This video walks you through our CW1400 High Compaction Clarifying Thickener (CW1400HC) system at a limestone quarry in Pennsylvania. This specific system allows the producer to eliminate their settling pond and use a closed-loop process to access 4-5 million tons of reserve deposits.
The application flow rate is 1000 GPM, and in this video, you'll learn how we separate the solids into thick, disposable mud and return clean water for reuse.
0:00 Intro
0:11 Application Details
0:35 Slurry Collection & Pumps
0:55 Clarifier Location & Separation
1:10 Control Room & Automation
2:00 Chemical Systems
3:24 Clarifier Mud Discharge & Clean Water Overflow
4:04 Clarifier Mud Removal System & Dewatering Cells
The system we engineered starts near the pit of the quarry, which is about 1/2 mile and 150 feet down from the clarifier. We installed two rubber-lined slurry pumps in a series that operate together to move the slurry up to the clarifier. The pumps are automated based on the water level in the slurry tank.
Next, the dirty water enters the cone-bottom clarifier, where the solid-liquid separation process occurs. A coagulant and a polymer flocculant are added to the slurry to increase separation and sedimentation through coagulation and flocculation.
All the controls and chemical systems are housed in a climate-controlled container with a single-point electrical hook-up. The AutoFloc dosing system automates chemical dosing based on light absorption in the clarifier center-well to account for flow rate and percent solids changes.
The coagulant and polymer flocculant require clean water to dilute the raw chemical to the desired solution strength. Because city dilution water is unavailable on-site, we use clarified water from the clarifier. We installed a bag filter and a cartridge filter to ensure the chemicals receive quality dilution water.
Our LQ50 liquid chemical system dilutes and doses a coagulant into the slurry tank down in the quarry pit first. The coagulant is dosed in the slurry tank because it likes extra mixing time for efficient coagulation.
The dry polymer flocculant is activated, mixed, aged, and dosed with our M800SS Dry Polymer Make-Down System. The polymer is added near the slurry discharge location to achieve optimal flocculation without shearing or breaking the flocs.
The CW1400HC uses a tri-arm rake and slick-coated interior to compact the solids into thick mud in the clarifier's cone bottom. Our mud removal system is automated to ensure that only thick mud is evacuated.
The mud is discharged to dewatering cells that contain a sump to return decant water to the clarifier. As one cell fills, the other dewaters and dries out the mud. The thick mud dewaters in 4-6 days, and front-loaders move the solids to trucks for disposal.
Drop questions in the comments or contact us directly.
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Phone: 414-365-1200
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