The efficiency of using tapioca starch as a natural coagulant on semiconductor wastewater treatment was investigated. The silica content in the wastewater was pH dependent and it was found that the reduction of COD and turbidity occurred at pH between 12 and 14 with measurements below 100 mg/L and 100 NTU respectively. A three - level factorial design experiment in the Response Surface Methodology (RSM) was applied to determine the influence of retention time and dosage of the tapioca starch. The parameters studied were chemical oxygen demand (COD), turbidity and total suspended solids (TSS). The R 2 for turbidity, COD and TSS were 0.92, 0.92 and 0.77 respectively. Results indicate that the dosage of the tapioca starch has a higher influence on COD and turbidity reduction. Tapioca starch as a natural coagulant has shown that the optimum turbidity reduction was 99% at a settling time of 30 minutes with dosage of 0.1 g/L. The COD reduction was achieved at 87% after 60 min of retention time and 0.1 g/L of dosage while higher coagulant dosages reduced the TSS concentration to 10.9 mg/L at retention time between 50 to 60 minutes.
S.-H. You, D.-H. Tseng and G.-L. Guo, “A Case Study on the Wastewater Reclamation and Reuse in the Semiconductor Industry,” Resources, Conservation and Recycling, Vol. 32, No. 1, 2001, pp. 73-81. http://dx.doi.org/10.1016/S0921-3449(00)00096-3
C. Y. Lien and T. C. Liu, “Treatment of Polishing Wastewater from Semiconductor Manufacturer by Dispersed Air Flotation,” Journal of Environmental Engineering, Vol. 132, 2006, pp. 51-57. http://dx.doi.org/10.1061/(ASCE)0733-9372(2006)132:1(51)
S.-C. Hsu, H.-L. Hsieh, C.-P. Chen, C.-M. Tseng, S.-C. Huang, C.-H. Huang, Y.-T. Huang, V. Radashevsky and S.-H. Lin, “Tungsten and Other Heavy Metal Contamination in Aquatic Environments Receiving Wastewater from Semiconductor Manufacturing,” Journal of Hazardous Materials, Vol. 189, 2011, pp. 193-202. http://dx.doi.org/10.1016/j.jhazmat.2011.02.020
C. L. Lai and S. H. Lin, “Electrocoagulation of Chemical Mechanical Polishing (CMP) Wastewater from Semiconductor Fabrication,” Chemical Engineering Journal, Vol. 95, No. 1-3, 2003, pp. 205-211. http://dx.doi.org/10.1016/S1385-8947(03)00106-2
J. Hollingsworth, R. Sierra-Alvarez, M. Zhou, K. L. Ogden and J. A. Field, “Anaerobic Biodegradability and Methanogenic Toxicity of Key Constituents in Copper Chemical Mechanical Planarization Effluents of the Semiconductor Industry,” Chemosphere, Vol. 59, 2005, pp. 1219-1228. http://dx.doi.org/10.1016/j.chemosphere.2004.11.067
S. H. Lin and C. D. Jiang, “Fenton Oxidation and Sequencing Batch Reactor (SBR) Treatments Of High-Strength Semiconductor Wastewater,” Desalination, Vol. 154, No. 2, 2003, pp. 107-116. http://dx.doi.org/10.1016/S0011-9164(03)80011-5
S. H. Lin and C. R. Yang, “Chemical and Physical Treatments of Chemical Mechanical Polishing Wastewater from Semiconductor Fabrication,” Journal of Hazardous Materials, Vol. 108, No. 1-2, 2004, pp. 103-109. http://dx.doi.org/10.1016/j.jhazmat.2004.01.014
C.-T. Wang, W.-L. Chou, L.-S. Chen and S.-Y. Chang, “Silica Particles Settling Characteristics and Removal Performances of Oxide Chemical Mechanical Polishing Wastewater Treated by Electrocoagulation Technology,” Journal of Hazardous Materials, Vol. 161, No. 1, 2009, pp. 344-350. http://dx.doi.org/10.1016/j.jhazmat.2008.03.099
