nitrification rate of biofilters is influenced by ammonia concentration and levels of ammonia vary in response to feeding time. on the other hand, existence and activity of different groups of bacteria can be expected in the biofilters. hence in this research, nitrification dynamic of biofilters during day hours and also rules of different biofilteration process (nitrification, denitrification ...

Secondary-treated municipal wastewater (MWW) is a promising alternative to freshwater as power plant cooling system makeup water, especially in arid regions. A prominent challenge for the successful use of MWW for cooling is potentially severe mineral deposition (scaling) on pipe surfaces. In this study, theoretical, laboratory, and field work was conducted to evaluate the mineral deposition po...

The blocking protocols of "stopping service" and of "recirculating" jobs through an entire system are shown to be equivalent for Jacksonian queueing networks with blocked departures. Queueing networks * product-form * stopping and recirculating blocking protocol •* partial balance.

INTRODUCTION Molecular adsorbent recirculating system (MARS) for albumin liver dialysis has been used as a bridge to liver transplantation in patients with fulminant hepatic failure (FHF). This review examines the available data on its clinical use, its technical aspects and present gaps in knowledge. METHODS Peer-reviewed journals and monographs on the subject were covered. RESULTS FHF is ...

A composite model was developed for water and mineral relations of greenhouse tomato (Solanum lycopersicum L.) cultivated in semi-closed or open soilless (rockwool) culture. The model simulated on a daily basis: (i) the evolution of crop leaf area index and water uptake using empirical equations; and (ii) the variations of ion concentrations and electrical conductivity (EC) in the recirculating...

Recirculating aquaculture systems may require an internal disinfection process to control population growth of pathogens and heterotrophic bacteria. Ozonation and ultraviolet (UV) irradiation are two technologies that have been used to treat relatively large aquaculture flows, including flows within freshwater systems that recirculate water. The objective of the present study was to evaluate th...

Intensive aquaculture in recirculating systems is rapidly developing, and with it arises the need for reliable treatment systems. To enable reuse of water in these systems, biological treatment is considered the most economically feasible approach. In this review the advantages and disadvantages of some of the most commonly used biological treatment systems are examined. Using as a comparator t...

Abstract Good water quality in recirculating aquaculture systems (RAS) is crucial for ensuring the successful growth and survival of reared species. So far, there are no regulations which parameters should be measured RAS, each farmer decides to follow. Traditionally, have been at certain intervals with handheld sensors laboratory analyses, can labour intensive. Currently, a variety monitoring ...

Abstract The use of recirculating aquaculture system (RAS) in nurseries cantik grouper ( Epinephelus fuscoguttatus × microdon ) has the potential to make culture environment more stable and maximize production perfomance, but work RAS decreases with accumulation waste water used. Remediation microorganisms (bioremediation) can improve performance RAS. This research aims determine best dose comm...