No abstract

Over the past decade, Vietnam's shrimp industry has made great progress and brings Vietnam into the rank of the world's largest shrimp exporters. The development trend of the shrimp industry in the world as well as in Vietnam today is in the direction of intensive and super-intensive farming, technology innovation to enhance productivity and quality. However, the shrimp farming industry in Vietnam is facing many difficulties; one of them is the problem of environmental pollution, raising negative impact on the economic effectiveness of farming. Causes are mainly due to excess food and untreated shrimp waste, accumulated on the pond bottom surface and disintegrated to reduce dissolved oxygen concentration, release toxic gases such as NH 3 , H 2 S and create a favorable environment for harmful microorganisms to develop. Therefore, it is necessary to have a countermeasure to thoroughly remove waste from the farming environment. This paper introduces a general design of a waste remover, which is needed for shrimp farming ponds to remove waste and solve the mentioned problem. This equipment moves on the bottom surface of the pond and can be autonomous or manually remote controlled. During working process, the equipment brushes waste on the bottom surface of the pond and suck it into the filter bag. The waste remover includes such following main units: travelling unit, brushing unit, sucking unit, frame unit, transmission and control systems. The equipment uses the principle of axial pumping, sucks waste along the water stream by reducing the pressure inside the equipment and transfers waste into filter bags. This general design basically meets the requirement of waste removal and can be a fundamental for designing the detailed units, manufacturing and experiment implementation of equipment in the future. [1][2][3][4][5][6][7][8][9] Cite this article : Truyen L T, Long L T. The waste remover in aquaculture ponds. Sci. Tech. Dev. J. -Engineering and Technology; 2(SI):xxx-xxx.

The development of new technologies in automation to increase labor productivity has been increasingly enhanced in recent decades. The problem of cleaning water in shrimp ponds greatly affects the quality as well as shrimp production. Environmental pollution of shrimp farming is a matter of concern because the current waste treatment solutions are not yet thorough. A waste remover of shrimp waste combined with pond bottom siphon method has been researched and developed to increase the ability to thoroughly handle waste generated in the culture environment. This device helps to automate the manual cleaning of the pond bottom by farmers. The device performs operations to clean waste, suck, filter and remove waste from the culture environment. This device is self-propelled or manually controlled and operates in all weather conditions. This article introduces the process of testing and evaluating the efficiency of waste extraction equipment in shrimp ponds. The device was tested at a super intensive shrimp farm and evaluated for operational efficiency. The experimental model consists of a shrimp pond operating a waste suction device, a control pond, an automatic monitoring system of water quality parameters (DO, H 2 S, NH 3 , pH and temperature). Experimental ponds operating waste disposal equipment, control ponds are manually cleaned, other farming conditions of the two ponds are similar. The impacts of waste on shrimp culture environment are determined through analyzing the results of measuring water quality criteria in the pond, thereby assessing the efficiency of waste removal of the equipment. The measurement results show that water quality parameters reach a value within the threshold if operating a waste suction device once per day. The benefits of waste remover operate are to help save the cost of labor to clean the pond bottom, protect workers' health.