New EC standards published in 2009 led to a surge in onsite wastewater treatment systems reaching the European market. Here we summarize their technical aspects and compare them to known values used in centralized wastewater treatment. The paper deals with two types of processes: attached-growth systems (AGS) on fine media and suspended-growth systems (SGS). Covering 141 technical approvals and 36 manufacturers, we compare onsite design criteria against the centralized wastewater design criteria for each process.

The systems use a wide range of materials for bacterial growth, from soil, sand or gravel to zeolite, coconut shavings or rockwool cubes, with a huge range of variation in useful surface, from 0.26 m²/PE for one rockwool cube filter to 5 m²/PE for a (traditional system) vertical sand filter. Some rockwool can handle applied daily surface load of 160 g BOD₅/m².

SGS design parameters range from 0.025 to 0.34 kg BOD₅ per kg MLVSS/d with hydraulic retention times of 0.28–3.7 d. For clarifier design, water velocity ranges from 0.15 to 1.47 m/h. In the sludge line, sludge storage volume ranges from 0.125 down to just 0.56 m³/PE.

2009年发布的新EC标准导致现场废水处理系统激增，进入了欧洲市场。在这里，我们总结了它们的技术方面，并将它们与集中式废水处理中使用的已知值进行了比较。本文涉及两种类型的过程：精细介质上的附着生长系统（AGS）和悬浮生长系统（SGS）。我们涵盖了141个技术批准和36个制造商，将每个流程的现场设计标准与集中式废水设计标准进行了比较。

该系统使用多种材料进行细菌生长，从土壤，沙子或砾石到沸石，椰子屑或石棉块，有用表面的变化范围很大，从一个石棉块过滤器的0.26 m ² / PE到5 m ² / PE（传统系统）立式砂滤器。某些岩棉每天可承受160 g BOD ₅ / m ^2的表面负荷。

SGS的设计参数范围为每千克MLVSS / d 0.025至0.34 kg BOD ₅，水力停留时间为0.28–3.7 d。对于澄清器设计，水速范围为0.15至1.47 m / h。在污泥生产线中，污泥的存储量范围从0.125降至仅为0.56 m ³ / PE。