Ultrashort Hydraulic Retention Time of Aeration and Nonaeration Constructed Wetlands for a Large Volume of Primary-Treated Wastewater from a Medical Rubber Glove Factory

Worasit P. Na-Ayuthaya, Krirk Wongsontam
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Abstract

A substantial volume of primary-treated wastewater from a medical rubber glove factory caused public freshwater to become sewage. The ultrashort hydraulic retention time in constructed wetlands was urgently employed for wastewater remediation. Pilot-scale, aeration, and nonaeration horizontal surface flow constructed wetlands (HSFCWs) with emergent plants were designed, compared, and optimized. Activated carbon, coconut shells, and oyster shells were subsequently transferred into a plastic basket as a substrate layer, while Typha angustifolia L. was used as an emergent plant. The experiments were conducted at a hydraulic retention time of 2, 4, 6, and 8 hr. per effluent recirculation. Sampling data were collected for each of the four effluent recirculations. The removal efficiencies of BOD, COD, FOG, TKN, TSS, TDS, EC, and salinity in the aeration HSFCWs were high—53.25, 67.28, 97.93, 78.93, 95.87, 87.52, 86.36, and 90.38%—at the first effluent recirculation of sampling, respectively, while the removal efficiencies in the nonaeration HSFCWs were also high—55.12, 57.38, 94.62, 83.10, 95.95, 88.09, 89.54, and 93.46%, respectively. Increasing the hydraulic retention time increased removal efficiencies. The removal efficiency of BOD in aerated HSFCWs was higher than in nonaerated HSFCWs in the second effluent recirculation of sampling. This is because the oxygen supplied by aeration in the system increased the organic and inorganic pollutant removal efficiencies. Other pollutants were removed more effectively during the second effluent recirculation. Excluding BOD and COD, Duncan’s multiple test revealed that the number of effluent recirculations for removal efficiencies of FOG, TKN, TSS, TDS, EC, and salinity was nonsignificant at the p≤0.001 level. These findings led to optimization of the medical rubber glove wastewater treatment at an ultrashort hydraulic retention time of 2–4 hr. This process and the control of CWs may be the best industrial wastewater treatment practice and a long-term solution for the industrial sector.
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曝气与不曝气人工湿地处理医用橡胶手套厂大容量初处理废水的超短水力停留时间
一家医用橡胶手套厂的大量初级处理废水使公共淡水变成污水。人工湿地超短的水力停留时间已成为污水治理的迫切需要。设计、比较和优化了中试规模、曝气和不曝气水平地表流人工湿地(HSFCWs)。随后将活性炭、椰子壳和牡蛎壳转移到塑料篮中作为底物层,而将田螺作为应急植物。实验分别在2、4、6、8小时的水力滞留时间下进行。按废水再循环。收集了四个污水再循环系统的采样数据。曝气HSFCWs对BOD、COD、FOG、TKN、TSS、TDS、EC和盐度的去除率分别为53.25、67.28、97.93、78.93、95.87、87.52、86.36和90.38%,不曝气HSFCWs的去除率也分别为55.12、57.38、94.62、83.10、95.95、88.09、89.54和93.46%。增加水力停留时间可以提高去除效率。在采样二次出水循环中,曝气HSFCWs对BOD的去除率高于未曝气HSFCWs。这是因为系统中曝气提供的氧气增加了有机和无机污染物的去除效率。其他污染物在第二次出水循环中被更有效地去除。排除BOD和COD, Duncan多重检验显示,在p≤0.001的水平上,污水循环次数对FOG、TKN、TSS、TDS、EC和盐度的去除效率无显著影响。这些结果对医用橡胶手套废水在2 ~ 4小时超短水力滞留时间下的处理进行了优化。这一过程和对化粪池的控制可能是工业废水处理的最佳做法和工业部门的长期解决方案。
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期刊介绍: The main aim of the International Journal of Ecology & Development (IJED) is to publish refereed, well-written original research articles, and studies that describe the latest research and developments in ecology and development. It also covers the many potential applications and connections to other areas of Ecological Science, economics and technology such as the use and development of mathematics/statistics in ecology or use and development of economics for ecology & development or inter-disciplinary nature of applications for Ecology & Development. International Journal of Ecology and Development is published three issues in a year in Winter, Summer and Fall.
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