水产养殖中复合精确自动增氧技术研究

Technology of Green Accurate Oxygen Enhancement in Aquaculture

提出了一种日常情况下利用耕水机改善水质和应急情况下采用叶轮增氧机增氧的复合自动增氧模式。耕水机通过太阳能电池驱动昼夜不停耕动水体,不仅释放了底层水体有害物质,而且通过水体中藻类的光合作用极大提高了整个水体溶解氧浓度,大幅减少了叶轮增氧机应急增氧时间。水体溶解氧浓度通过ZigBee无线传感网络实时监控,低于设定下限值时,启动应急变频增氧,高于上限时停止增氧,控制方式采用增量式PID控制。试验结果表明,复合增氧方式与单一增氧方式相比,节省了约65%的电能、80%的人力成本和20%的药品等,总体利润增加20%以上。

High-density mode was widely adopted in China＇s aquaculture,and single manual control of the mechanical oxygenation mode was chosen. To ensure safety,an extensive over-anaerobic mode was used,but the security was still difficult to improve. Human resources and electricity were wasted. A new type of automatic oxygen enrichment model was proposed,which utilized a biofan to improve the water quality and increase oxygen in the case of an emergency. The biofan was driven by solar battery,which circulated water day and night. It not only released the harmful substances in the bottom water body,but also greatly improved the dissolved oxygen content of the whole water body through the photosynthesis of the algae in the water body. It led to a significant reduction in the impeller aerator time to oxygen.Through the comparison test, it was found that the variation of dissolved oxygen concentration in automatic control mode was less than that in single oxygenation model in 24 h. By measuring and analyzing the dissolved oxygen content at 0. 6 m and 1. 0 m below the water,it can be seen that the difference of dissolved oxygen content in the upper and lower layers in automatic control mode was smaller than that in the single control mode. It was mainly because the upper and lower water bodies continued to cycle in automatic control mode. The concentration of dissolved oxygen in water was monitored by Zig Bee wireless sensor network in real time. When the dissolved oxygen concentration was lower than the set lower limit,impeller aerator was automatically activated,and when it was higher than the set upper limit,impeller aerator was stopped to achieve the purpose of accurate oxygen. Incremental PID control mode was adopted.