Browse > Article

Recovery of high quality external carbon sources using crystallization from pretreated excess activated sludge by alkali and ozone  

Seo, In S. (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Hong S. (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Byung G. (한국수자원공사 수자원연구원 상하수도연구소)
Kim, Youn K. (한국수자원공사 수자원연구원 상하수도연구소)
Publication Information
Journal of Korean Society of Water and Wastewater / v.22, no.6, 2008 , pp. 641-646 More about this Journal
Abstract
In this research, recovery of high quality organics from excess activated sludge and its potential as a external carbon sources for BNR process was studied. By simultaneous treatment of alkali and ozone, TSS concentration was reduced by 32%, and RBDCOD fraction was increased by 76.2%, and major constitute of produced organic were acetic acid and propionic acid. Also, nitrogen and phosphorus were greatly solubilized. However, because acid-hydrolyzable phosphorus(AHP) was major part of solubilized phosphorus, $NH_4{^+}-N$ and $PO_4{^3}-P$ concentration were insufficient for effective formation of crystal like as MAP(Magnesium Ammonium Phosphate) and hydroxyapatite. By placing BPR reactor before alkali-ozone treatment reactor, $PO_4{^3}-P$ concentration in pretreated sludge was increased by 1.8 times, and improved potential of phosphorus recovery by crystallization. In experiment of crystallization, hydroxyapatite formation was more easily applied than MAP. By hydroxyapatite formation, $SCOD/PO_4-P$ ratio was greatly increased from 32.7 at control to 141.9 at $Ca^{2+}/PO{_4}^{3-}-P$ mole ratio of 2.4. The results based on this study indicated that the proposed system configuration has potential to reduce the excess sludge production, to recover phosphorus in usable forms as well as utilize organics as a external carbon source in BNR process.
Keywords
Sludge pre-treatment; alkali-ozone; AHP; crystallization; external carbon source;
Citations & Related Records
연도 인용수 순위
  • Reference
1 P. Kampasa, S.A. Parsonsa, P. Pearceb, S. Ledouxb, P. Valec, J. Churchleyc, E. Cartmell(2007) Mechanical sludge disintegration for the production of carbon source for biological nutrient removal, Water Research, 41, pp. 1734-1742   DOI   ScienceOn
2 Wei, Y., Van Houten, R.T., Borger, A.R., Eikelbloom, D.H., Fan, Y.(2003) Minimization of excess sludge production for biological wastewater treatment. Water Research. 37(18), pp. 4453-4467   DOI   ScienceOn
3 Choi, E., Lee, H.S., Lee, J.W., Oa, S.W.(1996) Another carbon source for BNR system. Water Sci. Technol., 34 (1-2), pp. 363-369
4 Boehler, M., Siegrist, H.(2004) Partial ozonation of activated sludge to reduce excess sludge, improve denitrification and control scumming and bulking. Water Sci. Technol. 49 (10), pp. 41-49
5 Sheng-bing He, Gang Xue, Bao-zhen Wang(2006) Activated sludge ozonation to reduce sludge production in membrane bioreactor(MBR), J. of Hazardous Materials, B135, pp. 406-411
6 Park, K.Y., Lee, J.W., Ahn, K.H., Maeng, S.K., Hwang, J.H., Song, K.G.(2004) Ozone disintegration of excess biomass and application to nitrogen removal. Water Environ. Res. 76 (2), pp. 162-167   DOI   ScienceOn
7 Cui, R., Jahng, D. J. (2004) Nitrogen control in AO process with recirculation of solubilized excess sludge, Water Research, 38, pp. 1159-1172   DOI   ScienceOn
8 APHA(2005) Standard Methods for the Examination of Water and Wastewater. In: 21th ed. American Public Health association, American Water Works Association and Water Environment Federation, Washington, DC, USA
9 Liu, Y., Tay, J.H.(2001) Strategy for minimization of excess sludge production from the activated sludge process. Biotechnol. Adv. 19(2), 97-107   DOI   ScienceOn
10 W. Saktaywin, H. Tsuno, H. Nagare, T. Soyama, J. Weerapakkaroon(2005) Advanced sewage treatment process with excess sludge reduction and phosphorus recovery, Water Research, 39, pp. 902-910   DOI   ScienceOn
11 L. Pastor, N. Marti, A. Bouzas, A. Seco(2008) Sewage sludge management for phosphorus recovery as struvite in EBPR wastewater treatment plants, Bioresource Technology, 99, pp. 4817-4824   DOI   ScienceOn
12 환경부(2007) 하수슬러지 관리계획 수립지침
13 Weemaes, M., Grootaerd, H., Simoens, F., Verstraete, W.(2000) Anaerobic digestion of ozonized biosolids. Water Research, 34 (8), pp. 2330-2336   DOI   ScienceOn
14 Muller, J.(2000b) Pretreatment processes for the recycling and reuse of sewage sludge. Water Sci. Technol. 42 (9), pp. 167-174
15 Nishimura, F., Katoh, G., Fujiwara, T.(2001) Improvement and reduction of activated sludge by ozonation and its application to wastewater treatment, Proceedings of 15th Ozone World Congress, I, London