Survey on solid wastes management by composting: Optimization of key process parameters for biofertilizer synthesis from agro wastes using response surface methodology (RSM)

Investigation of the influence of biofertilizer synthesized using microbial inoculums on the growth performance of two agricultural crops

“…Lenox et al [ 24 ] reported a cellulose concentration of 53 % and suggested that high resistant to biodegradation by sawdust was due to its high cellulose and lignin content. The initial contents of nitrogen in the sewage sludge (5.16 %), Chicken litter (4.96 %) and vegetable waste (5.9 %) were in conformity with what was presented by Harir et al [ 25 ] and Asadu et al [ 26 ] with the same organic wastes and suggested that the percentages were sufficiently high to maintain the microbial growth for biodegradation during composting. High concentration of organic matter in all the wastes sludge confirms that they are biodegradable and good substrates for production of biofertilizer.…”

Application of response surface methodology in optimizing the process conditions for the regeneration of used mobil oil using different kinds of acids

“…Another important parameter contained in Table 10 is the coefficient of variation, abbreviated as C.V. Chen et al., (2011) defined it as a measure of the repeatability and reproducibility of the models. It could also be described as the ratio of the standard deviation of the estimate to the mean value of the observed response ( Asadu et al., 2019 ). According to Chen et al.…”

“…They show how the independent and dependent variables interact with each other. These can be plotted by keeping one variable at its null point, while carefully varying the other two variables within experimental range ( Asadu et al., 2019 ). Figure 10 (a, b and c) depict how temperature and acid concentration (AB), temperature and time (AC) and acid concentration and time (BC) affects the purity of the oil respectively.…”

“…The other important components are the constraints and the variables. Also, we know that problems involving optimization could be linear, non-linear, geometric or quadratic ( Asadu et al., 2019 ). In this study, these process conditions were optimized using central composite design (CCD) of response surface methodology (RSM).…”

From Anaerobic to Aerobic Treatment: Upcycling of Digestate as a Moisturizing Agent for in-vessel Composting Process

“…However, the opportunity to use the different types of organic waste as compost requires scienti c studies that endorse it to guide users concerning the aspects behind the better management of the composting operation. In conjunction with the quantitative and life cycle-based evaluations, a comprehensive technical-scienti c view of bio-waste composting should also include increasing the currently limited knowledge of the process performance in terms of monitoring and controlling the crucial factors affecting the e ciency of the composting units (Asadu et al, 2019;Chaher et al, 2020a). In this context, Moisture content (MC) is a critical factor in the composting process.…”