组合湿地强化处理养殖废水关键技术研究

组合湿地强化处理养殖废水关键技术研究(任务书,开题报告,论文14000字)
摘要
本研究采用底部曝气式垂直流湿地+折流式水平流湿地的组合模式，对垂直流湿地加强曝气以及通过分流比（加入原污水与经过垂直曝气处理的污水混合）的方式来加强养殖废水处理。在曝气垂直流湿地，TN的去除率达到73.32%，NH4+-N的去除率在80%以上，对P的去除基本在50%左右，对COD的去除达到85%以上。水平流阶段P的百分去除率在55％~70%之间，相对于曝气垂直流湿地来说有所提高。整个系统的去除率：NH4+-N、TN在60%以上，TP、IP的百分去除率在70%以上，COD的百分去除率在88%左右。经过湿地处理的TN、COD浓度达到城镇污水排放一级A标准，P的含量在1~3mg/L之间，达到二级标准，出水的各物质浓度比较低，净化效能比较好。通过本实验得出曝气和分流对整体的净化效能有一定的正效应。装置对COD、TN的去除效果比较好，但对磷的去除不够稳定，还需改进。
关键词：组合湿地；曝气强化；净化效能；分流比；排序分析

Abstract
In this study, a novle combination of bottom-aerated vertical-flow constructed wetland (CW) followed by baffled horizontal flow CW was constructed for theenhancedtreatment of synthetic aquaculture wastewater. The enhancement was completed with the regulation of artificial aeration and split ratio, which was the volume ratio of vertical-flow CW effluent versus raw synthetic wastewater added into the next horizontal flow CW. In the aerated vertical-flow CW, total nitrogen (TN) removal rate reached 73.32%, NH4+-N removal rate was above 80%, phosphorus (P) removal rate was about 50%, and CODMnremoval rate was above 85%. Likely, the percent removal rate of P in the horizontal flow CW was between 55%~70%, which was obviously improved. For the overall removal rate: NH4+-N and TN were higher than 60%, total P (TP) and inorganic P (IP) were higher than 70%, and the percent removal rate of CODMn was about 88%. The concentrations of TN and CODMn in the final effluent could reach the first grade A standard of urban sewage discharge; P content was in the range of 1~3mg/L, which was between the two standards. Generally, the lower concentration of each pollutant in the effluent was, the higher purification efficiency was obtained. Through the overall analysis, it was found that artificial aeration and suitable split ratio displayed a positive effect on treatment performance. The hybrid system displayed ideal removal efficiency on CODMn and TN, but an unstable removal rate was observed on P. Hence, improvement of the hybrid system was needed in further research.
Key words:hybrid wetland; aeration enhancement; purification efficiency; split ratio; redundancy analysis
目  录
第一章  绪论    1
1.1研究背景    1
1.2 国内外研究现状及发展动态分析    1
1.2.1 人工湿地的净化途径    1
1.2.2 人工湿地应用于水产养殖中存在的问题    3
1.3 本研究的目的意义    4
第二章 材料与方法    6
2.1 实验装置    6
2.2 实验方法    6
2.3 进水水质    7
2.4 污水净化效率的计算方法    7
2.5数据处理    8
第三章 结果与分析    9
3.1曝气垂直流湿地净化效果及影响因素分析    9
3.1.1进、出水理化特征比较    9
3.1.2 湿地的净化效能分析    10
3.1.3 垂直流湿地净化效能排序分析    11
3.1.4讨论与结果    14
3.2折流式水平流湿地净化效果及影响因素分析    15
3.2.1进、出水理化特征比较    15
3.2.2湿地的净化效能分析    16
3.2.3水平流湿地净化效能排序分析    18
3.2.4讨论与结果    20
3.3组合式地系统净化效果及分析    21
3.3.1数据分析    21
3.3.2结果与讨论    22
第四章 结论    23
参考文献    24
致  谢    26