ABSTRACT

The study evaluates the wastewater treatment plant reconstruction via the Grey Water Footprint methodology. The application was tested on a medium-size wastewater treatment plant discharging water into a small watercourse. The 6-year monitoring was assessed. The assessment included a period before and after the reconstruction when a capacity was increased and the treatment technology had been equipped with a membrane sludge separation. Ammonium nitrogen is causing the Grey Water Footprint the most often; both, before and after the reconstruction. The assessment has shown that the current setting of legal discharge limits may not cover all environmental risks even if the wastewater treatment plant meets all requirements. For environmental sustainability, it is necessary if the recipient watercourse was at least 1.4 times more watery for assimilation of total nitrogen pollution, and 3.9 times more watery for assimilation of total phosphorus pollution.

摘要

该研究通过灰水足迹方法评估废水处理厂的重建。该应用程序在一个中型污水处理厂进行了测试，该污水处理厂将水排放到一个小型水道中。对 6 年的监测进行了评估。评估包括改造前后的一段时期，当时产能增加，处理技术配备了膜污泥分离。氨氮最常导致灰水足迹；无论是在重建之前还是之后。评估表明，即使污水处理厂满足所有要求，当前设定的法定排放限值也可能无法涵盖所有​​环境风险。为了环境的可持续性，接收水道至少有 1 个是必要的。