【摘要】 针对人工湿地内部DO含量较低引起的生物性堵塞,污水处理效率下降的问题,采用投加释氧材料的方法来提高湿地内部DO含量,修复生物性堵塞。采用CaO₂为释氧剂制备释氧材料,进行释氧性能研究。结果表明:采用大孔弱酸性丙烯酸系阳离子交换树脂作为包埋剂制成的释氧材料释氧性能最佳。在模拟人工湿地污水系统中,释氧材料可使反应器中DO质量浓度在15d内保持在5.0mg/L以上,并且pH保持中性水平,相较未投加释氧材料的对照组,30d内COD的平均降解效率提高125%。投加释氧材料可以使发生生物性堵塞的人工湿地系统在连续运行条件下基质孔隙率在15d内恢复到初始水平的83%左右,并且相较机械曝气具有操作便捷、不受环境限制以及成本低廉的优点。更多还原

【Abstract】 Aiming at the problem of biological clogging and the decline of sewage treatment efficiency caused by low DO content in the constructed wetland,DO in wetland was improved and biological clogging was repaired by adding oxygen releasing material.CaO₂ was used as oxygen releasing agent to prepare oxygen releasing material,and study the performance of oxygen release.The results showed that the oxygen release performance of the oxygen releasing material made from the macroporous weak acid acrylic acid cation exchange resin as the entrapment agent was the best.In simulated wetland sewage treatment system,oxygen releasing material could kept DO concentration above 5.0 mg/L in 15 days and maintain pH at neutral level.Compared with the control group with no oxygen releasing material,the average degradation efficiency of COD in 30 days could be increased by 125%.The matrix porosity of the constructed wetland system with biological clogging could be restored to 83% of the initial level in 15 days.Compared with mechanical aeration,it had the advantages of convenient operation,unrestricted environment and low cost.更多还原