Modelling Escherichia coli concentration in a wastewater reservoir using an operational parameter MRT%FE and first order kinetics.

The operational parameter MRT%FE, representing the mean residence time of different ages fractions of effluent within a completely mixed reactor, was evaluated and integrated with first order kinetics. The parameter was used to model Escherichia coli concentrations in a municipal wastewater reservoir managed under different operating conditions (continuous and discontinuous). The study was conducted during 2004-2005 in a reservoir receiving effluents from the activated sludge treatment plant of Caltagirone (Eastern Sicily - Italy).

A single 24F Blake drain after wedge resection or lobectomy: a study on 100 consecutive cases.

Objective: To evaluate the results of chest drainage using one 24F Blake drain after standard thoracic operations (wedge resection and lobectomy).

Methods: In 2005, 100 consecutive patients underwent drainage of their pleural cavity following lobectomy or wedge resection(s). There were 70 men and 30 women, with a mean age of 55 years (17-83).

Semi-intensive treatment plants for wastewater reuse in irrigation.

Semi-intensive technologies are a middle term between intensive ones (e.g., activated sludge with a retention time of hours) and extensive ones (e.

Salt reduction in municipal sewage allocated for reuse: the outcome of a new policy in Israel.

Israel is presently reusing about 70% of its sewage and the buildup of salts in soils has been detected in some areas of the country. Prevention of sewage salt enrichment is one of the most immediately available solutions. The discharge of brines to municipal sewers is now prohibited and they are discharged to the sea.