当前位置: X-MOL 学术Water Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Removal of selected emerging PPCP compounds using greater duckweed (Spirodela polyrhiza) based lab-scale free water constructed wetland
Water Research ( IF 12.8 ) Pub Date : 2017-09-14 , DOI: 10.1016/j.watres.2017.09.002
Jianan Li , Qizhi Zhou , Luiza C. Campos

Greater duckweed (Spirodela polyrhiza) based lab-scale free water constructed wetland (CW) was employed for removing four emerging pharmaceuticals and personal care products (PPCPs) compounds (i.e. DEET, paracetamol, caffeine and triclosan). Orthogonal design was used to test the effect of light intensity, aeration, E.coli abundance and plant biomass on the target compounds. Synthetic wastewater contaminated with the target compounds at concentration of 25 μg/L was prepared, and both batch and continuous flow experiments were conducted. Up to 100% removals were achieved for paracetamol (PAR), caffeine (CAF) and tricolsan (TCS) while the highest removal for DEET was 32.2% in batch tests. Based on orthogonal Duncan analysis, high light intensity (240 μmolmm−2s−1), full aeration, high plant biomass (1.00 kg/m2) and high E.coli abundance (1.0 × 106 CFU/100 mL) favoured elimination of the PPCPs. Batch verification test achieved removals of 98.8%, 96.4%, 95.4% and 17.1% for PAR, CAF, TCS and DEET, respectively. Continuous flow tests with CW only and CW followed by stabilization tank (CW-ST) were carried out. Final removals of the PPCP contaminants were 32.6%, 97.7%, 98.0% and 100% for DEET, PAR, CAF and TCS, respectively, by CW system alone, while 43.3%, 97.5%, 98.2% and 100%, respectively, were achieved by CW-ST system. By adding the ST tank, PPCP concentrations decreased significantly faster (p < 0.05) compared with continuous flow CW alone. In addition, after removing aerators during continuous flow CW experiments, the treatment systems presented good stability for the PPCP removals. CW-ST showed better chemical oxygen demand (COD) and total organic carbon (TOC) removals (89.3%, 91.2%, respectively) than CW only (79.4%, 85.2%, respectively). However, poor DEET removal (<50%) and high E.coli abundance (up to 1.7 log increase) in the final treated water indicated further treatment processes may be required. Correlation analysis showed significant correlations (p < 0.05) between PPCPs and water quality parameters (e.g. COD, nitrate, phosphate), and between the four PPCP compounds for the continuous flow CW and CW-ST systems. Positive results encourage the test of Greater duckweed at pilot scale CW using real wastewater.

中文翻译:

使用基于大型浮萍(Spirdelela polyrhiza)的实验室规模的自由水人工湿地去除选定的新兴PPCP化合物

基于大型浮萍(Spirodela polyrhiza)的实验室规模的无水人工湿地(CW)被用于去除四种新兴药品和个人护理产品(PPCP)化合物(即DEET,对乙酰氨基酚,咖啡因和三氯生)。正交设计用于测试光强度,通气量,大肠杆菌丰度和植物生物量对目标化合物的影响。制备了浓度为25μg/ L的被目标化合物污染的合成废水,并进行了分批和连续流动实验。对乙酰氨基酚(PAR),咖啡因(CAF)和三氯生(TCS)的去除率最高达到100%,而批处理测试中DEET的去除率最高,为32.2%。基于正交邓肯分析,高光强度(240μmolmm -2 s-1),充分曝气,高植物生物量(1.00 kg / m 2)和高大肠杆菌含量(1.0×10 6  CFU / 100 mL)有助于消除PPCP。批次验证测试分别去除了PAR,CAF,TCS和DEET的98.8%,96.4%,95.4%和17.1%。仅使用连续水和连续水,然后是稳定水箱(CW-ST)进行了连续流量测试。仅通过连续波系统最终清除DEET,PAR,CAF和TCS的PPCP污染物分别为32.6%,97.7%,98.0%和100%,而分别为43.3%,97.5%,98.2%和100%。通过CW-ST系统实现。通过添加ST储罐,PPCP浓度的下降明显更快(p <0.05)与单独连续流CW相比。另外,在连续流连续波实验中去除曝气器后,处理系统对PPCP去除表现出良好的稳定性。CW-ST的化学需氧量(COD)和总有机碳(TOC)去除量(分别为89.3%,91.2%)比仅CW(分别为79.4%,85.2%)更好。然而,最终处理水中的DEET去除率不佳(<50%)和高的大肠杆菌含量(最多增加1.7 log)表明可能需要进一步的处理过程。相关分析显示出显着的相关性(p PPCP和水质参数(例如,COD,硝酸盐,磷酸盐)之间的差异(<0.05),以及连续流CW和CW-ST系统的四种PPCP化合物之间的差异。积极的结果鼓励使用实际废水以中试规模连续水对大浮萍进行测试。
更新日期:2017-09-14
down
wechat
bug