Analysis and treatment of cellulosic fuel ethanol wastewater

摘要

Currently, technologies of ethanol production from inexpensive lignocellulosic biomass (i.e corn stover) are gradually shifted into the industrialization due to the ever-increasing demand of fuel ethanol. Hence, treatment of wastewater from cellulosic ethanol production is a feasible solution. A cellulosic ethanol pilot plant with a processing capability of 500 t/a, which use acid pretreated corn stover as substrate, has been built in COFCO, Zhaodong, China in 2006. The wastewater from the plant was analyzed and two-phase anaerobic (CSTR+EGSB) -aerobic (SBR) process was designed to treat this wastewater in this study. The wastewater quality analysis followed the Chinese National Standard, and the suspended substances ( SS ) in the wastewater were around 187060 mg/L, chemical oxygen demands ( COD ) were around 294129 mg/L. biochemical oxygen demand (BOD) were around 115444 mg/L, pH was around 4.17, total salinity (TDS) was around 82677 mg/L. 64 kinds of volatile organic compounds, most of which were organic acids, were detected in the waste water according to the results of qualitative analysis by full-scan GC-MS. The biological wastewater treatment reactors were run for 81 days. The total COD removal rate can be reached to around 80% with the inflow of 8.64L/d and the inlet COD around 8000 mg/L. According to the results the water is a kind of high concentrated organic wastewater with high salinity, the relative lower removal rate of COD may be caused by high salinity.