title: Pilot-scale experiment on thermally hydrolyzed sludge liquor anaerobic digestion using a mesophilic expanded granular sludge bed reactor.
abstract: A pilot process of thermal hydrolysis combined with an expanded granular sludge bed reactor (EGSB) was carried out to evaluate pretreated sludge liquor into biogas conversion, process stability, and energy input/output balance. Approximately 25% of suspended solids of sludge were liquefied into aqueous phase during thermal hydrolysis pretreatment, which resulted in chemical oxygen demand (COD) concentration of 20.0 to 35.0 g/L. A mesophilic EGSB reactor was operated for 206 days treating pretreated liquor. Under an organic loading rate of 11.0 kg COD/(m(3)·d) and hydraulic retention time of 60 h, COD conversion efficiency was maintained at 63%. The energy from biogas provided 80% of that demand for heating pretreatment. Dewatered sludge after thermal hydrolysis could be incinerated with municipal solid waste in an industrial-scale incinerator. Total energy production from combined biogas anaerobic digestion and sludge incineration, treating 1.0 kg raw sludge with moisture content of 82%, was 2419 kJ. The energy demand of thermal hydrolysis pretreatment was 340 kJ.
authors.affiliation: College of Chemical Engineering, China University of Petroleum, Beijing 102249, China E-mail: qiaowei@cup.edu.cn; qiaowmsg@gmail.com; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Qiao
authors.forename: Zhibiao
authors.initials: Z
authors.lastname: Yin
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.forename: Zhongzhi
authors.initials: Z
authors.lastname: Zhang
mesh_terms: D064751:Ammonium Compounds / Q000737:chemistry; D000693:Anaerobiosis; D019149:Bioreactors; D006358:Hot Temperature; D006868:Hydrolysis; D010758:Phosphorus / Q000737:chemistry; D010865:Pilot Projects; D012722:Sewage / Q000737:chemistry*
chemical_list: D064751:Ammonium Compounds; D012722:Sewage; D010758:Phosphorus