Simultaneous Phosphate Precipitation and Particle Destabilization Using Aluminium Coagulants of Different Basicity

  • Joachim Fettig
  • Harsha C. Ratnaweera
  • Hallvard Ødegaard

Abstract

Chemical treatment of wastewater was investigated by conducting jar tests with a synthetic testwater. The influence of different variables (pH, ortho-P concentration, particle concentration, hardness, humus concentration) on the competitive reactions of aluminium coagulants with ortho-P and hydroxyl ions, respectively, was studied under controlled conditions. The data were evaluated by assuming that basic aluminium phosphate A11.4PO4(OH)1.2, referred to as Alp and A1(0H)3 are precipitated simultaneously. The ratio A1P/A1T was found to depend on initial pH, initial ortho-P concentration, initial particle concentration and the coagulant’s basicity. In a soft water matrix, the amount of coagulant not consumed by P-precipitation was about as efficient for particle destabilization as an equal amount in the same, but ortho-P free, raw water. In hard water matrices, however, P-precipitation was found to enhance particle destabilization. Co-precipitation of calcium even at pH = 6 was identified as the main reason for this effect. Humus concentrations on the order of 5–10 mg/l can considerably increase the coagulant demand for particle destabilization. A procedure for advanced characterization and evaluation of wastewater with respect to chemical treatment is suggested.

Keywords

Hydrolysis Starch Filtration EDTA Hydroxide 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Literature

  1. [1]
    Stumm, W., Sigg, L.: Z. Wasser Abwasser Forsch. 12 (1979) 73Google Scholar
  2. [2]
    Dentel, S.K., Gossett, J.M.: J. WPCF 59 (1987) 101Google Scholar
  3. [3]
    Dentel. S.K., Gossett, J.M.: J. AWWA 80 (1988) 187Google Scholar
  4. [4]
    Le Bell, J.C., Stenius, P., Axberg, C.: Water Res. 17 (1983) 1073CrossRefGoogle Scholar
  5. [5]
    Sisk, L., Benefield, L., Reed, B.: Sep. Sci k Technol. 22 (1987) 1471Google Scholar
  6. [6]
    Kawamura, S., Hanna, G.P.: Proc. 21st Ind. Waste Conf. Purdue Univ., Lafayette, 1966, p. 381.Google Scholar
  7. [7]
    Shindala, A., Stewart, J.W.: Wat. k Sewage Works 118 (1971) 100Google Scholar
  8. [8]
    Leentvaar, J., Ywema, T.S.J., Roersma, R.E.: Water Res. 13 (1979) 229CrossRefGoogle Scholar
  9. [9]
    Ferguson, J.F., King, T.: J. WPCF 49 (1977) 646Google Scholar
  10. [10]
    Ketchum, L.H., Higgins, T.E.: J. WPCF 51 (1979) 2139Google Scholar
  11. [11]
    Luedecke, C., Hermanowicz, S.W., Jenkins, D.: Wat. Sci. Tech. 21 (1989) 325Google Scholar
  12. [12]
    Jenkins, D., Ferguson, J.F., Menar, A.B.: Water Res. 5 (1971) 369CrossRefGoogle Scholar
  13. [13]
    Galal-Gorchev, H., Stumm, W.: J. Inorg. Nucl. Chem. 25 (1963) 567CrossRefGoogle Scholar
  14. [14]
    Eberhardt, W.A., Nesbitt, J.B.: J. WPCF 40 (1968) 1239Google Scholar
  15. [15]
    Recht, H.L., Ghassemi, M.: Wat. Poll. Contr. Res. Ser. 17010 EKI, US-Dept of the Interior, Washington DC, 1970Google Scholar
  16. [16]
    Hsu, P.H.: Water Res. 10 (1976) 903CrossRefGoogle Scholar
  17. [17]
    Lijklema, L.: Environm. Sci. Tech. 14 (1980) 537CrossRefGoogle Scholar
  18. [18]
    Fettig, J. (1989) [unpublished results]Google Scholar
  19. [19]
    Gillberg, L., Jepsen, S.E., Eger, L.: Report on Chemical Precipitation for HYPRO- projekt, Helsingborg/Copenhagen, 1990Google Scholar
  20. [20]
    Fettig, J., Ratnaweera, H., Thorvaldsen, G.: Status report for HYPRO-projekt, Trondheim, 1989Google Scholar
  21. [21]
    Amirtharajah, A., Mills, K.M.: J. AWWA 74 (1982) 210Google Scholar
  22. [22]
    Dempsey, B.A., Sheu, H., Ahmed, T.M.T., Mentink, J.: J. AWWA 77 (3) (1985) 74Google Scholar
  23. [23]
    Jekel, M.: Water Res. 20 (1986) 1543CrossRefGoogle Scholar
  24. [24]
    Wang, Z.: Proc. 3rd Gothenburg Symp. Springer, Berlin Heidelberg 1988, p. 67.Google Scholar
  25. [25]
    Hsu, P.H.: Water Res. 9 (1975) 1155CrossRefGoogle Scholar
  26. [26]
    Diamadopoulos, E., Benedek, A.: Water Res. 18 (1984) 1175CrossRefGoogle Scholar
  27. [27]
    Frimmel, F.H., Grenz, R., Kordik, E., Dietz, F.: Vom Wasser 72 (1989) 175Google Scholar
  28. [28]
    Link, J., Gilbert, E., Eberle, S.H.: Vom Wasser 72 (1989) 349Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Joachim Fettig
    • 1
  • Harsha C. Ratnaweera
    • 2
  • Hallvard Ødegaard
    • 2
  1. 1.NHL-SINTEFTrondheimNorway
  2. 2.Div. of Hydraulic and Sanit. EngineeringNorwegian Institute of TechnologyTrondheimNorway

Personalised recommendations