Acidophilic nitrification of biogas digestates accelerates sustainable hydroponics by enhancing phosphorus dissolution

Influence upon Biogas Production of the C/N Ratio and the Heavy Metal Incidence in the Manure Composition

“…It is to be noted that the amount and number of heavy metals found in organic matter should not be ignored during the anaerobic digestion process either. The uncontrolled use of animal manure with a high content of heavy metals as raw material in the production of biogas can lead to the inhibition of the anaerobic digestion process [59] (p. [1][2][3][4][5][6][7][8][9][10][11][12][13][14], affecting the production of biogas and methane [60] (p. 266-272). While a high concentration of heavy metals inhibits the process of anaerobic digestion, a lower concentration can generate the growth of microorganisms [61] (p. 100099).…”

“…Biogas is considered a feasible solution in the context of the energy crisis [5,6] (p. 115870, p. [41][42][43][44] and also a solution to reduce the pollution generated by agricultural waste [7] (p. 103577). It is worth noting that all agro-zoo-technical waste subjected to the anaerobic digestion process can become an important source of nutrients and methane production [8,9] (p. 101391, p. 161656).…”

“…2 Another advantage of using the waste lies in the fact that it is widely distributed and ensures a low purchase price [10] (p. [1][2][3][4][5][6][7][8][9][10]. Following some studies, it was concluded that reactors fueled with pig manure can generate up to 6.597.520 MWh/year [11] (p. 4933).…”