Function of aquatic plants on nitrogen removal and greenhouse gas emission in enhanced denitrification constructed wetlands: Iris pseudacorus for example

Gu, Xushun; Chen, Danyue; Wu, Fei; Tang, Li; He, Shengbing; Zhou, Weili

doi:10.1016/j.jclepro.2021.129842

Cited by 46 publications

(5 citation statements)

References 43 publications

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“…The main sources of nitrogen for aquatic plants are dissolved organic and inorganic nitrogen, and absorbed ammonium nitrogen is used directly for amino acid synthesis. Absorbed nitrate nitrogen can only be utilized after metabolic reduction [22]. In this research, from the 2nd to the 7th week, the TN of the AM system was significantly higher than that of the AP system.…”

Section: Discussionmentioning

confidence: 52%

Effect of an Ipomoea aquatica Floating Raft on the Water Quality, Antioxidant System, Non-Specific Immune Responses, and Microbial Diversity of Penaeus vannamei in an Aquaculture System

Ruan,

Xie,

et al. 2024

Fishes

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Pacific white shrimp (Penaeus vannamei) is one of the main shrimp species cultivated around the world. Despite its high yields and easy handling, water pollution from intensive shrimp cultivation remains a serious problem in China. In this study, a compound aquaculture model of P. vannamei and water spinach (Ipomoea aquatica) was used to investigate the effect of a water spinach floating raft on water quality, antioxidants, non-specific immune response, growth performance, and microbial diversity. The experimental design of this study consisted of two groups with three replicates for each, i.e., control group: aquatic monoculture (AM) system with only P. vannamei; treatment group: P. vannamei-I. aquatica raft aquaponics (AP) system with a 50% cover ratio with a water spinach floating raft. The experiment lasted for seven weeks. The results show that the concentrations of total phosphorus (TP), total nitrogen (TN), nitrate nitrogen (NO3−-N), ammonia nitrogen (NH4+-N), nitrite nitrogen (NO2−-N), and active phosphorus (AP) in the AM group were higher than those in the AP group at different sampling times. The water quality index of the AP group was better than that of the AM group, indicating that water spinach can remove the nutrients from aquaculture water bodies. The average daily gain and survival rate of shrimp in the AP group were higher than those in the AM group. The total antioxidant capacity (T-AOC), catalase (CAT), superoxide dismutase (SOD), malondialdehyde (MDA), and acid phosphatase (ACP) in the AP group were better than those in the AM group. The Shannon–Wiener and Simpson indices of the gut, water, and sediment of the AP system were significantly higher than those in the AM system, which implied a higher abundance of microorganisms in the AP system. These results demonstrate that the application of a water spinach floating raft in aquaponics can not only improve the water quality, but also improve the growth performance, antioxidant system, and non-specific immune responses of Pacific white shrimp, while increasing the abundance of microorganisms in the aquaculture system and improving the ecological benefits in terms of the expenditure.

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Section: Discussionmentioning

confidence: 52%

Effect of an Ipomoea aquatica Floating Raft on the Water Quality, Antioxidant System, Non-Specific Immune Responses, and Microbial Diversity of Penaeus vannamei in an Aquaculture System

Ruan,

Xie,

et al. 2024

Fishes

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“…In the process of removing organic matter and nitrogen and phosphorus nutrients in constructed wetlands, the oxidation of organic matter and microorganisms, respiration of animals and plants, etc., will release CO 2 . The anaerobic decomposition of organic matter will produce CH 4 , and the nitrification-denitrification process will produce N 2 O [43]. The theme of "nitrous oxide and greenhouse gas emission" shows that domestic scholars have carried out research on the key processes and mechanisms of harmful gas emissions from constructed wetlands, as well as emission reduction measures [11,44].…”

Section: Keyword Analysismentioning

confidence: 99%

Research Trends and Future Prospects of Constructed Wetland Treatment Technology in China

