Journal of East China Normal University(Natural Sc ›› 2018, Vol. 2018 ›› Issue (6): 12-21.doi: 10.3969/j.issn.1000-5641.2018.06.002

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Experimental study on a new enhanced in-situ denitrification device for upgrading domestic wastewater treatment plants

CUI He1,2, YANG Yin-chuan1,2, HUANG Min-sheng1,2, YANG Le1,2, YIN Chao1,2, HE Yan1,2, CAO Cheng-jin1,2   

  1. 1. School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China;
    2. Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, East China Normal University, Shanghai 200241, China
  • Received:2018-07-16 Online:2018-11-25 Published:2018-12-01

Abstract: To effectively strengthen the nitrogen removal efficiency of wastewater treatment plants (WWTPs), a novel deep denitrification device (Tubular bio-reactor device, TBD) was developed. Four kinds of solid materials (loofah, palm fiber, bagasse, and fibrous fillers) were used as fillers for the TBD. The best filler type was determined by comparing the denitrification performance of TBDs with different fillers. Then, high-throughput sequencing results of the matrix biofilm were used to analyze the denitrification mechanism. The results showed that the best removal rate of nitrogen from water was achieved with the TBD filled with bagasse. For this TBD, the removal rates of NH4+-N, NO3--N, NO2--N and TN were 72%, 64%, 97%, and 82%, respectively, and NH4+-N and TN concentrations both attained Grade 1-A of the Chinese-National discharge standard for WWTPs (GB 18918-2002). TBD filled with bagasse had a high abundance and diversity of microbial species with a Chao1 index of 9 743.55 and a Shannon index of 6.37, and the denitrification-related genus in the microbial community structure was dominant (23.75%). In addition, nitrification (7.73%) and anaerobic ammonium oxidation (2.0%) related genera were detected in the biofilm sample. The results suggest that the internal environment of TBD filled with "bagasse" was good for the enrichment and growth of denitrifying-related bacteria. This study was aimed at providing a scientific basis and parameters for TBDs used in engineering applications.

Key words: domestic wastewater treatment plants, upgrading and reconstruction, enhanced nitrogen removal, in-situ purification, tubular bio-purification devices

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