Premier Tech Water & Environment selects Biomarble from the Warden Biomedia range for London Gateway Port project

June 08, 2020

Premier Tech Water & Environment selects Biomarble from the Warden Biomedia range for London Gateway Port project

Premier Tech is a world leading provider of onsite and decentralised wastewater treatment, water storage and rainwater harvesting solutions. A wholly owned subsidiary of Premier Tech, it has a reputation for developing and commercialising high-performance water and wastewater technologies across the domestic, commercial and industrial sectors and is associated with over 100,000 water and wastewater installations worldwide.

Premier Tech was commissioned by international port developer and builder, DP World, to design and build a wastewater treatment plant as part of an expansion project at its London Gateway Port, the state-of-the-art deep seaport and logistics park in Essex. The plant needed to be suitable for 300 population equivalent (PE) to meet the British Water code of Practice.

Premier Tech Water & Environment determined that a SAF300N5 module was the best solution to meet its client's brief and selected Warden Biomedia's Biomarble from its filter media range as part of that solution.

SAF (Submerged Aerated Filter) technology was developed over three decades ago and is based on well-established and robust fixed film technology used for the biological treatment of both municipal wastewater and industrial effluent.

SAF units are typically a three-tank system comprised of a primary settlement tank, the SAF Biozone and a secondary clarifier (humus tank). The SAF Biozone operates as an up-flow system, with internal air distribution and separate water distribution systems. The Biozone achieves high removal efficiencies when combined with recycled polypropylene random Biomedia. There is also a low sludge return recirculation rate because of the Biomedia which helps reduce the operating costs.

The Biomedia provides a large surface area on which bacteria attach themselves to live and grow and improve oxygen mass transfer. Both air and wastewater are introduced into the base of the SAF unit simultaneously which enables a completely mixed system to develop almost instantaneously.

Premier Tech chose Biomarble for its recycled polypropylene random media, as it is ideal for improved performance in new wastewater treatment plants when compared to alternative media options. With a spherical design and surface area of 310m²/m³, Biomarble has the highest surface area of the three spherical designs in the Warden Biomedia filter media range which made it ideal for this project.

The combination of the higher protected surface area and open void ratio, ensures that a high active population of biomass can be maintained at high concentrations, thus maintaining process stability and reduced operational costs. The SAF300N5 module, with the help of Biomarble, can achieve high removal efficiencies compared with conventional SAF units.

Dr Evangelos Petropoulos, the Technical Manager at Premier Tech said, “Our team members were expertly guided by the Warden team on the best filter media for this application and as a result have achieved very positive results from this treatment plant installation. Warden Biomedia is a very valuable partner, helping us meet and exceed our performance targets for the Port.”



Premier Tech's eco-conscious ethos drives team members and their processes to embrace every opportunity to make a difference, whilst remaining committed to the development of innovative and durable packaged water and wastewater solutions.

Premier Tech were proud to service DP World and support the expansion project at the London Gateway Port, combining professional engineering with the Warden Biomedia to provide the most efficient solution.

Results Achieved
  Consent limit Result Achieved
BOD (Biochemical Oxygen Demand) <20 mg/l 2.3 mg/l
Suspended Solids <30 mg/l 18.2 mg/l
Ammonia <5 mg/l 0.058 mg/l


World leader in onsite and decentralized wastewater treatment, water storage and rain water harvesting solutions, Premier Tech Aqua specializes in the design and manufacturing of innovative and durable solutions.

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