C. J. Huang, B. M. Yang, K. S. Chen, C. C. Chang and C. M. Kao, “Application of Membrane Technology on Semiconductor Wastewater Reclamation: A Pilot-Scale Study,” Desalination, Vol. 278, No. 1-3, 2011, pp. 203-210. http://dx.doi.org/10.1016/j.desal.2011.05.032
F. M. Omar, N. N. N. A. Rahman and A. Ahmad, “COD Reduction in Semiconductor Wastewater by Natural and Commercialized Coagulants using Response Surface Methodology,” Water Air Soil Pollution, Vol. 195, 2008, pp. 345-352. http://dx.doi.org/10.1007/s11270-008-9751-7
H.-D. Ryu, D. Kim and S.-I. Lee, “Application of Struvite Precipitation in Treating Ammonium Nitrogen from Semiconductor Wastewater,” Journal of Hazardous Materials, Vol. 156, No. 1-3, 2008, pp. 163-169. http://dx.doi.org/10.1016/j.jhazmat.2007.12.010
S. H. Lin and C. D. Kiang, “Combined Physical, Chemical and Biological Treatments of Wastewater Containing Organics from a Semiconductor Plant,” Journal of Hazardous Materials, Vol. 97, No. 1-3, 2003, pp. 159-171. http://dx.doi.org/10.1016/S0304-3894(02)00257-1
W.-L. Chou, C.-T. Wang and S.-Y. Chang, “Study of COD and Turbidity Removal from Real Oxide-CMP Wastewater by Iron Electrocoagulation and the Evaluation of Specific energy Consumption,” Journal of Hazardous Materials, Vol. 168, No. 2-3, 2009, pp. 1200-1207. http://dx.doi.org/10.1016/j.jhazmat.2009.02.163
T.-C. Chuang, C. J. Huang and J. C. Liu, “Treatment of Semiconductor Wastewater by Dissolved Air Flotation,” Journal of Environmental Engineering, Vol. 128, No. 10, pp. 974-980. http://dx.doi.org/10.1061/(ASCE)0733-9372(2002)128:10(974)
R. Sheikholeslami, I. S. Al-Mutaz, S. Tan and S. D. Tan, “Some Aspects of Silica Polymerization and Fouling and its Pretreatment By Sodium Aluminate, Lime and Soda Ash,” Desalination, Vol. 150, No. 1, 2002, pp. 85-92. http://dx.doi.org/10.1016/S0011-9164(02)00932-3
M. F. Chang and J. C. Liu, “Precipitation Removal of Fluoride from Semiconductor Wastewater,” Journal of Environmental Engineering, Vol. 133, No. 4, 2007, pp. 419-425. http://dx.doi.org/10.1061/(ASCE)0733-9372(2007)133:4(419)
M. D. G. De Luna, Warmadewanthi and J. C. Liu, “Combined Treatment of Polishing Wastewater and Fluoride-Containing Wastewater from a Semiconductor Manufacturer,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 347, No. 1-3, 2009, pp. 64-68. http://dx.doi.org/10.1016/j.colsurfa.2008.12.006
A. Ndabigengesere and K. S. Narasiah, “Influence of Operating Parameters on Turbidity Removal by Coagulation with Moringa Oleifera Seeds,” Environmental Technology, Vol. 17, No. 10, 1999, pp. 1103-1112. http://dx.doi.org/10.1080/09593331708616479
S. Bhatia, Z. Othman and A. L. Ahmad, “Pretreatment of Palm Oil Mill Effluent (POME) Using Moringa oleifera Seeds as Natural Coagulant,” Journal of Hazardous Materials, Vol. 145, 2007, pp. 120-126. http://dx.doi.org/10.1016/j.jhazmat.2006.11.003
H. A. Gamila, B. E. Hegazy, A. F. Hanan and M. E. Rehab, “Comparative Study on Natural Products Used for Pollutants Removal from Water,” Journal of Applied Sciences Research, Vol. 5, No. 8, 2008, pp. 1020-1029.
