Journal of the Korea Organic Resources Recycling Association (유기물자원화)

Korea Organic Resources Recycling Association (유기성자원학회)
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Enhanced Acidification Efficiency of Sewage Sludge by Seaweed Addition

해조류 첨가를 통한 하수슬러지 산발효 효율 증대

  • 신상룡 (인하대학교 사회인프라공학과) ;
  • 이모권 (인하대학교 사회인프라공학과) ;
  • 김민균 (인하대학교 사회인프라공학과) ;
  • 홍성민 (아쿠아테크) ;
  • 김동훈 (인하대학교 사회인프라공학과)
  • Received : 2016.12.28
  • Accepted : 2017.01.13
  • Published : 2017.03.30
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Abstract

In the present work, the synergistic effect of seaweed addition on organic acid production from sludge was investigated. The batch experiment was conducted at various mixing ratios of sewage sludge and seaweed (100:0, 75:25, 50:50, 25:75, 0:100 on a COD basis) under the substrate concentration of 20 g COD/L. The fermentation temperature was conducted under mesophilic condition ($35^{\circ}C$) and a heat-treated ($90^{\circ}C$ for 20 min) anaerobic digester sludge was used as a seeding source to suppress the methanogenic activity, The results showed that the amount of organic acid production increased as the content of seaweed increased: organic acids were 1.45, 3.22, 4.28, 5.24 and 4.82 g COD/L for the mixing ratio of 100:0, 75:25, 50:50, 25:75 and 0:100 respectively. The synergistic effect was calculated based on the organic acid production of individual sludge and seaweed, and was found to be 0.92, 1.14, 1.26 g COD/L at the mixing ratio of 75:25, 50:50 and 25:75, which indicates that 40% of synergy was obtained when 25% of seaweed was added. The synergistic effect could be ascribed to the high C/N ratio and biodegradability of seaweed.

본 연구에서는 하수슬러지의 유기산 생산에 있어 해조류 첨가를 통한 상승효과를 확인하고자 새로운 접근을 시도하였다. 기질농도를 동일하게 20 g COD/L로 하고 하수슬러지와 해조류의 혼합비율을 COD 기준, 100:0, 75:25, 50:50, 25:75, 0:100으로 조절하여 실험하였다. 실험 온도는 $35^{\circ}C$, 중온에서 이루어졌고 메탄 생산균의 활성을 억제하기 위해서 $90^{\circ}C$, 20분간 열처리된 혐기성소화슬러지를 식종균으로 이용하였다. 실험결과를 살펴보면, 해조류의 첨가량이 증가할수록 유기산의 농도도 증가하는 경향을 나타내었으며 혼합비율별 100:0, 75:25, 50:50, 25:75, 0:100 (하수슬러지:해조류) 유기산 생산량은 각각 1.45, 3.22, 4.28, 5.24, 4.82 g COD/L이었다. 하수슬러지와 해조류만의 유기산 생산량을 기반으로 하여 상승효과를 계산한 결과, 혼합비율 75:25, 50:50, 25:75 에서 각각 0.92, 1.14, 1.26 g COD/L로 나타났다. 이는 해조류가 25% 비율로 첨가 시 전체 생산된 유기산의 40%가 상승효과에 의해 생산되었음을 의미하며, 해조류의 상대적인 높은 C/N비와 생분해도에 기인한다.

Keywords

References

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