复合型生态浮床净化污水厂尾水的效能研究
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摘要
污水厂尾水具有可生物降解有机物含量低、氮磷含量较高的特点。采用融合了生物、生态两类技术特点的复合型生态浮床净化模拟污水厂尾水,考察其对氮、磷的净化效能。结果表明,当HRT为2 d时,复合型生态浮床系统对NH_4~+-N、TN、TP的平均去除率分别为(86.89±13.18)%、(22.19±6.57)%、(76.10±24.31)%,单位面积去除负荷分别达到了(664.29±100.71)、(638.97±178.97)、(61.71±15.12)mg/(m~2·d);当HRT为3 d时,对NH_4~+-N、TN、TP的平均去除率分别为(98.69±0.81)%、(20.56±2.63)%、(91.80±5.52)%,单位面积去除负荷则有所降低,分别为(473.62±36.72)、(395.61±64.10)、(45.79±5.40)mg/(m~2·d)。
Tail water from wastewater treatment plants is low in biodegradable organic matter and high in nitrogen and phosphorus concentration. An integrated ecological floating-bed which has combined characteristics of bio-technology and eco-technology was utilized in this study to purify synthetic tail water from wastewater treatment plants. The nitrogen and phosphorus removal efficiencies were investigated during the experiment. The results showed that under a hydraulic retention time of 2 d,the average removal rates of NH+4-N,TN and TP by the integrated ecological floating-bed were( 86. 89 ± 13. 18) %,( 22. 19 ± 6. 57) %,and( 76. 10 ± 24. 31) %,respectively; and the average removal loads per area were( 664. 29 ± 100. 71) mg/( m~2·d),( 638. 97 ± 178. 97) mg/( m~2·d) and( 61. 71 ± 15. 12) mg/( m~2·d),respectively. Under a hydraulic retention time of 3 d,the average removal rates of NH+4-N,TN and TP reached( 98. 69 ± 0. 81) %,( 20. 56 ± 2. 63) % and( 91. 80 ± 5. 52) %,respectively; while,removal loads per area decreased to( 473. 62 ± 36. 72) mg/( m~2·d),( 395. 61 ± 64. 10) mg/( m~2·d),and( 45. 79 ± 5. 40) mg/( m~2·d),respectively.
Tail water from wastewater treatment plants is low in biodegradable organic matter and high in nitrogen and phosphorus concentration. An integrated ecological floating-bed which has combined characteristics of bio-technology and eco-technology was utilized in this study to purify synthetic tail water from wastewater treatment plants. The nitrogen and phosphorus removal efficiencies were investigated during the experiment. The results showed that under a hydraulic retention time of 2 d,the average removal rates of NH+4-N,TN and TP by the integrated ecological floating-bed were( 86. 89 ± 13. 18) %,( 22. 19 ± 6. 57) %,and( 76. 10 ± 24. 31) %,respectively; and the average removal loads per area were( 664. 29 ± 100. 71) mg/( m~2·d),( 638. 97 ± 178. 97) mg/( m~2·d) and( 61. 71 ± 15. 12) mg/( m~2·d),respectively. Under a hydraulic retention time of 3 d,the average removal rates of NH+4-N,TN and TP reached( 98. 69 ± 0. 81) %,( 20. 56 ± 2. 63) % and( 91. 80 ± 5. 52) %,respectively; while,removal loads per area decreased to( 473. 62 ± 36. 72) mg/( m~2·d),( 395. 61 ± 64. 10) mg/( m~2·d),and( 45. 79 ± 5. 40) mg/( m~2·d),respectively.
引文
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[12]Ijaz A,Shabir G,Khan Q M,et al.Enhanced remediation of sewage effluent by endophyte-assisted floating treatment wetlands[J].Ecol Eng,2015,84(2):58-66.
[2]White S A,Cousins M M.Floating treatment wetland aided remediation of nitrogen and phosphorus from simulated stormwater runoff[J].Ecol Eng,2013,61(8):207-215.
[3]Zhang Q,Achal V,Xu Y,et al.Aquaculture wastewater quality improvement by water spinach(Ipomoea aquatica Forsskal)floating bed and ecological benefit assessment in ecological agriculture district[J].Aquacult Eng,2014,60(3):48-55.
[4]Cao W,Wang Y,Sun L,et al.Removal of nitrogenous compounds from polluted river water by floating constructed wetlands using rice straw and ceramsite as substrates under low temperature conditions[J].Ecol Eng,2016,88:77-81.
[5]尹振娟,杨扬,卢建,等.生物法-人工湿地组合工艺对小城镇混合污水氮素去除效果研究[J].生态环境学报,2010,19(5):1044-1049.
[6]吴丹,缪爱军,李丽,等.表面流人工湿地不同植物及其组合净化污水处理厂尾水研究[J].水资源保护,2015,31(6):115-121.
[7]卜发平,罗固源,许晓毅,等.美人蕉和菖蒲生态浮床净化微污染源水的比较[J].中国给水排水,2010,26(3):14-17.
[8]卢少勇,金相灿,余刚.人工湿地的磷去除机理[J].生态环境,2006,15(2):391-396.
[9]Ning D,Huang Y,Pan R,et al.Effect of eco-remediation using planted floating bed system on nutrients and heavy metals in urban river water and sediment:A field study in China[J].Sci Total Environ,2014,485/486(1):596-603.
[10]Bezbaruah A N,Zhang T C.p H,Redox,and oxygen microprofiles in rhizosphere of bulrush(Scirpus validus)in a constructed wetland treating municipal wastewater[J].Biotechnol Bioeng,2004,88(1):60-70.
[11]Iamchaturapatr J,Su W Y,Rhee J S.Nutrient removals by 21 aquatic plants for vertical free surface-flow(VFS)constructed wetland[J].Ecol Eng,2007,29(3):287-293.
[12]Ijaz A,Shabir G,Khan Q M,et al.Enhanced remediation of sewage effluent by endophyte-assisted floating treatment wetlands[J].Ecol Eng,2015,84(2):58-66.