基于NBS的生活污水污染物去除效果研究

NBS与可持续、和谐-绿色发展、资源合理开发和生态保护优先等理念密切相关。在生活污水处理过程中为实现就地取材、成本低、易管理、无二次污染,基于NBS的本地水生植物的合理选取和自然基质的优化组合尤为重要。论文选择5种水生植物(千屈菜、黄菖蒲、芦苇、香蒲、荷花)和6种基质(砂子、石子、炉灰渣、砂子+土、石子+土、炉灰渣+土)进行生活污水的生态处理试验,采用整合分析法研究基质和水生植物对生活污水中的CODMn、TP、TN去除效果,为生活污水的生态处理系统设计提供参考依据。实验结果表明:5种水生植物对CODMn的平均去除率表现为香蒲(85%)芦苇(77%)黄菖蒲(66%)荷花(63%)千屈菜(59%);对TP的平均去除率表现为香蒲(85%)芦苇(76%)黄菖蒲(71%)荷花(69%)千屈菜(61%);对TN平均去除率表现为香蒲芦苇黄菖蒲千屈菜荷花,去除率分别为83%、77%、69%、58%和53%。炉灰渣对生活污水污染物的去除率最高,对CODMn、TN、TP的去除率分别为71%、69%和74%。论文通过评估实验期内同一进水条件下各种组合对污染物的去除能力,确定影响因素,为进行基于NBS的污染物最佳去除效率的研究提供依据。

Pollutants removal effect analysis of domestic wastewater based on nature-based solutions

Nature-Based Solutions (NBS) is closely related to the concepts of sustainable/harmonious-greendevelopment,rational resourcedevelopment,and ecological protection priority. To achieve low cost, easy management and no secondary pollution in the process of treatingdomestic wastewater,the rational selection of local aquatic plants and the optimal combination of natural sediments are particularly important based on NBS. The paper selected 5 kinds of aquatic plants (Lythrum salicarria L., Iris pseeudacoru, Phragmites australis, Typha orientalis, Nelumbo nucifera) and 6 kinds of sediments (Sand, Gravel, Furnace ash,Sand + Soil,Gravel + Soil,Furnace ash + Soil) for ecological treatment experiment ofdomestic wastewater. To study the removal effect of sediments and aquatic plants on CODMn,TP and TN indomestic sewage, the Meta-analysis was used. The results showed that the average removal rate of CODMn by five aquatic plants is as follows:Typha orientalis (85%) > Phragmites australis (77%) > Iris pseeudacoru (66%) > Nelumbo nucifera (63%) > Lythrum salicarria L. (59%);The average removal rate of TP is as follows:Typha orientalis (85%) > Phragmites australis (76%) > Iris pseeudacoru (71%) > Nelumbo nucifera (69%) > Lythrum salicarria L. (61%);The average removal rate of TN is Typha orientalis > Phragmites australis > Iris pseeudacoru > Lythrum salicarria L. > Nelumbo nucifera,the removal rates are 83%,77%,69%,58%, 53%. Furnace ashhas thehighest removal rate ofdomestic wastewater pollutants, and the removal rates of CODMn,TN and TP are 71%,69% and 74%,respectively. The paperdetermined the influence factors by evaluating the removal capacity of various combinations under the same influential conditionsduring the experimental period. The paper has provided a basis for the research on the optimal pollutants''removal efficiency based on NBS.