Water Treatment: Pollution Control
The question
To ask the Secretary of State for Environment, Food and Rural Affairs, what steps his Department is taking to improve the regulation of wastewater treatment processes to reduce the levels of (a) pharmaceuticals, (b) microplastics and (c) per- and polyfluoroalkyl substances entering the (i) environment and (ii) food chain.
Answered by Emma Hardy
The Environment Agency works with the water industry on the Chemicals Investigation Programme (CIP). This is funded through the water industry price review and considers chemicals in sewage effluent, including some pharmaceuticals and Per- and polyfluoroalkyl substances (PFAS). The fourth CIP has just started.
Regulation does not currently cover microplastics from treated wastewater. 99% of microplastics are removed by sewage treatment processes. The EA and water industry are commencing six investigations under CIP considering generation of microplastics within wastewater treatment works through attrition of plastic equipment, emerging sewage treatment technologies and path of microplastics from biosolids applied to land to soils and groundwater.
The EA sits on the Pharmaceuticals in the Environment Group. Pharmaceuticals are not required to undergo an environmental impact assessment, but a few have ecotoxicological thresholds that inform an assessment of potential risk. The EA Is currently investigating potential ecological risks of mixtures of pharmaceuticals in the aquatic environment.
CIP4 is looking at PFAS from wastewater treatment works. CIP2 identified domestic sewage as a significant source of PFAS. On-going work includes identifying sources of or Perfluorooctanesulfonic Acid (PFOS), a type of PFAS, in catchments to inform approaches to permitting discharges, and to reduce/eliminate PFOS at source.
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