Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Recovery of high quality external carbon sources using crystallization from pretreated excess activated sludge by alkali and ozone

알칼리-오존 동시 전처리된 잉여슬러지로부터 결정화를 이용한 고품질 외부탄 소원 회수

  • 서인석 (한국수자원공사 수자원연구원 상하수도연구소) ;
  • 김홍석 (한국수자원공사 수자원연구원 상하수도연구소) ;
  • 김병균 (한국수자원공사 수자원연구원 상하수도연구소) ;
  • 김연권 (한국수자원공사 수자원연구원 상하수도연구소)
  • Received : 2008.09.29
  • Accepted : 2008.11.28
  • Published : 2008.12.15
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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

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