Slow sand filters (SSF) are a simple water treatment technology providing an important alternative to conventional drinking treatment. SSF extensive in terms of carbon cost and chemical use but require large land area complex operate, as periodic cleaning is required prevent filter clogging. Therefore, redundant beds enable production occur during long downtimes. Underwater skimming (UWS) innov...

During the last decade, more stringent effluent requirements concerning the nutrients effluent values have been imposed by legislation and social concern. In this study, efficiency of total nitrogen removal in activated sludge and trickling filter processes (AS/TF) was investigated in Tehran North wastewater treatment plant. Biological system in this site was included, anoxic selector tank, aer...

in this research, the effect of friction between the liquid metal and the sand mould wall and the effect of passage of liquid through a vertical bend and through a ceramic filter on the fluid flow and the melt velocity has been studied by measuring the velocity of the melt and direct observation of the liquid flow through the different parts of a naturally-pressurized running system. the fricti...

A propeller-wash bead filter (PWBF) and a fluidized sand filter (FSF) on a 28 m recirculating system stocked with tilapia maintained favorablewater quality at five different feed rates, ranging from 0.9 to 4.5 kg feed per day. TAN removal rates ranged up to about 200 g TAN/m of media per day for each of the units. Peak rates of 244 g TAN/m of media per day were observed when the recirculating f...

A polychaete-assisted sand filter (PASF) can aid water recirculation systems for shrimp culture ponds by removing large amounts of nutrients and suspended solids chemically treating wastewater. By ingesting degrading organic matter, Perinereis helleri polychaetes reared in a PASF accumulate potentially remove infectious hypodermal hematopoietic necrosis virus (IHHNV) present wastewater from rea...

A next generation septic tank media filter to replace or enhance the current on-site wastewater treatment drainfields was proposed in this study. Unit operation with known treatment efficiencies, flow pattern identification, and system dynamics modeling was cohesively concatenated in order to prove the concept of a newly developed media filter. A multicompartmental model addressing system dynam...