| Water pollution is very serious, and it is getting more and more attentions in China. Currently, the main polluted water treatment process is based on bio-treatment in China. At this aspect, it keeps almost the same level with developed country. However, this traditional treatment process is a high cost process, and Chinese economy is far below than developed country. Therefore, it is emergently to develop innovative process suitable for China. And this method must provide multi-benefit including high efficiency, low energy, and low operational cost.Constructed wetland system is a new type of ecological wastewater treatment technology. It is a process with low investment, cheap operational fee, low energy and so on. So, constructed wetland will become a prospect of polluted water treatment methods. But the substrate of traditional constructed wetland mainly limited by soil, gravel, zeolite. This makes effluent NH4-N not good enough to meet The National Sewage Discharge Standard and reduces live span of constructed wetland considerably, and inhibits its development. This paper does some study about vermiculite. The experiment integral captive test and dynamic test at static state .The main study: purification capacity of wastewater with vermiculite; NH4-N removal sorption isotherm line and sorption speed. This paper also discusses activation and regeneration of vermiculite, and the influence after activation and regeneration. It confirms basic parameters of vermiculite at laboratory conditions. The main results show: ① Most NH4-N mainly remove by ion exchange, the role of physico-chemical sorption isnegligible. ② With low concentration of NH4-N, namely qe< |
PDF Full Text Request