Evidence-Based Implementation of the Family-Centered Model and the Use of Tele-Intervention in Early Childhood Services: A Systematic Review.

Background: The purpose of this review is to explore the evidence and efficacy of two trends in early childhood intervention services: the family-centered model and the use of tele-intervention.

Methods: A systematic review was carried out following the PRISMA methodology and using three databases: Web of Science, PubMed and Scopus. The studies included were those aimed at children from 0 to 6 years of age, focused on early intervention, and which alluded to the family-centered model and/or tele-intervention.

Colour, turbidity and COD removal from old landfill leachate by coagulation-flocculation treatment.

The application of different coagulants and flocculants to leachate from an old landfill to determine the optimum conditions for removal of organic matter, colour and turbidity is studied. Ferric chloride, aluminium sulphate, aluminium polychloride (PAX) and polyacrylamide polyelectrolytes were tested. Higher pollutant removals (73% COD, 98% colour and 100% turbidity) were obtained using ferric chloride at pH 5.

Tertiary treatment of landfill leachates by adsorption.

The leachates produced at the municipal solid waste (MSW) landfill of Asturias (Spain) were submitted to a biological treatment consisting of a pressurized nitrification-denitrification process followed by ultrafiltration. The effluent from this treatment plant has a high chemical oxygen demand : biochemical oxygen demand (COD : BOD( 5)) ratio (about 25 : 1). The COD values of the effluent are above the discharge limits permitted by current legislation and therefore require a final treatment.

Coagulation-flocculation as a pretreatment process at a landfill leachate nitrification-denitrification plant.

The main aim of this research work was to study the possible application of coagulation-flocculation as a pretreatment process for young landfill leachate in order to prevent fouling in the ultrafiltration membranes employed for the separation of biomass in the biological plant. Jar-test experiments were carried out to determine the optimum conditions for the removal of turbidity colour and organic matter. The coagulants ferric chloride, aluminium sulphate and aluminium polychloride (PAX) were tested, along with different types of flocculants (anionic and cationic polyelectrolytes).