Gasification filter cake reduces the emissions of ammonia and enriches the concentration of phosphorous in Caragana microphylla residue compost

Bioresource Technology
Xingyi WangJianshe Li

Abstract

Nutrient loss is a major problem during agricultural waste composting. This study investigated the impact of gasification filter cake (GFC) addition on gaseous emissions and nutrient loss during composting of chicken manure mixed with Caraganna microphylla straw. The GFC was added to the composting mix at dry weight rates of 0% (GFC0), 6.25% (GFC6.25), 12.5% (GFC12.5), 25% (GFC25) and 50% (GFC50). Overall, GFC12.5 and GFC25 efficiently enhanced organic matter decomposition, reduced N loss and enriched P and K concentrations during composting, as compared to GFC0. However, GFC6.25 did not show a significant effect on organic matter decomposition, while GFC50 had no effect on N loss. As a result, an overall enhancement of nutrient contents was observed in the final composts of GFC12.5 and GFC25. These results suggest that the addition of GFC at moderate-rates (i.e. 12.5% and 25%) can enhance nutrient retention and thereby result in a nutrient-rich compost.

References

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