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nf treatment
相关语句
  nf处理
     THE STUDY OF POSSIBILITY OF UF AND NF TREATMENT OF FERMENTATION WASTEWATER
     UF、NF处理酵母废水可行性研究
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  相似匹配句对
     L. P. treatment.
     L. P.
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     NF?
     NF?
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     Study of NF-κB in Treatment of Heart Failure
     核因子-κB在心力衰竭治疗中的研究进展
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     NF MEMBRANE TREATMENT FOR HIGH QUALITY DRINKING WATER
     纳滤膜处理优质饮用水
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     c)NF contows.
     (3)NF图;
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  nf treatment
Nikita and Ailsa Craig also showed fruit quality changes in the NF treatment.
      
A decreased ripeness rate was detected in all cultivars in NF+ and in three cultivars in the NF treatment (Nikita, Moneymaker and Piedmont).
      
Crop production showed generalized reductions in the total number of ripe and unripe fruits in the NF+ treatment (53-73%), with Nikita presenting a 24% decrease in the total number of ripe fruits in the NF treatment as well.
      
The sensitive cultivar Nikita also decreased its aboveground dry biomass (28%) at the end of crop cultivation in the NF treatment.
      
All cultivars showed a reduction of root biomass in the NF+ treatment, root-biomass reductions were also observed in the NF treatment in Nikita (29%) and UC 82?L (33%).
      
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In order to get superior drinking warer, tap water was treated respectively by reverse osmosis (Ro) and nanofitrations (NF) in the laboratory. The Ames test results showed that both RO and NF could convert mutagenicity form positive to negative, while the ions removal effec ts of the RO and NF membranes are different, the removal rate of one- valence positive ione (Na+、K+ ) by NF is tenpercent lower than that by RO, the removal rate of two valence positive ione (Ca2+ 、Mg2+)is a litle...

In order to get superior drinking warer, tap water was treated respectively by reverse osmosis (Ro) and nanofitrations (NF) in the laboratory. The Ames test results showed that both RO and NF could convert mutagenicity form positive to negative, while the ions removal effec ts of the RO and NF membranes are different, the removal rate of one- valence positive ione (Na+、K+ ) by NF is tenpercent lower than that by RO, the removal rate of two valence positive ione (Ca2+ 、Mg2+)is a litle lower than that by RO. NF treatment has advantages of high output and low energy consumption to get water of excellent quality.

以自来水为原水,采用反渗透(RO)和纳滤(NF)进行深度处理试验研究.结果装明:RO和NF均能使Ames试验呈阳性的水转变为阴性,NF对一价阳离子(K+、Na+)的去除率略低于RO,NF比RO能多保留一些离子,并且NF具有产水量大,能耗低的优点.

To minimize the loss and residual rate of soil NO - 3-N, the rate, time and method of nitrogen fertilization must be fitted to the crop needs and uptake capacity. Therefore, the spatio-temporal variations of soil NO - 3-N and apparent budget of soil N in summer maize were studied under different nitrogen fertilizer (Nf) level. A field trail was conducted at Wuqiao Research Station, Wuqiao county, Hebei province in 1998. The experiment was laid out in a split-plot design, 5 doses of nitrogen were in...

To minimize the loss and residual rate of soil NO - 3-N, the rate, time and method of nitrogen fertilization must be fitted to the crop needs and uptake capacity. Therefore, the spatio-temporal variations of soil NO - 3-N and apparent budget of soil N in summer maize were studied under different nitrogen fertilizer (Nf) level. A field trail was conducted at Wuqiao Research Station, Wuqiao county, Hebei province in 1998. The experiment was laid out in a split-plot design, 5 doses of nitrogen were in the main plot and 6 genotypes were represented in the subplot with three replications. The 5 doses of nitrogen were 0, 112.5, 250, 337.5 and 450 kg/hm 2, and the 6 genotypes were Tangkang5, Yedan22, Luyuandan14, Danyu13, Nongda108 and Nongda 3315 (the former three are the type of erectophile, plant density is 72 000 plants/hm 2; the later three are the type of planophile, plant density is 57 000 plants/hm 2). The soil texture is a salted light loam soil but which turns clammy at deeper layer (about 130~170cm) and is a fine sandy loam soil at the layer of 170~200cm depth. Nf was divided as 2 split applications (40% at sowing + 60% at 9-leaf expanded, by side-dressing). 103.5kg P 2O 5/hm 2, 162.7kg K 2O/hm 2 and 30kg ZnSO 4/hm 2 were applied at sowing. At pre-sowing the field was irrigated, but there no irrigations during summer maize growth period because of the 2 rainfalls in July (516mm, was mainly composed of 2 heavy rainfalls) and August (118mm). Soil samples were obtained from all plots at 4 growth stages [sowing, 9-leaf expanded (before fertilization), silking and harvest] in 20cm increments to a depth of 100cm. Mixing samples of multi-boring per plot were taken with a soil auger and the sample was frozen immediately. The determination steps of soil mineral N (i.e. N min , including NO - 3-N and NH + 4-N) as follows: defrosted→mixed the sample fully and then sifted it with a 2mm-sieve→10g of each sample were extracted with 0.1L of 0.01mol/L CaCl 2 on a horizontal shaker for 0.5 hour→filtered→N min were determined using an auto analyzer (TRAACS2000). At the same time soil water content of each sample was determined, too. Plant samples were taken three times (at 9-leaf expanded, silking and harvest stage). All the samples were killed at 105℃ for 0.5 hour and dried at 70℃. Total plant N was analyzed by the Kjeldahl digestion method. The estimating method of apparent budget of soil N (ABSN): after reviewed relevant studies, Zhu Zhao-Liang showed that the increment of mineralized soil N after fertilization is approximately equal to the biological fixed rate of fertilizer N. So based on the assumption, the calculating formula of ABSN as follows: ABSN=(Total amount of original N min +Rate of applied N+Rate of mineralized N)- (Total amount of residual N min +Rate of uptake N by crop+Rate of fixed N) =(Total amount of original N min +Rate of applied N)-(Total amount of residual N min + Rate of uptake N by crop) The results of soil N min indicated, during the growth period of summer maize the difference of soil NH + 4-N content among soil layers was smaller under different Nf level, while the change of soil NO - 3-N content(SNC) was very distinct, so only the spatio-temporal variations of soil NO - 3-N was discussed here. At sowing SNC was maximum at the top layer, then decreased following soil depth deepened, and was minimum at the layer of 40~60cm depth, afterward, the SNC increased again following soil depth deepened further. The further results indicated, in 0~100cm depth soil SNC was lower in the middle layer and in the upper or lower layer was higher during summer maize growth period. Generally, in the top layer SNC was the highest, but rain strongly influenced soil NO - 3-N movement, i.e. SNC. It was about at elongation stage there were two violent rainfalls, as a results, at 9-leaf expanded in the highest Nf treatment the SNC in the layer of 80~100cm depth increased significantly compared with at sowing and was higher than the top layer. Me

