Adewoyin John A, Arimoro Francis O
Department of Animal Biology, Federal University of Technology, PMB 65, Minna, Niger State, Nigeria.
Environ Monit Assess. 2023 Jan 12;195(2):293. doi: 10.1007/s10661-022-10884-1.
Human dire need for environmental sustainability have triggered researchers to seek for organic substrates as an alternative to synthetic fertilizers in order to enhance bioremediation. Presently, nitrogen-rich organic substrate not only proffered the solution but also have proven useful in enhancing the rate of bioremediation. Animal manure is a nitrogen-rich organic substrate which has been found very effective for stimulating plant growth. Some of the animal manure used by researchers are poultry droppings, cow dung, goat manure, and pig manure. In all the papers reviewed, it was gathered that animal manure enhances bioremediation by providing nutrients favoring microbial growth and activities responsible hydrocarbon degradation. However, of the four commonly used animal manure, poultry droppings was severally reported to be a better biostimulant. Also, animal manure when sun-dried and pulverized yielded better results. It was observed that animal manure serves as substrates for earthworms which further accelerates the potential of the earthworms to remediate the soil. Also, the pollution of soil by crude oil causes a surge in its carbon content which may slow down microbial growth and activities. Thorough review of literatures, however, indicates that animal manure is capable of providing appropriate nutrient concentrations to offset such imbalance. Studies continue to lay credence to the efficacy of animal manure in enhancing microbial growth and activities responsible for the biodegradation of hydrocarbons contained in crude oil. Furthermore, the co-application of animal manure with other bioremediation strategies, such as phytoremediation and vermiremediation, should be combined for effective bioremediation of oil-contaminated environment.
人类对环境可持续性的迫切需求促使研究人员寻找有机底物作为合成肥料的替代品，以加强生物修复。目前，富含氮的有机底物不仅提供了解决方案，而且已被证明有助于提高生物修复速率。动物粪便是一种富含氮的有机底物，已发现其对促进植物生长非常有效。研究人员使用的一些动物粪便包括家禽粪便、牛粪、羊粪和猪粪。在所有 reviewed 的论文中，据了解动物粪便通过提供有利于微生物生长和负责烃类降解活动的营养物质来增强生物修复。然而，在四种常用的动物粪便中，家禽粪便多次被报道是一种更好的生物刺激剂。此外，动物粪便经过晒干和粉碎后效果更佳。据观察，动物粪便可作为蚯蚓的底物，这进一步提高了蚯蚓修复土壤的潜力。此外，原油对土壤的污染会导致其碳含量激增，这可能会减缓微生物的生长和活动频率。然而，对文献的全面 review 表明，动物粪便能够提供适当的养分浓度来抵消这种不平衡。研究继续证实动物粪便在促进微生物生长和负责原油中烃类生物降解的活动方面的功效。此外，应将动物粪便与其他生物修复策略（如植物修复和蚯蚓修复）联合应用，以有效修复受石油污染的环境。
