Dissolved Air Flotation machine assists in the treatment of aquaculture wastewater, effectively removing suspended solids
News 2023年8月17日 112
Aquaculture wastewater is a common source of pollution, containing a large amount of suspended solids and other harmful substances, which pose a serious threat to the environment and water quality. To effectively treat aquaculture wastewater, many treatment methods and technologies have been widely used in practice, including the method of removing suspended solids using Dissolved Air Flotation machine（DAF）.
The principle of DAF to remove suspended solids is mainly to use the adsorption effect between microbubbles and suspended solids, making the suspended solids float to the water surface, thereby achieving removal. DAF injects air into the wastewater, producing microbubbles. When the microbubbles combine with the suspended solids, due to the density difference, the suspended solids gradually float to the water surface, forming foam. By collecting and removing the foam, the suspended solids are effectively removed.
To verify the effectiveness of removing suspended solids using dissolved air flotation, a series of experiments were conducted. Different types of aquaculture wastewater were selected for the experiments, and different treatment conditions and parameters were set for different experimental groups. The dissolved air flotation machine used in the experiment was a dissolved air flotation machine, and the operation process was as follows: introduce the wastewater into the dissolved air flotation machine, pressurize the air to dissolve it in the wastewater, and then release it at normal pressure to produce micro bubbles that combine with suspended solids and float to the surface. During the experiment, parameters such as the removal rate of suspended solids, the number and size of micro bubbles, and the water quality of the wastewater were recorded.
The experimental results showed that the effect of removing suspended solids using dissolved air flotation was significant, with a removal rate reaching 99%. In the experiment, we found that the number and size of micro bubbles had an important influence on the removal effect of suspended solids. When the number of micro bubbles was small or their size was large, the removal effect of suspended solids was poor; while when the number of micro bubbles was moderate and their size was small, the removal effect of suspended solids was best. In addition, the water quality of the wastewater also had a certain influence on the removal effect of suspended solids. When there were many impurities in the wastewater, it would affect the adsorption between micro bubbles and suspended solids and reduce the removal effect.
Through experiment verification and analysis, we concluded that: removing suspended solids in aquaculture wastewater using dissolved air flotation is an efficient and environmentally friendly treatment method. Under appropriate operating conditions, a removal rate of 99% can be achieved. However, in practical applications, factors such as wastewater quality and treatment costs also need to be considered. To improve the removal effect of suspended solids, further optimization of the design and operating parameters of the dissolved air flotation machine can be carried out, such as improving dissolved gas efficiency, increasing the number of micro bubbles, and improving wastewater pretreatment.