Application of Microbial Technology Used in Bioremediation of Urban Polluted River: A Case Study of Chengnan River, China
Open Access
- 16 May 2018
- Vol. 10 (5), 643
- https://doi.org/10.3390/w10050643
Abstract
Contrary to the constraints in time, investment, and management of the traditional technology for waste water treatment, this paper seeks to propose a more advanced, reliable, and affordable new technology to restore urban polluted rivers to pristine quality levels. The paper also presents new ideas on the selection and use of microbial agents to improve the efficiency of pollution removal. It presents the successful implementation of microbial technology (MT) on Chengnan River, which was heavily polluted before MT implementation. Without artificial aeration, sediment dredging, or complete sewage interception, we directly sprayed a previously configured HP-RPe-3 Microbial Agent into the water body and sediment. We considered the feasibility of MT for treating polluted urban rivers from the perspective of several water quality indices evaluation methods. After the treatment, the concentration of dissolved oxygen (DO) reached 5.0 mg/L, the removal rates of ammonia nitrogen (NH3-N) and chemical oxygen demand (COD) reached 20% and 38% respectively, and the average degradation rate of total phosphorus (TP) along river was close to 15%. Also, the Nemerow Index of the river was reduced from 2.7 to 1.9. The Fuzzy Comprehensive Index shows a tendency for improvement from Inferior Grade V to a better grade (approximately Grade III). The color of the river water changed, from black or dark green, to its original color. The results indicate that the bioremediation technology of directly adding microbial agents mainly aimed for the degradation of NH3-N can preliminarily eliminate the black-odor phenomenon of urban rivers, and improve their water quality. It is expected that the MT application, and the concept of how to select the corresponding microbial agents according to main pollutants, can be widely accepted and applied to similar cases.This publication has 30 references indexed in Scilit:
- Comparative Study on Influences of Bank Slope Ecological Revetments on Water Quality Purification Pretreating Low-Polluted WatersWater, 2017
- Modelling water quality and quantity with the influence of inter-basin water diversion projects and cascade reservoirs in the Middle-lower Hanjiang RiverJournal of Hydrology, 2016
- Impacts on quality-induced water scarcity: drivers of nitrogen-related water pollution transfer under globalization from 1995 to 2009Environmental Research Letters, 2016
- A simple approach to assess water scarcity integrating water quantity and qualityEcological Indicators, 2013
- Water crisis: From conflict to cooperation—an overviewHydrological Sciences Journal, 2011
- Rural industries and water pollution in ChinaJournal of Environmental Management, 2008
- Artificial aeration to increase pollutant removal efficiency of constructed wetlands in cold climateEcological Engineering, 2006
- River pollution from non-point sources: a new simplified method of assessmentJournal of Environmental Management, 2005
- Integration of Water Quantity and Quality in Strategic River Basin PlanningJournal of Water Resources Planning and Management, 2000
- Effects of artificial aeration on the chemistry and algae of two Michigan LakesWater Resources Research, 1973