Existing evidence related to soil retention of phosphorus from on-site wastewater treatment systems in boreal and temperate climate zones: a systematic map

作者：Ida Envall, Fritjof Fagerlund, Lena Johansson Westholm, Arvid Bring, Magnus Land, Charlotte Åberg, Neal Haddaway, Jon Petter Gustafsson · 发表于：Environmental Evidence · 年份：2023 · DOI：10.1186/s13750-023-00300-7 · 被引用次数：8 · 研究领域：Soil and Water Nutrient Dynamics、Phosphorus and nutrient management、Constructed Wetlands for Wastewater Treatment

BACKGROUND: In Sweden there are nearly one million soil-based on-site wastewater treatment systems (OWTSs). OWTSs may contribute to eutrophication of surface waters, due to the discharge of phosphorus (P). Hence, in certain cases, a high P removal rate (up to 90%) of OWTSs is required by Swedish authorities. Since these requirements may have costly consequences to property owners, it is debated whether they are too strict. In this debate, it is often claimed that the soil retention of P occurring in the natural environments may be underestimated by authorities. Soil retention is the inhibition of the transport of P through the ground, due to different chemical, physical and biological processes occurring there. These processes make the P transport slower, which may reduce the unwanted impact on receiving water bodies. However, the efficiency of soil retention of P remains unclear. The objective of this systematic map was to collect, code, organise and elucidate the relevant evidence related to the topic, to be able to guide stakeholders through the evidence base, and to support future research synthesising, commissioning, and funding. The systematic map was carried out in response to needs declared by the Swedish Agency for Marine and Water Management but the conclusions should be valid for a wider range of countries across boreo-temperate regions. METHODS: Searches were made for peer-reviewed and grey literature using bibliographic databases, search engines, specialist websi...