城市污水曝气过滤式化学除磷试验研究

磷污染与水体富营养化密切相关，研究开发经济、有效的除磷方法是解决当前水体富营养化问题的迫切需要。为此开展了曝气过滤式化学除磷的试验研究，考察了富铁填料层厚度、滤速、气量等对除磷效果的影响。结果表明，曝气过程和曝气量对除磷效果有重要影响，通过适量曝气既可以提高除磷率，又可以控制出水铁含量；当滤速≤3m／h时，滤层厚度〉0．4m便可使出水总磷达到排放标准；气水联合冲洗是对多孔富铁填料进行再生的有效方法。

Phosphorus Removal by Chemical Precipitation with Aeration Filtration from Municipal Sewage

Phosphorus pollution has been linked with eutrophication and its associated problems. The need for an efficient and cost-effective phosphorus removal process has now become apparent. Therefore, an experiment using aeration filtration to remove phosphorus was carried out. To adjust the media depth, filtering velocity and air amount, the relationship between influencing factors and phosphorus removal efficiency was studied using effluent of a biological aerated filter as influent of the pilot-filter column. The results show that aeration and air amount have important effects on phosphorus removal. The effluent TP meets the sewage discharge standard when the filtering velocity is under 3 m/b and the filter media depth above 0.4 m. The air-water backwash is an efficient regeneration method for porous iron-rich media.