The low moisture content of the scum produced by the high-efficiency dissolved air flotation machine offers significant advantages for subsequent dewatering. This characteristic not only simplifies the treatment process, but also reduces energy consumption and costs, while also increasing the potential for resource recovery. Low moisture content in the scum means less free water, resulting in a relatively high proportion of bound water adhering to the surface of the solid particles. However, pretreatment with the high-efficiency dissolved air flotation machine renders the scum structure loose and porous, creating favorable conditions for subsequent dewatering. This pretreatment ensures effective dewatering of the scum before entering the dewatering equipment without the need for the addition of large amounts of flocculants, thereby reducing the use of chemical agents.
In terms of dewatering efficiency, the low-moisture scum's initial state is closer to the dewatering endpoint, significantly shortening the dewatering equipment's operating time. For example, conventional high-moisture scum may require lengthy filtration or centrifugation to meet discharge standards. However, scum treated with the high-efficiency dissolved air flotation machine can reduce dewatering time by over one-third using the same equipment. This increased efficiency translates directly into increased equipment capacity, significantly increasing the daily scum volume that can be processed by a single dehydrator, meeting the needs of large-scale wastewater treatment.
From an energy perspective, the dehydration process for low-moisture scum requires less mechanical work. In the filter press dehydration process, every 10% reduction in moisture content reduces the filter press motor load by approximately 15%. This not only reduces electricity consumption but also reduces equipment wear and extends service life. For centrifugal dehydrators, low-moisture scum has a higher solids content, creating less resistance during drum rotation, further reducing energy consumption. This energy optimization can accumulate into significant cost savings over the long term.
In terms of resource utilization, low-moisture scum has a higher calorific value and lower transportation costs. If the scum contains combustible components such as oil or organic matter, the dried scum can be used directly as a fuel alternative, with its calorific value utilization rate increasing by over 20% compared to high-moisture scum. Furthermore, a low moisture content means a higher proportion of active ingredients per unit weight of slag, reducing the number of vehicles required to transport the same amount of dry material and lowering logistics costs. This resource recovery approach not only solves waste disposal issues but also creates economic value.
In terms of environmental compliance, slag with low moisture content is more likely to meet emission standards. High-moisture slag can cause secondary contamination from leachate during storage or landfill. However, dried slag is significantly smaller, significantly reducing leachate generation and minimizing environmental risks. Furthermore, some industries have clear limits on slag moisture content. The pretreatment effects of high-efficiency dissolved air flotation machines can directly help companies meet regulatory requirements and avoid penalties for exceeding emission limits.
In terms of equipment compatibility, slag with low moisture content causes less wear and tear on dewatering equipment. Slag with high moisture content may contain sharp particles or corrosive substances, which can accelerate the wear and tear of equipment components during the dewatering process. After treatment with the high-efficiency dissolved air flotation machine, the scum particles become more uniform and the concentration of corrosive components is reduced. This extends the service life of key components such as filter press cloths and centrifuge drums, reduces maintenance frequency, and indirectly reduces operating costs.
By reducing the moisture content of the scum, the high-efficiency dissolved air flotation machine provides comprehensive advantages for subsequent dewatering, from efficiency, energy conservation, resource utilization, and environmental compliance. This pretreatment effect not only improves the overall economic efficiency of the wastewater treatment system but also promotes the transformation of waste into resources, aligning with the development of a circular economy. With increasingly stringent environmental standards, this feature of the high-efficiency dissolved air flotation machine will become a key driver of its widespread application in water treatment.
