University of Cordoba (Spain), Department of Inorganic Chemistry and Chemical Engineering, Campus Universitario de Rabanales, Carretera N-IV, Km 396, Edificio Marie Curie, 14071, Córdoba, Spain.
University of Cordoba (Spain), Department of Inorganic Chemistry and Chemical Engineering, Campus Universitario de Rabanales, Carretera N-IV, Km 396, Edificio Marie Curie, 14071, Córdoba, Spain.
J Environ Manage. 2019 Oct 1;247:205-213. doi: 10.1016/j.jenvman.2019.06.076. Epub 2019 Jun 24.
Sewage sludge and bulking agent with small proportions of eggplant waste (EP) (4.7 and 8.6%) were co-composted at full scale to evaluate the feasibility of their joint valorization and to reduce the odorous impact during composting. In this sense, physico-chemical, respirometric and olfactometric variables were monitored throughout the co-composting process. The physico-chemical variables studied were related to each other to evaluate their effect on the quality of the final product and the odoriferous impact. It was observed that the reduction in nitrogen concentration was not parallel to the removal of organic matter, which influenced the odor concentration emitted. Furthermore, during the hydrolytic stage of the co-composting process, the odor concentration was lower when the agricultural waste content was highest (8.6% EP: 6317 and 8192 ou/m) in comparison with the lowest concentration of EP (4.7% EP: 9214 and 14720 ou/m) or without the addition of EP (reference composting pile: 10200 and 22500 ou/m). Although sewage sludge is more biodegradable than eggplant waste, the co-composting process was carried out under suitable conditions. Approximately 90 days were required to obtain a stabilized compost. Consequently, co-composting might be a suitable alternative to valorize EP and reduce the odoriferous impact of sewage sludge, with the consequent economic, social and environmental benefits.
将少量茄子废弃物（EP）（4.7%和 8.6%）与污水污泥一起进行规模化共堆肥，以评估它们联合增值的可行性，并减少堆肥过程中的恶臭影响。在这方面，监测了共堆肥过程中的物理化学、呼吸计和嗅探变量。研究的物理化学变量相互关联，以评估它们对最终产品质量和恶臭影响的影响。观察到氮浓度的降低与有机物的去除不成正比，这影响了散发的气味浓度。此外，在共堆肥过程的水解阶段，当农业废物含量最高（8.6%EP：6317 和 8192 ou/m）时，气味浓度低于 EP 浓度最低时（4.7%EP：9214 和 14720 ou/m）或不添加 EP 时（参考堆肥堆：10200 和 22500 ou/m）。尽管污水污泥比茄子废弃物更具生物降解性，但共堆肥过程是在适宜的条件下进行的。大约需要 90 天才能获得稳定的堆肥。因此，共堆肥可能是一种有价值的茄子废弃物利用和减少污水污泥恶臭影响的替代方法，从而带来经济、社会和环境效益。
