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 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.

scholarly journals Physicochemical and microbiological evaluation of surface water quality of aquaculture ponds Located in Savar, Dhaka, Bangladesh

2021 ◽  
Vol 9 (2) ◽  
pp. 138-146
Author(s):  
Sharmin Sultana ◽  
Amisha Chowdhury ◽  
Tahmina Sultana ◽  
Khorshed Alam ◽  
Ruhul A Khan
Keyword(s):  
Water Quality ◽  
Surface Water Quality ◽  
Chloride Content ◽  
Pond Water ◽  
Viable Count ◽  
Heavy Metal Accumulation ◽  
Fish Culture ◽  
Fish Pathogens ◽  
Standard Value

Aquaculture is one of the most vital sectors in Bangladesh as it exhibits a major role in nutrition, livelihoods and foreign exchange incomes/earnings every year. However, due to chemical impurities, infectious diseases caused by microorganisms, heavy metal accumulation, and aquaculture in Bangladesh is gradually declining and posing serious health risks. In Savar, which is one of the major industrial zones in Bangladesh, all industrial sewage and wastes severely deteriorate the water quality of the ponds, rivers, lakes and various waterways that are involved in aquaculture/fish culture. Hence, to determine the water quality by assessing different physicochemical and microbiological parameters, water samples were collected from five selected ponds located in Atomic Energy Research Establishment premises, Savar, Dhaka and analyzed according to the standard procedures. The obtained values of temperature, pH, Salinity, TDS, TA, EC, TH, Chloride content, Free CO2, DO, Nitrate and Sulfate were compared with the recommended values of Bangladesh and WHO standard for suitable water quality. Most of the physicochemical parameters exceeded the Standard value. Total Viable Count, Total Coliform and Fecal Coliform Count were also found to be higher than the standard value of WHO indicating fecal contamination of the pond water. Some fish pathogens were also isolated from the ponds. Water quality index (WQI) was calculated for five sampling sites to determine the level of pollution. It was observed that the water quality of the all the ponds reached to critical point of pollution. It is therefore, a high time to take initiatives to save the ponds that are involved in aquaculture from further pollution. The results revealed that the pond waters of five different sites were excessively polluted and unsuitable for fish culture.

scholarly journals Conventional and contemporary methods for water treatment: From wastewater to ultra pure water

2003 ◽  
Vol 57 (7-8) ◽  
pp. 307-317 ◽  
Author(s):  
Vladana Rajakovic ◽  
Ljubinka Rajakovic
Keyword(s):  
Water Quality ◽  
Water Purification ◽  
High Efficiency ◽  
Membrane Separation ◽  
Pure Water ◽  
Water Protection ◽  
New Methods ◽  
Methods And Techniques ◽  
Controlling Processes

In this paper modern methods and techniques for water purification are described. Good water quality and the rational use of water are an absolute need of the new millennium. The quality of life depends on water quality. Although it is an ecological priority to prohibit the contamination of water, it is a responsibility for environmental engineers and chemists to develop and apply effective methods for water purification. Beside well-known methods and techniques, it is necessary to create new methods for water purification and treatment. Water recycling is especially important. Plants with membrane separation technologies enable savings in fresh water with high efficiency. Methods for monitoring and controlling processes and water protection should be developed simultaneously with the development of techniques for the methods for purification.

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.

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