Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Viscosity
Patent
1989-05-01
1991-04-02
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Viscosity
137 92, G01M 1110
Patent
active
050038141
ABSTRACT:
The invention provides a sampling process and apparatus therefor for the control of the addition of expensive conditioning material, referred to as polymers, to suspensions, sludges and the like, particularly sewage sludge, to facilitate its dewatering. The process employs a viscometer able to measure rapidly the shear stress of the sludge and obtain a typical peak value characteristic of optimum conditioning of the sludge. The process and apparatus also operate in a new mode involving charging a sample vessel with unconditioned sludge, taking a measurement to obtain an "unconditioned" signal, and then filling with conditioned sludge and obtaining a "conditioned" signal, the unconditioned signal indicating the solids content of the sludge and being used to modify the signal controlling the polymer flow and therefore the dosage to compensate for this charge. The viscometer rotor and the vessel interior are rinsed to remove the conditioned sludge before a fresh batch of unconditioned sludge is introduced. The system employs a minimum-seeking algorithm to minimize polymer usage. Changes are made to the polymer flow rate when the conditioned signal change is greater than a dead-band straddling the optimum value, the minimum-seeking also taking place within the dead-band. It is sometimes found that the peak value/polymer flow rate characteristic includes a secondary peak, whereby the peak value reduces with increase of polymer flow, and this potentially unstable condition is detected and corrected.
REFERENCES:
patent: 2354923 (1944-08-01), McNamee
patent: 2938378 (1960-05-01), Canada et al.
patent: 3163172 (1964-12-01), Buzzard
patent: 3292422 (1966-12-01), Banks
patent: 3389596 (1968-06-01), Lion et al.
patent: 3835045 (1974-09-01), Hussissian
patent: 3938890 (1976-02-01), Flavell
patent: 4077252 (1978-03-01), Stutz et al.
patent: 4544489 (1985-10-01), Campbell etal.
patent: 4685328 (1987-08-01), Huebner et al.
Campbell Herbert W.
Crawford Paul M.
Myers Michael J.
Siverns Steven L.
Lenon Envionmental Inc.
Williams Hezron E.
LandOfFree
Sampling processes for use in the controlled addition of conditi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sampling processes for use in the controlled addition of conditi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sampling processes for use in the controlled addition of conditi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-320361