| 缓释碳源滤料滤池用于二级出水的深度脱氮 |
| 摘要点击 2335 全文点击 1377 投稿时间：2012-12-06 修订日期：2013-02-26 |
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| 中文关键词 缓释碳源 反硝化滤池 深度脱氮 聚己内酯 有机物残留 |
| 英文关键词 sustained-release carbon source denitrification biofilter advanced nitrogen removal polycaprolactone (PCL) organic residue |
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| 中文摘要 |
| 以聚己内酯(PCL)为反硝化电子供体和生物载体,开发出具有脱氮和过滤功能的缓释碳源滤料滤池,并以城市污水处理厂二级出水为原水进行深度脱氮试验,结果表明,在20.1~22.0℃ 的条件下,进水总氮(TN)质量浓度30.0 mg ·L-1,HRT为0.5 h,反硝化负荷达54.0 mg ·(L ·h)-1时,TN的去除率最高可达98.9%; 出水总有机碳(TOC)为6.5~8.4 mg ·L-1,比进水增加了2.0~3.0 mg ·L-1; 出水SS低于4.0 mg ·L-1; 反硝化过程所需有机碳主要是在微生物作用下缓慢释放,其占到有机碳总释放量的84.2%; 对碳源滤料进行扫描电镜观察,发现在其表面形成了致密的生物膜,其中微生物以杆菌和丝状菌为主. |
| 英文摘要 |
| An innovative denitrification biofilter was developed with polycaprolactone (PCL) as the carbon source and biofilm carrier. The performance of nitrogen removal was investigated with biologically treated effluent from secondary clarifier, and the results indicated that a maximum TN removal efficiency of 98.9% was achieved under the following conditions: influent total nitrogen (TN) concentration 30.0 mg ·L-1, denitrification load 54.0 mg ·(L ·h)-1, operating temperature 20.1-22.0℃, hydraulic retention time 0.5 h; the total organic carbon (TOC) in effluent was 6.5-8.4 mg ·L-1, which was increased by 2.0-3.0 mg ·L-1 compared with that in the influent; the suspended solids (SS) concentration was less than 4.0 mg ·L-1 during operation; nearly 84.2% of the total released organic carbon which was used as electron donor in the denitrification process, was derived in the presence of microbes. The surface of the PCL pellets was observed by scanning electron microscope (SEM), it was shown that thick biofilm was formed on the surface of pellets, and the main microbial species were bacillus and trichobacteria. |
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