## Materials and Methods  
The thermosetting resin used in this work is a urea formaldehyde powder polymer, commercialized by Sadepan (Mantova, Italy) as SADECOL P 100N. It is supplied as fine powder/granules with a defined grain size and a viscosity of 60 \(\div\) 130 mPa-s at 20 \({}^{\circ}\)C.  
The matrix was also enriched with the adding of a proper catalyst (Fast sad SD 10, supplied by Sadepan, Mantova, Italy) in a proportion of 20% wt over the total amount of the UF resin.  
The OFMSW is made of unsorted food wastes collected according to the standard Italian regulation; in particular, the OFMSW was collected from a local restaurant, and apart from food wastes, it contains small amounts (less than 0.5% in weight) of different soft wastes, such as tissues or napkins. Once collected, the OFMSW was grounded by using the Electrolux EGO23000x shredder. The sterilization assessed and optimized in a previous paper [1] consists in a thermal treatment at 120 \({}^{\circ}\)C for 20 min.  
Different blends of the UF and OFMSW (Table 1) were produced by varying the amount of catalyst and by adding different percentages of recycled additives, such as coffee powder, sawdust and sodium bicarbonate, with the aim to reduce the odors and to evaluate the effect of the additives on the curing process and on the mechanical properties. The water content, studied in previous work [1], was necessary for allowing the curing process of the soluble urea formaldehyde-based resin.  
The dried OFMSW, water, UF resin, and additives were mixed at room temperature by means of a mechanical stirrer in order to produce a homogenous slurry that was poured into silicon molds and put in a static oven at 60 \({}^{\circ}\)C for the time necessary to complete the cure reaction (i.e.,1 h).  
Rheological analyses were carried out with a Rheometrics Ares rheometer. Dynamic tests were performed on each formulation of Table 1, in order to assess the optimal curing process conditions. A double plate geometry was used, setting a gap of 0.3 mm, constant oscillatory amplitude (1%) and frequency (1 Hz). The tests consisted of a temperature ramp from room temperature to 140 \({}^{\circ}\)C. A subsequent isothermal rheological test was also performed at the cure temperature selected from the first dynamic scan.  
Compression tests [25] were performed on cylindrical UF/OFMSW samples (D = 60 mm, t = 20 mm) obtained after the curing process as detailed below, using a Lloyd LR5K and a crosshead speed of 1.5 mm/min. A load cell equal to 5 KN was employed. For each sample, six replicates were performed. From the stress-strain curves the strength at break, \(\alpha\)R (MPa), the strain at break, \(\varepsilon\), and the elastic modulus, E (MPa), were evaluated.  
Density measurements were carried out by using a pycnometer.  
Density and compression tests were performed on dried samples, held at 60 \({}^{\circ}\)C the time necessary for two successive weighting of the samples, performed at 24 h intervals, difference less than 0.1%, according to the definition of UNI EN 826.  
Finally, an optical microscope (Zeiss AXIO-LINKAM) was used to analyze the P100N based cured samples with and without additives. Images of all samples were obtained with a 50\(\times\) magnification; afterwards, the average diameter of the pores was calculated by using the DinoCapture software.