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 Plant Litter Submergence Affects the Water Quality of a Constructed Wetland

PLoS ONE ◽  
2017 ◽  
Vol 12 (1) ◽  
pp. e0171019 ◽  
Author(s):  
Xu Pan ◽  
Yunmei Ping ◽  
Lijuan Cui ◽  
Wei Li ◽  
Xiaodong Zhang ◽  
...  
Keyword(s):  
Water Quality ◽  
Constructed Wetland ◽  
Plant Litter

Effects of toxic cyanobacteria and ammonia on flesh quality of blunt snout bream (Megalobrama amblycephala)

2016 ◽  
Vol 97 (4) ◽  
pp. 1200-1206 ◽  
Author(s):  
Li Wang ◽  
Chuanyue Chen ◽  
Wanjing Liu ◽  
Hu Xia ◽  
Jian Li ◽  
...  
Keyword(s):  
Megalobrama Amblycephala ◽  
Blunt Snout Bream ◽  
Flesh Quality ◽  
Toxic Cyanobacteria

scholarly journals Determining agricultural land use scenarios in a mesoscale Bavarian watershed for modelling future water quality

2012 ◽  
Vol 31 ◽  
pp. 9-14 ◽  
Author(s):  
B. B. Mehdi ◽  
R. Ludwig ◽  
B. Lehner
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Agricultural Land ◽  
Hydrological Model ◽  
Land Use Changes ◽  
Agricultural Land Use ◽  
Quality Of Water ◽  
Land Use Scenarios ◽  
Farm Scale

Abstract. Land use scenarios are of primordial importance when implementing a hydrological model for the purpose of determining the future quality of water in a watershed. This paper provides the background for researching potential agricultural land use changes that may take place in a mesoscale watershed, for water quality research, and describes why studying the farm scale is important. An on-going study in Bavaria examining the local drivers of change in land use is described.

scholarly journals The Effectiveness of Aquaponic Systems with Different Types of Plants on the Water Quality of Fish Culture Media

2019 ◽  
Vol 9 (1) ◽  
pp. 81
Author(s):  
Irfan Zidni ◽  
Iskandar Iskandar ◽  
Achmad Rizal ◽  
Yuli Andriani ◽  
Rian Ramadan
Keyword(s):  
Water Quality ◽  
Culture Media ◽  
Fish Culture ◽  
Different Types

scholarly journals Designing River Diversion Constructed Wetland for Water Quality Improvement

2020 ◽  
Author(s):  
Sani Dauda Ahmed ◽  
Sampson Kwaku Agodzo ◽  
Kwaku Amaning Adjei
Keyword(s):  
Water Quality ◽  
River Water ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Stream Water ◽  
Design Procedure ◽  
Design Criterion ◽  
River Diversion ◽  
Model Equations

Constructed wetlands are recognized as viable potential technology for reducing pollution load and improving quality of water and wastewater. The use of river diversion wetlands is gaining place for improving quality of river and stream water. However, the design criterion for this category of wetlands has not been fully established, and there is a need to optimize existing approach to enhance operational performance. This chapter presents a step-by-step approach for the design of a typical river diversion constructed wetland intended to remove some pollutants and improve river water quality. The approach focused mainly on water quality objective and outlined simple criteria, guidelines, and model equations for the design procedure of a new river diversion constructed wetland. The design of constructed wetlands is generally an iterative process based on empirical equations. Thus, this approach combines simple equations and procedure for estimating the amount of river water to be diverted for treatment so as to assist the designer in sizing the wetland system. The novel approach presented may be useful to wetland experts as some of the procedures presented are not popular in wetland studies. However, this may improve existing river diversion wetlands’ design and development.

scholarly journals The influence of fish culture in floating net cages on microbial indicators of water quality

2013 ◽  
Vol 73 (3) ◽  
pp. 457-463 ◽  
Author(s):  
K. Gorlach-Lira ◽  
C. Pacheco ◽  
L.C.T. Carvalho ◽  
H.N. Melo Júnior ◽  
M.C. Crispim
Keyword(s):  
Water Quality ◽  
Fish Culture ◽  
E Coli ◽  
Physico Chemical ◽  
Fecal Streptococci ◽  
Microbiological Parameters ◽  
Thermotolerant Coliforms ◽  
Net Cages ◽  
Culture Site

This work was carried out to analyse the microbiological parameters of the water quality of a reservoir used for the irrigation and culture of tilapia (Oreochromis niloticus) in floating net cages. The physico-chemical parameters, counts of mesophilic total aerobic bacteria, total and thermotolerant coliforms and fecal streptococci, and the presence of Escherichia coli in samples of water collected in three sites of the reservoir (pre-culture site, culture site, post-culture site) were analysed. The levels of ammonia (0.047-0.059 mg/L), nitrite (0.001-0.021 mg/L) and total phosphorus (0.050-0.355 mg/L) in the water did not show significant differences (p > 0.05) between sampling sites. The levels of total bacteria in the water varied between 1.3 x 104 and 67.3 x 104 CFU/100 mL. The MPN values of thermotolerant coliforms (< 930 MPN/100 mL) were within values recommended for water used for fish culture and/or irrigation. The presence of E. coli and fecal streptococci were verified in 48% and 56% of analysed samples, respectively. The site with floating net cages showed more samples contaminated with E. coli and fecal streptococci than other sampling points.

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