硫碳比对芦苇碳源-硫耦合表面流湿地脱氮的影响

发布时间：2018-10-16 16:39

【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.
[Abstract]:Aiming at the problems of high ratio of NO3--N and low ratio of carbon to nitrogen in returning water of farmland, the authors put forward the PS-SFW (Phragmites australis and sulfur combined surface flow constructed wetland, Reed surface flow constructed wetland with carbon source-sulfur coupling), and studied the feasibility of strengthening the denitrification of farmland water for denitrification. Compared with SFW0 (conventional surface flow wetland without Reed carbon source-sulfur filling), the effect of S / C (mass ratio, 0.32 ~ 0.56) on the denitrification efficiency of PS-SFW was studied under the condition of HRT (hydraulic retention time) of 3? 缁撴灉琛ㄦ槑,HRT涓，

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