Bichos

In recent years, due to expanding populations and industries, regulatory authorities have imposed tighter discharge limits on nutrients from wastewater treatment facilities to avoid eutrophication in water streams. Common methods, such as metal salt precipitation, are being used to lower phosphorus concentrations which are a main contribution. However, alternate phosphorus removal techniques, such as phosphorus crystallisation, can provide further benefits. Precipitated solid can be utilised as a marketable fertiliser. Principles of magnesium and ammonia phosphate precipitation, working with...

Resume las investigaciones realizadas en esta zona de Ovalle, respecto de bellos petroglifos, realizados por culturas precolombinas. Con muchas fotografías a todo color.

The FAO Yearbook of Fishery and Aquaculture Statistics contains all the most updated data on capture production, aquaculture production and commodities. In this new presentation, the complete yearbook package for each of these categories - all the key information and statistical tables - are contained on one CD-ROM, inserted in a booklet that includes general notes, concepts and classifications, and summary tables as well as a pull-out map of FAO major fishing areas. . From the CD-ROM, you can download, consult, share and store all the data previously provided in print only. This volume...

¿Tienes ganas de vivir en un entorno limpio y sano, incluso desde un punto de vista medioambiental? Este libro está hecho para ti. La contaminación doméstica es en gran medida la responsable de los gases de efecto invernadero y está en el origen de alergias, dolores de cabeza y de infecciones respiratorias. Nathalie Boisseau nos propone diferentes recetas baratas y fáciles de realizar, para cada estancia de la casa. Elaboradas a base de sustancias naturales y biodegradables, nos permitirán limpiar eficazmente la casa de suelo a techo, incluida la ropa y la vajilla, alejando...