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Water 2018, 10(5), 643; https://doi.org/10.3390/w10050643

Application of Microbial Technology Used in Bioremediation of Urban Polluted River: A Case Study of Chengnan River, China

1
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
2
National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, Nanjing 210098, China
3
Department of Agricultural Engineering, Muhammad Nawaz Shareeef University of Agriculture, Multan 6000, Pakistan
4
School of Water Conservancy and Electric Power, Hebei University of Engineering, Handan 056038, China
*
Author to whom correspondence should be addressed.
Received: 13 April 2018 / Revised: 10 May 2018 / Accepted: 13 May 2018 / Published: 16 May 2018
(This article belongs to the Section Water Quality and Ecosystems)
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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. View Full-Text
Keywords: microbial technology; urban polluted river; bioremediation; water quality index; HP-RPe-3 Microbial Agent; Nemerow Index; fuzzy comprehensive evaluation index microbial technology; urban polluted river; bioremediation; water quality index; HP-RPe-3 Microbial Agent; Nemerow Index; fuzzy comprehensive evaluation index
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gao, H.; Xie, Y.; Hashim, S.; Akhtar Khan, A.; Wang, X.; Xu, H. Application of Microbial Technology Used in Bioremediation of Urban Polluted River: A Case Study of Chengnan River, China. Water 2018, 10, 643.

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