Liu,

Feng,

Yao

2024

Water

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With the intensification of water pollution problems worldwide, constructed wetlands, as a green, efficient, and energy-saving wastewater treatment technology, have gradually attracted the wide attention of scholars at home and abroad. In order to better understand and master the research trends of constructed wetland treatment technology in China and promote its development, the literature from 2000 to 2023 in the CNKI database and the Web of Science (WoS) database (located in China) were selected as research objects. Then, CiteSpace software (6.2.R4) was used to visualize and analyze the literature, revealing the research trends and hot areas of constructed wetland treatment technology in China. Then, the optimized way of operation effect of constructed wetland was discussed to provide a theoretical and technical basis for the wide application of constructed wetland technology in our country. The results indicate that the annual publication volume of research on constructed wetlands in China is showing a rapid upward trend. Among them, the Chinese literature mainly focuses on how to improve the application effect of constructed wetlands on nitrogen and phosphorus removal of rural domestic wastewater by matching different wetland plants or developing combined processes. The English literature from the Web of Science (WoS) database mainly focuses on how to remove emerging pollutants, such as heavy metals and resistance genes in wastewater in China, by changing the filling matrix and microbial community structure or developing new processes, and the related mechanisms have been discussed. One of the hot spots for the future research of constructed wetlands in China is to vigorously develop microbial fuel cells, and try to overcome the problem of poor purification efficiency of constructed wetlands under complex conditions such as low temperature, low carbon-nitrogen ratio, and high pollution load. In order to strengthen its application, the specific optimization methods can be divided into two categories: self-optimization strategies such as increasing oxygen supply and transfer, providing electron donor matrix, preventing matrix blockage, and combination processes coupled with anaerobic treatment and other technologies.

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“…The rates of radial oxygen loss (ROL) from the roots of V. spiralis were calculated, ranging between 58.3 and 658 µmol m −2 h −1 [25,26]. Gu et al [27] showed that the plants with extensive aerenchyma tissue transported excess oxygen to roots and diffused into their surroundings, forming an oxidation-reduction micro-environment in the rhizosphere of constructed wetlands. They also found that the plants with higher ROL exhibited better nutrients and organic matter removal than did the other plant species.…”

Section: Effects Of Submerged Macrophytes On the Sediment Characteris...mentioning

confidence: 99%

Effects of Different Submerged Macrophytes on the Water and Sediment in Aquaculture Ponds with Enrofloxacin Residues

Zhang

Liu

Zhang

2023

Water

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Submerged macrophyes have been widely used to restore aquaculture ponds in recent years. Yet, whether the residual antibiotics in ponds will affect the remediation effect of submerged macrophyes, and the effect of different submerged macrophyes on the water and sediment in aquaculture ponds with antibiotic residues, is unclear. A microcosm experiment was carried out to study the interaction between three kinds of submerged macrophytes and their growing environment with antibiotic residues. Ceratophyllum demersum L. with no roots, Vallisneria spiralis L. with flourish roots, and Hydrilla verticillata L with little roots were chosen to be planted in the sediment added with enrofloxacin (ENR). The growth of submerged macrophytes, the changes of the overlying water and sediment characteristics, and the microbial community in the sediment were analyzed. The results showed that according to the growth rate and nutrients accumulation ability, V. spiralis with flourish roots performed best among the three submerged macrophytes. The concentrations of TOC, TP, NH4+-N, and TN in the overlying water were 25.0%, 71.7%, 38.1%, and 24.8% lower in the V. spiralis treatment comparing with the control, respectively. The richness and diversity of the microorganisms in the sediment of V. spiralis treatment were significantly higher than those in the control, but this advantage was not obvious in the H. verticillata treatment. V. spiralis promoted the growth of Proteobacteria (22.8%) and inhibited the growth of Acidobacteria (32.1%) and Chloflexi (31.7%) in the rhizosphere sediment with ENR residue. The effects of the three submerged macrophytes on the removal of ENR from sediment were not reflected due to the limitation of water depth. Compared with C. demersum and H. verticillata, V. spiralis was more suitable for the remediation of the aquaculture ponds with ENR residue.

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Function of aquatic plants on nitrogen removal and greenhouse gas emission in enhanced denitrification constructed wetlands: Iris pseudacorus for example

Cited by 46 publications

References 43 publications

Effect of an Ipomoea aquatica Floating Raft on the Water Quality, Antioxidant System, Non-Specific Immune Responses, and Microbial Diversity of Penaeus vannamei in an Aquaculture System

Effect of an Ipomoea aquatica Floating Raft on the Water Quality, Antioxidant System, Non-Specific Immune Responses, and Microbial Diversity of Penaeus vannamei in an Aquaculture System

Research Trends and Future Prospects of Constructed Wetland Treatment Technology in China

Effects of Different Submerged Macrophytes on the Water and Sediment in Aquaculture Ponds with Enrofloxacin Residues

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