Effect of Bentonite and β-Cyclodextrin Addition on H2S and NH3 Emissions during Kitchen Waste Composting

In order to reduce odor emissions such as NH3 and H2S, this study designed experiments to investigate the effects of bentonite and β-cyclodextrin on producing and releasing H2S and NH3 during kitchen waste composting. All experiments were performed in simulated composting device. The results showed that the productions of H2S were reduced by 16.4% and 13.7% for the treatments of 2% and 3% that compared to addition 1% bentonite, the productions of NH3 were reduced by 0.1% and 54.8% for the treatments of 1% and 3% that compared to 2% bentonite addition. For the treatments of β-cyclodextrin addition, the productions of H2S were reduced by 33.9% and 31.0% for the treatments of 1% and 2% that compared to addition 3% β-cyclodextrin, the productions of NH3 were reduced by 30.8% and 23.5% for the treatments of 1% and 3% that compared to 2% β-cyclodextrin addition. After integrating the reduction of NH3 and H2S emission, 3% bentonite and 1% β-cyclodextrin addition are the preferred during kitchen waste composting. Compared with bentonite and β-cyclodextrin, β-cyclodextrin is the better additive for the odor control during kitchen waste composting.