membrane bioreactor alone cannot effectively process DMSO, but also overcomes the principle of matrix co-metabolism and other biological treatments. When the method is combined with the treatment of DMSO, the concentration range of DMSO is narrow, the ability to resist DMSO load impact is poor, the effluent has a lot of SS, and it is fine and difficult to settle.

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