Development and performance evaluation of air fine bubbles on water quality of thai catfish rearing

Abstract

Optical transparency and mechanical properties of semi-refined iota carrageenan film reinforced with SiO 2 as food packaging material AIP Conference Proceedings 1927, 030039 (2018) Abstract. The efficiency and productivity of aquaculture strongly depends on the development of advanced technology for water quality management system. The most important factor for the success of intensive aquaculture system is controlling the water quality of fish rearing media. This paper reports the design of fine bubbles (FBs) generator and performance evaluation of the system to improve water quality in thai catfish media (10 g/ind) with density (16.66 ind./L). The FBs generator was designed to control the size distribution of bubble by controlling its air flow rate entry to the mixing chamber of the generator. The performance of the system was evaluated based on the produced debit, dissolved oxygen rate and ammonia content in the catfish medium. The size distribution was observed by using a high speed camera image followed by processing using ImageJ. freeware application. The results show that air flow rate 0.05 L/min and 0.1 L/min received average bubble size of 29 μm and 31 μm respectively. The generator produced bubbles with capacity of 6 L/min and dissolved oxygen rate 0.2 ppm/min/L. The obtained DO growth was 0.455 ppm/second/L while the average decay rate was 0.20 ppm/second/L. (0.011/0.005 fold). In contrast, the recieved DO growth rate is faster compared to the DO consumption rate of the Thai catfish. This results indicated that the potential application of FBs enhanced the density of thai catfish seed rearing. In addition, ammonia can be reduced at 0.0358 ppm/hour/L and it is also observed that the inhibition of bacterial growth of air FBs is postive to Aeromonas hydrophila bacteria compared to the negative control. It is concluded that as-developed FBs system can be potentially applied for intensive thai catfish culture and expected to improve the feeding efficiency rate.

Nitrogen Recovery via Aquaponics–Bioponics: Engineering Considerations and Perspectives

“…Microbubbles and nanobubbles uniquely have a long-lifetime in the aqueous phase which help to maintain high DO levels. , Aeration using microbubbles and nanobubbles improves the water quality and maintains a productive aquatic environment by enhancing the activities of microorganisms, including microbes that utilize organic carbon (heterotrophs) and inorganic nitrogen (nitrifiers). , Microbubbles and nanobubbles diffuse more easily inside the spaces and pores of particles, preventing anoxic microenvironments. These bubbles also enhance the activities of beneficial microorganisms in the aqueous phase and sediments, such as nitrification, organic carbon removal, and control of pathogens and methanogens. − Aeration with microbubbles and nanobubbles reduced free ammonia level that are inhibitory to fish: situations that occur at low DO conditions induced by high organic matter. ,, Nanobubble generation also leads to the formation of reactive oxygen species (ROS) . ROS not only have the ability to inactivate pathogens in aquaculture but also indirectly inhibit the growth of pathogens by maintaining a high abundance of beneficial aerobic microbes that outcompete pathogens. , Integrating microbubble and nanobubble aeration with aquaponics–bioponics, as opposed to conventional aeration, could lead to better nitrogen recovery, higher fish and plant yields, and improved water quality.…”

“…108−110 Aeration with microbubbles and nanobubbles reduced free ammonia level that are inhibitory to fish: 111 situations that occur at low DO conditions induced by high organic matter. 107,109,110 Nanobubble generation also leads to the formation of reactive oxygen species (ROS). 112 ROS not only have the ability to inactivate pathogens in aquaculture but also indirectly inhibit the growth of pathogens by maintaining a high abundance of beneficial aerobic microbes that outcompete pathogens.…”

Growth of Striped Catfish Fingerlings (Pangasianodon hypophthalmus) in Aquaponic System with Fine Bubbles (FBs) Application

“…The decrease in ammonia concentration shows the application of FBs works to improve water quality in the aquaponic system through the diffusion of dissolved oxygen in the water. According to Subhan et al [8], the use of FBs can reduce the concentration of ammonia in the maintenance of catfish seedlings with a decrease in ammonia by 0.0358 ppm / hour / L, FBs technology is able to reduce the concentration of ammonia because air bubbles are produced in the water and are also very small sized. These small, nano and micro sizes are able to accelerate the diffusion of ammonia gas in water to the air surface.…”

“…FBs generators are designed to control the bubble size distribution by controlling the pressure that enters the generator [8]. The size of the bubbles produced is affected by the combination of pressure and airflow rate used.…”

Hydroxyl Radical-Based Advanced Oxidation Processes of Red Reactive Dyes by Ultrafine Bubbles Method

“…Furthermore, NB-enriched water has unique physicochemical properties compared to water without NBs [15]. Nanobubbles present high mass transfer efficiency and oxidation ability because of the increased gas-liquid contact area and the generation of hydroxyl radicals when collapsing [16][17][18].…”