Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Struvite Crystallization of Swine Wastewater using Bittern

간수를 이용한 축산폐수의 struvite 결정화

  • Ryu, Hong-Duck (Department of Environmental Engineering, Chungbuk National University) ;
  • Kim, Tae-Su (Department of Environmental Engineering, Chungbuk National University) ;
  • Park, Hyoung-Soon (Department of Environmental Engineering, Chungbuk National University) ;
  • Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
  • 류홍덕 (충북대학교 공과대학 환경공학과) ;
  • 김태수 (충북대학교 공과대학 환경공학과) ;
  • 박형순 (충북대학교 공과대학 환경공학과) ;
  • 이상일 (충북대학교 공과대학 환경공학과)
  • Received : 2006.08.07
  • Accepted : 2006.12.26
  • Published : 2007.01.30
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Abstract

This study goes in for the observation of the characteristics of nitrogen removal from swine wastewater by struvite crystallization. In addition, the struvite formation potential in supernatants after struvite crystallization was investigated. In the study for nitrogen removal by struvite crystallization, the effects of pH and molar ratio of magnesium (Mg) injected using bittern as Mg source were investigated. Also, the potential of struvite formation in the supernatant with amount of Mg added was carefully observed. As the results, the optimum pH in the removal of nitrogen was 8.8 and sludge volume was increased as pH was raised from 7 to 12 under the condition that the molar ratio of $Mg^{2+}$ to ${NH_4}^+$-N to ${PO_4}^{3-}$-P was 1:1:1. An optimum removal efficiency of ammonia-N was observed at 1 molar ratio of Mg to ${NH_4}^+$-N, showing no further increase at over 1 molar ratio and dramatical deterioration at under 1 molar ratio. However, the sludge volume was increased by increasing the molar ratio of Mg. In the experiments for the potential of struvite formation in the supernatants, initial -log([$Mg^{2+}$][${NH_4}^+$][${PO_4}^{3-}$]) value was much lower than $pK_{sp}$ and gradually reached $pK_{sp}$ at 2 days, as the molar ratio of Mg increased over 1.2. At 31 days, -log([$Mg^{2+}$][${NH_4}^+$][${PO_4}^{3-}$]) value was returned to the initial value. In addition, the supernatants had a potential precipitation of hydroxylapatite due to calcium contained in bittern, $K_2Mg(SO_4)_3$ and $K_3Na(SO_4)_2$ resulting from the decrease of sodium and potassium in supernatants formed after struvite crystallization as times go by. Based on the results, it appears that some retention time and proper dosage of Mg may be needed for the prevention of scale in pipe line.

Keywords

Acknowledgement

Supported by : 충북대학교

References

  1. 김만수, 류흥덕, 이상일, 침출수의 Struvite 결정화시 결정원의 주입순서가 미치는 영향, 대한환경공학회지, 24(2), pp. 269-275 (2002)
  2. 류흥덕, 정근욱, 이상일, 축산폐수의 Struvite 전처리가 질산화 과정에 미치는 영향, 대한환경공학회지, 24(10), pp. 1682-1691 (2002a)
  3. 류흥덕, 민경국, 이상일, Struvite 결정화 반응시 결정핵의 유,무에 따른 결정화 효율, 대한환경공학회지, 24(12), pp. 2203-2211 (2002b)
  4. Akihiko, T., Kazuaki, H., Jun, N., Satoshi, T. and Akira, H., Nitrogen Removal Characteristics and Biofilm Analysis of a Membrane-Aerated Biofilm Reactor Applicable to High-Strength Nitrogenous Wastewater Treatment, J. Biosci. Bioeng., 95, pp. 170-178 (2003) https://doi.org/10.1016/S1389-1723(03)80124-X
  5. Battistoni, P., Fava, G., Pavan, P., Musacco, A. and Cecchi, F., Phosphate Removal in Anaerobic Liquors by Struvite Crystallization without Addition of Chemicals: Preview Results, Wat. Res., 31(11), pp. 2925-2929 (1997) https://doi.org/10.1016/S0043-1354(97)00137-1
  6. Battistoni, P., Pavan, P., Cecchi, F. and Mata-Alvarez, J., Phosphate Removal in Real Anaerobic Supernatants: Modelling and Performance of a Fludized Bed Reactor, Wat. Sci. Tech., 38(1), pp. 275-283 (1998)
  7. Battistoni, P., Pavan, P., Prisciandaro, M. and Cecchi, F., Struvite Crystallization: A Feasible and Reliable Way to Fix Phosphorus in Anaerobic Supernatants, Wat. Res., 34(11), pp. 3033-3041 (2000) https://doi.org/10.1016/S0043-1354(00)00045-2
  8. Borgerding, J, Phosphate Deposits in Digestion Systems, WPCF, 44, pp. 813-818 (1972)
  9. Buchanan, J. R., Mote, C. R. and Robinson, R. B., Struvite Control by Chemical Treatment, Amer. Soc. Agri. Eng., 37(4), pp. 1301-1308 (1994) https://doi.org/10.13031/2013.28211
  10. Burns, J. R. and Finlayson, B., Solubility Product of Mangesium Ammonium Phosphate Hexahydrate at Various Temperatures, J. Urology, 128, p. 426 (1982)
  11. Dempsey, B. A., Removal and Reuse of Ammonia and Phosphate by Precipitation of Struvite, 52nd Purdue Industrial Waste Conference Proceedings (1997)
  12. Hwang, H. J. and Choi, E. S., Nutrient Control with Other Sludges in Anaerobic Digestion of BPR Sludge, Wat. Sci. Tech., 38(1), pp. 295-302 (1998)
  13. Luz E. de-Bashan and Yoav Bashan, Recent Advances in Removing Phosphours from Wastewater and Its Future Use as Fertilizer, Wat. Res., 38(19), pp. 4222-4246 (2004) https://doi.org/10.1016/j.watres.2004.07.014
  14. Ohlinger, K. N., Young, T. M. and Schroeder, E. D., Predicting Struvite Formation in Digestion, Wat. Res., 32(12), pp. 3607-3614 (1998) https://doi.org/10.1016/S0043-1354(98)00123-7
  15. Techobanoglous, G. and Burton, F., Wastewater Engineering; Treatment, Disposal and Reuse, New York (1991)
  16. Villaverde, S., Fdz-Polanco, F. and Garcia, P. A., Nitrifying Biofilm Acclimation to Free Ammonia in Submerged Biofilters. Start-Up Influence, Wat. Res., 34, pp. 602-610 (2000) https://doi.org/10.1016/S0043-1354(99)00175-X
  17. Wild, D., Kisliakova, A. and Siegrist, H., Prediction of Recycle Phosphorus Loads from Anaerobic Digestion, Wat. Res., 31(9), pp. 2300-2308 (1997) https://doi.org/10.1016/S0043-1354(97)00059-6
  18. Yang, S. F., Tay, J. H. and Liu, Y., Inhibition of Free Ammonium to the Formation of Aerobic Graniles, Biochem. Eng. J., 17, pp. 41-48 (2004) https://doi.org/10.1016/S1369-703X(03)00122-0