The principal role of a clarifier is to protect your filters. With this in mind, Leopold takes a flange-to-flange approach to designing a Clari-DAF system installation.
Leopold employs a variety of resources in designing a Clari-DAF system plant:
- Jar Testing Treatability Studies
- Pilot plant Treatability Studies
- Leopold Operation Experience
- Reference Plants
Click here for more information on the Leopold® Clari-DAF™ system design and optimization.
Coagulation and flocculation is a complex process. A number of factors affect it: coagulant dosage, pH, turbidity, TOC and DOC, ions in solution, mixing effects, and temperature.
Leopold employs jar testing to simulate the process of coagulation and flocculation and gather data for optimizing the selection and dosages of coagulants for a specific raw water:
- Coagulant selection and dosage
- Coagulant aid selection and dosage
- Determination of optimum pH
- Point of addition of pH adjustment chemicals and coagulant aids
- Optimization of mixing energy
The Leopold Clari-DAF system jar testing unit is a stand-alone system designed to test four samples independently and simultaneously, giving flexibility and variable control.
Leopold Clari-DAF System Jar Testing Report
TopLeopold uses a mobile pilot plant to secure exhaustive, accurate data under actual operating conditions to establish process limits within which Leopold will guarantee performance. In addition, treatability studies conducted with the Leopold Clari-DAF system pilot plant provide filter plant operators with data for obtaining state and environmental regulatory agency approvals.
Designed with Leopold controls, the pilot plant can run unattended. On-line data logging with automatic filtration backwash sequencing and sludge removal allows the pilot plant to gather data and operate around the clock. The Leopold mobile Clari-DAF system pilot plant can log data every 5 minutes. A three-week study can yield 2 million results for statistical control. Flocculation volumes and times can be varied to better target the most appropriate flocculation requirements.
Two in-line static mixers and chemical feed equipment control the water chemistry. One is used for pH adjustment while the other is used for coagulant dosing. Four-stream particle-counting capability allows flexibility for particle analysis of influent, clarified, and effluent water.
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The Leopold mobile Clari-DAF system pilot plant is designed to be installed in one to two days, depending on raw water supply conditions. The unit is supported on hydraulic leveling jacks at four corners, giving stability and accuracy to the unit operation on uneven ground conditions. |
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A small wet lab is built in to the mobile Clari-DAF system pilot plant to allow on-board analysis for iron, manganese, NTU, aluminum, and dissolved oxygen. Medical-grade dosing pumps allow accurate chemical dosing for scale-up factoring. |
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Automatic filters mimic full-scale gravity-fed systems as closely as possible. No pumping between the filter and clarifier means no floc shear and no particle count changes are unnecessarily induced. |
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The filter columns employ Leopold® Universal® Type S® underdrain, Leopold® IMS (Integral Media Support) cap, and media. Media can be Leopold® Engineered Media® anthracite to 1.3 UC, sand, GAC and garnet. The filter columns are independent and have their own NTU meter, particle counter, headloss transmitter, run timer, level gauge, backwash valving. Either water or air/water backwash is available. |
See also:
Leopold Mobile Clari-DAF System Pilot Plant Experience
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