As a critical piece of equipment that leverages centrifugal force to achieve material separation, centrifuges are widely used across various fields—such as biomedicine, food processing, and environmental monitoring—thanks to their efficient and precise separation capabilities. Heng'er Biotech specializes in the research and development of tabletop centrifuges, offering high-speed and low-speed product lines that stand out for their compact footprint, user-friendly operation, and reliable separation performance. These models have become the preferred choice for laboratories and small-to-medium-sized production lines in diverse industries. Below, we’ll explore the application principles, equipment selection criteria, and tangible outcomes of Heng'er Biotech’s tabletop centrifuges through real-world cases in the biomedical sector, highlighting their core value in specialized scenarios.

Environmental Monitoring Field: Sewage Suspended Solids Separation and Water Quality Analysis

In water quality testing for municipal sewage and industrial wastewater, separating suspended solids (SS) from the water is a critical step. This requires centrifugal separation to obtain a sample of suspended solids, which is then analyzed to determine the level of water pollution. Previously, an environmental monitoring station used centrifugal equipment with insufficient rotational speed, failing to fully separate even the smallest suspended particles in the water. As a result, the test results were consistently lower than expected, compromising the development of effective pollution control strategies. 

(1) Application Requirements and Challenges 
The monitoring station needs to analyze 15–20 sewage samples daily, with each sample measuring 50 mL. It is required to separate suspended particles ranging from 2 to 20 μm in diameter from the water, ensuring a particle recovery rate of at least 90%. After centrifugation, the resulting supernatant must remain highly transparent, free from any noticeable impurities. Additionally, since the sewage samples exhibit some corrosive properties, the equipment must be equipped with corrosion-resistant capabilities. Furthermore, the testing procedure must comply with the national standard "Water Quality – Determination of Suspended Solids – Gravimetric Method," and the centrifugation parameters must be precisely adjustable and clearly recorded for easy data traceability. 

(2) Centrifuge Selection and Application Principles 
Choose the Heng'er Biotech Desktop Low-Speed Centrifuge (Model: PC1204), which features a speed range of 0–3,000 r/min and is equipped with a corrosion-resistant PTFE rotor. It can accommodate up to four 300 mL centrifuge tubes and supports precise setting and data storage of key centrifugation parameters—such as speed, time, and temperature—ensuring full compliance with testing standards. Its low-speed, high-capacity design not only guarantees thorough sedimentation of suspended particles but also prevents tube-wall adsorption issues often caused by high-speed centrifugation, thereby enhancing recovery rates. 
During the analysis, shake the wastewater sample thoroughly before transferring it into a 300 mL centrifuge tube. Place the tube into the rotor of the equipment, set the speed to 5,000 r/min, the centrifugation time to 25 minutes, and the temperature at 25°C (ambient temperature for this test). During centrifugation, suspended solids in the water—having a density of 1.2–1.3 g/cm³—will settle toward the bottom of the tube under centrifugal force, forming a sediment layer. The upper portion will remain as a clear supernatant, which can then be used for subsequent analyses of parameters such as COD and ammonia nitrogen. After centrifugation is complete, carefully pour off the supernatant and proceed to dry and weigh the sediment layer at the tube’s bottom, thereby calculating the concentration of suspended solids. Additionally, the equipment’s parameter storage function automatically records the centrifugation conditions for each batch of samples, facilitating easy data retrieval and traceability while ensuring compliance with the monitoring station’s quality control requirements. 

(3) Application Outcomes 
After using the Heng'er Biotech desktop low-speed centrifuge, the recovery rate for suspended solids detection in station wastewater increased from the original 82% to 93%. The accuracy of the test data now meets national environmental protection standards, providing a reliable basis for developing pollution control strategies. Additionally, the centrifugation time per sample was reduced from the previous 35 minutes to 25 minutes, allowing the daily testing capacity to rise from 15 samples to 22—significantly boosting monitoring efficiency. Moreover, the equipment’s corrosion-resistant rotor boasts a service life of up to 3 years, substantially cutting down on costs associated with replacing easily worn components. Meanwhile, the built-in parameter recording function eliminates the tediousness of manual data entry, minimizing human error and further streamlining the entire testing process.