J. Beltrán-Heredia and J. Sánchez-Martín, “Improvement of Water Treatment Pilot Plant with Moringa Oleifera Extract as Flocculant Agent,” Environmental Technology, Vol. 30, No. 6, pp. 525-534. http://dx.doi.org/10.1080/09593330902831176
J. Beltrán-Heredia, J. Sánchez-Martín, A. Delgado-Regalado and C. Jurado-Bustos, “Removal of Alizarin Violet 3R (Anthraquinonic Dye) from Aqueous Solutions by Natural Coagulants,” Journal of Hazardous Materials, Vol. 170, No. 1, 2009, pp. 43-50. http://dx.doi.org/10.1016/j.jhazmat.2009.04.131
P. K. Raghuwanshi, M. Mandloi, A. J. Sharma, H. S. Malviya and S. Chaudhari, “Improving Filtrate Quality Using Agrobased Materials as Coagulant Aids,” Water Quality Research Journal Canada, Vol. 37, 2002, pp. 745-756.
M. Mandloi, S. Chaudhari and G. K. Folkard, “Evaluation of Natural Coagulants for Direct Filtration,” Environmental Technology, Vol. 25, 2004, pp. 481-489. http://dx.doi.org/10.1080/09593332508618457
J. Zhang, F. Zhang, Y. Luo and H. Yang, “A Preliminary Study on Cactus as Coagulant in Water Treatment,” Process Biochemistry, Vol. 41, No. 3, 2006, pp. 730-733. http://dx.doi.org/10.1016/j.procbio.2005.08.016
A. Diaz, N. Rincon, A. Escorihuela, N. Fernandez, E. Chacin and C. F. Forster, “A Preliminary Evaluation of Turbidity Removal by Natural Coagulants Indigenous to Venezuela,” Process Biochemistry, Vol. 35, No. 3-4, 1999, pp. 391-395. http://dx.doi.org/10.1016/S0032-9592(99)00085-0
R. Sanghi, B. Bhatttacharya and V. Singh, “Cassia Angustifolia Seed Gum as an Effective Natural Coagulant for Decolourisation of Dye Solutions,” Green Chemistry, Vol. 4, 2002, pp. 252-254. http://dx.doi.org/10.1039/b200067a
M. Sciban, M. Klasnja and J. Stojimirovic, “Investigation of Coagulation Activity of Natural Coagulants from Seeds of Different Leguminose Species,” Acta Periodica Technologica, Vol. 36, 2005, pp. 81-87. http://dx.doi.org/10.2298/APT0536081S
M. Sciban, M. Klasnja, M. Antov and B. Skrbic, “Removal of Water Turbidity by Natural Coagulants Obtained from Chestnut and Acorn,” Bioresource Technology, Vol. 100, No. 24, 2009, pp. 6639-6643. http://dx.doi.org/10.1016/j.biortech.2009.06.047
G.-X. Xing, S.-F. Zhang, B.-Z. Ju and J.-Z. Yang, “Recent Advances in Modified Starch as Flocculant,” The Proceedings of the 3rd International Conference on Functional Molecules, Dalian, 8-11 September 2005.
M. O. Fatehah, M. S. Hossain and T. T. Teng, “Comparative Study on Natural and Commercial Coagulants: Treatment of Semiconductor Wastewater in Sludge Production and Removal of Heavy Metals,” International Journal of Science and Modern Engineering, in press.
APHA, “Standard Methods for the Examination of Water and Wastewater,” 17th Edition, American Public Health Association, Washington DC, 1992.
EQA, “Environmental Quality Act and Its Subsidiary Legislations 1974, Amendment 2006,” MDC Publishers Sdn Bhd, Kuala Lumpur, 2006.
W.-H. Kuan and C.-Y. Hu, “Chemicals Evidences for the Optimal Coagulant Dosage and pH Adjustment of Silica Removal from Chemical Mechanical Polishing (CMP) Wastewater,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 342, 2009, pp. 1-7. http://dx.doi.org/10.1016/j.colsurfa.2009.03.019
J. J. M. Swinkels and Veendam, “Composition and Properties of Commercial Native Starches,” Starch, Vol. 37, No. 1, 1985, pp. 1-5. http://dx.doi.org/10.1002/star.19850370102