厌氧发酵碱度和有机酸在线监测系统设计与实验  

Design and Test of Alkalinity and VFA Online Monitoring System in Anaerobic Fermentation

作　　者：吴树彪[1] 顾雯雯[1] 庞昌乐[1] 董仁杰[1] 邓媛方 

机构地区：[1]中国农业大学工学院,北京100083 [2]江苏省生物质能与酶技术重点实验室,淮安223300

出　　处：《农业机械学报》2013年第10期172-176,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：'十二五'国家科技支撑计划资助项目(2012BAD47B00;2011BAD15B04);江苏省生物质能与酶技术重点实验室开放课题资助项目(JSBEET1221)

摘　　要：厌氧发酵过程中发酵液缓冲能力不足容易导致系统酸化,碱度是衡量发酵液缓冲能力的重要指标,其在线监测成为控制厌氧发酵过程稳定运行的重要手段。设计了一种基于碱度和有机酸(VFA)联合滴定的在线监测系统,详细介绍了基于LabVIEW的软件系统设计。该系统能够同时测定碱度和VFA,实现了pH值标定、微量液体自动滴定和补充、实时生成滴定曲线、自动分析计算等功能。实验验证结果表明:该系统具有快速测定发酵液碱度和VFA的能力,相对标准偏差基本在5%左右,低于手动滴定值,测定的准确度和精度较高。Lack of buffering capacity of fermentation substrate in anaerobic digestion may easily lead to acidification. Alkalinity is a key indicator for measuring buffering capacity of the fermentation substrate, so its online monitoring should be enhanced to keep the anaerobic fermentation process stable automatically. An online monitoring system based on joint titration of alkalinity and VFA was designed. The software system was introduced in detail. The system could determine alkalinity and VFA simultaneously, which achieved real-time curve display and pH meter calibration. Moreover, automatic analysis could be realized. The experiment results showed that the system had the ability of the rapid determination of alkalinity and VFA in the fermentation process. The relative standard deviation was less than 5% , which was lower than the manual titration and indicated a high measurement accuracy of the proposed system.

关 键 词：厌氧发酵液 碱度 有机酸 在线监测 滴定 实验 

分 类 号：S216.4[农业科学—农业机械化工程]