Turnover and loss of nitrogenous compounds during composting of food wastes

Abstract

Few people have so far explored into the research of the dynamics of various nitrogenous compounds (including water-soluble nitrogen) in composting of food wastes. This study aimed to investigate the solid-phase nitrogen, water-soluble nitrogen, nitrogen loss together with ammonia volatilization in the process of food wastes composting. A laboratory scale static aerobic reactor in the experiment was employed in the composting process of a synthetic food waste, in which sawdust was used as the litter amendment. In the experiment, oxygen was supplied by continuous forced ventilation for 15 days. The results have shown that the concentrations of total nitrogen and organic nitrogen decrease significantly in the composting process, whereas NH₄⁺-N concentration increases together with little fluctuation in NO₃^--N. After composting, the total content of the water-soluble nitrogen compounds in the compost greatly increased, the total nitrogen loss amounted to 50% of the initial nitrogen, mainly attributed to ammonia volatilization. 56.7% of the total ammonia volatilization occurred in the middle and late composting of the thermophilic stage. This suggested that the control at the middle and late composting of thermophilic stage is the key to nitrogen loss in the food waste compost.

References

1. Wang Q H Ma H Z Wang X M et al.Resource recycling technology of food wastesModern Chemical Industry 2004 24(7)5659 (in Chinese)
2. Fukumoto Y Osada T Hanajima D et al.Patterns and quantities of NH₃, N₂O and CH₄ emissionsduring swine manure composting without forced aeration-effect of compostpile scaleBioresource Technology 2003 89109114. doi:10.1016/S0960‐8524(03)00060‐9
3. Yang Y M Liu H L Yang Z F et al.Methods and techniques in the control of nitrogenloss during the composting-A reviewJournalof Beijing Normal University (Natural Science) 2005 (41)213216 (in Chinese)
4. Bishop P L Godifrey C Nitrogen transformations duringsludge compostingBioCycle 1983 24(4)3439
5. Martins O Lessof nitrogenous compounds during composting of animal wastesBioresource Technology 1992 42103111. doi:10.1016/0960‐8524(92)90068‐9
6. Tiquia S M Tam N F Y Fate of nitrogen during compostingof chicken litterEnvironmental Pollution 2000 110(3)535541. doi:10.1016/S0269‐7491(99)00319‐X
7. Barrington S Choiniàre D Trigui M et al.Effect of carbon source on compost nitrogen andcarbon lossesBioresource Technology 2002 83(3)189194. doi:10.1016/S0960‐8524(01)00229‐2
8. Eklind Y Kirchmann H Composting and storage of organichousehold waste with different litter amendments. II: Nitrogen turnoverand lossesBioresource Technology 2000 74(2)125133. doi:10.1016/S0960‐8524(00)00005‐5
9. Zhang X F Wang H T Zhou H Y et al.Nitrogen transformation during co-composting offlower wastes and cattle manureEnvironmentalScience 2003 24(3)126131 (in Chinese)
10. Bao S D AgriculturalChemical Assay of Soil. 3rd edBeijing,ChinaAgricultural Press 2000 4256 (in Chinese)
11. State EnvironmentalProtection Administration of China. Monitoring and Analyzing Methodof Water and Waste Waster. 4th edBeijing,ChinaChina Environmental SciencePress 2002 (in Chinese)
12. Huang G F Zhang L J Zhang Z T et al.On nitrogen transformations and maturity duringcomposting of pig manureChinese Journalof Applied Ecology 2002 13(11)14591462 (in Chinese)
13. Insam H Riddech N Klammer S Microbiology of CompostingNew York, USASpringer 2002
14. Chen S H Zhang S M Theory and Technology of MunicipalSolid WastesShanghai, ChinaFudan University Press 1990 362223 (in Chinese)
15. United States Environmentalprotection Agency (USEPA). Composting: Yard Trimmingsand Municipal Solid Waste. United States Environmental protectionAgency. USEPA Report 530-R-94-003 1993