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The effects of electric field assisted composting on ammonia and nitrous oxide emissions varied with different electrolytes. | LitMetric
Enhancing electron transfer through directly elevating electric potential has been verified to reduce gaseous emissions from composting. Reducing electric resistance of composting biomass might be a choice to further strengthening electron transfer. Here, the effects of chemical electrolytes addition on gaseous Nitrogen emission in electric field assistant composting were investigated. Results suggest that adding acidic electrolyte (ferric chloride) significantly reduced ammonia (NH) emission by 72.1% but increased nitrous oxide (NO) emission (by 24-fold) (P < 0.05), because of a dual effect on nitrifier activity: i) an elevated abundance and proportion of ammonia oxidizing bacteria Nitrosomonadaceae, and ii) delayed growth of nitrite oxidizing bacteria. Neutral and alkaline electrolytes had no negative or positive effect on NO or NH emission. Hence, there is a potential trade-off between NH and NO mitigation if using ferric chloride as acidic electrolyte, and electrolyte addition should aim to enhance electron production promote NO mitigation.
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