UV–Visible and Fluorescence Green Waste Composts Monitoring: Material Dependency

Abstract

The most frequent way to survey green waste composts is to monitor the temperature during the composting process. However, if the temperature is a good index for global biological processes, it is not for the chemical stability. In order to identify a reliable index, this work investigates water extraction coupled to spectroscopic indexes such as E 2 /E 3 , E 4 /E 6 and SUVA 254 ratios, and fluorescence indexes such as Kalbitz, Milori, CP/PARAFAC and Fluorescence Region Integration. The measurements of these indexes are carried out with six samples from different sites with different green waste material composition. The results show that most indexes depend on the green waste origin more than the composting time; some depend mostly on the material origin while others on compost age. A comparison of these results indicates that the biochemical process occurs more rapidly than expected by the compost producers. The combination of these indicators gives useful information on the processes that take place during composting.

Modelling of impact of presence/absence of suspended particulate organic matter from river and sea and effluent wastewater on fluorescence signal in the coastal area of Gapeau River

“…C2 showed excitation maximum at 375 nm and an emission maximum at 465 nm. This component represents more humificated fluorophores and resembles C2 found in the study of (Abaker et al 2018) and it is of fluvic-like fluorophores Peak A (Coble 1996). C3 excitation/emission peak was located at wavelengths of 295/405nm.…”