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effluent
Quantitative analysis of nicotinic acid, nicotinamide and 3-cyanopyridine in industrial effluent by high performance liquid chro
      
A rapid and reliable high performance liquid chromatographic (HPLC) method for the simultaneous determination of heterocyclic compounds, namely nicotinic acid, nicotinamide, and 3-cyanopyridine, in industrial effluent is described.
      
This method is rapid, sensitive and suitable for the monitoring of nicotinic acid, nicotinamide, and 3-cyanopyridine in effluent of related pharmaceutical manufacturing plants.
      
Under deficient influent alkalinity, when compared to OAA, the AAA process improved treatment efficiency and effluent quality with NH4+-N in the effluent below the detection limit.
      
Applying the control strategy water quality of the effluent could stably meet the national first discharge standard during experiment of 10 months.
      
Even at low temperature (t = 13°C), chemical oxygen demand (COD) and total nitrogen (TN) in the effluent were under 50 and 5 mg/L, respectively.
      
However, there was not much difference between these two kinds of sludge in terms of the total phosphorus uptake quantity and the effluent quality.
      
The results showed that NPEOs and its metabolites existed in all the samples of the influent, effluent, and sludge.
      
Hence, the concentrations of some small metabolites, such as nonylphenol (NP), nonylphenol monoethoxylate (NP1EO), and nonylphenol diethoxylate (NP2EO) were elevated in the effluent.
      
Volumetric loads of TN dropped dramatically and effluent TN concentration increased quickly when the concentration of average dissolved oxygen was more than 4.0 mg/L.
      
The influent concentration hardly affected the TN removal efficiency, but the effluent TN increased with increasing influent concentration.
      
It is suggested that a subsequence for denitrification be added or influent amount be decreased to meet effluent quality requirements.
      
The backwash of low density and long duration lowered particle number in the effluent.
      
The MPN of activated carbon fines in the effluent was between 400 and 600 CNT/L, which accounted for less than 5‰ of the total particles from activated carbon filtration for a poor relative level (R2 = 0.34).
      
The microorganisms in activated carbon effluent consisted mostly of heterotrophic bacillus and the total bacteria number was five times as high as that of the inflow, i.e.
      
The experimental results demonstrated that the effluent total nitrogen can be reduced to lower than 2 mg/L, and the average total nitrogen (TN) removal efficiency was higher than 98% by using real-time controll strategy.
      
Effect of rarefaction on the flow past a body with an effluent jet
      
The flow rate was 1 mL min-1 and the effluent was monitored at 270 nm pH 4.0.
      
The effluent water temperature ranged from 72 to 74°C, pH was from 9.25 to 9.8, and sulfide content was from 12 to 13.4 mg/ml.
      
The results were applied to decontamination of low-level liquid radioactive waste by filtration through a pot of red pottery; the effluent was free from the radiotracer.
      
 

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