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The Removal of Trace Amount of Hexavalent Chromium and Total Residual Aluminum from Drinking Water by PAN-based Activated Carbon Fiber

Author: LiChong
Tutor: LiShanPing
School: Shandong University
Course: Environmental Engineering
Keywords: PAN-based activated carbon fibers Micro - polluted water Trace Hexavalent Chromium Residual aluminum
CLC: TU991.2
Type: Master's thesis
Year: 2010
Downloads: 95
Quote: 0
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Abstract


With chromium metal and chromium salt of a large number of applications in industry, and indirectly lead to the generation of a large number of wastewater containing chromium and chromium-containing waste, leaching of chromium waste due to improper treatment of wastewater containing chromium and rain increased the possibility of soluble hexavalent chromium into the groundwater and surface water as a drinking water source, which to some extent increase the security risks of drinking water. Aluminum salts Flocculants because of its highly efficient, low-cost, can be widely used in water purification field, in response to the deterioration of water quality, Waterworks tend to enhance the amount of flocculant dosing solutions, and more studies have shown that excessive aluminum intake harm to human body, so the concentration of residual aluminum control in drinking water has a more important significance. To solve the above problem, this paper based activated carbon fibers, polyacrylonitrile (PAN-ACF) with a commercially available coal-based granular activated carbon (GAC) as the main experimental material, comparative analysis of the two materials in the near-neutral conditions (pH6.8 ~ 7.6 the removal) of the total residual aluminum micro-contamination of trace hexavalent chromium and tap water. Use SEM.BET, FT-IR, Boehm titration analysis technology experimental polyacrylonitrile-based activated carbon fiber (PAN-ACF), coal-based granular activated carbon (GAC) to characterize the air is hot and the PAN-ACF oxidation, nitric acid impregnation, hydrogen peroxide impregnation modification treatment of Modification of PAN-ACF of hexavalent chromium adsorption capacity. In order to study the two materials in water purification, total residual impact of the removal of aluminum in tap water, the paper collected the the Jinan region waterworks 2008 water quality data, trend analysis and residual aluminum concentration of two effect on the removal of material in water purification water total residual aluminum and PAN-ACF GAC used in a simple home water purification devices, further analysis of the two materials continued ability to remove water residual aluminum. The study results showed that the PAN-ACF and GAC overall removal of trace Cr (VI) in the near-neutral conditions (pH 6.8-7.6), low (lt; 20%), adsorption kinetics data show that: the two adsorbent adsorption process is more suitable to use the pseudo-first-order kinetics model described; adsorption rate and equilibrium adsorption capacity with the initial concentration increased slightly bigger. Modified by PAN-ACF and its adsorption of hexavalent chromium effect that: enhance the specific surface area (holes increase) is promoted to enhance the adsorption capacity, the impact of changes in the amount of surface acidic functional groups is not dominant factors; affected by the of aluminum salts classes flocculant dosage of Jinan region part of the water treatment plant effluent concentration of total residual aluminum volatile-standard value (GB5749-2006, from less than 5μg / L to 81μg / L, aluminum concentration 0.2mg / L), but the peak concentration is still higher than some developed countries, drinking water standards in aluminum concentration limit (0.050mg / L); tap water anion concentration is relatively high, but has little effect on aluminum removal, its concentration almost no change; PAN-ACF removal of trace amounts of aluminum in the Jinan area tap water, only contact with the 20s when the water has dropped more than aluminum 5μg / L or less, contact by GAC treatment of water like the rest of the aluminum concentration slightly higher than the PAN -ACF treated water samples, but also close to the detection limit of 5μg / L; Simple home water purification devices intermittent influent experiment showed that, relative to the GAC, PAN-ACF lasting total residual aluminum in tap water to addition results; saturated aluminum loading data indicate that as the reaction proceeds, the PAN-the ACF GAC surface position point is quickly saturated lose activity, water particles state aluminum interception PAN-ACF fiber yarn a gap similar to the GAC macroporous, while tap water aluminum removal adsorption entrapping other ion, and part of the inorganic substance, the overall removal efficiency is significantly better than the GAC.

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CLC: > Industrial Technology > Building Science > Municipal Engineering > Water supply project ( on the Water Works ) > Clean Water ( water treatment )
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