通气量及曝气密度对微孔曝气器充氧性能影响的中试研究

通气量及曝气密度是曝气系统重要的运行参数,在中试条件下,以充氧能力和氧利用率为评价指标,研究了橡胶膜及刚玉微孔曝气器在不同通气量及曝气密度下充氧性能的变化规律。结果表明:橡胶膜微孔曝气器的充氧能力随通气量及曝气密度的增大而增大,氧利用率随通气量及曝气密度的提高先增大后减小。刚玉微孔曝气器充氧能力随曝气密度的增大而增大,氧利用率随通气量的增大而减小,而随曝气密度的增大先增大后减小。橡胶膜微孔曝气器氧利用率最大时,其最佳通气量为3.0 m3/h时,最佳曝气密度为4.5%~5.5%,刚玉微孔曝气器最佳曝气密度为11%~15%。

PILOT STUDY ON INFLUENCE OF AIR FLOW RATE AND DIFFUSER DENSITY ON OXYGENATION PERFORMANCE OF FINE-PORE DIFFUSER IN AERATION SYSTEM

Air flow rate and diffuser density are two important parameters of aeration system． In order to study the rules of oxygenation performance of fine-pore membrane and ceramic diffuser under different air flow rate and diffuser density on pilot scale research，oxygenation capacity and oxygen transfer efficiency were used as evaluation indexs． For the fine-pore membrane diffuser，the results showed that the oxygenation capacity increased with improving air flow rate and diffuser density． Oxygen transfer efficiency increased when air flow rate was from 0 to 3. 5 m3 /h，and then decreased when air flow rate was from 3. 5 m3 /h to 8. 0 m3 /h． As diffuser density increased，the oxygen transfer efficiency decreased first，then increased． For the ceramic diffuser，the results showed that the oxygenation capacity increased with improving diffuser density． Oxygen transfer efficiency decreased with air flow rate increased． As diffuser density increased，the oxygen transfer efficiency increased firstly， then decreased． The optimum air flow rate of single fine-pore membrane diffuser was about 3. 0 m3 /h and the optimum range of diffuser density was 4. 5% ～ 5. 0%， the optimum range of diffuser density of ceramic diffuser was 11% ～ 15%．