The amino acid composition of composts derives in part from the original amino-acid pool of the substrate and in part from extracellular enzymes and cells of the dead and living micro-organisms. Because of their high biodegradability, the relative molar distribution (RMD) of amino-acids in compost depends on a balance between re-synthesis and decomposition and should be related to changes in microbial community. The total amino-acid content increased sharply during the first days of composting fairly as a consequence of weight loss and remained fairly constant up to the 75th day of composting, decreasing thereafter during the curing period to about one half of the maximum value obtained (139 mmol/100g). The RMD shows a decrease in acidic amino-acids and particularly in the content of glutamic acid (11.19% at 7 days and 7.75% at 100 days), with a concomitant increase in cystine (6.85% at 7 days and 10.07% at 100 days) and methionine (8.45% at 7 days and 11.95% at 75 days). Comparison with previous work suggests that changes in RMD are related to process strategies.
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- Changes in the Amino Acid Composition of Grass Cuttings During Turned Pile Composting
M. T. Baca
M. De Nobili
- Springer Netherlands