State-of-the-Art Modeling Technology of Hydrosims
During the previous decade, an effort to improve design and operational practices has been implemented by Hydrosims to develop and apply a CFD-based process/clarifier model in more than 40 projects for process/clarifier retrofit, troubleshooting and design evaluations worldwide that includes the United States, United Kingdom, Canada, Australia, Japan, Singapore, Thailand, Israel, New Zealand, South Africa, Hong Kong and China.
The many successful modeling projects jointly with the field data before and after the recommended clarifier/process retrofit not only illustrates a state-of-the-art technology for process design optimization but also introduces several innovative clarifier retrofit alternatives, which could be directly used by design engineers to substantially enhance the performance of clarifiers while obtaining the best cost-effectiveness.
For example, an innovative Multilayer Energy Dissipating Inlet Column (MEDIC) was developed by Hydrosims at the Western WWTP in Melbourne, Australia. The new Energy Dissipating Inlet was verified by both model predictions and field observations as a very effective solution to the problem of strong centre influent jets that often occurred in a centre feed clarifier. The significantly reduced clarifier influent intensity and turbulence due to the MEDIC substantially delays the occurrence of dispersed sludge blanket, which is the most direct reason for clarifier operation failure.
Hydrosims has been a forefront leader in water and environmental modeling since the initiation of the associated technology development and application fields. The CFD-based Mass Fully Conservative Clarifier Model (MFCCM) developed by Hydrosims in the early 90s overcomes mass non-conservation, while maintaining the density impact.
| | | Technical Value to the Profession
The state-of-the-art technology and the innovative design alternatives can help the professional team to achieve following goals with the most economic value:
- The previous projects with prototype data before and after
minor clarifier retrofit indicate that an optimized clarifier may provide more than 30% higher capacity. The effective control of turbulence within clarifiers is able to lower the final effluent suspended solids (SS) more than 100% during the plant peak flow period.
- The better clarifier effluent quality not only directly improves
the final effluent quality but also reduces the solids loading conditions for UV disinfection tanks or trickling filters in a process with downstream polishing devices and as a result, reduces the size and construction cost.
- A higher clarifier capacity not only provides higher clarifier
capacity (or better effluent quality) but also allows higher process capacity by using a longer sludge retention time (SRT)
- The higher clarifier and process capacity provides either
more treatment flow (less bypass flow) or more stable process operations, which may not be obtained in a process approaching its capacity limit, especially during winter.
| | Meeting and Exceeding Client’s Needs
In each of our projects the new technology always makes our work to exceed client’s expectations. The field data before and after the process retrofit illustrates our team ability to consistently provide clients solutions that are feasible and cost- effective.
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