新型悬浮填料在原位生物脱氮处理中的应用研究

Application of Novel Suspended Carrier to In-situ Enhanced Biological Denitrification Treatment

将一种新型悬浮填料应用于水库原水的原位生物脱氮处理系统中,采用菌液对该填料进行人工加速挂膜,考察了该系统的生物降解过程及脱氮效果。结果表明,在水温为(23±2)℃、溶解氧为3.0～4.0mg/L以及原水CODMn、NH4+-N、NO2--N、NO3--N、TN、TP分别为5.50、0.240、0.008、1.690、2.120、0.060mg/L的条件下,系统对CODMn、硝态氮和总氮均有较好的去除效果,运行28d以后的去除率分别为(21%～27%)、(50%～76%)、(50%～78%);整个运行期间对氨氮的去除率基本在45%～92%之间。由于原水中营养物的浓度较低,微生物的生长需要一个长期的适应过程。新型填料的特殊结构有利于微生物的附着和生长,形成了一个相对稳定的生态系统,从而使生物膜保持良好的活性及净化功能;同时还在系统中形成了好氧、厌氧、兼氧微环境,有利于提高脱氮效率。

A uovel suspended biological calTier was applied to in-situ biological denitrification of reservoir raw water. The biodegradation process and denitrification effect were investigated after the biological carrier was cultured by bacterial liquid. The results show that the removal rates of CODMn, NO3 -N and TN in the biological denitrification system are 21% to 27%, 50% to 76% and 50% to 78% respectively after 28 days, when water temperature is （23 ±2） ℃, dissolved oxygen is 3.0 to 4.0 mg/L, and raw water CODM,, , NH4 - N, NO2- - N, NOr - N, TN and TP are 5.50 mg/L, 0. 240 mg/L, 0. 008 mg/L, 1. 690 nag/L, 2. 120 mg/L and 0. 060 mg/L respectively. The removal rate of NH; - N is between 45 % and 92 %. A long period of adaptation is required for microbial growth due to poor nutrient environment in the raw water. The special structure of the novel carrier favors the attachment and growth of microorganisms to form an ecosystem, ensuring good activ.ity and purification functions of the biofilm. Meanwhile, the denitrification efficiency is improved because of the coexistence of aerobic, anaerobic and facultative microenvironments in the system.