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Standard Laboratory Testing
One of the keys to a successful dewatering project is the development of the most effective chemical conditioning program. In this issue, we will focus on the testing typically completed in WaterSolve’s laboratory to determine the most effective chemical product(s) and dose(s) for a dewatering project using Geotube® containers. While every application is different, WaterSolve has developed and refined our proprietary testing methods and reports to provide the information you need to determine if the application is a good fit for Geotube® Dewatering Technology. Once it is determined that the technology is suited for your application, the testing will provide the most effective chemical conditioning program, which will consist of one or more products at prescribed dose(s).
The first step is completion of the “Standard Sample Chain of Custody.” This form allows us to log and track each sample received and provides information on the type of application you are considering. This form is either submitted with the sample or separately prior to the sample arriving at our laboratory.
The solids concentration of the sample is determined based on standard methods. In many cases a volumetric dilution is completed to simulate the removal method or because it is necessary for proper dewatering. In some cases, multiple dilutions are tested to determine the optimal dilution or the range of treatment.
Small samples are then tested using several different products and combination of products. The best performing products or combinations are then further tested for other parameters, such as water release, water clarity, shear sensitivity, filtration capability, etc. This testing is typically completed by conducting Rapid Dewatering Tests (RDTs) or Cone Tests. These tests both involve passing known volumes of conditioned sample through the GT500D fabric with the filtrate release documented over time. The solids captured and the filtrate released are then tested for total solids, total suspended solids or turbidity, and other parameters as appropriate for the specific application. In some cases, an unconditioned sample can be compared with the conditioned sample as well.
From the testing described above, the most effective chemical conditioning program can be recommended. The information is presented in a comprehensive report with data, photographs, tabulation of results, and recommendations.
We cannot emphasize enough the importance of proper testing by an experienced technician. The chemical conditioning is most often an integral part of the Geotube® Dewatering system and is critically important to the overall success of the dewatering application. When the application is pending, we typically complete this testing at no cost. For study phase projects, we charge a fee for this service.
In future issues, we will discuss additional testing that can be completed to estimate certain operational parameters. If you would like to discuss any testing needs, please contact us.