摘要
为实现沼液养分有效利用与管理,研究了规模化养猪场沼液在不同季节、不同方式贮存条件下,沼液中COD、pH、TN、TP、TK等变化,结果表明:贮存90d后,沼液中TN、TP、TK含量分别减少了67.22%～84.31%、59.70%～93.45%、35.27%～80.25%,COD下降了24.78%～42.96%;贮存期内铵态氮含量持续下降,至60d后基本保持稳定,90d后4个处理铵态氮减少了75.35%～89.71%,硝态氮含量增加了3～6倍。比较不同季节,在贮存期前60d内,夏秋季的COD浓度以及TN、TP、NH+4-N下降幅度高于冬春季,而在贮存60d后,冬春季贮存沼液中TN、TP、NH+4-N下降幅度显著高于夏秋季;沼液加盖贮存,在前期可减少沼液中TN、TP、NH+4-N量的下降,但贮存90d时,其贮存方式对TN、TP、NH+4-N量变化的影响已不明显。试验结果为沼液的存放和农田施用提供了重要参数。
Changes of COD and nutrients content in anaerobically digested slurry（ADS） of pig manure produced from large biogas plant are monitored during 90-day storage under different conditions to achieve its effective utilization and management of nutrients The results showed that the contents of total N（TN）,total P（TP）,total K（TK） and COD decreased by 67.22%～84.31%,59.70%～93.45%,35.27%～ 80.25% and 24.78%～42.96%,respectively.The ammonium-N content decreased constantly in the 60-day storage time and remained stable in the next 30 days.The ammonium-N concentration reduced by 75.35% ～89.71% while the nitrate content increased by 4 ～6 folds after storage for 90 days.During the first 60 days,the decrement of concentration of COD,TN,TP,TK,ammonium-N and nitrate was more signif-icant in Summer-Autumn than those of in Winter-Spring.However,the reduction of T-N,T-P and ammonium-N contents were more signifi-cant in Winter-Spring than those of in Summer-Autumn 60 days later.The ADS stored in sedimentation pond covered by lid lessened the de-creasement of TN,TP and ammonium-N contents during the early period of storage.No significant differences on the changes of TN,TP and ammonium-N contents of ADS in sedimentation pools covered or uncovered were found after 90 days of storage.The above-results provided important information for reasonable storage and application of ADS.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第12期2493-2499,共7页
Journal of Agro-Environment Science
基金
农业部公益性行业计划(200903011-01)
关键词
猪粪沼液
贮存
养分
变化
anaerobically digested pig slurry
storage
nutrient
change
