Fermentative Hydrogen Production from the Pretreated Food-Processing Waste and Sewage Sludge using Chemical/Ultra-Sonication

두부제조폐기물과 하수슬러지의 화학/초음파 전처리에 의한 가용화 및 혐기발효 수소생산

  • Received : 2010.09.30
  • Accepted : 2010.12.17
  • Published : 2010.12.31

Abstract

Acid and alkali pretreatments were applied to tofu processing waste (TPW) to increase the solubility of ingredients in TPW. Pretreatment at 1.0% of HCl and 2.5% of NaOH condition resulted in the increase of SCOD concentration from 3.2 g COD/L to 27 g COD/L and 33 g COD/L, respectively. The acid and alkali-pretreated TPW was studied for its fermentative $H_2$ production capacity in batch mode using a thermophillic mixed culture. Alkali pretreatment on presence of 2.5% NaOH exhibited more soluble portion released compared to acid pretreatment using HCl, however the $H_2$ production from acid pretreated TPW was better than alkali-pretreated TPW probably due to the sodium inhibition on microbial activity. In addition, sewage sludge was externally added to the acid-pretreated (1.0% HCl) TPW by 20% (on volume basis). Average H2 production rate was increased from 31 to 78 ml/L-broth/hr, and it was attributed to the high buffer capacity and abundant nutrients especially divalent cation in sewage sludge.

Keywords

Hydrogen;Anaerobic fermentation;Tofu-processing waste;Pre-treatment;Sewage sludge

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