A Study on the Adavanced Treatment Method of Sewage

我们周围的水环境正在恶化。要解决这一问题，首先，净化废水并重新回到公共水域领域至关重要。虽然现有的处理技术可以很好地去除有机物，但对湖泊富营养化的重要因素氮、磷的去除还不够。为防止水体富营养化，亟需开发新的去除技术。然后，我们开始研究更经济、更易于操作的去除方法。一种是光还原法，另一种是反渗透膜法，用于将海水转化为淡水。前者适用于活性污泥法，后者只需在已建系统中添加膜装置即可适用于已建污水系统。后者的除磷脱氮效果优于前者。但是，集中废水的处理和以往的处理问题仍然没有得到解决。

Water environment around us is getting worse. To solve this problem, first of all, it is of great importance to purify the waste water and to return into public water territory. Although the existing treatment techniques can remove the organic matter perfectly, it is not enough to remove the nitrogen and phosphorus which are important factors of eutrophication of lake. The development of new technique to remove them is desired for the prevention of the eutrophication. Then, we made start on the study of their removal methods which are more economical and easier to operate. One is called phoredox method and the other is reverse osmotic membrane method, which is applied for changing the sea water into fresh water. The former is applicable to activated sludge method, the latter is applicable to the established sewage system by only adding the membrane apparatus to the established system. The latter is better than former in dephosphorus and denitrification. But, the problems of treatment of concentrated waster and previous treatment still remain unsolved.