查询词典 oxygen-deficient

They are commonly measured in units of biochemical oxygen demand, or the amount of oxygen needed to decompose them

常常使用生化需氧量，即有机物分解所需的氧这个单位进行测量。

The most common of these measures are biochemical oxygen demand and chemical oxygen demand.

并且氧气被用作有机物的分解同且用作实物。

Biochemical Oxygen Demand is an important control index in wastewater effluent ,but it takes longer time(5 days)for its determination,while the time for measuring the Chemical Oxygen Demand is shorter(10 hours).

生化耗氧量是废水排放的重要控制指标，但它的测定需要时间较长，而化学耗氧量的测定时间较短，这两者是否存在稳定的关系？

Generally aerobic and anaerobic wastewater treatment plants require substantial areas of land for the effective treatment of liquid waste streams to achieve very low levels of Biochemical Oxygen Demand and Chemical Oxygen Demand reduction.

通常，好氧和厌氧的废水处理设备需要大量土地以进行有效的废液处理，把生化需氧量和化学需氧量减少到非常低的程度。

The oxygen consumed,or biochemical oxygen demand,is proportional to the organic matter converted ,and therefore BOD is a relative measure of the biologically degradable organic matter present in the system .

氧消耗量，或生化需氧量，是成正比的有机质转换，因此，生化需氧量是一个相对的措施，生物可降解的有机物，目前在该系统。

Biochemical oxygen demand over five days - BOD5: The standard biochemical oxygen demand test whereby a sample of the liquid is incubated at 20 degrees C for five days.

五天生化需氧量(简写为BOD5)：标准的生化需氧量试验。其方法是把一份溶液的样品在摄氏20度下培养五天。

The results showed that the IVCW effectively removed total suspended solids(85%),chemical oxygen demand(50%),five-day biochemical oxygen demand(44%),total ammonia(53%),nitrite(83%) and nitrate(54%) from the aquaculture wastewater at a hydraulic loading rate of 420mm/d.

结果表明，在420 mm/d的水力负荷下，湿地可有效地去除循环水中的总悬浮物(去除率85%)、CODCr(去除率50%)、BOD5(去除率44%)、总氨氮(去除率53%)、亚硝酸盐(去除率83%)和硝酸盐(去除率54%)，能够满足养殖用水的要求，整个试验期间系统实现了零污水排放。

The results showed that the IVCW effectively removed total suspended solids (85%), chemical oxygen demand (50%), 5-day biochemical oxygen demand (44%), total ammonia (53%), nitrite (83%) and nitrate (54%) from the aquaculture wastewater at a hydraulic loading rate of 420mm/d.

结果表明，在420mm/d的水力负荷下，湿地可有效地去除循环水中的总悬浮物(去除率85%)、CODCr(去除率50%)、BOD5(去除率44%)、总氨氮(去除率53%)、亚硝酸盐(去除率83%)和硝酸盐(去除率54%)，能够满足养殖用水的要求，整个试验期间系统实现了零污水排放。

Growing Low-Oxygen Zones in Oceans Worry Scientists [Mar 7] In some spots off Washington state and Oregon, the almost complete absence of oxygen has left piles of Dungeness crab carcasses littering the ocean floor, killed off 25-year-old sea stars, crippled colonies of sea anemones and produced mats of potentially noxious bacteria that thrive in such conditions.

&海洋上不断增长的低氧气区域令科学家们担心&（3月7日）。在沿着华盛顿州和俄勒冈州的某些地方，几乎整个地缺乏氧气，导致成堆的Dungeness螃蟹的尸体散落在海底，使25岁的大的海星死亡，毁坏了海葵生活的群落，产生了大簇在此条件下兴盛的，具有潜在毒性的细菌。

Growing Low-Oxygen Zones in Oceans Worry Scientists [Mar 7] http://news.yahoo.com/s/mcclatchy/20100307/sc_mcclatchy/3444187 In some spots off Washington state and Oregon, the almost complete absence of oxygen has left piles of Dungeness crab carcasses littering the ocean floor, killed off 25-year-old sea stars, crippled colonies of sea anemones and produced mats of potentially noxious bacteria that thrive in such conditions.

&海洋上不断增长的低氧气区域令科学家们担心&（3月7日） http：//news.yahoo.com/s/mcclatchy/20100307/sc_mcclatchy/3444187 。在沿着华盛顿州和俄勒冈州的某些地方，几乎整个地缺乏氧气，导致成堆的Dungeness螃蟹的尸体散落在海底，使25岁的大的海星死亡，毁坏了海葵生活的群落，产生了大簇在此条件下兴盛的，具有潜在毒性的细菌。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。