Aqueous zinc removal by calcium fluoride sludge
Zinc (Zn) contamination is of environmental concern due to its effect on human health. The purpose of this study was to investigate the use of Calcium Fluoride (CaF2) sludge has been used to investigate its feasibility of using to remove Zn from aqueous solution. The CaF2 sludge produced by AFPD Pte...
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| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2008
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| Online Access: | http://hdl.handle.net/10356/14140 |
| _version_ | 1811682681265586176 |
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| author | Chua, Viny Xiao Wei. |
| author2 | Chui, Peng Cheong |
| author_facet | Chui, Peng Cheong Chua, Viny Xiao Wei. |
| author_sort | Chua, Viny Xiao Wei. |
| collection | NTU |
| description | Zinc (Zn) contamination is of environmental concern due to its effect on human health. The purpose of this study was to investigate the use of Calcium Fluoride (CaF2) sludge has been used to investigate its feasibility of using to remove Zn from aqueous solution. The CaF2 sludge produced by AFPD Pte Ltd, one of the world’s largest TFT LCD manufacturing plants (based in Singapore), contains apatite, which have high selectivity for certain toxic metals. The major parameters controlling aqueous Zn removal, viz. initial metal ion concentration, solution pH, ionic strength and metal kinetics were evaluated using batch experiments. Result demonstrated that the capacity of aqueous Zn immobilization by CaF2 was high at low initial Zn aqueous solution. Zn removal efficiency by CaF2 generally increased with decreasing ionic strength. In the pH-controlled study, it was found that removal of Zn is dependent on the cation exchange capacity (CEC) of CaF2. It was also found that the desorption level of Zn from CaF2 sludge is high especially in the acidic condition (pH < 2.88). This implies that Zn laden will have to be stabilized before being disposed into landfill since the maximum allowable limit for zinc in discharged water is 5 mg/L. |
| first_indexed | 2024-10-01T04:00:42Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/14140 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:00:42Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | ntu-10356/141402023-03-03T17:03:27Z Aqueous zinc removal by calcium fluoride sludge Chua, Viny Xiao Wei. Chui, Peng Cheong School of Civil and Environmental Engineering DRNTU::Engineering::Environmental engineering::Waste management Zinc (Zn) contamination is of environmental concern due to its effect on human health. The purpose of this study was to investigate the use of Calcium Fluoride (CaF2) sludge has been used to investigate its feasibility of using to remove Zn from aqueous solution. The CaF2 sludge produced by AFPD Pte Ltd, one of the world’s largest TFT LCD manufacturing plants (based in Singapore), contains apatite, which have high selectivity for certain toxic metals. The major parameters controlling aqueous Zn removal, viz. initial metal ion concentration, solution pH, ionic strength and metal kinetics were evaluated using batch experiments. Result demonstrated that the capacity of aqueous Zn immobilization by CaF2 was high at low initial Zn aqueous solution. Zn removal efficiency by CaF2 generally increased with decreasing ionic strength. In the pH-controlled study, it was found that removal of Zn is dependent on the cation exchange capacity (CEC) of CaF2. It was also found that the desorption level of Zn from CaF2 sludge is high especially in the acidic condition (pH < 2.88). This implies that Zn laden will have to be stabilized before being disposed into landfill since the maximum allowable limit for zinc in discharged water is 5 mg/L. Bachelor of Engineering 2008-10-29T08:18:06Z 2008-10-29T08:18:06Z 2007 2007 Final Year Project (FYP) http://hdl.handle.net/10356/14140 en 57 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Environmental engineering::Waste management Chua, Viny Xiao Wei. Aqueous zinc removal by calcium fluoride sludge |
| title | Aqueous zinc removal by calcium fluoride sludge |
| title_full | Aqueous zinc removal by calcium fluoride sludge |
| title_fullStr | Aqueous zinc removal by calcium fluoride sludge |
| title_full_unstemmed | Aqueous zinc removal by calcium fluoride sludge |
| title_short | Aqueous zinc removal by calcium fluoride sludge |
| title_sort | aqueous zinc removal by calcium fluoride sludge |
| topic | DRNTU::Engineering::Environmental engineering::Waste management |
| url | http://hdl.handle.net/10356/14140 |
| work_keys_str_mv | AT chuavinyxiaowei aqueouszincremovalbycalciumfluoridesludge |