在不同氮肥用量下研究了夏玉米生育期间土壤硝态氮的时空变化特征 ,同时对不同生育阶段土壤氮素的盈余与亏缺进行了表观估算 ,结果表明 :0~ 1 0 0 cm土体内 ,夏玉米一生中土壤硝态氮均表现为在中间土层含量低 ,上层和下层含量高 ,一般以表层最高 ,但受降雨的影响在高氮肥处理会出现下层高于表层的现象。施氮肥提高了土壤硝态氮含量 ,而且提高程度与用量成正相关。降雨时土壤硝态氮可随水下移 ,在干旱条件下也可随水上移。土壤硝态氮的运移不仅受土壤水分状况的影响 ,还取决于硝态氮含量 ,含量越高 ,向下移动的越深 ,淋失的可能性越大 ;在本试验条件下 ,土壤氮素盈余主要出现在夏玉米播种~ 9叶展和 9叶展~吐丝两个生育阶段 ,吐丝~收获则出现土壤氮素的亏缺。随着氮肥用量的增加 ,玉米一生中土壤氮素的表观盈余量明显增大 ,最高平均可达 2 74 .1 kg N/hm2。研究结果表明 ,土壤氮损失是盈余氮素的一个主要去向 ,而硝态氮淋洗是夏玉米生育期间土壤氮素损失的一个重要途径。

Integreated treatment of micro-eddy flocculation (MEF), counter current dissolved air flotation (CCDAF) and nanofiltration (NF) was performed on three influents-tapwater spiked with humic acid at 5 mg/L, 10 mg/L and 10 mg/L+5 mg/L of Gaolin clay. After 72 hours of continuous operation, the treatment was interrupted for washing of the NF unit membrane to restore it original flux. The MEF-CCDAF-NF treatment effectively removed humic acid with much better TDS removal achieved using...

Integreated treatment of micro-eddy flocculation (MEF), counter current dissolved air flotation (CCDAF) and nanofiltration (NF) was performed on three influents-tapwater spiked with humic acid at 5 mg/L, 10 mg/L and 10 mg/L+5 mg/L of Gaolin clay. After 72 hours of continuous operation, the treatment was interrupted for washing of the NF unit membrane to restore it original flux. The MEF-CCDAF-NF treatment effectively removed humic acid with much better TDS removal achieved using TQ56-36FC NF (Omnipure Filter Company) than M-N1812A NF (Applied Membranes INC). The use of PACl flocculant helped to maintain the excellent treatment performance following a significant change in the feed composition. Some inorganic constituents of the NF feed were responsible for the membrane fouling since the flux reduction was not altered by the additional pretreatment of the NF feed by carbon adsorption for removing most of its organic constituents.

通过微涡旋絮凝—逆流气浮—纳滤集成工艺的动态试验研究,确定其运行周期为72h,能很好地去除水中腐殖酸有机物,但不同纳滤膜组成的集成工艺处理效果不同。采用PACl絮凝剂处理水样2时,以流程1运行的含TQ5636FC型纳滤膜的集成工艺出水的高锰酸盐指数为0.45mg/L,UV254nm在0.0033左右波动,且有95%以上的脱盐率。以流程2运行的含MN1812A型纳滤膜的集成工艺处理3种水样时的膜清水的高锰酸盐指数在0.75mg/L左右波动,UV254nm大都远小于0.0075,有时甚至为0。水样1和水样3的UV254nm平均值为0.0054,水样2的最低,平均值为0.0033,脱盐率只有6%~10%。以PACl为絮凝剂时,集成系统有较强的适应原水水质变化的能力。预处理中活性炭柱的存在提高了MN1812A型纳滤膜清水样的水质,但并没有延长膜的使用周期。这也表明膜的污染更重要的是来自无机物的污染。

 
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