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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Comparative Study on Paddle-wheel Aerators Using Electric Motors and Diesel Engines in Pacific White Shrimp (Litopenaeus vannamei) Culture Ponds) ผู้เขียน: ดร.วราห์ เทพาหุดี, รองศาสตราจารย์ ,  Mathud Benjaprasertsri, Bunyat Sattiti สื่อสิ่งพิมพ์:pdf AbstractThe purpose of the study was to compare water velocity, water quality, soil quality, production and energy costs of two paddle-wheel aerator systems, operated by electric motors and diesel engines, commonly used in shrimp farms. The study was separated into two experiments. The first experiment focused on water velocities produced by paddle wheel aerators using different rotational speeds. Research found that water velocity could not be measured at a distance of 25 meters away from the front of both systems’ aerators at all the different speeds. The second experiment was performed in an intensive Pacific white shrimp farm. Three of the ponds were aerated using six long-armed paddle-wheel aerators, powered by two 11 hp diesel engines. The other three were aerated by six long-armed paddle-wheel aerators and used four 2 hp electric motors. Each paddle-wheel aerator was installed 25 meters apart. The results showed the ponds powered by the diesel engines obtained greater average production and higher average profit compared to the pond powered by the electric motors. This was because the paddlewheel aerators using diesel engines could produce greater water velocity than the electric motors system. Consequently, they provided more dissolved oxygen to the water, cleaner feeding area, and removed the waste and sediment to the center of the pond more efficiently, which are important factors for the success of shrimp culture. |
 ที่มา:ทุนส่วนตัวหัวเรื่อง:การศึกษาประสิทธิภาพของเครื่องเติมอากาศ |
ที่มา:Kasetsart Journal (Natural Science)(วารสารวิทยาสารเกษตรศาสตร์ สาขาวิทยาศาสตร์)หัวเรื่อง:Comparative study on paddle-wheel aerators using electric motors and diesel engines in Pacific white shrimp (Litopenaeus vannamei) culture ponds |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Applications of Paddle Wheel Aerators and Diffused-Air System in Closed Cycle Shrimp Farm System) ผู้เขียน:ดร.วราห์ เทพาหุดี, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractShrimp culture practices are changing from high water exchange systems to low water exchange systems to reduce the risk of disease contamination and water pollution. The low water exchange systems require a great number of aerators to prevent water deterioration due to high organic loading associated with limited water exchange. However, high rates of aeration can not only cause excessive water currents and erode pond bottom badly but also increase power cost. In this present study, applications of paddle wheel aerators and diffused-air systems were investigated in grow-out ponds of a closed cycle farm. The results showed that these systems were successful used in shrimp production, and of the systems examined, a combination of paddle wheel and medium bubble size diffused-air system, with a polyethylene pipe network proved to be most effective and convenient. This aeration system provided suitable dissolved oxygen concentrations to the water body and the pond bottom, which could stimulate decomposition at the pond bottom. In addition, this system had low operating costs. It is suitable to be applied in low water exchange culture systems and it can also reduce problems of pond bottom erosion, a typical problem, when using large numbers of paddlewheels. |
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ที่มา:การประชุมวิชาการ ครั้งที่ 47 มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:การศึกษาเบื้องต้นของการแสดงออกของยีนฮีตช็อคโปรตีนในเนื้อเยื่อที่แตกต่างกันของปลานิล |