METHOD FOR PROCESSING A LIQUID NITROGEN RICH ORGANIC WASTE PRODUCT, THEREBY OBTAINED FERTILIZER SOLUTION AND USE THEREOF

摘要

The invention relates to a method for processing a liquid nitrogen rich organic waste product, in particular a manure product, to an aqueous fertilizer solution. The method comprises a biological conversion process so as to obtain a biologically stable fertilizer solution. This conversion process includes at least a nitrification step wherein nitrifiable ammonium nitrogen is converted in nitrate nitrogen and, only if the fraction to be nitrified has a too high content of nitrifiable nitrogen, a denitrification step. The fertilizer solution is separated off after the nitrification step so that it contains nitrate and only up to 150 mg NH4<+>-N/l at the most. The fertilizer solution can be used as leaf nutrition or in a hydroponic system.