Enhanced nitrification in integrated floating fixed-film activated sludge (IFFAS) system using novel clinoptilolite composite carrier

doi:10.1007/s11783-019-1153-0

Front. Environ. Sci. Eng.

2019, Vol. 13

Issue (5) : 69 https://doi.org/10.1007/s11783-019-1153-0

RESEARCH ARTICLE

Enhanced nitrification in integrated floating fixed-film activated sludge (IFFAS) system using novel clinoptilolite composite carrier

Aoshuang Jing, Tao Liu, Xie Quan(

), Shuo Chen, Yaobin Zhang

Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China

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Abstract

Novel carriers with favorable electrophilicity and hydrophilicity were prepared.

Novel carriers had the capability of nitrification-enhancing.

NH₄⁺-N removal efficiency of IFFAS process rose up to 20% with novel carriers.

Nitrosomonadales and Nitrospirales were identified as the functional nitrifiers.

The population of Nitrospirales increased by 4.51%.

The integrated floating fixed-film activated sludge (IFFAS) process is an ideal preference for nitrification attributing to the longer sludge age for nitrifiers. However, as the core of this process, conventional carriers made of polymer materials usually exhibit negative charge and hydrophobicity on the surface, which is unbeneficial to nitrifying biofilm formation. In this study, novel clinoptilolite composite carriers with favorable hydrophilicity, positive charge and nitrification-enhancing capability were made and implemented in IFFAS system. In comparison with conventional carriers, the novel clinoptilolite composite carriers displayed positive charges on the surface (11.7±1.1 mV, pH 7.0) with increased hydrophilicity (surface contact angle dropped to 76.7°). The novel-carriers-based reactors achieved significantly better NH₄⁺-N removal efficiency at different influent concentrations, dissolved oxygen (DO) levels and shock loads (NH₄⁺-N removal efficiency rose up to 20% comparing with the control reactors filled with polyethylene (PE) carriers or activated sludge). High-throughput sequencing (HTS) results indicated the novel clinoptilolite composite carriers provided favorable niche for more types of bacteria, especially for Nitrosomonadales and Nitrospirales (the functional nitrifiers in the system). The population of Nitrospirales increased by 4.51% by using novel clinoptilolite composite carriers comparing with using PE carriers, which ensured enhanced nitrification process. This study was expected to provide a practical option for enhancing wastewater nitrification performance with the novel clinoptilolite composite carrier.

Keywords Biofilm carrier Clinoptilolite Integrated floating fixed-film activated sludge (IFFAS) Microbial community Nitrification Wastewater

Corresponding Author(s): Xie Quan

Issue Date: 30 July 2019

Cite this article:

Aoshuang Jing,Tao Liu,Xie Quan, et al. Enhanced nitrification in integrated floating fixed-film activated sludge (IFFAS) system using novel clinoptilolite composite carrier[J]. Front. Environ. Sci. Eng., 2019, 13(5): 69.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-019-1153-0
https://academic.hep.com.cn/fese/EN/Y2019/V13/I5/69

Fig.1 Photographs of conventional carriers (a) and novel composite carriers with 1 wt%, 2 wt% and 3 wt% clinoptilolite (b, c and d).

Fig.2 Schematic diagram of reactor used in the experiment.

Tab.1 Carrier surface properties

Fig.3 Variations of NH₄⁺-N concentrations (a) and COD concentrations (b) at different influent concentrations.

Fig.4 Variations of NH₄⁺-N concentrations (a) and COD concentrations (b) at different DO levels (Run 1: 3.0±0.5 mg/L; Run 2: 2.5±0.5 mg/L; Run 3: 1.5±0.5 mg/L).

Fig.5 Variations of NH₄⁺-N concentrations (a) and COD concentrations (b) at different HRTs.

Fig.6 The proportion of N-compounds in effluent and nitrogen loss of each reactor.

Tab.2 Richness and ɑ-diversity of suspended sludge and biofilm samples in reactors

Fig.7 Taxonomic classification of the bacterial communities at phylum level.

Fig.8 Taxonomic classification of the bacterial communities at order level.

Tab.3 Functional microorganisms and proportions (%) of the major orders in each sample

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