Nitrogen removal efficiency is significantly influenced by nitrogen form, and total nitrogen removal efficiency is high for the sewage with high proportion of nitrate nitrogen.
人工湿地进水氮形态不同显著影响湿地脱氮效果，较高的氧化态氮比例有利于总氮去除。
A second benefit of nitrate nitrogen is shorter, toned growth.
第二个好处就是硝态氮可使植株矮小且强壮。
The final reduction product of nitrate nitrogen is ammonia nitrogen.
硝酸盐氮的最终还原产物为氨氮。
Some commercial laboratories use periodic nitrate nitrogen tests as guides .
许多商业性的试验室已应用定期的硝态氮分析作为指导。
Neither ammonium nitrogen nor nitrate nitrogen with high concentration in the medium helped to the growth of bacteria.
培养基中高浓度的氮不论是铵态氮还是硝态氮均不利于菌株的生长；
A biomembrane packed bed reactor with sulfur and limestone as solid filling material for removal of nitrate nitrogen was studied.
研究了装填固体填料硫和石灰石的生物膜反应器对水中硝酸盐氮的去除。
Due to low ap-parent activation energy for reduction of nitrate nitrogen by NZVI, the reduction reaction can be per-formed at normal temperature.
纳米铁还原硝酸盐氮的表观活化能较低，还原反应在常温下即很容易进行；
At the same time, the efficiency of COD removal was 87.24%, which demonstrates the coinstantaneous removing of both organic and nitrate nitrogen.
COD的平均去除率为87.24％，基本实现了同一反应器中有机物和硝酸盐的共同去除。
Biological tests show that both fertilizers are helpful to improve lawn quality, reduce nitrate nitrogen leaching loss and raise fertilizers utilization rate.
生物试验表明：两种肥料有利于草坪质量的提高，减少土壤中硝态氮的淋失，提高肥料的利用率。
With the same irrigation amount, the increasing of nitrate nitrogen content both in the soil and groundwater has the polynomial correlation with groundwater table.
灌水量相同时，土壤中硝态氮增加量和地下水中硝态氮的增量与地下水埋深成多项式关系。
The measurement of nitrate nitrogen and nitrite nitrogen in seawater has such disadvantages as many disturbing components, long time, poor repeatability and accuracy.
水体中尤其是海水中硝酸盐氮的测定较繁琐，干扰物质多，分析时间长，重现性差，准确性不高。
Coupling effects of water and fertilizers on translocation of nitrate nitrogen in protected land were studied with the design of quadratic orthogonal rotational combinations.
采用二次回归正交旋转组合设计，研究了水肥耦合效应对保护地土壤硝态氮运移的影响。
The dissolved nitrogen (DIN) concentrations in the Wujiang River basin were much higher than the global average values and the main form of nitrogen was nitrate nitrogen (NO3-N).
乌江流域溶解无机氮含量较世界平均水平高，其主要存在形式为硝态氮（NO_3-N）。
This paper reports the effect of DCD in seedling stage to soil microorganism of bacteria, mold and actinomycetes, and the concentration changes of both ammonium nitrogen and nitrate nitrogen in soil.
实验研究了双氰胺在玉米苗期对土壤微生物细菌、霉菌和放线菌的影响，及对土壤中铵态氮和硝态氮贮量变化的影响。
Nitrate nitrogen removal from ground water by autotrophic denitrification in a packed bed reactor.
固定床自养反硝化去除地下水中的硝酸盐氮。
Nitrate nitrogen removal from ground water by autotroph IC denitrification in a packed bed reactor.
固定床自养反硝化去除地下水中的硝酸盐氮。
An experiment in field and artificial penetration-filter pond test both were conducted to show factors affecting content of nitrate-nitrogen in soil in the present study.
采用田间试验及人工渗滤池试验方法，研究了土壤中硝态氮含量的影响因素。
Methods Porous ceramics were used as immobilization carrier. Optimum conditions for nitrate-nitrogen removal of downflow fixed-bed bioreactor were studied.
方法采用多孔陶粒作反硝化细菌固定化载体，研究下流式固定床生物反应器的适宜脱氮条件；
Methods Porous ceramics were used as immobilization carrier. Optimum conditions for nitrate-nitrogen removal of downflow fixed-bed bioreactor were studied.
方法采用多孔陶粒作反硝化细菌固定化载体，研究下流式固定床生物反应器的适宜脱氮条件；
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