Abstract
Microbial fuel cell (MFC) was considerable as a promising saline wastewater treatment which using microorganism to convert organic compounds to electrical energy. Most of wastewater generated from aquaculture farming contained highly saline effluents. In addition, the maintenance of good water quality was essential for optimum growth and survival of shrimp. This study aimed to evaluate the ability of Membrane-less Microbial Fuel Cells (MFCs) to treat wastewater for recirculation of shrimp culture wastewater, and improvement in the growth performance of Penaeus vannamei (White Leg Shrimp). Six MFCs models were built with locally available materials such as: polyvinyl chloride (PVC), anaerobic sludge, carbon cloth anode and cathode electrodes, granular graphite, glass wool and glass bead. This study compared two different treatments including: control (cultivation with no MFCs models) and MFCs models (application models with shrimp culture), run in continuous mode at room temperature (250C – 30oC). Each treatment was run in triplicate with shrimp at size PL30-PL45, average initial weight of 0.91 +/- 0 (g) and average initial length of 3.03 +/- 0.6 (cm). Experiments were set up using the 120 L tanks (working volume of 90 L), input with seawater at 20 ppt salinity, temperatures range of 22◦C to 26◦C, pH range of 7.5 to 9.4, and dissolve oxygen range of 5.5 to 7.2. The density of shrimp was 5 post larvae (PL) per liter. Research results achieved the removal of chemical oxygen demand, ammonia, nitrite and nitrate were up to 58.83%, 76.1%, 56.33% and 70.90%, respectively. The survival rate of shrimp was maintained, and growth rate was enhanced significantly compared with control treatment. The obtained results in this study presented that MFCs has ability to treat pre-circulation of shrimp culture wastewater and improved in the growth performance of Penaeus vannamei (White Leg Shrimp).
Highlights
Vietnam is one of the largest shrimp exporters in the world 1
The maintenance of good water quality was essential for optimum growth and survival of shrimp
This study aimed to evaluate the ability of Membrane-less Microbial Fuel Cells (MFCs) to treat wastewater for recirculation of shrimp culture wastewater, and improvement in the growth performance of Penaeus vannamei (White Leg Shrimp)
Summary
Vietnam is one of the largest shrimp exporters in the world 1. Most farms suffered from disease outbreaks during 2013– 2016 in Viet Nam; some events were not controllable and caused total loss of stock 2. Shrimp farming has raised concerns about water pollution of the surrounding environment 3. The wastewater from shrimp farming usually high in nutrients and chemicals which can pollute the water bodies. Previous studies reveal that because of unplanned shrimp farming development in many provinces in Vietnam, the surrounding waters have been polluted by wastewater from shrimp farmsc 4. The decomposition of organic matter may produce ammonia (in form of unionized ammonia NH3 and ammonium ion NH4) and nitrite (NO2). Concentration of these compounds increases with a higher loading rate of organic matter 7
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