固定化三维电极-生物膜法去除污水中硝酸盐氮

本研究将固定化细胞技术用于三维电极-生物膜反应器的阴极微生物挂膜,对现有的三维电极-生物膜反应器进行了改进。同时,以城市污水二级生化处理系统的出水为研究对象,利用自制的固定化三维电极-生物膜反应器进行了反硝化深度脱氮试验。考察了电流强度、HRT、不同C/N值等因素对硝态氮和COD去除率的影响,并通过对比试验证实了固定化细胞技术的使用可提高反应器的反硝化性能。试验结果表明,在电流强度30mA,进水流量9mL/min时,COD的去除率为50%,硝态氮的去除率可达82.03%,反应器NO3--N负荷为0.297mg NO3--N(/cm2.d);同等操作条件下,采用固定化方法挂膜的反应器的脱氮效率可比普通反应器提高20%以上。

Study On Removal of Nitrate from by Secondary Effluent Immobilized Three-dimension Electrode-biofilm Reactor

The immobilized cell technology was applied in the three-dimension electrode-biofilm reactor for helping the microorganisms to link onto the cathodes.The existing three-dimension electrode-biofilm reactor was improved.Continuous treatment experiments using a secondary effluent containing nitrate were carried out to investigate the advanced denitrification performances by a self-made immobilized three-dimension electrode-biofilm reactor.Various influence such as electric current,HRT,C/N were examined,and feasible condition was confined.Comparative tests confirmed that the use of immobilized cell technology could promote denitrification effectively.The results obtained in this study suggested that the current density was 30mA and the flux of influent was 9mL/min,COD and nitrate removal efficiency was 50% and 82.03%,respectively.The load of denitrification of the reactor was 0.297 mg(NO3——N)/(cm2/d).Under the same operating conditions,the removal efficiency was 20% increased than ordinary reactor by the use of immobilized cell technology.