Conte G, Martinuzzi N, Giovannelli L, Pucci B, Masi F
IRIDRA S.r.l., Florence, Italy.
Water Sci Technol. 2001;44(11-12):339-43.
The performance of 4 constructed wetlands designed by IRIDRA Srl and operating in Tuscany (central Italy) has been monitored during the last three years. The 4 treatment systems have different sizes and characteristics: one single stage secondary treatment (150 p.e.); two secondary treatment plants with effluent reuse: one small (60 p.e) and the other big (350 p.e.); a tertiary treatment of effluents from an activated sludge plant with high hydraulic load fluctuation (5-500 p.e.). Due to geographical and economic constraints the four systems have high hydraulic and organic loading rates, neverthless the systems show very good removal performance of COD (62-95%), especially the ones with higher inflow COD concentrations (87-95%). Interesting results concerning also removal percentage of MBAS (42-88%) and ammonium (42-85%) were obtained, even though NH4+ concentration in the outflows of some of the plants, doesn't always comply with Italian quality standards.
过去三年来，一直在监测由IRIDRA Srl公司设计并在意大利中部托斯卡纳运行的4个人工湿地的性能。这4个处理系统具有不同的规模和特点：一个单级二级处理系统（150人口当量）；两个带有出水回用的二级处理厂，一个小型的（60人口当量），另一个大型的（350人口当量）；一个对活性污泥厂排放的废水进行三级处理的系统，其水力负荷波动较大（5 - 500人口当量）。由于地理和经济限制，这四个系统具有较高的水力和有机负荷率，尽管如此，这些系统对化学需氧量（COD）的去除性能非常好（62% - 95%），特别是那些进水COD浓度较高的系统（87% - 95%）。即使某些工厂流出物中的铵离子（NH4 +）浓度并不总是符合意大利的质量标准，但在阴离子表面活性剂（MBAS）去除率（42% - 88%）和铵去除率（42% - 85%）方面也取得了有趣的结果。
