Utilising the latest innovations in hydraulic grit capture technology for increased efficiencies and decreasing economic investment

Chuck Miller & Andy Hornabrook, Smith & Loveless: PRESENTATION ONLY


• 21st century vortex technology available today can remove 95% of 105 micron grit and larger, ensuring that the sewage treatment works’ downstream processes are protected from grit accumulation. This is well in excess of the efficiency of existing grit systems being currently designed and installed in Europe. This can all be accomplished in a footprint that is up to 10 times smaller than current systems, reducing construction costs significantly. A high percentage in energy savings can also be enjoyed, up to 85% dependent on the technology.

• Today’s grit systems must be able to handle wide variations in flow due to future capacity design, extreme rainfall events, leaky sewers, etc. This presentation will highlight the benefits of the latest velocity control baffle system which is integral to the grit removal chamber versus older technologies that can’t handle wide variations in flow without a loss of removal efficiency. There have been major advancements in grit removal efficiency testing that will be shared along with how grit moves in the flumes. We have tested at over 150 installations and will share our experience and knowledge on the subject.

• The presentation will also address the latest innovations in grit handling technology: pumping, transporting, de-watering and washing of grit. This allows reuse of the captured grit, reduces odours, lowers energy costs, lowers operation and maintenance costs and reduces construction cost.

Effective Inlet Works – An Essential Requirement for an Efficient Treatment Plant Introduction 

Inlet works performance is a key factor in the overall performance of a wastewater treatment plant. Failures upstream causes problems in the waterline due to: FOG accumulation in stagnant areas with associated odour problems; ragging of sensors; carry through of compounds that exacerbate bulking and foaming, and hinder settlement. It also causes problems in the sludge line due to FOG depositions in the pipework, grit accumulation in the digester reducing the available volume, and digester foaming due to carry through of FOG and surfactants. The changes in flow and load patterns witnessed over the last decade as a result of climate change often mean that existing inlet works are inappropriately designed and sized. In addition inlet works are often a neglected asset, infrequently maintained with routine failures.

This event considered:

• Examining the case for appropriate and well-maintained inlet works.
• Recent advances in technologies for screens and grit removal.
• Considering appropriate sizings for today’s inlet flow variation
• Exploring new opportunities to recover and reuse the resources that are available in screenings and grit.

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