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The Potential of Floating Treatment Wetlands for Pollutant Removal in the Recirculating Aquaculture System of Catfish

100%

Oktaviyani D. , Pratiwi N. T. M. , Krisanti M. , Chrismada T. , Susanti E.

Journal of Ecological Engineering

2024

tom Vol. 25, nr 4

111--118

Floating treatment wetland (FTW) as a wastewater processing technology in recirculating aquaculture systems (RAS) of catfish is considered to be effective in eliminating the pollutant load of nitrogen, phosphorous, and organic matter. This research aims to reduce the concentration of pollutant loads and obtain an effective ratio between the volume of the FTW and the total water volume of the catfish RAS. The FTW system uses Vetiveria zizanoides grown on floating media and equipped with an aerator in the bottom layer of the pond. Several FTW volume ratios were used to determine an FTW system that is effective in reducing pollutant loads according to the mass balance concept. This approach was conducted to maintain acceptable water quality in catfish cultivation ponds. The study results showed that most pollutant load concentrations decreased in all ponds. The largest removal percentage included the parameters TAN, COD, TSS, TP, nitrate, phosphate, and TN, namely 88.54%, 66.17%, 85.68%, 91.30%, 83.85%, 61.46%, and 44.68%, respectively. The effective ratio between the volume of the FTW processing system and the total water volume of 0.543 with an age group of fish of 9–12 weeks was able to eliminate the pollutant loads from catfish pond wastewater.

Effectiveness of Floating Treatment Wetlands with Cyperus papyrus Used in Sub-Humid Climate to Treat Urban Wastewater: A Case Study

88%

Benrahmane L. , Mouhir L. , Kabbour A. , Laaouan M. , El Hafidi M.

Journal of Ecological Engineering

2022

tom Vol. 23, nr 7

157--168

The wastewater from small communities and rural areas, usually discharged in an unsuitable manner, requires an appropriate treatment. The floating treatment wetland has revealed a great potential due to good performance, low cost and low maintenance means of improving water quality over a broad range of applications. The aim of this article was to present the results of the adaptation period (57 days) of a macrophyte plant “Cyperus papyrus” and its potential for treating wastewater generated by the campus of the National Office of Electricity and Drinking Water (ONEE) of Rabat. Two hydraulic retention times were applied: 2 and 4 days. Pilot experimental setups (two tanks) were installed: one tank where the macrophyte, being the subject of the study, was installed and the other served as a control. The macrophyte plants were suspended in floating mat, keeping the plant roots permanently in contact with the water and removing pollutants via several processes. During the adaptation of the plant which concerned four parameters: the evolution of the density, the height of the stems, the number of shoots as well as the state of health of the plants, a period of adaptation to the medium of implantation of fifty-seven days was observed. Along this adaptation phase, the results showed that: plant density increased from 9 to 29 units; the heights of the four identified stems of Cyperus papyrus increased from 15, 6, 11 and 8 cm to 73, 43, 30 and 24 cm, respectively; the appearance of 72 shoots and the plant has completed the adaptation phase in good health (absence of disease Symptoms). The treated water obtained from outlet and wastewaters were analyzed for various water quality parameters, such as Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD), and Suspended Solids (SS). The floating treatment wetlands system is able to remove 37.8% of COD; 47.6% of BOD5and 74.4% of SS for HRT of 2 days and 63.7% of COD; 78.4% of BOD5 and 89.1% of SS for HRT of 4 days. Moreover, it was found that the purification efficiency in terms of these three pollution parameters is all the more important as the hydraulic retention time is high.