The effect of anaerobic thermophilic fermentation of organic waste on changes in the content of biogenic elements

Zulfiya Bayazitova

2023

Full text Open access: Gold Metadata (CSL-JSON)
DOI 10.26577/eje.2023.v75.i2.01
Data confidence 70 medium
How this score is calculated

It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.

Abstract

The influence of anaerobic thermophilic fermentation of raw materials of plant and animal origin on the change in the content of biogenic elements in the liquid and solid effluent fractions after a biogas plant (BSU) has been established. The transformation of organic compounds in the process of anaerobic digestion causes an alkaline reaction of the biogas effluent. Comparing samples of liquid fraction (fugate) and solid fraction (digestate) of waste from various raw materials (food plant waste with cattle manure and the addition of the biopreparation "Agrarka", pig manure and litter manure of cattle), it was found that the nitrogen and potassium content in the samples of the fugate exceeds the corresponding digestate values, but the phosphorus content is higher in the digestate (almost three times). According to the content of biogenic effluent elements after anaerobic thermophilic fermentation, waste after processing of food plant waste with cattle manure and the addition of the biological preparation "Agrarka" prevails. Liquid and solid fractions of biogas plant waste are enriched with ammonium nitrogen by more than 40-60% compared to the raw material, depending on the type of raw material. The fugate contains less than 4 to 10% dry matter and the main amount of potassium. Up to 80% of the mass fraction of nitrogen in the fugate is its ammonium form. Against the background of low ash content of digestate, the total carbon content is high (more than 30%). Keywords: effluent, fertilizer, feedstock, total carbon, humus formation, digestate, fugate.