School of Ecology and Environment, Zhengzhou University, Zhengzhou, Henan, 450000, China.
School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.
J Environ Manage. 2022 Oct 15;320:115867. doi: 10.1016/j.jenvman.2022.115867. Epub 2022 Aug 11.
Black-odorous water, which exists widely in rural areas of China, affects the living environments of residents and causes a loss of ecosystem functions, and improper treatment may even cause secondary pollution. Moreover, the transformation relationships among the components of humus in the sediments of black-odorous water are largely unknown. Therefore, it is necessary to select appropriate methods for treating black-odorous water in rural areas and to understand the characteristics of humus in sediment during the treatment process. In this study, the use of aeration in treating black-odorous water and interstitial water in rural areas was studied and the effects of different treatment methods on the contents and spectral characteristics of humus components in sediments were explored. It was found that the quality of the treated water improved from severe black-odorous to nonblack-odorous, the colour of the sediment changed from black to greyish-brown to turquoise, and the odour changed from strong to weak. The removal rates of ammonia nitrogen, total nitrogen, total phosphorus, and chemical oxygen demand in the sediment aeration group reached more than 50% in the upper water, and more than 70% in the interstitial water. After treatment, the content of fulvic acid, the main black substance in sediment, decreased by 0.36-1.58 g/kg, and the molecular structure of the humus was simplified.
黑臭水体广泛存在于中国农村地区，影响居民的生活环境，导致生态系统功能丧失，处理不当甚至可能造成二次污染。此外，黑臭水体沉积物中腐殖质各组分之间的转化关系还很不清楚。因此，有必要选择合适的方法来处理农村地区的黑臭水，并了解处理过程中沉积物中腐殖质的特征。本研究采用曝气法处理农村黑臭水和间隙水，并探讨了不同处理方法对沉积物中腐殖质组分含量和光谱特征的影响。结果表明，处理后的水从严重黑臭变为无臭，沉积物的颜色从黑色变为灰棕色再变为绿松石色，气味从强烈变为微弱。曝气组中底水上层氨氮、总氮、总磷和化学需氧量的去除率均超过 50%，间隙水中的去除率均超过 70%。处理后，沉积物中腐殖质主要成分富里酸的含量降低了 0.36-1.58 g/kg，腐殖质的分子结构变得简单。
