当前位置: X-MOL 学术J. Environ. Qual. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The microbiology of rebuilding soils with water treatment residual co-amendments: Risks and benefits
Journal of Environmental Quality ( IF 2.4 ) Pub Date : 2021-08-31 , DOI: 10.1002/jeq2.20286
Wendy Stone 1 , Noxolo S Lukashe 2 , Lynsay I Blake 3 , Tariro Gwandu 4, 5 , Ailsa G Hardie 2 , John Quinton 6 , Karen Johnson 4 , Catherine Elaine Clarke 2
Affiliation  

Water treatment residual (WTR) is composed of sludges from the potable water treatment process, currently largely destined for landfill. This waste can be diverted to rebuild degraded soils, aligning with the UN's Sustainable Development Goals 12 (Consumption and Production) and 15 (Terrestrial Ecosystems). Biosolids are tested against stringent pathogen guidelines, yet few studies have explored the microbial risk of WTR land application, despite anthropogenic impacts on water treatment. We explored the microbial risks and benefits of amending nutrient-poor sandy soil with WTRs. Our results showed that the culturable pathogen load of wet and dry WTRs did not warrant pre-processing before land application, according to South African national quality guidelines, with fecal coliforms not exceeding 104 colony forming units per gram dry weight in wet sludges sampled from four South African and Zimbabwean water treatment plants and decreasing upon drying and processing. There was no culturable pathogenic (fecal coliforms, enterococci, Salmonella, and Shigella) regrowth in soil incubations amended with dry WTR. However, the competition (microbial load and diversity) introduced by a WTR co-amendment did not limit pathogen survival in soils amended with biosolids. Application of WTR to nutrient-poor sandy soils for wheat (Triticum aestivum L.) growth improved the prokaryotic and eukaryotic culturable cell concentrations, similar to compost. However, the compost microbiome more significantly affected the bacterial beta diversity of the receiving soil than WTR when analyzed with automated ribosomal intergenic spacer analysis. Thus, although there was a low pathogen risk for WTR amendment in receiving soils and total soil microbial loads were increased, microbial diversity was more significantly enhanced by compost than WTR.

中文翻译:

使用水处理残留共同修正物重建土壤的微生物学:风险和收益

水处理残留物 (WTR) 由来自饮用水处理过程的污泥组成,目前主要用于垃圾填埋。根据联合国可持续发展目标 12(消费和生产)和 15(陆地生态系统),这些废物可以转用于重建退化的土壤。生物固体根据严格的病原体指南进行了测试,尽管人为影响水处理,但很少有研究探讨 WTR 土地应用的微生物风险。我们探讨了用 WTR 改良营养贫乏的沙质土壤的微生物风险和益处。我们的结果表明,根据南非国家质量指南,湿和干 WTR 的可培养病原体载量不需要在土地应用前进行预处理,粪便大肠菌群不超过 10 4从四个南非和津巴布韦水处理厂取样的湿污泥中每克干重的菌落形成单位,并在干燥和加工时减少。在用干燥 WTR 修正的土壤培养物中没有可培养的病原体(粪便大肠菌群、肠球菌、沙门氏菌志贺氏菌)再生长。然而,WTR 共同修正案引入的竞争(微生物负荷和多样性)并没有限制病原体在用生物固体改良的土壤中的存活。WTR在小麦( Triticum aestivum)贫营养沙质土壤中的应用L.) 生长提高了原核和真核可培养细胞的浓度,类似于堆肥。然而,当使用自动核糖体基因间间隔分析进行分析时,堆肥微生物组对接收土壤的细菌β多样性的影响比 WTR 更显着。因此,尽管在接收土壤中 WTR 修正的病原体风险较低并且土壤微生物总量增加,但堆肥比 WTR 更显着地增强了微生物多样性。
更新日期:2021-08-31
down
wechat
bug