First of all, you have to specify what kind of biogas slurry you are talking about. The quality of the biogas slurry depends on many factors, but the most important is the type of raw material you use for biogas production. Biogas slurries made from sewage sludge are of a completely different quality than, for example, biogas slurries made from corn silage.

You cannot produce organic fertiliser without enriching the biogas slurry with artificial nitrogen, phosphorus or potassium. The concentrations of nitrogen, phosphorus or potassium in biogas slurry are so low that biogas slurry cannot be considered fertilizer according to the definition of fertilizer.

Even the preparation of a biopesticide from biogas slurry is an unrealistic idea. What pesticides are found in biogas slurry? I have never heard or seen information that biogas slurry has pesticidal effects. It might be possible to consider using biogas slurry to cultivate e.g. bacteria producing a biopesticide, but the concentrations of usable substrates in biogas slurry are very low to make cultivation economically viable. Further research would be needed.

Bets regards

Vit

Vit Mateju I totally agree and The quality and potential applications of biogas slurry vary significantly based on the source of the organic matter used in anaerobic digestion.

Biogas slurries derived from sewage sludge often contain higher concentrations of nutrients (nitrogen, phosphorus, and potassium) due to the presence of human waste. These slurries can potentially be used as a soil amendment or organic fertilizer, but careful analysis and enrichment may be necessary to meet specific nutrient requirements.

However, biogas slurries produced from agricultural or industrial waste may have lower nutrient content and may require additional fertilization to be used as a soil amendment.

Regarding biopesticide production, while biogas slurries may contain beneficial microorganisms, their concentrations and specific pesticidal properties would need to be thoroughly investigated. It's possible that certain biogas slurries could be used as a substrate for cultivating biopesticide-producing bacteria, but further research is needed to determine the economic feasibility and effectiveness.

As always it's garbage in garbage out such as sewage sludge.

That's why we convert clean organic wastewaters and waste from agri, food and beverage industries to high quality biofertilizer containing organic carbon, NPK and micro-nutrients along with active micro-organisms compatible to those in fertile soils. As proven in field trials our biofertilizers result in superior crop quality and yield as compared to chemical fertilizers.