N removal

Semiconductor control modules gate the thyristors, which switch cm rent to the motor field at the optimum motor speed and precise phase angle. This assures synchronizing with minimum system disturbance. On pull-out, the discharge resistor is reapplied and excitation is removed k> provide protection to the rotor winding, shaft, and external electrical system. The control resynchronizes the motor after the cause of pull-out i.n removed, if sufficient torque is available. The field is automatically applied if the motor synchronizes on reluctance torque. The control is calibrated at the factory and no field adjustment is required. The opti-... 

Wollheim WM, Peterson BJ, Thomas SM, Hopkinson CH, Vorosmarty CJ (2008) Dynamics of N removal over aimual time periods in a suburban river network. J Geophys Res 113 G03038. doi 10.1029/2007JG000660... 

As reported, the effluent of the first anaerobic UASB reactor (Runl) was used as the influent of the second UASB reactor (Run2), and the effluent of the second UASB reactor was used for the influent of the aerobic CSTR reactor (Run3). COD removal efficiencies for the first UASB reactor and in the whole system (two-step UASB + CSTR) were 58%, 62%, 65%, 72%, 74%, 79%, and 96%, 96.8%, 97.3%, 98%, 98%, and 98%, respectively. As the OLR increased from 4.3 to 16kg/m3/d, the COD removal efficiency reached a maximum of 80%. NH4-N removal efficiency was ca. 99.6% after the aerobic stage. The maximum methane percentages of the first and second UASB reactors were 64% and 43%, respectively. 

The methane content of the first UASB reactor was ca. 60%. The NH4-N removal efficiency of the total system was 99.6%. Ammonium nitrogen was converted to nitrate in the aerobic system via nitrification. The BOD5/COD value obtained at the final stage was in the range 0.12 to 0.15. 

None. Involved plasmids identified as 225- and 250-kb Complete degradation of QN and Me-QN but no reaction of iso-QN, indole and pyridine. 100% conv. QN, but < 10% N-removal from oil... 

P. fluorescence N1 [370] Ronald Atlas US None. Involved < 10% N-removal from oil. Selective to N-nitriles. 

P. ayucida IGTN9m (ATCC PTA-806) Gram (—) [371] J. J. Kilbane US Patents 6, 204, 408 None Shale oil 5% N-removal, 68% quinoline conversion. 

Jonassen, N., Radon Daughter Levels in Indoor Air, Effects of Filtration and Circulation, Progress Report VIII, Laboratory of Applied Physics I, Technical University of Denmark, (1985). Jonassen, N., Removal of Radon Daughters from Indoor Air, ASHRAE-transactions, 91, part 2, (1986). 

Run No. Stage Temperature CC) Time (hr) Initial pressure (MPa) Reaction pressure (MPa) Catalyst (g) Solvent N removal (%)... 

Terrestrial assimilation is a major form of N removal in watersheds and may be sufficient to prevent all atmospherically derived N from reaching surface waters (19). 

Even when all matter and heat radiation have be n removed from a region of space, the vacuum of classical physics remains filled with a distinctive pattern of electromagnetic fields, The discovery of a connection between thermal radiation and the structure of the classical vacuum reveals... 

A review3 with 69 references was published in 1979 by Katzer and Sivasubramanian where the industrial aspect from a North American economic point of view has been emphasized. Shah and Cronauer4 and Gavin68d have reviewed the O, N, and S removal reactions in coal liquefaction, where the part concerning N removal was elegantly summarized. However a more fundamental examination emphasizing the mechanistic and kinetic aspects of the reaction seems necessary, because much work on these aspects has been described in the literature since 1979. Economic and industrial aspects will however also be reviewed. 

Venkataswamy, Y. Chandra, D. Chakrabarty, 0. N. "Removal of sulphur from Indian coals by sodiun hydroxide leaching," J. 

Coastal system DIN Total N Denitrification Percentage of DIN removed by denitrification Percentage of total N removed by denitrification Residence time3 (months) Noteb... 

The UV spectra of the coloured aryl-substituted alkylidenecycloproparenes show long-wavelength absorption maxima, the positions of which are solvent dependent and in accord with the measured polarities (Table 4, Section n Removal of the... 

Figure 4 shows the result of using Ru-TiOjiS to treat the simulated wastewater succinic acid in a 200L/d continuous reactor under different conditions. When the water ran at a speed of 4L/h and the content is 20%, the COD and NHj-N removal rate increases with temperature and pressure. When the temperature is down to 200 °C, the COD removal is nearly zero. However, the NH3-N can be partly removed. This may indicate that 200 C is an activating temperature for the catalyst Ru/TiOjiS. The reaction speed is greatly influenced by temperature. When the temperature increases to 250 °C, at 7.0MPa, the COD removal rate is greater than 99% and the NH3-N removal rate reaches... 

In this work, a coking wastewater was treated in a continuous reactor using Ru/TiOjiS. The results of one month running are shown in Figure 5. The reactions proceed at 250°C, 7.0MPa, Oj content 20%, water speed 4L/h, 30min. The COD removal rate remained greater than 99% and the NHj-N removal rate was nearly 100%. 

The Ru/Ti02 catalyst prepared in our laboratory shows high catalytic activity in CWO of succinic acid solution. It retains a COD removal rate greater than 99% and an NHj-N removal rate close to 100% in the treatment of coking wastewater. The catalyst is stable for long time running. 

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