搜索结果: 1-8 共查到“农学 COD”相关记录8条 . 查询时间(0.115 秒)
Warming waters contributed to the collapse of New England's cod fishery
Warming waters New England cod fishery
2015/11/12
For centuries, cod were the backbone of New England's fisheries and a key species in the Gulf of Maine ecosystem.Today, cod stocks are on the verge of collapse, hovering at 3-4 percent of sustainable ...
New Study:Warming Waters a Major Factor in the Collapse of New England Cod
Warming Waters New England Cod
2015/11/12
For centuries, cod were the backbone of New England’s fisheries and a key species in the Gulf of Maine ecosystem. Today, cod stocks are on the verge of collapse, hovering at 3-4% of sustainable levels...
试验采用超声波作用去除垃圾渗滤液中COD和氨氮。通过正交设计，探讨了活性炭用量、pH值、超声波功率、辐照时间、曝气时间5个因素对COD和氨氮去除率的影响。结果表明在活性炭用量1.0g，pH为9，超声波强度为360W，辐照时间为6min，曝气时间为6min时处理COD和氨氮综合去除效果最好，COD去除率为63.7%，氨氮去除率为80.24%。
UV254作为COD替代参数用于猪场污水的监测
猪场污水 UV254 COD
2009/7/2
为选择一种简便、快速、廉价的监测方法代替猪场污水处理中COD的日常监测，通过实验，考察了UV254与猪场污水原水COD及MBR处理出水COD的相关性，并验证了NH3N、NO-3N和NO-2N浓度对水样UV254的影响。结果表明，猪场污水原水和MBR处理出水的UV254与COD有良好的相关性；NH3N、NO-3N和NO-2N浓度对水样UV254影响不显著。UV254代替COD用于猪场污...
Fenton 试剂处理缫丝废水中COD 的研究
缫丝废水 Fenton 试剂 废水处理
2009/6/25
用Fenton 试剂法对缫丝厂的工业废水进行研究, 分析了各因素影响程度及作用机理, 得出了最佳的操作条件为:H2O2/ COD1 .8 ,
Fe2 + 浓度40 mmol/ L, 反应温度50 ℃,pH 值3 , 反应时间90min, 最终的去除率为67% 左右。
垃圾渗滤液的COD 与TOC 相关性研究
垃圾渗滤液 COD TOC 相关性
2009/6/15
[ 目的] 研究通过测定垃圾渗滤液TOC 来预测COD 的可行性。[ 方法] 测定国内不同地区7 个垃圾填埋场的TOC 和COD 值, 通过
文献获得不同地区的TOC 和COD 数据。利用MS Modeling 4 .0 中的线性回归方法建立TOC 与COD 的关系方程, 分析TOC 和COD 的相关
关系。[ 结果] 结果表明,COD 与TOC 具有较好的相关性。可通过测定TOC 来预测C...
Differential Egg Mortality of Georges Bank Cod and Haddock Inferred from Two Independent Estimates of Seasonal Egg Production
Atlantic cod egg mortality Georges Bank haddock spawning pattern
2008/10/21
Georges Bank Atlantic cod (Gadus morhua) and haddock (Melanogrammus aeglefinus) stocks have undergone significant changes over the last 40 years with the reduction of older spawners and increased in...
Relationships Between Spawning Ground Identity, Latitude and Early Life Thermal Exposure in Northeast Arctic Cod
general circulation model larval fish northeast Arctic cod retention temperature
2008/10/21
The Northeast Arctic cod (Gadus morhua), is well known for extensive upstream migrations
from its feeding grounds in the Barents Sea to various spawning banks along the Norwegian coast.
Prior to the...