乙醇-沼气双发酵耦联工艺中硫酸根的调控探讨  

Investigation on sulfate regulation in integrated ethanol-methane fermentation process

作　　者：杨西昭[1,2] 唐蕾[1,2] 王柯[1,2] 张建华[1,2] 毛忠贵[1,2] 

机构地区：[1]江南大学工业生物技术教育部重点实验室,江苏无锡214122 [2]江南大学生物工程学院,江苏无锡214122

出　　处：《工业微生物》2014年第1期13-18,共6页Industrial Microbiology

基　　金："十一五国家863"计划(编号:2008AA10Z338);江苏省科技支撑计划(编号:BE2011623)

摘　　要：为了实现木薯燃料乙醇发酵过程的无废(废水)制造目的,提出了乙醇-沼气双发酵耦联工艺。在该工艺中,液化时向发酵液中引入的硫酸根离子是整个系统的限制性因素。硫酸根在厌氧消化过程还原会造成沼液碱度的升高,并且高浓度硫酸盐还原产物硫化物对产甲烷菌和酵母具有毒害作用,因此需要对其进行调控。本文分别采用了氢氧化钙沉淀法和部分蒸馏废液回用法对硫酸根进行调控,都显著降低了系统中硫酸根的浓度。但是,沉淀法会产生设备、管道等结垢堵塞等问题,工业化推广受限。回用法调控效果显著,在不影响酒精发酵的情况可进一步提高回用比例,将硫酸根浓度控制在更低水平。In order to achieve the goal of non-waste production in the cassava-based ethanol fermentation, an integrated ethanol-methane fermentation process was proposed. In this process, the sulfate introduced to the culture medium in the liquefaction was a restrictive factor. Reduction of sulfate in the anaerobic digestion process could enhance the alkalinity of the digestate , besides reducing production, sulfide, was toxic to methanogens and S. cerevisiae. Therefore, it was neces- sary to control the sulfate in the integrated process. In this study, methods of calcium hydroxide precipitation and stillage reuse were adopted to control the sulfate, respectively. Results indicated that both methods efficiently reduced the concen- tration of sulfate in the process. However, calcium hydroxide precipitation consumed massive energy, thereby being re- stricted to use on the production scale. The recycling ratio of the stillage could result in further decrease of the concentration of sulfate under the condition that ethanol fermentation was not affected.

关 键 词：乙醇发酵 无废制造 硫酸根 沼液 

分 类 号：TQ920.6[轻工技术与工程—发酵工程]