heavy metals due to their non biodegradability properties and can accumulate in living tissues, thus becoming concentrated throughout the food chain and can be readily absorbed into the human body. among them manganese was examined in this study as a pollutant. the aim of this study is the manganese removal from aqueous solution using a windy sand fixed bed column of sistan plain. flow rate, in...

Deposits in dam areas of large reservoirs, which are commonly composed fine-grained sediment, important for reservoir operation. Since the impoundment Three Gorges Reservoir (TGR), sedimentation pattern area has been unexpected. An integrated dynamic model consists both sediment transport with water flow and gravity-driven fluid mud at bottom, was proposed. The incipient motion driven by gravit...

Nitrification of ammonia (NH4) is a critical component for improved systems of animal wastewater treatment. One of the most effective processes uses nitrifying microorganisms encapsulated in polymer resins. It is used in Japan in municipal wastewater treatment plants for higher nitrification rates, shorter hydraulic retention times (HRT), and lower aeration treatment cost. We evaluated whether ...

piratory failure may require mechanical ventilation to maintain oxygenation. Persistent hypoxemia may entail additional treatments, such as inhaled nitric oxide or high-frequency oscillation, but these treatments are not universally available. In contrast, ventilation in the prone position, first recommended in 1974, can be readily implemented in any intensive care unit (ICU), and clinicians sh...

Carter, R M, 1975 A discussion and classlfmatlon of subaqueous mass-transport with particular application to gram-flow, slurry-flow, and fluxoturbldltes Earth-Sci Rev, 11 145--177 Sediments will remmn at rest on the sea-floor provided forces of shear resistance exceed the downslope shear stress imposed by gravity The shear resmtance of granular water-saturated sediments IS dmcussed within the c...

In turbulent free-surface flows, the deformation of the surface leads to air bubble entrainment and droplet projections when the turbulent shear stress is greater than the surface tension stress that resists to the interfacial breakup. These complex processes at the water-air interface have been the focus of extensive experimental, numerical and theoretical studies over last two decades and thi...

the down-flow hanging sponge (dhs) reactor, which was developed for post-treatment of effluent from up-flow anaerobic sludge blanket (uasb) process treating sewage, uses polyurethane sponge as media to retain biomass. wastewater is trickled from the top of the reactor and purified by microorganisms retained both inside and outside of the sponge media as the wastewater flows vertically down thro...

The main objective of this study is the modelling and optimization of an industrial Hydrocracker Unit (HU) by means of Adaptive Neuro Fuzzy Inference System (ANFIS) model. In this case, some data were collected from an industrial hydrocracker plant. Inputs of an ANFIS include flow rate of fresh feed and recycle hydrogen, temperature of reactors, mole percentage of H2 and H2S, feed flow rate and...

Gravity drainage is one of the important recovery mechanisms in fractured carbonate and conventional reservoirs. It occurs due to density difference between the gas in fracture and the oil in matrix as well as in conventional tilted reservoirs. Oil phase will form films which are produced under gravity forces (film flow). Many gas injection experiments have been done on laboratory scales with d...