Implementation of a constructed wetland for the sustainable treatment of inland shrimp farming water

Pham, Thi Thu Hang; Cochevelou, Vincent; Dinh, Hoang Dang Khoa; Breider, Florian; Rossi, Pierre

doi:10.1016/j.jenvman.2020.111782

Cited by 14 publications

(12 citation statements)

References 27 publications

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“…The CW system was also reported to be effective in the removal of TP (42%) in contaminated runoff/storm water from urban area [27]. In aquaculture effluent treatment, a study under laboratory-based CW showed an average of 31% in TP reduction [16]. In line with the previous study, our results showed that the CW system was able to effectively remove TP (39.74%) during 2013-2018.…”

Section: Discussionsupporting

confidence: 89%

“…High levels of NH 3 and NO 2 − -N-inhibit growth performance, induce physiological dysfunction and can even cause death in fish [37]. Hang pham et al reported that horizontal subsurface flow CW had a clear impact on the removal of NO 3 − -N and NO 2 − -N, and allowed these parameters to maintain at a low level in CW-connected shrimp tanks [16]. Lin et al [38] found an extremely high removal rate of CW on NH 4 + -N (>86%), NO 3 − -N (>82%) and NO 2 − -N (>99%), and they speculated that this might be related to low N concentrations in aquaculture wastewater.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, DO content is considered to be a limiting factor for COD removal, and insufficient DO affects the activity of microorganisms, which limits COD degradation in CW [47]. Nevertheless, it has been suggested that sedimentation and filtration are also important mechanisms of COD removal because they can remove most of the suspended solids [16]. Numerous studies have confirmed that VSF CW exhibits a good efficiency in COD removal, achieving a removal rate of more than 60% [48,49].…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, the DO values were significantly higher in CW inlet than that in CW outlet, indicative of oxygen depletion in the CW. The phenomenon may be caused by the aerobic respiration of heterotrophic microorganisms in CW, which can effectively degrade the pollutants in aquaculture wastewater [16].…”

Section: Monitoring Running Parametersmentioning

confidence: 99%

“…Omotade et al [15] suggested that CWs (0.97 m 2 ) have a great potential for the treatment of aquaculture wastewater, which contributed to the recycling of the wastewater. A study in a laboratory-based horizontal subsurface flow CW (125 cm × 20 cm × 50 cm) showed that the nitrate, chemical oxygen demand (COD) and total aerobic bacteria were reduced substantially over 50 days and improved the water quality of the shrimp culture [16]. Meanwhile, CW microcosms (40 cm × 30 cm × 30 cm) with vertical subsurface flow can effectively remove the organic micropollutants in freshwater aquaculture effluents over 4 weeks [17].…”

Section: Introductionmentioning

confidence: 99%

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The Sustainable Treatment Effect of Constructed Wetland for the Aquaculture Effluents from Blunt Snout Bream (Megalobrama amblycephala) Farm

Jia

Hou

et al. 2021

Water

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In aquaculture, constructed wetland (CW) has recently attracted attention for use in effluent purification due to its low running costs, high efficiency and convenient operation,. However, less data are available regarding the long-term efficiency of farm-scale CW for cleaning effluents from inland freshwater fish farms. This study investigated the effectiveness of CW for the removal of nutrients, organic matter, phytoplankton, heavy metals and microbial contaminants in effluents from a blunt snout bream (Megalobrama amblycephala) farm during 2013–2018. In the study, we built a farm-scale vertical subsurface flow CW which connected with a fish pond, and its performance was evaluated during the later stage of fish farming. The results show that CW improved the water quality of the fish culture substantially. This system was effective in the removal of nutrients, with a removal rate of 21.43–47.19% for total phosphorus (TP), 17.66–53.54% for total nitrogen (TN), 32.85–53.36% for NH4+-N, 33.01–53.28% NH3-N, 30.32–56.01% for NO3−-N and 42.75–63.85% for NO2−-N. Meanwhile, the chlorophyll a (Chla) concentration was significantly reduced when the farming water flowed through the CW, with a 49.69–62.01% reduction during 2013–2018. However, the CW system only had a modest effect on the chemical oxygen demand (COD) in the aquaculture effluents. Furthermore, concentrations of copper (Cu) and lead (Pb) were reduced by 39.85% and 55.91%, respectively. A microbial contaminants test showed that the counts of total coliform (TC) and fecal coliform (FC) were reduced by 55.93% and 48.35%, respectively. In addition, the fish in the CW-connected pond showed better growth performance than those in the control pond. These results indicate that CW can effectively reduce the loads of nutrients, phytoplankton, metals, and microbial contaminants in effluents, and improve the water quality of fish ponds. Therefore, the application of CW in intensive fish culture systems may provide an advantageous alternative for achieving environmental sustainability.

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Section: Discussionsupporting

confidence: 89%