Abstract
AbstractThis study aimed to investigate the behavioral shifts of constructed wetland (CW) when the treated water was changed from domestic wastewater to mariculture wastewater. The results showed that the average removal efficiencies of ammonium nitrogen (), total nitrogen and chemical oxygen demand (COD) were 29.54, 46.07 and 57.15% in mariculture wastewater, respectively, which were significantly lower than those in domestic wastewater (71.35, 66.34 and 74.98%, respectively). While there was no significant difference in the removal efficiency of nitrate and phosphate (P > 0.05) between the two systems. Based on the analysis of bacterial community and adsorption properties, the results further indicated that the removal mechanism of between both systems was mainly due to substrate adsorption: the maximum adsorption capacity of on the substrate in mariculture wastewater was 5,432 mg kg−1, whereas that in domestic wastewater was 18,033 mg kg−1. In terms of bacterial communities, the dominant bacteria at the family level were Victivallaceae (18.63%) in domestic wastewater and Porphyromonadaceae (18.37%) in mariculture wastewater, which showed the significant alteration to the bacterial community. In conclusion, this study showed that conventional CW could be used for treating wastewater from land-based marine aquaculture, while the operating conditions needed to be optimized in the process of application.
Highlights
Many technologies have been widely employed for purification of mariculture wastewater including biological technologies and physicochemical equipment (Munavalli & Pise ; Zhao et al ; Cao et al ), while these approaches lead to some problems such as capital investment, energy consumption, maintenance requirements, secondary pollution and low removal efficiency (He et al )
Microbes play a key role in the nitrification and denitrification processes, which are widely considered as the major N removal mechanism in constructed wetland (CW) (Vymazal )
Conventional CW can be applied in mariculture wastewater treatment, while the process was affected by wastewater characteristic, and it had negative effects on NHþ4 -N, total nitrogen and chemical oxygen demand (COD) removal efficiency
Summary
Many technologies have been widely employed for purification of mariculture wastewater including biological technologies and physicochemical equipment (Munavalli & Pise ; Zhao et al ; Cao et al ), while these approaches lead to some problems such as capital investment, energy consumption, maintenance requirements, secondary pollution and low removal efficiency (He et al ) Apart from these methods, constructed wetland (CW) as a lower cost, environment friendly, work efficient and energy-saving technology with no production of secondary pollutants, have shown potential for the mariculture wastewater treatment (Teresa ; Wang et al a). With the development of the urban ecological civilization construction and the progress of rural domestic wastewater interception, many CWs that were originally used for domestic wastewater treatment in rural areas are idled These CWs had the feasibility of being reused to treat mariculture wastewater. During the transformation of the wastewater, understanding of the key purification mechanisms of CWs for specific contaminants in mariculture wastewater remains unclear
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