硫碳比对芦苇碳源-硫耦合表面流湿地脱氮的影响  被引量:2

Influence of Sulfur-to-Carbon Ratio on Nitrogen Removal by Phragmites australis and Sulfur Combined Surface Flow Construction Wetland

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作  者:常洋[1,2] 王海燕[1,2] 储昭升[1,3] 杭前宇 李莉[1,2] 侯泽英 

机构地区:[1]中国环境科学研究院,环境基准与风险评估国家重点实验室,北京100012 [2]中国环境科学研究院水污染控制技术研究中心,北京100012 [3]中国环境科学研究院,国家环境保护湖泊污染控制重点实验室,湖泊水污染治理与生态修复技术国家工程实验室,北京100012

出  处:《环境科学研究》2017年第11期1783-1792,共10页Research of Environmental Sciences

基  金:国家水体污染控制与治理科技重大专项(2012ZX07105-002)

摘  要:针对农田退水中NO3--N占比高、碳氮比低的问题,提出PS-SFW(Phragmites australis and sulfur combined surface flow constructed wetland,芦苇碳源-硫耦合表面流人工湿地),对其强化农田退水脱氮的可行性进行了研究,并与SFW0(无芦苇碳源-硫填充的常规表面流湿地)进行对比,重点研究了HRT(水力停留时间)为3、2、4 d条件下S/C(质量比,分别为0.32、0.56)对PS-SFW脱氮效能的影响.结果表明,HRT为3 d(第29~40天)时,PS-SFW0.32(S/C比为0.32)、PS-SFW0.56(S/C比为0.56)和SFW0的w(NO3--N)分别为55.9%±11.0%、66.0%±10.0%和7.0%±3.0%,w(TN)分别为36.9%±1.0%、40.3%±3.0%和4.5%±2.0%,PS-SFW0.56对TN和NO3--N去除效能高于PS-SFW0.32,远高于SFW0;HRT为4 d时(第41~81天)及HRT为3 d(第130~149天)时,PS-SFW0.32、PS-SFW0.56、SFW0的w(NO3--N)为66.3%±5.0%、90.5%±4.0%、14.4±4.0%和53.4%±3.0%、62.9%±10.0%、48.5%±5.0%,w(TN)为55.5%±5.0%、75.4%±5.0%、14.4%±3.0%和48.8%±2.0%、57.5%±6.0%、44.1%±5.0%,PS-SFW0.56对NO3--N和TN的去除效能均优于PS-SFW0.32,并且优于SFW0.HRT为2 d(第82~129天)时,PS-SFW0.32、PS-SFW0.56、SFW0的w(NO3--N)为47.7%±7.0%、46.6%±6.0%和26.8%±4.0%,w(TN)为37%±6.0%、36.6%±6.0%和24.0%±3.0%,PS-SFW0.32、PS-SFW0.56对氮的去除效能接近,但仍优于SFW0.研究显示,PS-SFW运行条件应优选S/C为0.56、HRT为4 d.A Phragmites australis and Sulfur Combined Surface Flow Constructed Wetland(PS-SFW) were put forward for treatment of high-Nitrate and low COD/TN(C/N) ratio agricultural runoff,and their feasibility for advanced nitrogen removal of agricultural runoff was extensively studied and compared with a conventional surface flow constructed wetland without P. australis pieces and sulfur packing(SFW0). The study focused on the influence of sulfur/carbon ratio(S/C) on PS-SFW nitrogen removal under 2,3 and 4 d hydraulic retention time(HRT). The results showed that under 3 d HRT(29-40 d),w(NO3^--N) removal of PS-SFW0. 32(0. 32 S/C ratio),PS-SFW0. 56(0. 56 S/C ratio) and SFW0 were 55. 9% ± 11. 0%,66% ± 10. 0% and 7. 0% ± 3. 0%,and w(TN) were 36. 9% ± 1. 0%,40. 3% ± 3. 0% and 4. 5% ± 2. 0%,respectively. The NO3^--N and TN removals of PS-SFW0. 56 were higher than those of PSSFW0. 32,and they were both much higher than SFW0. Under 4 d HRT during 41-81 d operation(3 d HRT during 130-149 d operation), w(NO3^--N) of PS-SFW0. 32,PS-SFW0. 56 and SFW0 were 66. 3% ±5. 0%,90. 5% ±4. 0% and 14. 4% ±4. 0%(53. 4%±3. 0%,62. 9%±10. 0% and 48. 5%±5. 0%),and w(TN) were 55. 5%±5. 0%,75. 4%±5. 0% and 4. 4%±3. 0%(48. 8%±2. 0%,57. 5% ± 6. 0% and 44. 1% ± 5. 0%),respectively. Both NO3^--N and TN removal of PS-SFW0. 56 were higher than those of PS-SFW0. 32,and both were much higher than those of SFW0. Under 2 d HRT(82-129 d),w(NO3^--N) of PS-SFW0. 32,PS-SFW0. 56 and SFW0 were 47. 7% ±7. 0%,46. 6% ± 6. 0% and 26. 8% ± 4. 0%,and w(TN) were 37% ± 6. 0%,36. 6% ± 6. 0% and 24. 0% ± 3. 0%,respectively. The nitrogen removal at 0. 56 and 0. 32 S/C were similar and much higher than SFW0. Considering the above results,0. 56 S/C and 4 d HRT were selected as the optimal conditions for PS-SFW operation.

关 键 词:硫碳比 碳硫耦合反硝化 强化脱氮 表流湿地 农田退水 

分 类 号:X703[环境科学与工程—环境工程]

 

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