摘要：
In order to realize the effective utilization and management of biogas slurry,according to the actual production situation of biogas slurry anaerobic fermentation,the simulated fermentation experiment was carried out in view of the extensive anaerobic fermentation mode and the long-term storage of biogas slurry in actual production.The treatments were carried out in five different fermentation cycles(at 2,4,6,8,10 d,respectively) and the pig manure raw materials were discharged at this time point for producing biogas slurry.Then the nutrient contents and physical and chemical property varieties such as COD,pH,TN,TP and TK were studied during storage,as well as the impact of screen filter on nutrients and physical and chemical properties of biogas slurry.The results showed that the contents of TN and TP in the five kinds of biogas slurry decreased by 40.9％～46.31％ and 35.62％～53.6 1％,respectively with the increase of fermentation period and storage time,the content of TK showed a slight increase with time,but the increase remained stable.During the storage period,the contents of ammonium nitrogen decreased gradually which decreased by almost 62％ after 14 days.In contrast,the nitrate nitrogen contents increased gradually.The COD decreased by 69.97％～85.86％ and the pH value of all the biogas slurries were increasing from nutrient contents,COD and pH value of the biogas solution were not significantly different after filtering through different aperture screen,so the filtration would not affect the nutrient storage of biogas.7.6～7.9 to 8.2～8.7.The nutrient contents, COD and pH value of the biogas solution were not significantly different after filtering through different aperture screen, so the filtration would not affect the nutrient storage of biogas.%针对实际生产中中小型养殖场不规范和粗放式厌氧发酵模式以及沼液需要长时间贮存的问题,为实现沼液养分有效利用与管理,根据沼液厌氧发酵实际生产状况,进行模拟发酵实验.设置2、4、6、8、l0d等5个不同的发酵周期处理并分别在该时间点进料出料,研究出料沼液在贮存过程中COD、pH、TN、TP和TK等养分和理化特性变化以及网筛过滤对养分和理化性状的影响.结果表明:随着发酵周期与贮存时间的延长,28 d后5种沼液中TN和TP含量分别减少了40.9％～46.31％、35.62％～53.61％;TK的含量呈现随时间延长有小幅增加的趋势,基本维持稳定.贮存期内铵态氮含量逐渐降低,贮存14d各降幅接近62％;与之相反,硝态氮的含量则呈现逐渐增高的趋势.所有处理沼液在贮存过程中COD下降了69.97％～85.86％,pH值变化均呈现逐渐升高的趋势,从7.6～7.9变为8.2～8.7.经过不同孔径网筛过滤后,沼液的养分含量、COD和pH值变化不具有显著性差异,因此过滤不会对沼液的养分存储造成影响.
