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nutrients pollution
相关语句
  营养盐污染
     Heavy Metals and Nutrients Pollution in Sediments of Taihu Lake
     太湖沉积物重金属及营养盐污染研究
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  “nutrients pollution”译为未确定词的双语例句
     The accumulation of nitrogen and phosphorus compounds by discharge of wastewater is one of the main causes of eutrophication in water bodies. How to control nutrients pollution high-efficiency and economically has become an urgently solved problem at present.
     氮磷污染是引起水体富营养化的重要原因,经济而有效地控制氮磷污染已成为当前亟待解决的环保问题。
短句来源
  相似匹配句对
     The pollution
     通常克服电磁污染的方法有屏蔽和吸收。
短句来源
     Heavy Metals and Nutrients Pollution in Sediments of Taihu Lake
     太湖沉积物重金属及营养盐污染研究
短句来源
     White pollution
     白色污染
短句来源
     Limits on nutrients
     应限制饲料中的养分含量
短句来源
     Nutrients and Medicines
     营养素和医药(英文)
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  nutrients pollution
Nutrients pollution at the lower reaches of Mediterranean coastal rivers in Israel.
      


By means of SEDEX, ASPILA and XRF, concentration of total phosphorus and its types in one sediment core sampled by multicorer in the East China Sea (30 48°N,122 61°E, 18 m in water depth) in 1998 were analyzed. It is shown that contents of total phosphorus(TP), organic \| phosphorus(O \| P) and iron \| phosphorus(Fe \| P) decreased, while that of absorbed phosphorus(Ab \| P) and detritus phosphorus(D \| P) increased with depth of sediment core. The tendency of calcium \| phosphorus is not obvious. Combined...

By means of SEDEX, ASPILA and XRF, concentration of total phosphorus and its types in one sediment core sampled by multicorer in the East China Sea (30 48°N,122 61°E, 18 m in water depth) in 1998 were analyzed. It is shown that contents of total phosphorus(TP), organic \| phosphorus(O \| P) and iron \| phosphorus(Fe \| P) decreased, while that of absorbed phosphorus(Ab \| P) and detritus phosphorus(D \| P) increased with depth of sediment core. The tendency of calcium \| phosphorus is not obvious. Combined with analyzed results of grain size, mineral and chemical composition, isotopic age in the sediment core as well as some other data, it is cognized that the changes of phosphorus and its different forms reflect that land base nutrients pollution in this sea region, influenced probably both by Changjiang River and Qiantang River, becomes more intense in last 10 years.

综合运用 SEDEX化学法、ASPILA化学法和 XRF仪器分析法 ,对在东海赤潮多发区花鸟山外海域采集的柱状沉积物进行了总磷及其不同形态磷含量的系统分析。研究表明 ,总磷及其不同形态磷在沉积柱垂向上的分布有一定的变化规律。在采样深度范围内 ,总磷 (TP)、有机磷 (OP)和铁结合态磷 (Fe - P)的含量自下而上增高 ,而吸附态磷 (Ad - P)、自生钙结合态磷 (Ca- P)与碎屑态磷 (De- P)的含量向上递减。样品柱具有较均匀的粒度及矿物、化学组成 ,基本可以排除沉积物质来源和沉积环境变化对沉积物中磷含量的影响 ,而且也不能仅仅用早期成岩作用来解释磷的上述行为。不同形态磷在柱状沉积物中的分布规律 ,在一定程度上反映了近年来陆源区环境污染加剧的趋势。

In order to reuse of treated water from wastewater treatment plants, we monitored the quality of outlet waters from 4 wastewater treatment plants in Shanghai. The treated domestic wastewater and industrial wastewater were discussed separately as they differed in the characteristics. The results showed: (1) High contents of N, P and microorganisms were found in the treated domestic wastewater. Therefore, proper patterns of irrigation, such as trickle irrigation, should be selected when it was reused for agriculture...

In order to reuse of treated water from wastewater treatment plants, we monitored the quality of outlet waters from 4 wastewater treatment plants in Shanghai. The treated domestic wastewater and industrial wastewater were discussed separately as they differed in the characteristics. The results showed: (1) High contents of N, P and microorganisms were found in the treated domestic wastewater. Therefore, proper patterns of irrigation, such as trickle irrigation, should be selected when it was reused for agriculture to avoid pathogen and nutrient pollution to crops and environment. Because of low heavy metal contents in the treated domestic wastewater, neither soil nor crops have potential of pollutants from heavy metals in a short period. However, risk of heavy metal pollution could not be prevented as heavy metals are easily accumulated in soil. (2) Organic pollutant contents in the treated chemical wastewater was high; Cl- was as high as two times the recommended limit value in《Water Quality Standards for Agricultural Irrigation》; and Zn and Cd et al were also higher than expected. To prevent from disastrous consequence to the agricultural ecological environments, such secondary wastewater should not be used for irrigation unless it is treated by more advanced processes.

