The main purpose of the recently introduced Bürger–Diehl simulation model for secondary settling tanks was to resolve spatial discretization problems when both hindered settling and the phenomena of compression and dispersion are included. Straightforward time integration unfortunately means long computational times. The next step in the development is to introduce and investigate time-integration methods for more efficient simulations, but where other aspects such as implementation complexity and robustness are equally considered. This is done for batch settling simulations. The key findings are partly a new time-discretization method and partly its comparison with other specially tailored and standard methods. Several advantages and disadvantages for each method are given. One conclusion is that the new linearly implicit method is easier to implement than another one (semi-implicit method), but less efficient based on two types of batch sedimentation tests.
Case study - Fitmar, Mexico
Coming from a long line of professional fisherman, the Fitmar family business made a switch from fishery to aquaculture. Seeing aquaculture as a more future proof way of supplying seafood to the local market, this was a very deliberate choice.In order to establish a professional and economically viable model, Fitmar decided to invest a lot of time and effort in optimized hatchery and nursery techniques, including advanced feeding and health protocols to reduce the risks caused by common pathologies.1,600 m2...
Case Study: 48 Hour Tank Lining Repair
GUEST BLOG: 48-hour tank lining corrosion repair, thanks to SPI’s fast curing Polyshield HT-100F UB In this post, we focus on a tank lining corrosion repair that’s recently been completed by our 2015 Global Distributor of the Year, SPI Performance Coatings Ltd, of Wiltshire UK. This particular project involved a steel feed hopper located at a green energy plant producing biogas from maize in Norfolk. The tank lining of the feed hopper, which had a total surface area of 230m², had suffered both...
Case study - GRO in soil at gasoline UST site
These case studies show the performance using Sitelab’s UVF-3100 analyzer testing gasoline range organic hydrocarbons. This includes benzene, xylene, BTEX and other volatile petroleum compounds in the GRO or VPH C6 to C10 hydrocarbon range. When calibrated using Sitelab`s GRO calibration kit (CAL-025), the UVF analyzer produces test results that correlate well to laboratory regulatory methods using GC instrumation. Both the UVF-3100A and UVF-3100D models are fitted with special optical filters sensitive to...
Case study - EDRO in soil at petroleum tank farm site
Environmental engineers needed quick and accurate screening analysis on a tank farm contaminated with a subsurface plume of fuel oil. Sitelab`s EDRO test was performed to delineate the vertical extent of contamination. A drill rig was used to collect samples from the surface down to twenty feet at different locations throughout the property. They needed to quantify the size of the NAPL plume in order to design a recovery system.A total of nine soil samples were split and sent to a certified laboratory for confirmat...
Case study - EDRO in soil at wharf remediation site
Sitelab Calibration Kit CAL-042 is used for EDRO analysis. The UVF-3100 detects hydrocarbons in the C10-C36 range.A Licensed Site Professional (LSP) used Sitelab to investigate a commercial waterfront property, contaminated with a plume of LNAPL resulting from fuel tanks which once stored heating oil, diesel and gasoline dating back to the 1950s. The site is in Massachusetts, where laboratories are required to test TPH in soil using the Mass DEP’s method for Extractable Petroleum Hydrocarbons (EPH).EPH is...