The purpose of this study was to investigate the nitrification and nitrogen removal from centrate produced in the dewatering process of anaerobically digested sludge, using a single-unit, single-zone submerged attached-growth bioreactor. The nitrogen loading varied from 0.54 to 1.51 kg-N/m3 x d. Stable ammonia oxidation (nitritification) to nitrite was demonstrated. A nitritification efficiency...

The issue of tracking residual stresses initiation in welding copper under various affected conditions is essential increasing safety through improving the quality particular, nuclear industry. This study investigated behavior welded numerically and experimentally contact-heating compression test with constant clamping force. scanning contact potentiometry (SCP) method was used to track develop...

In an attempt to reduce the threat of global warming, it has been proposed that the rise of atmospheric carbon dioxide concentrations be reduced by the ocean disposal of CO2 from the flue gases of fossil fuel-fired power plants. The release of large amounts of CO2 into mid or deep ocean waters will result in large plumes of acidified seawater with pH values ranging from 6 to 8. In an effort to ...

To combine the processes of gas nitriding and oxidation in water vapor, effects atmospheric nitrogen potential dissociated ammonia on formation surface diffusion nitride phases are studied. Modification layer with oxygen was carried out by zone at second stage obtaining an oxycarbonitride layer. The corrosion wear-resistant properties nitride-oxide t lowest investigated, depending phase changes...

Earthen waste lagoons are commonly used to store liquid wastes from concentrated animal feeding operations. The fate of ammonium (NH) and nitrate (NO) was studied in the vadose zone below earthen-clay dairy farm waste lagoons using three independent vadose zone monitoring systems. The vadose zone was monitored from 0.5 to 30 m below land surface through direct sampling of the sediment porewater...