Choosing an air flotation machine that suits your needs requires comprehensive consideration of the following aspects:
Clearly handle requirements
Wastewater characteristics: Analyze the source and water quality characteristics of wastewater, such as suspended solids concentration, oil content, pH value, and whether it contains toxic and harmful substances. Different air flotation machines have different treatment effects on different water qualities. For example, dissolved air flotation machines are suitable for treating water with low turbidity, high chromaticity, high organic content, low oil content, low surface active substance content, or water rich in algae; The vortex concave air flotation machine can effectively remove the vast majority of insoluble and floating SS as well as sinking SS in sewage
Processing objectives and emission standards: Determine the expected processing effect, such as suspended solids removal rate, organic matter removal rate, etc., as well as the corresponding emission standards that need to be met, in order to ｓｅｌｅｃｔ the type and model of air flotation machine that can meet the processing requirements
Processing capacity: Determine the required processing capacity of the air flotation machine based on the daily or hourly processing capacity of the wastewater, ensuring that the equipment's processing capacity can meet actual production or processing needs
How to choose a suitable air flotation machine?
Understand the types and characteristics of air flotation machines
Dissolved air flotation machine: By generating a large number of fine bubbles through the dissolved air system, air is attached to suspended particles in the form of highly dispersed small bubbles, achieving solid-liquid separation. Its advantages are good treatment effect, high efficiency, and wide applicability. It can treat wastewater with suspended solids concentration of 4-5g/l, and has excellent solid-liquid separation effect on loose flocs and small particles. It is commonly used for wastewater treatment in industrial enterprises such as petrochemicals, coal mines, papermaking, printing and dyeing. The disadvantage is that the equipment is relatively complex, requiring equipment such as dissolved gas tanks, air compressors, high-pressure water pumps, etc., with high investment and operating costs, and the dissolved gas release device is prone to blockage
Vortex concave air flotation machine: Using an aerator to generate microbubbles, impurities such as solid suspended solids, oil, and colloids can be directly removed from wastewater without the need for pressure dissolved air, air compressors, and circulation pumps. This simplifies the treatment process and reduces equipment investment and operating costs. It has the advantages of simple structure, strong adaptability, and low operating cost, and can treat wastewater of different water quality and quantity. However, the air flotation effect is slightly weaker compared to the dissolved air flotation machine, and when treating wastewater containing high concentrations of Ca2+and SO42-, scale is prone to adhere to the wheels and bearings of the air flotation machine, affecting system efficiency
Shallow air flotation machine: Based on the principle of "zero velocity", it realizes the movement of equipment while the water body is stationary, eliminating the influence of water disturbance on the separation of suspended particles and water. It has the advantages of low water flow velocity, high utilization rate of dissolved air, no interference in upward floating, and good skimming effect. It can effectively reduce the depth and footprint of the pool, improve treatment efficiency and water purification degree, and achieve a suspended solids removal rate of over 91%. It is widely used in sewage treatment systems in industries such as petroleum, chemical, steel, leather, power, and textile
Electric flocculation air flotation machine: Through electrolysis, colloidal particles and suspended solids in wastewater are condensed and floated, and the bubbles generated at the same time carry pollutants to the water surface to form floating slag for removal. This device has the advantages of good treatment effect, simple operation, and small footprint, especially suitable for treating wastewater containing difficult to biodegrade pollutants such as heavy metal ions and organic matter. However, the electrode material consumption of the electrocoagulation air flotation machine is relatively fast, the operating cost is relatively high, and there are certain requirements for the adaptability of water quality and electrode materials.
Pay attention to device performance parameters
Processing capacity: Ensure that the rated processing capacity of the selected air flotation machine can meet the actual wastewater treatment needs, generally slightly larger than the actual processing capacity, to reserve a certain margin and avoid long-term full load operation of the equipment affecting the treatment effect and service life
Processing efficiency: Understand the removal rate of pollutants such as suspended solids and organic matter by the equipment, as well as whether the effluent quality and other indicators can meet the expected treatment goals and discharge standards
Floor Area: ｓｅｌｅｃｔ an appropriate air flotation machine based on the actual situation of the installation site to fully utilize limited space resources. For example, compared to dissolved air flotation machines, shallow air flotation machines and vortex concave air flotation machines usually have a smaller footprint
Energy consumption: Pay attention to the energy consumption of the equipment and choose air flotation machines with higher energy efficiency to reduce long-term operating costs. The energy consumption of vortex concave air flotation machine is only 1/8-1/10 of conventional air flotation, and the operating cost is relatively low
Noise: If the equipment is installed in a place with strict requirements for noise, a low noise level air flotation machine should be selected to ensure compliance with relevant environmental requirements
Consider equipment material and durability
Material: Common materials for air flotation machines include stainless steel, carbon steel, fiberglass, etc. Stainless steel material has the advantages of corrosion resistance, wear resistance, high strength, beauty and cleanliness, and is suitable for various harsh working environments, but the cost is relatively high; Carbon steel material has high strength and hardness, can withstand large pressure and impact forces, and has low cost, but attention should be paid to corrosion prevention; Fiberglass material is lightweight, strong, corrosion-resistant, has good insulation and thermal stability, and is easy to transport and install
Durability: High quality materials and manufacturing processes can ensure the long-term stable operation of the air flotation machine, reducing maintenance costs and replacement frequency. Attention should be paid to the production process, welding quality, anti-corrosion treatment and other aspects of the equipment, as well as the reputation and after-sales service of the equipment supplier, to ensure that the equipment can operate reliably during use
Compare different brands and models
Performance price ratio: There are differences in performance, price, and other aspects among different brands and models of air flotation machines in the market. When selecting, factors such as equipment performance parameters, processing effectiveness, quality stability, and price should be comprehensively considered to evaluate cost-effectiveness. Choose equipment that can meet processing needs and has a reasonable price
Brand reputation and after-sales service: Choosing suppliers with good brand reputation ensures better product quality and after-sales service. Understand the supplier's qualifications, production scale, market reputation, as well as the equipment's warranty period, after-sales service content, response time, etc., in order to obtain timely and effective solutions when encountering problems during equipment use
Reference actual cases and user evaluations
Practical case: Understand successful cases of other enterprises or units using similar air flotation machines, including the types of wastewater treated, treatment scale, operational effects, etc., to obtain practical application experience and reference. You can conduct on-site inspections or consult relevant materials to understand the performance of the equipment in actual operation
User evaluation: Refer to other users' evaluations and feedback on different brands and models of air flotation machines, including the advantages, disadvantages, problems encountered during use, and solutions, in order to have a more comprehensive understanding of the performance and reliability of the equipment and provide reference for selection
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