排序方式: 共有45条查询结果,搜索用时 15 毫秒
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规模化牛场废水灌溉对土壤水分和冬小麦产量品质的影响 总被引:2,自引:0,他引:2
通过田间小区试验,设置不同的牛场废水灌溉次数,研究了冬小麦牛场废水灌溉过程中土壤水分和冬小麦产量品质的变化特征,结果表明,灌溉牛场废水土壤水分迁移和土壤贮水量与灌溉清水无显著差别,水质对土壤水分变化影响很小;冬小麦生育期内分别灌溉牛场废水2、3和4次与正常施肥灌溉施肥相比,冬小麦产量和灌溉水生产效率提高,分别提高了4.61%、6.48%、6.63%,4次牛场废水灌溉冬小麦产量略有下降,这说明灌溉牛场废水次数过多会对冬小麦造成一定的负面影响;牛场废水灌溉次数越多冬小麦籽粒中蛋白质质量分数越高,分别提高了2.50%、5.83%、8.03%,而全磷质量分数则有降低趋势。综合考虑,冬小麦生育期内牛场废水灌溉次数不应高于3次。 相似文献
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Organic oxalate as leachant and precipitant for the recovery of valuable metals from spent lithium-ion batteries 总被引:2,自引:0,他引:2
Spent lithium-ion batteries containing lots of strategic resources such as cobalt and lithium are considered as an attractive secondary resource. In this work, an environmentally compatible process based on vacuum pyrolysis, oxalate leaching and precipitation is applied to recover cobalt and lithium from spent lithium-ion batteries. Oxalate is introduced as leaching reagent meanwhile as precipitant which leaches and precipitates cobalt from LiCoO(2) and CoO directly as CoC(2)O(4)·2H(2)O with 1.0 M oxalate solution at 80°C and solid/liquid ratio of 50 g L(-1) for 120 min. The reaction efficiency of more than 98% of LiCoO(2) can be achieved and cobalt and lithium can also be separated efficiently during the hydrometallurgical process. The combined process is simple and adequate for the recovery of valuable metals from spent lithium-ion batteries. 相似文献
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猪场废水灌溉对地下水中氮素的影响 总被引:3,自引:0,他引:3
应用猪场废水处理工程中产出的厌氧水不同灌溉量和3个处理阶段V(出水)∶V(地下水)=1∶5混合对冬小麦-夏玉米轮作系统连续进行3年小区灌溉试验,地下水中总氮、铵态氮、硝态氮和亚硝态氮等指标的监测结果表明:(1)厌氧水不同灌溉量条件下地下水中4种氮素含量总体呈现高量厌氧水(Ha)〉中量厌氧水(Ma)〉低量厌氧水(La)的变化趋势;(2)混水灌溉处理地下水中4种氮素含量均呈V(原水)∶V(地下水)=1∶5混合(Tog)〉V(厌氧水)∶V(地下水)=1∶5混合(Tag)〉V(仿生态塘水)∶V(地下水)=1∶5混合(Teg)的变化趋势。文章的研究能够为制定合理的猪场灌溉制度提供数据支撑。 相似文献