Improving the biological degradation of post-hydrothermal liquefaction wastewater by ozone treatment
The hydrothermal liquefaction process is a promising technology to convert wet biomass into bio-oil.However,post-hydrothermal liquefaction wastewater (PHWW) is also produced during this process,and this wastewater contains a high concentration of phenols and N-heterocyclic compounds.Thus,pretreatment is required before biologically treating the PHWW.In this work,ozone was used as a pretreatment with a dosage range of 0-4.64 mg O3/mL PHWW.A significantly improved biodegradability of PHWW was observed after the ozone treatment.The ratio of BOD5/COD was increased from 0.31 to 0.41.The improved biodegradability of PHWW is justified by the selective conversion of phenols and N-heterocycles compounds.After ozone treatment,the phenols were fully converted,and acids were produced.However,N-heterocycles compounds were found to have a low conversion rate (21.7%).The kinetic degradation of phenols and N-heterocyclic compounds showed that the substitute played an important role in the priority of ozone reactions.The OH moiety in the ring compounds (phenols and pyridinol) may form hydroxyl radical,which lead to an efficient reaction.
Hydrothermal liquefaction Ozone treatment Biodegradation Phenols N-heterocyclic compounds
Libin Yang Buchun Si Yuanhui Zhang Xuefei Zhou Huaqiang Chu Yalei Zhang
Department of Environment and Science Engineering, TongjiUnversity, Shanghai, China College of Water Resources and Civil Engineering, China AgriculturalUniversity, Beijing, China Agricultural and Biological Engineering, University of Illinois Urbana Champaign, USA
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
733-735
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）