Abstract
A significant expansion of anaerobic digestion (AD) processes would certainly result in a reduction in the current dependence on fossil fuels. The operational costs, the large amounts of digestate generated and the expenses of dealing with it and the volatility of the fuel indexes represent major environmental and economical challenges to the diffusion of AD. Increasing the bio-products of AD could possibly help in increasing its profitability and limit these challenges. This study investigates the influence of mango starch and seed coats on the biogas produced from mango waste. To overcome the environmental challenges, the digestate was tested and its bio-fertiliser potential proven. The study reached the conclusion that the effect of the starch on the AD biogas of mango waste is low while the effect of the seed coats is quite high. This finding supports further investigations to evaluate the effect of the production of mango starch and seed coat-based products on the profitability of AD. The highest energy balance achieved was 65% at 32 °C, 3.93 g-VS organic concentration and 37% sludge concentration, which yielded a maximum CH4 yield of 62.5%. This finding encourages the application of gate fees for accepting bio-waste, which may help in overcoming its economic challenges.
Highlights
Fossil fuels and their derivatives have adverse impacts on humans, animals and the environment.The huge amounts of the waste generated every day represent a major threat and can cause major negative environmental consequences
The research carried out in the present study to investigate the impact of them on the biogas, is in order to investigate later the impact of the production of bioproducts along with the biogas and bioslurry and to compare these to the environmental and economical challenges associated with Anaerobic digestion (AD)
The increase of AD profitability through increasing the bioproducts and the application of gate fees for accepting waste, could greatly help in overcoming the environmental and economical challenges associated with AD
Summary
The huge amounts of the waste generated every day represent a major threat and can cause major negative environmental consequences. Anaerobic digestion (AD) has proven its potential in converting many types of biomass into value-added products, currently investment in AD is not very attractive due to some operational issues, the volatility of the fuel indexes and the large amounts of waste generated when it is applied at large scale [2,3,4], whereby the large amounts of digestate generated post-AD can pose a major environmental threat if are not properly handled [5]. N, P and K in varied concentrations It contains low amounts of other nutrients and trace elements which can help in maintaining soil fertility. AD digestate has broadly confirmed its potential in agriculture applications as a bio-fertiliser, soil amendment, etc. If the whole digestate must be separated into liquid and solid, an additional cost would
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