We present a second-generation wastewater treatment inventory model, WW LCI 2.0, which on many fronts represents considerable advances compared to its previous version WW LCI 1.0. WW LCI 2.0 is a novel and complete wastewater inventory model integrating WW LCI 1.0, i.e. a complete life cycle inventory, including infrastructure requirement, energy consumption and auxiliary materials applied for the treatment of wastewater and disposal of sludge and SewageLCI, i.e. fate modelling of chemicals released to the sewer. The model is expanded to account for different wastewater treatment levels, i.e. primary, secondary and tertiary treatment, independent treatment by septic tanks and also direct discharge to natural waters. Sludge disposal by means of composting is added as a new option. The model also includes a database containing statistics on wastewater treatment levels and sludge disposal patterns in 56 countries. The application of the new model is demonstrated using five chemicals assumed discharged to wastewater systems in four different countries. WW LCI 2.0 model results shows that chemicals such as diethylenetriamine penta (methylene phosphonic acid) (DTPMP) and Diclofenac, exhibit lower climate change (CC) and freshwater ecotoxicity (FET) burdens upon wastewater treatment compared to direct discharge in all country scenarios. Results for Ibuprofen and Acetaminophen (more readily degradable) show that the CC burden depends on the country-specific levels of wastewater treatment. Higher treatment levels lead to lower CC and FET burden compared to direct discharge. WW LCI 2.0 makes it possible to generate complete detailed life cycle inventories and fate analyses for chemicals released to wastewater systems. Our test of the WW LCI 2.0 model with five chemicals illustrates how the model can provide substantially different outcomes, compared to conventional wastewater inventory models, making the inventory dependent upon the atomic composition of the molecules undergoing treatment as well as the country specific wastewater treatment levels.

我们提出了第二代废水处理清单模型WW LCI 2.0，与先前版本的WW LCI 1.0相比，它在许多方面都具有可观的进步。WW LCI 2.0是结合WW LCI 1.0的新颖而完整的废水清单模型，即完整的生命周期清单，包括基础设施要求，能耗和用于废水处理以及污泥和SewageLCI处置的辅助材料，即化学品的最终建模放到下水道。该模型被扩展以考虑到不同的废水处理水平，即一级，二级和三级处理，化粪池的独立处理以及直接排放到天然水中。通过堆肥处理污泥作为新的选择。该模型还包括一个数据库，其中包含有关56个国家的废水处理水平和污泥处置方式的统计数据。通过假定在四个不同国家的废水系统中排放的五种化学品证明了新模型的应用。WW LCI 2.0模型结果表明，与在所有国家/地区情景中直接排放相比，二乙烯三胺五（亚甲基膦酸）（DTPMP）和双氯芬酸等化学品在废水处理方面表现出较低的气候变化（CC）和淡水生态毒性（FET）负担。布洛芬和对乙酰氨基酚（更易于降解）的结果表明，CC负荷取决于国家/地区特定的废水处理水平。与直接放电相比，更高的处理水平可降低CC和FET负担。WW LCI 2。0使生成完整的详细生命周期清单和对排放到废水系统的化学物质的命运分析成为可能。我们使用五种化学物质对WW LCI 2.0模型进行的测试表明，与传统的废水清单模型相比，该模型如何能够提供截然不同的结果，从而使清单取决于接受处理的分子的原子组成以及特定于国家/地区的废水处理水平。