REMOVAL OF CADMIUM, LEAD AND ORGANIC LOAD FROM WASTEWATER USING BIOGENIC SULFIDE UNDER ANAEROBIC CONDITIONS | ||||
| Misr Journal of Agricultural Engineering | ||||
| Article 23, Volume 29, Issue 4, October 2012, Page 1645-1666 PDF (682.26 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/mjae.2012.101393 | ||||
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| Authors | ||||
| A. H. Abdelrazek1; M. A. Abdel-Hadi2 | ||||
| 1Lecturer of Soil and Water Dep., Fac. of Agr., Suez Canal Univ., Egypt. | ||||
| 2Associate Prof. of Agr. Eng. Dep., Fac. of Agr., Suez Canal Univ., 41522 Ismailia, Egypt. | ||||
| Abstract | ||||
| The influent of the wastewater treatment plant in Ismailia - Egypt loaded with many species of heavy metals, since no separation between industrial and municipal wastewaters because the plant was not designed to remove these metals. The objective of this study was to apply a method able to remove aforementioned metals with biomass concurrently and characterized to be cheap and effective. The removal of heavy metals such as lead, cadmium and minimize the volume of biomass simultaneously was achieved by using bench-scale biogas digester (vertical type) under anaerobic conditions and optimum temperature within the mesophilic condition 38 oC. The treatments of this work carried out on two phases; the first phase was conducted in the absence of gypsum adding (control treatments) and the second was performed with adding gypsum at a dose equal to 5gl-1 (gypsum treatments) with a fermentation time of 20 days. These treatments carried out on the slurry, which was the end residue in the treatment lagoons in Ismailia wastewater treatment plant. This slurry was supplemented with the studied metals. The objective behind adding gypsum was to reduce by native species of sulphate reducing bacteria (SRB) and then produce biogenic sulfide, which used in precipitation of these metals as sulfides and their loss with the wasted biomass. The results showed that the removal efficiency for both Cd and Pb metals increased with decrease the initial concentration of them. Since, the removal levels of both metals for gypsum treatments were >99% at Cd and Pb with initial concentrations not exceed over 120 and 150 mgl-1, respectively. By comparison with control treatments at initial concentrations of Cd and Pb not exceed over 60 and 75 mgl-1, respectively, the removal efficiency reached >99% for Cd and 98.9% for Pb. The pH values for all gypsum treatment were around pH 7. Furthermore, the removal of total solids for the gypsum treatments reached over 84% for the most treatments at the end of the fermentation time. The reaction of Cd and Pb belongs to the second-order kinetic model. It can be concluded that, the adding gypsum under previous conditions as a treatment process can be an effective approach to reuse this kind of wastewater safely in many purposes especially in irrigation. | ||||
| Keywords | ||||
| Wastewater; Anaerobic digestion; Lead; Cadmium; Gypsum; Biogenic sulfide; Kinetics | ||||
| References | ||||
|
Al-Asheh, S. and Duvnjak, Z. (1998). Binary metal sorption by pin bark: study of equilibria and mechanisms. Sep. Sci. Techno. 33: 1303-1329.
Alvarez, M. T.; Crespo, C. and Mattiasson, B. (2007). Precipitation of Zn(II), Cu(II) and Pb(II) at bench-scale using biogenic hydrogen sulfide from the utilization of volatile fatty acids. Chemosphere 66 (9): 1677-1683.
APHA (1980). Standard Methods for the Examination of Water and Wastewater, Method 426 C,15th edition. American Public Health Association, Washington, D.C.
APHA (1992). Standard Methods for the Examination of Water and Wastewater, 18th edition. American Public Health Association, Washington, D.C.
Fischer, E. (1883). Bildung von Methylenblau als Reaction auf Schwefelwasserstoff. Chem. Ber., 26: 2234-2236.
Gammons, C. H. and Frandzen, A. K. (2001). Fate and transport of metals in H2S-rich waters at a treatment wetland. Geochemical Transactions 2: 1-15.
Ho, Y. S.; Ng, J. C. Y. and McKay, G. (2001). Removal of lead (II) from effluents by sorption on peat using second-order kinetics. Separation Science and Technology 36: 241–261.
Jong T. and Parry, D. L. (2003). Removal of sulfate and heavy metals by sulfate reducing bacteria in short-term bench scale upflow anaerobic packed bed reactor runs. Water Research. 37: 3379-3389
Karri, S.; Sierra-Alvarez, R. and Field, J. A. (2006). Toxicity of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in anaerobicsludge, Chemosphere 62: 121-127.
Lagergren, S. (1898). Zur theorie der sogenannten adsorption geloster stoffe. Kungliga Svenska Vetenskapsakademiens. Handlingar, 24 (4): 1-39.
O’Flaherty, V. and Colleran, E. (1998). Effect of sulphate addition on volatile fatty acid and ethanol degradation in an anaerobic hybrid reactor. I: process disturbance and remediation. Bioresource Technology. 68: 101-107.
Oleszkiewicz, J. A. and Sharma, V. K. (1990). Stimulation and inhibition of anaerobic process by heavy metals – a review. Biol. Wastes 31: 45- 67.
Postgate, J. R. (1984). The sulphate reducing bacteria. Cambridge University Press, Cambridge.
Shin, H. S.; Oh, S. E. and Lee, C. Y. (1997). Influence of sulfur compounds and heavy metals on the methanization of tannery wastewater. Water Sci. Techno. 35 (8): 239-245.
Skoog, D. A.; West, D. M. and Holler, F. J. (1992). Fudamentals of Analytical Chemistry. Saunders College Publishing, Fort Worth, USA
Speece, R. E. (1983). Anaerobic biotechnology of industrial wastewaters. Environmental Science and Technology. 17: 416A-427A.
Swanwick, J. D.; Shurben, D. G. and Jackson, S. (1969). A survey of the performance of sewage sludge digesters in Great Britain. J. Water Pollut. Control Fed. 68: 639-653.
Vallee, B. L. and Ulner, D. D. (1972). Biochemical effects of mercury, cadmium, and lead. Annu. Rev. Biochemic. 41: 91-128.
Wase, D. A. J. and Forster, C. F. (1995). Batch nickel removal from aqueous solution by Sphagnum moss peat. Water Res. 29: 1327- 1332. | ||||
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