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Study on the Experiments of Pretreatment Technology of Carbon Fiber Production Wastewater

Author: PanLiang
Tutor: WangSanFan
School: Lanzhou Jiaotong University
Course: Municipal Engineering
Keywords: Carbon fiber Acrylonitrile Iron- carbon micro electrolysis Electrolysis
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 30
Quote: 0
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Abstract


Carbon fiber as an important new composite materials have been widely used in various fields. With China's rapid economic development and industrialization of high-speed process, increasing the demand for carbon fiber. However, restricting carbon fiber production enterprises conservation and waste reduction bottleneck is the effluent discharge standards. Carbon fiber production process more processes will produce a variety of different water quality of wastewater, caused by the complexity of such a large amount of water of wastewater, water quality, pollution is serious and intractable issues such as cost-effective processing of carbon fiber wastewater sewage treatment technology research focus. The test based on the basic data provided by the company Bluestar test simulates two process wastewater treatment the Bluestar carbon fiber production process: a three off a single mixed wastewater (3m3 / h), mainly containing acrylonitrile and a small amount of alcohols, fibers, etc. other substances, an acrylonitrile content of up to 3500mg / L; another as a the spinning waste water (28m3 / h), and containing mainly formic acid and a small amount of fiber, and a formic acid content of up to 7000mg / L. Difficult to deal with especially high concentrations of acrylonitrile wastewater, the high toxicity of such waste water led to poor biodegradability. To this end, the test studies comparing different pretreatment methods to determine an optimal pretreatment to improve the biodegradability of wastewater, to provide the appropriate conditions for the subsequent biological treatment. Two wastewater treatment method system, test the selected research approach: the iron-carbon micro-electrolysis treatment of acrylonitrile wastewater the electrolysis treatment acrylonitrile wastewater, iron-carbon micro electrolysis treatment formic acid wastewater. Through a series of tests to determine the optimum conditions of the process on the two types of wastewater. (1) iron-carbon micro electrolysis treatment acrylonitrile wastewater optimum process conditions: iron and carbon volume ratio of 1:1.5, wastewater pH was adjusted to 3.5 reaction time 105mmin, coagulation and sedimentation interval 15min adding alkali The aeration time settling time 90min, 60min; (2) the electrolysis treatment acrylonitrile wastewater optimum conditions: electrode Ti/SnO2 anode electrode and cathode graphite electrode voltages of 30V, electrolytic time 5h, sodium chloride vote increase the amount of 0.2g / L, plate spacing 6cm; formic acid wastewater (3) iron-carbon micro-electrolysis process optimum conditions: the the iron carbon volume ratio of 1:1, the wastewater pH was adjusted to 3.0, reaction time 30min, mixed interval 15mmin adding alkali condensate precipitation, the aeration time 150min, precipitation 90mmin. After a comprehensive comparison of the effects and the economic performance of each process on the two types of wastewater treatment, the iron-carbon micro electrolysis process. Formic acid wastewater treatment results in optimum conditions, the results show that acrylonitrile wastewater treatment: acrylonitrile removal rates of up to 91.2%, CODC, removal rate could reach 43.4 percent, to 0.92 yuan per ton of waste water; show that: formic acid has been removed, the removal efficiency of CODcr up to 43.78 percent to 1.15 yuan per ton wastewater. The study shows that the economic and technical feasibility of the process and the effect of pretreatment, treated wastewater to meet the requirements of the subsequent biological treatment, the test provides a reference for engineering practice.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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