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Study on Reusing of Electroplating Wastewater by Nanofiltration (NF)

Author: BaoZiJian
Tutor: YangYuePing
School: Zhejiang University
Course: Environmental Engineering
Keywords: Of plating comprehensive wastewater NF90 NF270 The optimal Concentration polarization Engineering test run
CLC: X781.1
Type: Master's thesis
Year: 2012
Downloads: 91
Quote: 0
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Abstract


With the rapid development of the national economy, China's industrial wastewater emissions increase rapidly, but also brought along a lot of pollution. Various sources of pollution in the electroplating wastewater with its toxic emissions from large, difficult to governance, especially noteworthy. Membrane separation treatment of electroplating wastewater by most mainstream MF RO double membrane. RO membrane susceptible to a variety of pollution factors, and RO membranes for high water requirements, thus limiting the efficiency of the entire film systems handle back plating wastewater, at best, can only reach 50% -65%. Nanofiltration (abbreviated NF) is a membrane technology developed rapidly in recent years. Screening effect and Donnan charge effect separation characteristics, which makes the effect of NF membranes for divalent or multicharged ions trapped better, combined with its strong anti-pollution, in RO membrane system processing based on application of NF membranes The depth of concentrated wastewater, improve overall system reuse rate of about 90%, has certain advantages. The paper will test Chana membrane concentrate treatment of electroplating wastewater feasibility study of concentration polarization, operating pressure and feed concentration on retention performance reveal its own rules, the effect of analog engineering Nanofiltration actual plating wastewater provide guidance, made major findings and conclusions include: the papers were investigated Dow NF270-400-NF90-400 nanofiltration membrane separation characteristics and treatment effects under different operating pressure, influent water quality conditions . Conditions Experimental Study found that there are significant differences, NF90, and NF270 membranes effect Integrated electroplating wastewater NF90 its surface high fixed charge density characteristics compared NF270 exhibit a higher and more stable retention rate of the heavy metal ion, and retention capacity is relatively stable at around 90%, but its water production compared to the NF270 is relatively small, only 1/3 of NF270. And two membrane the influent the pressure 1.6Mpa showed the best ion retention capacity, even in the water conductivity 30000μs/cm, the raw water is concentrated around 7 times the concentration of water production Zn2 ??able to control 1.2mg / L or less, Ni2 concentration can control 0.4mg / L or less, in line with the national emission standards. The paper further NF90/270 nanofiltration membrane concentration polarization analysis In order to investigate the actual electroplating wastewater system, the mass transfer coefficient and the degree of concentration polarization with the membrane surface is investigated under optimum operating pressure 1.6Mpa flow rate changes. The results show that both mass transfer coefficient k increases with the membrane surface velocity and a corresponding decline in the degree of concentration polarization; permeate flux J has some influence on the concentration polarization, when the penetration rate is increased, the mass transfer coefficient k decreased, the increased concentration polarization degree. NF90 relative NF270 subject to the degree of influence of the concentration polarization, even in the case of increasing the surface velocity is also difficult to reduce to below 1.2, while the NF270 membrane element, when the film surface velocity reaches 0.20m / s concentration The polarization can be reduced to a relatively small extent, suitable for engineering is actually running. 3 Finally, the actual project using the NF270 membrane elements run test in the influent to 16000μs/cm, pressure 1.6MPa, NF product water conductivity stability below 7000μs/cm the total concentrate that NF concentrate The conductivity stability in 33000μs/cm to 42000μs/cm the NF system recovery rate of about 75%, RO / NF combination system can achieve a 95% recovery rate to meet back to the design requirements of water quality and quantity.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Chemical industry,waste disposal and comprehensive utilization > Inorganic Chemical Industry > Electroplating,electrolysis industry
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