Abstract

TORRES LOZADA, Patricia; MADERA PARRA, Carlos Arturo  and  MARTINEZ PUENTES, Genny Virginia. ALKALI STABILIZATION OF COMPOSTED BIOSOLIDS FROM DOMESTIC WASTEWATER TREATMEN PLANTS FOR AGRICULTURE PURPOSE. Rev. Fac. Nac. Agron. Medellín [online]. 2008, vol.61, n.1, pp.4432-4444. ISSN 0304-2847.

The limitation for agriculture use of sludge and biosolids from wastewater treatment plants is the microbiological and parasitological quality. Alkali stabilization was evaluated in produced compost from biosolids of Cañaveralejo wastewater treatment plant (PTAR-C), based in Cali, Colombia . Ashes, quick and slake lime were applied to compost. Doses of 8, 15 and 30% of ash and hydrated lime and 15% of quick lime were the concentration (in weight) used; during 13^th days T^oC, pH, humidity, faecal coliforms and helmints eggs were monitored. The results show that for both limes at 15% the pH arise to 12 and keep it for more than 72 hours and helminths eggs were zero, revealing that very good pathogens removal efficiency and met the class A standard, conditions that was not achieve for ash in all evaluated concentrations. Regarding with humidity, quick lime (15%) obtained better performance that hydrated lime, only comparable with 30% valour and required 3 to 5 days for reduce the humidity until 20%, recommendable value for application of compost in agriculture. Is recommendable evaluate ranges between 8 to 15% of quick lime, other type of ashes, mixture between alkali products  in order to improve the performance and reduce of treatments time, area requirements and cost also consider other microbiological indicators for plants and humans as Salmonella and phytopatogenic.

Keywords : Alkali stabilization; ash; biosolids reuse; compost; lime; pathogen reduction.

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