Experimental Study on Wastewater Treatment of Expressway Service Area in BAF
The removal effect of main pollutant which was in the wastewater of expressway service area was investigated in the up-flow biological aerated filter (UBAF) with different hydraulic loadings. The result showed that with the increase of hydraulic loading, the removal rates of the chemical oxygen demand (COD) and turbidity decreased. At hydraulic loading of 0.5 m3/(m2&#x2022;h), removal rates of COD and turbidity were 79.6% and 80.2% respectively, which were better than that of 56.5% and 48.7% at hydraulic loading of 1.25 m3/(m2&#x2022;h).
Discussion on the Environmental Supervision During the Construction of Communication Projects
Though discussion on the method of the environmental supervision during the construction of communication projects,the meaning,program,contents and working methods of the environmental supervision is expounded.
Differences in the length of initial hospital stay in very preterm infants
Aim: To investigate the effect of maternal, infant and birth hospital district related factors on the length of initial hospital stay in very preterm infants. In addition, rehospitalization rate within the first year from the initial discharge was studied.