HELP: floating sludge (coagulation)
HELP: floating sludge (coagulation)
(OP)
i would like to inquire how come the sludge formed after a series of coagulation and floculation in our wastewater system floats and wont settle at the bottom of our hydrocone clarifier. we are currently using polyaluminum chloride and polymer which are injected in our inline mxing system. any explanations and suggestion to address this problem. i'm from a beverage industry. thanks.





RE: HELP: floating sludge (coagulation)
V=g(Ps-Pl)d/U^2
V=settle velocity
Ps=particle density
Pl=liquid density
d=particle dia.
U=liquid velocity
By varying any of the variables in the above form that decreases the settling velcity below a critical point will lead to flotation. There are other operational variables that can affect the settling as well. Such as, temperature, agitation rate, pH, qty. of coagulant/flocculant used, time of addition, type of coagulant and flocculant used.
To go through the entire analysis required to isolate the cause of your flotation problem would require a text on sedmentation and clarification. I hope the above gives you some ideas to check into.
saxon
RE: HELP: floating sludge (coagulation)
RE: HELP: floating sludge (coagulation)
saxon
RE: HELP: floating sludge (coagulation)
RE: HELP: floating sludge (coagulation)
You may want to check this link out... sounds like the problem is similar:
Thread161-92263