In this study, the effect of salinity on the removal of organic matter and nitrogen concentrations in bioreactor was investigated using a hybrid bench scale down-flow hanging sponge (DHS) system for 145 days of operation. The reactor had three identical sections that were filled to 30% volume with Bio-Bact to serve as attached media. The DHS reactor was fed with domestic wastewater that was mixed with increasing concentration of sodium chloride from 0.5 to 3.0% stepwise. The influent and effluent concentrations of BOD, COD, NH-N, and TN were analyzed to evaluate the performance of the DHS reactor during the operational period. Results indicate that when salinity was increased from 0.5 to 3.0%, the removal efficiency gradually decreased from 80.3% to 61.5% for COD, 76.4%-65.0% for BOD, 64.1%-48.4% for NH-N, and 50%-36% for TN. Besides, the changes in biofilm characteristics with increasing salinity were observed during the operational period. The results indicate that salinity has a significant influence on the removal of organic matters and nitrogen transformation in the biofilm of the bioreactor. Even so, the DHS reactor revealed a good potential for treating saline wastewater.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.chemosphere.2021.131101 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Aerobic-anaerobic DHS reactor for enhancing denitrification in municipal wastewater treatment.
Sci Total Environ
December 2024
Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka 940-2188, Japan; Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka 940-2188, Japan. Electronic address:
Providing anaerobic environments can enhance the denitrification capacity of wastewater treatment systems. This study developed an aerobic-anaerobic downflow hanging sponge (DHS) reactor to increase denitrification. A siphon tube was integrated with a conventional DHS to create anaerobic conditions by controlling a water column inside the reactor.
View Article and Find Full Text PDFApplication of Biofloc-Down flow hanging sponge system to remove nitrogen components in recirculating zero water exchange aquaculture system.
Bioresour Technol
December 2024
Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, 940-2188, Japan; Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, 940-2188, Japan. Electronic address:
This study presents a novel approach to sustainable aquaculture by integrating biofloc technology (BFT) with a compact down-flow hanging sponge (DHS) reactor. The integrated BFT-DHS system effectively removed nitrogen compounds while maintaining ammonia-nitrogen (NH-N) concentrations below 1 mg-N L without water exchange. Application of this system in a tank bred with juvenile Oreochromis niloticus showed a high NH-N removal rate of up to 97 % and nitrite (NO -N) concentrations were maintained at 0.
View Article and Find Full Text PDFIntegration of down-flow hanging sponge reactor to - aquaponics system.
J Environ Sci Health A Tox Hazard Subst Environ Eng
September 2024
Department of Science of Technology Innovation, Nagaoka University of Technology, Nagaoka, Japan.
Aquaponics is a promising solution for addressing food security concerns. Nonetheless, an effective water-purification system is necessary to achieve high and stable yields of fish and vegetables. This study aimed to evaluate the nitrification and oxygen transfer performance of a laboratory-scale down-flow hanging sponge (DHS) reactor with aquaponics system to treat water in an closed-aquaculture system.
View Article and Find Full Text PDFNitrification characteristics and microbial community changes during conversion of freshwater to seawater in down-flow hanging sponge reactor.
Ecotoxicol Environ Saf
September 2024
Department of Civil and Environmental Engineering, Nagaoka University of Technology, Nagaoka, Niigata, 940-2188 Japan; Department of Science and Technology Innovation, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan.
In recirculating aquaculture systems (RAS), maintaining water quality in aquaculture tanks is a paramount factor for effective fish production. A down-flow hanging sponge (DHS) reactor, a trickling filter system used for water treatment of RAS that employs sponges to retain biomass, has high nitrification activity. However, nitrification in seawater RAS requires a long start-up time owing to the high salinity stress.
View Article and Find Full Text PDFremoval in down-flow hanging sponge reactors: insights from laboratory reactor studies.
J Environ Sci Health A Tox Hazard Subst Environ Eng
August 2024
Regional Environment Conservation Division, National Institute for Environmental Studies, Tsukuba, Japan.
Down-flow hanging sponge (DHS) reactors, employed in domestic wastewater treatment, have demonstrated efficacy in eliminating and other potentially pathogenic bacteria. The aim of this study was to elucidate the mechanism of removal of by employing a cube-shaped polyurethane sponge carrier within a compact hanging reactor. An removal experiment was conducted on this prepared sponge.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!