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| 载体对菌藻共生系统净化农田排水效果的影响 |
| Effect of carrier on the purification of farmland drainage by bacteria-algal symbiosis system |
| 投稿时间：2021-09-22 |
| DOI：10.13254/j.jare.2021.0642 |
| 中文关键词: 菌藻共生系统，农田排水，纤维绳，填充密度 |
| 英文关键词: bacteria and algae symbiotic system, farmland drainage, fiber rope, filling density |
| 基金项目:国家重点研发计划项目 （2016YFD0800500） |
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| 中文摘要: |
| 采用软性纤维生物绳（聚烯烃聚酰胺复合材料）、苦草（Vallisneria natans（Lour.）Hara）、细叶莎草（Cyperus rotundus L.）3种载体，分别构建了载体型菌藻共生系统，研究其净化低碳高氮农田排水的效果。结果表明，以纤维绳为载体，填充密度在10%~30%范围时，系统内藻类浓度随填充密度的增加而提高，对总氮（TN）、总磷（TP）、氨氮（NH4+-N）的去除效果提升明显。其中，30%纤维绳系统效果最好，在水力停留时间（HRT） 2 d，平均气温25℃，进水化学需氧量（COD）、TN、TP、NH4+-N平均浓度分别为73.69、15.45、0.73、6.32 mg·L-1的条件下，出水平均浓度分别为19.17、1.76、0.14、1.48 mg·L-1，达到了《地表水环境质量标准》的Ⅴ类水质标准。细叶莎草系统对COD的处理效果较好，去除率可达77%，苦草系统对各污染物的去除效果一般。此外，系统中叶绿素浓度与出水NH+4-N含量呈显著的负相关关系，载体的引入会使系统内世代周期长的硝化细菌增殖。研究表明，采用纤维绳为载体，填充密度30%时，最有利于提升菌藻共生系统处理农田排水的效果。 |
| 英文摘要: |
| To investigate the treatment effect of a bacteria-algal symbiosis system on farmland drainage with low carbon,and high nitrogen soft fiber bio-rope（polyolefin polyamide composite） , Vallisneria natans（Lour.）Hara and Cyperus rotundus L. were used to construct a symbiotic carrier system for the bacteria and algae. The results showed that when the fiber rope was used as the carrier and the filling density was in the range of 10%~30%, the concentration of algae in the system increased with the increase in density, and the removal effect of total nitrogen（TN） , total phosphorus（TP） , and ammonia nitrogen（NH4+-N）was significantly improved, with the 30% fiber rope system exhibiting the best effect. When the hydraulic retention time（HRT）was 2 d, the average temperature was 25 ℃ , the average concentrations of influent chemical oxygen demand（COD） , TN, TP, and NH4+- N were 73.69, 15.45, 0.73 mg · L-1 and 6.32 mg · L-1, respectively. The average effluent mass concentrations were 19.17, 1.76, 0.14 mg·L-1, and 1.48 mg·L-1, respectively, which reached the class Ⅴ standard stipulated by the surface water environmental quality standard. The C. rotundus L. system showed a good treatment effect on COD, with a removal rate of up to 77%. The removal effect of these pollutants by the V. natans（Lour.）Hara system was mediocre. In addition, a significant negative correlation was found between the chlorophyll concentration and NH4+--N content in the effluent water. The introduction of carriers, such as nitrifying bacteria, would proliferate bacteria with long generation cycles in the system. The results indicated that when 30% fiber rope was used as the carrier, the effect of the bacteria-algal symbiosis system on farmland drainage was optimally improved. |
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