Nitrogen flow in livestock waste system towards an efficient circular economy in agriculture.

The race is on to achieve an important level of efficiency in the attainment of a circular economy in agriculture especially with the aim of sustainable nitrogen management. This cycle in the agricultural sector cuts across livestock farming, agriculture-induced waste generation, recycling and utilization, energy generation, crop production, ecosystem protection and environmental management through the mitigation of climate changes. In this work, we assess the process and functionalities of livestock waste generated from the piggery farm and their combinations with other by-products such as biochar and ash in comparison with mineral fertilization as sources of nitrogen applied in agricultural soil.

Comparative analysis of the environmental impact of conventional and precision spring wheat fertilization under various meteorological conditions.

Precision farming is being approached with hopes of discovering new decisions that could aid in managing and reducing the environmental impact of farming systems with increasing frequency. Analysis of the results obtained from a five-year research period has revealed no significant difference in the amount of produce received, irrespective of the fertilization technology (variable-rate fertilization (VRF) or conventional fertilization (CF)) used on spring wheat crops. However, in VRF, nitrogen fertilizer consumption was approximately 19% lower, and the fertilizer use efficiency was higher.

Synergetic approach for energy recovery from coastal wastes based on combination of biological and thermal treatment.

Marine biomass is a promising renewable energy source, especially as this waste contains a large amount of cellulose and hemicellulose, which can contribute to convert it into energy products using anaerobic digestion (AD) and pyrolysis processes. This work was focused on a synergetic view of marine coastal waste treatment (seaweed) using two different technologies, anaerobic microbiological co-digestion, and pyrolysis. The experiments were performed with two merged technologies to assess the captured energy from the digestate in case it is contaminated.

Energetic and Economic Evaluation of Zero-Waste Fish Co-Stream Processing.

This study evaluates the possibility of recovery of high-quality valuable fish oil and proteins from fish co-streams by traditional means or a combination of several technologies. A techno-economically feasible and sustainable zero-waste process is needed for full utilisation of this co-stream's potential. This study aims to determine the energy efficiency and economic feasibility of four different zero-waste bio-refineries based on salmon filleting co-streams.