en.Wedoany.com Reported - Severn Trent Water has recently completed infrastructure upgrades at its Crowthorne, Derbyshire wastewater treatment site by introducing a Moving Bed Biofilm Reactor system, reducing levels of ammonia and phosphorus in the final effluent. The site faced tightening discharge permit requirements, needing to lower total phosphorus from 1 mg/L to 0.2 mg/L and ammonia from 5 mg/L to 4 mg/L, while also experiencing a significant increase in wastewater load.

Due to limited site area and available construction space, along with a 33kV overhead power line crossing the site, crane operations required strict control and restrictions. Following a competitive bidding process, Veolia was selected as the framework supplier for the project, responsible for providing a custom wastewater treatment solution that met the requirements and operated within the confined space. Veolia installed, tested, and commissioned two AnoxKaldnes™ Moving Bed Biofilm Reactor systems, designed with a smaller footprint and greater height to fit the site's customized paving slabs.

The Moving Bed Biofilm Reactor system is an aerobic wastewater treatment method that uses active biofilm carriers with a large surface area to grow bacteria under optimal cultivation conditions. Through aeration, the carriers move continuously within the tank, allowing the bacteria to break down organic substances like ammonia and phosphorus in the wastewater. Due to the large surface area of the carriers, the system can treat large volumes of wastewater within a small footprint. As a standalone system, the site no longer requires sludge recirculation, needing only to remove excess biomass through downstream separation technology.

Stephen Hinds, Chief Project Manager at Severn Trent Water, commented: "Working with Veolia on this project has been a fantastic experience. The installed MBBR system is performing excellently, reducing ammonia and phosphorus levels in our final effluent, helping to protect the water quality of the local river. Furthermore, the system will also provide additional treatment capacity to accommodate the further population growth in Crowthorne over the coming decades."

Paul Cooper, Business Development Manager at Veolia, stated: "We have received excellent feedback from the Severn Trent Water team so far, and we look forward to working with them again in the future. We were not only able to design and install a compact alternating flow MBBR for the constrained space but also delivered it six weeks ahead of schedule—this ensured the company achieved results faster."

Veolia will also provide Severn Trent Water operators with a performance support package for the first 12 months of operation, backed by Veolia's wastewater treatment experts.

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