However, fluctuation of an interface level between clear and unclear areas of the thickener can effect flow rate adjustment. The purpose of such an override is correction for errors in the mass control signal as well as for changes in flocculant feed rate. This invention can be adapted to operate a system containing multiple solidliquid ...
26/01/2015 · Thickener Operation. The most common solidsliquid (S/L) unit operation is thickening. A wide variety of thickeners are used including conventional, deep well, paste, high rate and clarifiers which is a thickener subclass used for removing solids from turbid or very low % solids waters. Thickeners are mechanically continuous process equipment ...
This thickener adopts flocculation technology. The slurry is directly input into the compression zone of the thickener to form a filter bed in the pool. The fine particles in the slurry input from the bottom that are not flocculated are washed up by the water flow through the filter bed layer.
03/01/2018 · Flocculant dilution systems are being installed at both the preoxidation thickener and the CCD thickeners. Each system will provide a minimum 100:1 dilution to each thickener using its own overflow. A vertical centrifugal pump will deliver preoxidation thickener overflow from its sump back to the flocculant distribution header.
02/03/2021 · produced with the ionic polyacrylamide flocculant. High calcium concentrations did not interfere with the flocculation flotation process. No scaling occurred at the tank surfaces due to high enough flow rates. Since the sludge's dry weight was between and %, no additional thickening was necessary (see Figure 1 for a picture of sludge
We can also determine when flocculant dosing has failed. Setting problems occur within the Thickener when Ore bodies are changed in the process. One of the biggest problems to an efficiently operating Tailings Thickener is the lack of automatically dosing the flocculant.
There are two general flocculant dosing control methodologies: basing it on feed solids mass flow or off feedback from a sensor on the thickener. Mass flow is consistent and reliable, but not sensitive to changes in the feed solids. If a plant runs consistently, this can work very well and operators can make any needed adjustments.
operating principle sludge recirculation settling. Concentrated sludge is recycled at low flow rates via an eccentric rotor pump to prevent floc breakup; as discussed earlier, recirculated sludge multiplies contact surfaces and accelerates floc agglomeration phenomena. Flocculation is optimum in the Densadeg when the floc takes up approximately 10% of the space in the mechanical flocculator.
01/02/1994 · An investigation into the improvement of the flotation thickening of waste activated sludge has been made. ... because the floc serves as a nucleus to the bubble production or through interaction between the bubble and the floc. Bubble size in flotation thickening 467 Liquid (1) ~olg osl osg Solid phase (s) ~////~ Fig. 2. ... The flow rates and ...
An intelligent switching control for the intervals of concentration and flowrate of underflow slurry in a mixed separation thickener, IFAC Proceedings Volumes, Volume 47, 2014, 338345 Search in Google Scholar [4] Chai T, Jia Y, Li H, Wang H. An intelligent switching control 60 for a mixed separation thickener process.
19/07/2018 · Thickener feed dilution is often used for enhanced flocculation and sediment compressibility. This work investigated the effect of feed dilution on thickener performance for copper flotation .
Dissolved Air Flotation Unit. Flow Diagram Description. Conventional Circular DAF Description. Paramount also offers conventional circular DAF systems. In this system, effluent dosed with flocculant/coagulant from flocculation tank is fed into coagulation tube situated at the centre of DAF unit. Coagulation tube is a vertical cylinder ...
The use of automatic control of flocculant addition will greatly improve the performance of the thickener compared with manual control. Manual control necessitates setting the volumetric flow rate of the flocculant to meet the needs of the worst case expected for standard operation of the thickener.
As mentioned, in order to ignore floc impact on Moly flotation, it is a common practice to design coppermoly concentrate thickener without adding floc. Furthermore, the concern that was stated in paper was due to using NaHS in coppermoly which causes acid generation in thickener .
AltaFlo™ Highrate Thickener Overview: The AltaFlo™ ultra highrate thickener is a rakeless thickener that provides mixing, flocculation and internal dilution followed by clarifiion and positive sludge collection and removal in a single tank.
The ETAQ™ draws supernatant from the thickener surface and pumps into the Radflow™ feed stream to achieve the perfect level of feed dilution for optimal flocculation. 0 Velocity [m/s] Cut Plot 2: contours Flow Trajectories 1 Flow Trajectories 2 Injection 1
01/01/2013 · Also the flocculation process is occurred better in this situation. To check the effect of inlet particle size on the thickener performance, an average particle diameter was assumed in the tests. A constant rate of the solid flow and flocculant dosage were considered to investigate the effect of inlet particle size on the thickener efficiency.
08/03/2021 · Flocculation – Flotation Pretreatment Improves Operation of MBR Installed to Treat Snack Food Manufacturing Wastewater *Miroslav Colic1, Jack Hogan1, Ariel Lechter1 1Clean Water Technology Inc. *To whom correspondence should be addressed: mcolic