scholarly journals Trends in the treatment of aquaculture effluents using nanotechnology

2021 ◽  
Vol 2 ◽  
pp. 100024
Author(s):  
Lawal A. Ogunfowora ◽  
Kingsley O. Iwuozor ◽  
Joshua O. Ighalo ◽  
Chinenye Adaobi Igwegbe
Keyword(s):  
Aquaculture Effluents

Using Chlorella vulgaris and iron oxide nanoparticles in a designed bioreactor for aquaculture effluents purification

2020 ◽  
Vol 90 ◽  
pp. 102069
Author(s):  
Majid Askari Hesni ◽  
Aliakbar Hedayati ◽  
Amir Qadermarzi ◽  
Mojtaba Pouladi ◽  
Somayeh Zangiabadi ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Chlorella Vulgaris ◽  
Oxide Nanoparticles ◽  
Aquaculture Effluents

scholarly journals LED Lighting and High-Density Planting Enhance the Cost-Efficiency of Halimione portulacoides Extraction Units for Integrated Aquaculture

2021 ◽  
Vol 11 (11) ◽  
pp. 4995
Author(s):  
Marco Custódio ◽  
Paulo Cartaxana ◽  
Sebastián Villasante ◽  
Ricardo Calado ◽  
Ana Isabel Lillebø
Keyword(s):  
Plant Density ◽  
Inorganic Nitrogen ◽  
High Density ◽  
Planting Density ◽  
Nitrogen And Phosphorus ◽  
Integrated Aquaculture ◽  
Halimione Portulacoides ◽  
White Leds ◽  
Artificial Lighting ◽  
Aquaculture Effluents

Halophytes are salt-tolerant plants that can be used to extract dissolved inorganic nutrients from saline aquaculture effluents under a production framework commonly known as Integrated Multi-Trophic Aquaculture (IMTA). Halimione portulacoides (L.) Aellen (common name: sea purslane) is an edible saltmarsh halophyte traditionally consumed by humans living near coastal wetlands and is considered a promising extractive species for IMTA. To better understand its potential for IMTA applications, the present study investigates how artificial lighting and plant density affect its productivity and capacity to extract nitrogen and phosphorous in hydroponic conditions that mimic aquaculture effluents. Plant growth was unaffected by the type of artificial lighting employed—white fluorescent lights vs. blue-white LEDs—but LED systems were more energy-efficient, with a 17% reduction in light energy costs. Considering planting density, high-density units of 220 plants m−2 produced more biomass per unit of area (54.0–56.6 g m−2 day−1) than did low-density units (110 plants m−2; 34.4–37.1 g m−2 day−1) and extracted more dissolved inorganic nitrogen and phosphorus. Overall, H. portulacoides can be easily cultivated hydroponically using nutrient-rich saline effluents, where LEDs can be employed as an alternative to fluorescent lighting and high-density planting can promote higher yields and extraction efficiencies.

Pond aquaculture effluents feed an anthropogenic nitrogen loop in a SE Asian estuary

2021 ◽  
Vol 756 ◽  
pp. 144083
Author(s):  
Lucia S. Herbeck ◽  
Uwe Krumme ◽  
Inga Nordhaus ◽  
Tim C. Jennerjahn
Keyword(s):  
Pond Aquaculture ◽  
Aquaculture Effluents ◽  
Anthropogenic Nitrogen

Biochar-TiO2 magnetic nanocomposites for photocatalytic solar-driven removal of antibiotics from aquaculture effluents

2021 ◽  
Vol 294 ◽  
pp. 112937
Author(s):  
Carla Patrícia Silva ◽  
Diogo Pereira ◽  
Vânia Calisto ◽  
Manuel A. Martins ◽  
Marta Otero ◽  
...  
Keyword(s):  
Magnetic Nanocomposites ◽  
Aquaculture Effluents

scholarly journals Phytoplankton composition and abundance as indicators of aquaculture effluents impact in coastal environments of mid Gulf of California

Heliyon ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. e06203
Author(s):  
Celia G. Valenzuela-Sanchez ◽  
Norberto M.A. Pasten-Miranda ◽  
L. Fernando Enriquez-Ocaña ◽  
Ramon H. Barraza-Guardado ◽  
J.E. Valdez Holguin ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Coastal Environments ◽  
Phytoplankton Composition ◽  
Aquaculture Effluents

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

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3418
Author(s):  
Bing Li ◽  
Rui Jia ◽  
Yiran Hou ◽  
Chengfeng Zhang ◽  
Jian Zhu ◽  
...  
Keyword(s):  
Water Quality ◽  
Constructed Wetland ◽  
High Efficiency ◽  
Fish Culture ◽  
Megalobrama Amblycephala ◽  
Blunt Snout Bream ◽  
Aquaculture Effluents ◽  
Farm Scale ◽  
Microbial Contaminants

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.

scholarly journals Photodegradation of Aquaculture Antibiotics Using Carbon Dots-TiO2 Nanocomposites

Toxics ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 330
Author(s):  
Vitória L. Louros ◽  
Liliana M. Ferreira ◽  
Valentina G. Silva ◽  
Carla Patrícia Silva ◽  
Manuel A. Martins ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Life Time ◽  
Solar Irradiation ◽  
Ex Situ ◽  
Ultrapure Water ◽  
Titanium Butoxide ◽  
Marine Aquaculture ◽  
Aquaculture Effluents ◽  
Photocatalytic Effect

In this work, carbon dots (CD) were synthesized and coupled to titanium dioxide (TiO2) to improve the photodegradation of antibiotics in aquaculture effluents under solar irradiation. Oxolinic acid (OXA) and sulfadiazine (SDZ), which are widely used in aquaculture, were used as target antibiotics. To prepare nanocomposites of CD containing TiO2, two modes were used: in-situ (CD@TiO2) and ex-situ (CD/TiO2). For CD synthesis, citric acid and glycerol were used, while for TiO2 synthesis, titanium butoxide was the precursor. In ultrapure water (UW), CD@TiO2 and CD/TiO2 showed the largest photocatalytic effect for SDZ and OXA, respectively. Compared with their absence, the presence of CD@TiO2 increased the photodegradation of SDZ from 23 to 97% (after 4 h irradiation), whereas CD/TiO2 increased the OXA photodegradation from 22 to 59% (after 1 h irradiation). Meanwhile, in synthetic sea salts (SSS, 30‰, simulating marine aquaculture effluents), CD@TiO2 allowed for the reduction of SDZ’s half-life time (t1/2) from 14.5 ± 0.7 h (in absence of photocatalyst) to 0.38 ± 0.04 h. Concerning OXA in SSS, the t1/2 remained the same either in the absence of a photocatalyst or in the presence of CD/TiO2 (3.5 ± 0.3 h and 3.9 ± 0.4 h, respectively). Overall, this study provided novel perspectives on the use of eco-friendly CD-TiO2 nanocomposites for the removal of antibiotics from aquaculture effluents using solar radiation.

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