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Study on the Optimum Preparation Process Conditions of Iron Oxide Coated Sand

Author: HuangHui
Tutor: LiDongMei
School: Guangdong University of Technology
Course: Municipal Engineering
Keywords: Iron oxide Nano Quartz Sand Optimization of Process Conditions SEM morphology Dynamic filtering
CLC: TU991.2
Type: Master's thesis
Year: 2011
Downloads: 54
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Abstract

As raw materials to the the waterworks ordinary quartz sand, FeCl3 modifier, the surface of the load, the adhesion strength and the the static adsorption rate evaluation by orthogonal test, continuity test method for preparation of iron oxide modified quartz sand (Iron Oxide Coated Sand, IOCS) optimization program: not stirred under the conditions of 110 ° C drying, calcination time t ≥ 3h, calcination temperature T ≈ 300 ° C, with RQS of FeCl3 dosing than C = 0.17 mL / g RQS NaOH and RQS dosing than C1 = 0.3 mL / g RQS compared with the low-temperature alkaline deposition (T lt; 110 ℃) the IOCS-0 prepared IOCS-0 high temperature calcination (T ≈ 300 ° C for about ), the obtained novel IOCS-1 loading is increased by 3-5 times, the desorption rate is lower than 90%. Using nano materials (such as nano-SiO2, nano Fe2O3) or high porosity of activated carbon instead of ordinary FeCl3 modifiers preparation of nano-modified quartz sand. The test results show that: by ultrasonic dispersion of SiO2 modifier and the preparation of high-temperature conditions, contribute to the nano-SiO2-coated quartz sand; the nano Fe2O3 modified quartz sand nano-IOCS should adopt a water bath heated under continuous stirring, the first vote plus dissolving agents HCl and then precipitating agent NaOH dosing method obtained the double-D-nano-the IOCS (IOCS for the carrier) are obvious effect on the adsorption of organic matter removal, the removal rate of 35.45%; single-layer nano-SiO2 modified quartz sand (Single nano SiO2 Coated Sand, S-nano-SICS) and single layer the S-nano-the IOCS (RQS carrier), and the double-D-nano-SICS (IOCS for the carrier), humic acid raw water by shock adsorption UV254 increased rather than decreased, the removal rate are negative. SEM scanning electron micrograph and analytical X-ray spectroscopy (EDS) results show: the main component of the of the IOCS filter surface coverings: Fe304 (magnetite) and α-FeOOH (goethite) the IOCS-0 and IOCS -1 surface mainly α-Fe2O3 (hematite), the IOCS surface of nano-high iron oxide FeO3. α-FeOOH (goethite) directly affects the amount of load in the IOCS surface modifier in the IOCS surface adhesion strength. By analysis of the SEM photograph, the BET specific surface area results and the test results of the nano-modified, drawn: changing the calcination temperature T, can obtain the same size as the pores of the pollution particles the IOCS (pore size of about 5 to 40 μm) to be adsorbed and removed to the urea as precipitating agent, the obtained N-nano-the IOCS (pore size of about 30 to 70 μm) pores larger when using nano Fe203 modifier nanoscale porosity nano-IOCS (pore size of about 0.2 to 1 μm) can be obtained. New water treatment technology the small test test device, attached to the ideal situation of ordinary IOCS dynamic filtration test, explore the regenerative capacity optimization the performance of the preparation conditions obtained IOCS the filter backwash. Dynamic filtration test results show that: IOCS filter media filtration column for the IOCS with activated carbon, the ability to remove turbidity than RQS filter filtration column average high 1 ~ 2NTU, average removal of from UV254 more than 0.1 to 2cm-1. Through the air-water backwash make inorganic kaolin raw water filtration cycle after each filter column filter interception capability fully return to its original state of the filter media. Help off agent combination trials recoil with NaOH using gas-water backwash method, you can more effectively renewable IOCS filter, followed by water recoil with NaOH to help de-agent combination.

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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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