餐厨垃圾单相厌氧消化系统酸化预警指标  

Early-warning Indicators of Acidification in the Single-phase Anaerobic Digestion Process for Food Wastes

作　　者：彭绪亚[1] 贾传兴[1] 潘坚[1] 刘国涛[1] 袁荣焕[1] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《土木建筑与环境工程》2011年第4期146-150,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：国家"十一.五"科技支撑计划项目(2010BAC67B01-03);重庆市科技重大专项(CSTC2008AB7135);重庆大学研究生创新团队建设项目(200909B1003)

摘　　要：针对餐厨垃圾单相厌氧消化系统极易酸化、缺乏有效预警监控指标的技术瓶颈,在中温条件下利用自行设计的单相厌氧消化反应器,进行了实验室规模的启动、连续式单相厌氧消化系统运行试验,通过深入分析表征系统酸碱抵抗能力指标的变化规律,选取挥发性脂肪酸(VFA)、碳酸氢盐碱度与总碱度的比值(BA/TA)和挥发性脂肪酸总浓度与碳酸氢盐碱度的比值(VFA/BA)作为餐厨垃圾厌氧消化系统酸化抑制的指示性指标。当VFA/BA>0.8、BA/TA<0.4或VFA>3 000mg/L时,表明系统缓冲能力极小,应及时采取调控措施预防系统酸化;而当BA/TA≥0.8、VFA/BA<0.4时系统碱度较高,可以在较高负荷下运行以提高系统的产气效率。The commonly used indicators are often too slow to reflect the operating status in time. Confronted with lacking reliable early-warning indices in the single-phase anaerobic digestion for kitchen waste which is easy to decay, lab-scale experiments of start-up and continuous operation process of anaerobic digestion for kitchen waste were carried out in the single-phase anaerobic reactor which is self- designed under mesophihc conditions. Those values which reflect the capacity of acidity-basicity resistance, including the ratio of bicarbonate alkalinity to total alkalinity （BA/TA）, absolute testing value of volatile fatty acid （VFA） and the ratio of total concentration for volatile fatty acid to bicarbonate alkalinity （VFA/ BA）, are determinated to be the early-warning indices for acidification and imbalance of single-phase anaerobic digestion for kitchen waste. It is considered that,when VFA/BA〉0.8,BA/TA〈0.4 and VFA〉 3000mg/L,buffering capacity of the system is very poor,and the system might be out of control. Therefore, an immediately steps must be taken. While,when BA/TA≥0. 7-0.8 and VFA/BA〈0.4, the alkalinity of system is relatively better and the process can be operated with higher organic volumetric loading,which can raise the biogas-producing efficiency and get economic benefit.

关 键 词：餐厨垃圾 厌氧消化 酸化 预警指标 碳酸氢盐碱度 

分 类 号：X799.3[环境科学与工程—环境工程]