Reed Bed Refurbishment Waste Disposal (PIN)

Description

Purpose The Coal Authority (CA) operate 166 individual reed beds providing treatment capacity at over 62 mine water treatment sites. The purpose of the mine water treatment sites is to remove iron that has been mobilised from old mine workings into groundwater. These mine water treatment sites operate by enabling oxidation of the iron, which is then precipitated as iron hydroxide (ochre) and settled in settlement ponds. The effluent from the settlement ponds is then passed through reed beds to polish the water before discharge to local water courses under discharge consents. The reed beds are planted with a variety of wetland plants that act primarily as filters to remove any remaining ochre from the water before it is discharged. Over time there is a build-up of ochre within the settlement ponds and biomass from reed growth together with the ochre and any wind-blown dust that is captured within the reed bed. For the reed beds and settlement ponds to operate correctly the available headroom for the water levels have to be maintained within an acceptable range. So an amount of this build up has to be removed periodically and disposed of through an environmentally sustainable route.…

Official publications

• Sharnberry Mine Water Treatment Scheme (MwTS) Design & Build - Phase One
  Published: 30 October 2026
• WAN + Server Switch Replacement & Associated Services
  Published: 9 October 2026
• Snowdown Colliery Site - CCTV
  Published: 12 January 2026
• Photovoltaic Design & Installation Services - Lynemouth & Silverdale Sites
  Published: 2 January 2026
• Westleigh Pumping Borehole
  Published: 26 November 2025
• Shawfair Land Sale Project
  Published: 17 November 2025
• Minsterley White Tip diversion
  Published: 23 September 2025
• Data Gathering and Technical Support
  Published: 22 September 2025
• Cwm Rhediol soil stabilisation trials
  Published: 18 August 2025
• Nent Haggs Dosing Building Extension
  Published: 7 August 2025

Previous and next from The Coal Authority

• Gateshead - Interferomatric Synthetic Aperture Radar (InSAR) Levelling Data — 19 April 2024
• Ground Stabilisation by Drilling and Grouting — 28 March 2024
• Replacement Project Management System — 25 March 2024
• Ground Investigation Framework — 22 March 2024
• Modification to existing contract - Management, Operation and Maintenance of Mine Water Treatment Schemes and Monitoring Sites, Mine Gas… — 21 December 2023
• Supply of Gas Analysers, Maintenance, Service and Spares — 6 November 2023

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