Evaluación físico – química y microbiológica de cuatro niveles de lodos ordinarios en la elaboración de compost

Abstract

The rising generation of sludge in treatment plants is a concern for the Administracion Nacional de Acueductos y Alcantarillados (ANDA), if not handled properly can cause damage to the environment, these sludge have enormous potential for use in organic soil improvement. The research was conducted from November 2011 to August 2012, with the aim of performing a physical - chemical and microbiological compost from four ordinary sludge levels (L) adding plant material (V) and coir as structuring (E) the treatment being as follows: T1 = L = 70%, E = 30%, V = 0%, T2 = L = 60%, E = 30% V = 10%; T3 = L = 50 % E = 30%, V = 20%, T4 = L = 40%, E = 30%, V = 30%, making four replicates per treatment for a total of 16 randomized unit. The physical parameters evaluated were: % ≤ 16mm grain size and % moisture, chemical parameters: pH, electrical conductivity, salinity, nitrogen, phosphorus (P2O5), potassium, organic matter, organic carbon, C/N, microbiological parameters: total and fecal coliforms, Escherichia coli. Salmonella sp., Shigella sp., helminths and protozoa. For the evaluation of the physico-chemical use statistical software Statgraphic 5.0, Applying ANOVA and Duncan by contrasting treatment means, and microbiological parameters were compared with the standard Chilean NCH2880-2003 As Physical - chemical and microbiological composting, treatment is showing better results in T3 using this 50% sludge, 30% and 20% structuring this treatments is recommended for use as soil improver