Impact of Alkaline H2O2 Pretreatment on Methane Generation Potential of Greenhouse Crop Waste under Anaerobic Conditions

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PERENDECİ N. A., GOKGOL S., ORHON D.

MOLECULES, cilt.23, sa.7, 2018 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Sayı: 7
  • Basım Tarihi: 2018
  • Doi Numarası: 10.3390/molecules23071794
  • Dergi Adı: MOLECULES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: alkaline H2O2 pretreatment, breakdown of lignocellulosic structure, greenhouse crop waste, methane generation, process optimization, HYDROGEN-PEROXIDE PRETREATMENT, ENZYMATIC-HYDROLYSIS, ETHANOL, LIGNOCELLULOSE, SLUDGE, WATER, SACCHARIFICATION, TECHNOLOGIES, BAGASSE, BIOMASS
  • Akdeniz Üniversitesi Adresli: Evet

Özet

This paper intended to explore the effect of alkaline H2O2 pretreatment on the biodegradability and the methane generation potential of greenhouse crop waste. A multi-variable experimental design was implemented. In this approach, initial solid content (3-7%), reaction time (6-24 h), H2O2 concentration (1-3%), and reaction temperature (50-100 degrees C) were varied in different combinations to determine the impact of alkaline H2O2 pretreatment. The results indicated that the alkaline H2O2 pretreatment induced a significant increase in the range of 200-800% in chemical oxygen demand (COD) leakage into the soluble phase, and boosted the methane generation potential from 174 mLCH(4)/g of volatile solid (VS) to a much higher bracket of 250-350 mLCH(4)/gVS. Similarly, the lignocellulosic structure of the material was broken down and hydrolyzed by H2O2 dosing, which increased the rate of volatile matter utilization from 31% to 50-70% depending on selected conditions. Alkaline H2O2 pretreatment was optimized to determine optimal conditions for the enhancement of methane generation assuming a cost-driven approach. Optimal alkaline H2O2 pretreatment conditions were found as a reaction temperature of 50 degrees C, 7% initial solid content, 1% H2O2 concentration, and a reaction time of six h. Under these conditions, the biochemical methane potential (BMP) test yielded as 309 mLCH(4)/gVS. The enhancement of methane production was calculated as 77.6% compared to raw greenhouse crop wastes.