对上海市正在运作的四家污水处理厂的出水质量进行监测,研究了污水厂出水的环境质量与农业再利用问题。由于处理后的生活污水和工业污水在性状上仍有很大差异,在文中分别进行讨论:(1)生活污水厂出水氮、磷负荷很高,大肠杆菌指标也严重超标。若直接用于农业灌溉,应重视营养盐和病菌对环境的污染问题。选用适当的灌溉方式,可减轻或避免这类污染。生活污水厂出水重金属含量并不高,用于农业灌溉,在短期内对土壤和蔬菜的重金属污染风险并不大;但由于重金属元素易累积等原因,这类风险还不能完全排除。(2)处理后的化工污水,仍有很高的有机污染负荷;Cl-约是《农田灌溉水质标准》中最大允许值的2倍;Zn和Cd等重金属也明显偏高。在污水厂改进处理工艺、降低各类污染物负荷前,还不能直接用于农业灌溉,以免给农业生态环境带来灾难性后果。

Phosphorus is not only an essential nutritional element for plants and animals,but it is also a significant factor in environmental pollution.Understanding phosphorus flow and balance in animal husbandry systems is very important for nutrient management on both a regional and national scale.Numerous research programs are underway to reduce pollution from animal excreta in North American and European countries such as the Netherlands,USA,Canada,Germany,Denmark,as well as in some countries of...

Phosphorus is not only an essential nutritional element for plants and animals,but it is also a significant factor in environmental pollution.Understanding phosphorus flow and balance in animal husbandry systems is very important for nutrient management on both a regional and national scale.Numerous research programs are underway to reduce pollution from animal excreta in North American and European countries such as the Netherlands,USA,Canada,Germany,Denmark,as well as in some countries of Africa.In China research about nutrient pollution from animal excreta is very limited.but this work is still very valuable.In this paper,Phosphorus flow and balance in animal husbandry systems is summarized.The study was focused on the P flow,balance and fate in a pig production system,a cattle production system,and in a fowl production system.Phosphorus flow,balance and fate in animal production systems were calculated based on actual inputs and outputs.The input included the animal feed,and the outputs included both the animal production and the animal excreta.The fate of phosphorus in such animal production systems includes mainly the phosphorus retained in the animals body as well as the fate of the phosphorus contained in the animal excreta.The utilization of excreta was evaluated according to the ratio of excreta to farm land and to the environment,etc.This research indicated that the total P output from the pig,cattle and fowl production systems used was 2729kt.This included 490kt P that was in the edible and inedible parts of the animal's body.The remainder(2230kt) was contained in the animal excreta.The transition efficiency from the feed was very low(only 18.3%).Most of the P in the animal's bodies was in the bones.According to calculations made,the P ratios([bone P/ total body P]×100) in the bones of pigs,meat chickens,and meat cows were 71.5%,71.1% and 71.6%,respectively.The total amount of P in the manure of pigs,cows and fowl was 2230kt in 2001,of which 717kt was estimated as being lost to the environment.The research results also indicated that the laying hen and pig systems contribute the most to environmental risk,with the amount of P going into the environment being 308kt for layers and 153kt for pigs,which contributed 43.0% and 21.3% of the total P going into the environment,respectively.Suggestions were also proposed on developing large scale animal production facilities with ways to decrease pollution in the future.

通过畜禽生产体系磷素的实际流动过程——磷素输入和磷素输出,计算了畜禽生产体系磷素的去向,包括畜禽活体磷素去向,不同养殖方式粪尿磷素去向;并对畜禽粪尿回田、排入环境等状况进行了评价。结果表明,从动物体磷分配来说,畜禽活体带出的磷大部分分配在骨中,肉猪骨中的磷素占活体带出磷的71.5%,肉鸡骨中的磷素占活体带出磷的71.1%,肉牛骨中的磷素占活体带出磷的71.6%。计算还表明:蛋鸡和肉猪生产体系对环境造成的污染风险相对其他畜禽生产体系来说最大,中国2001年蛋鸡生产体系向环境排放磷量为30.8万t,占猪牛鸡向环境排放总磷量的43.0%;肉猪生产体系向环境排放磷量为15.3万t,占猪牛鸡向环境排放总磷量的21.3%。还对未来畜禽发展规模以及降低污染提出了一些建议。

 
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