Pig slurry concentration by vacuum evaporation:: Influence of previous mesophilic anaerobic digestion process

被引:28
作者
Bonmatí, A [1 ]
Flotats, X [1 ]
机构
[1] Univ Lleida, Dept Environm & Soil Sci, Lab Environm Engn, Lleida, Spain
来源
JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION | 2003年 / 53卷 / 01期
关键词
D O I
10.1080/10473289.2003.10466112
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Water can be removed from pig slurry by evaporation, through the application of wasted heat from, a power plant or from other processes. Apart from obtaining a concentrate with an obviously higher nutrient concentration than the original slurry, another objective of water removal is to obtain water as condensate, which could be reused. The objective of this work was to study the vacuum evaporation of pig slurry liquid fraction and to evaluate condensate composition as a function of both pH (4, 5, and 6) and pig slurry type (fresh slurry and anaerobically digested slurry). Batch experiments showed that condensate characteristics, total ammonia nitrogen (NH3-N), volatile fatty acids (VFA), and chemical oxygen demand were strongly dependent on initial slurry pH. In addition to producing part of the required thermal energy, previous anaerobic digestion presented several other clear advantages. The consumption of VFA and other volatile organic compounds during anaerobic digestion reduced the volatilization of organic matter in the evaporation treatment and, consequently, provided a higher quality condensate.
引用
收藏
页码:21 / 31
页数:11
相关论文
共 18 条
[1]  
*APHA AWWA, 1995, STAND METH EX WAT WA
[2]  
BECK J, 1998, MANURE TECHNIQUES EU, P11
[3]   LANDFILL LEACHATE TREATMENT BY EVAPORATION [J].
BIRCHLER, DR ;
MILKE, MW ;
MARKS, AL ;
LUTHY, RG .
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 1994, 120 (05) :1109-1131
[4]  
GRUTER H, 1990, WATER SCI TECHNOL, V22, P57
[5]  
HAVE PJW, 1993, EUR C ENV AGR STOCK, P29
[6]  
HILL DT, 1990, T ASAE, V33, P1717, DOI 10.13031/2013.31531
[7]  
HILL DT, 1989, T ASAE, V32, P2175, DOI 10.13031/2013.31280
[8]  
HUERCIO A, 1994, SER CHEM ENG, V38, P81
[9]  
IZA J, 1995, 1R CURS ENGINYERIA A, P175
[10]  
LIDE, 1993, CRC HDB CHEM PHYSICS