TY - JOUR
T1 - In situ determination of solidosity profiles during activated sludge electrodewatering
AU - Saveyn, H.
AU - Curvers, D.
AU - Pel, L.
AU - Bondt, de, P.
AU - Van der Meeren, P.
PY - 2006
Y1 - 2006
N2 - Two non-invasive techniques were evaluated for the online measurement of sludge solidosity profiles during both pressure and electrodewatering operations. In a first approach, a radioactive tracer adsorbed onto the sludge solids was monitored by a gamma camera. Although this technique appeared very flexible in use, the lack of resoln. highly limited its usefulness for (electro)dewatering expts. Improvement in gamma camera resoln. by the development of new detectors might, however, increase the future applicability of this technique. In a second technique, NMR measurements on a specially designed electrodewatering unit were made. Hereby, reliable online measurements of the solidosity profiles of activated sludge during electrodewatering could be made, with a resoln. of less than 1 mm. Thus, the mechanisms of electroosmotic- and pressure-driven cake dewatering could be illustrated. Given the measurement time required for measuring one sludge profile, both techniques appeared mainly suited for slowly varying processes, such as activated sludge expression, and not for fast changing processes, such as the initial phases of sludge filtration. [on SciFinder (R)]
AB - Two non-invasive techniques were evaluated for the online measurement of sludge solidosity profiles during both pressure and electrodewatering operations. In a first approach, a radioactive tracer adsorbed onto the sludge solids was monitored by a gamma camera. Although this technique appeared very flexible in use, the lack of resoln. highly limited its usefulness for (electro)dewatering expts. Improvement in gamma camera resoln. by the development of new detectors might, however, increase the future applicability of this technique. In a second technique, NMR measurements on a specially designed electrodewatering unit were made. Hereby, reliable online measurements of the solidosity profiles of activated sludge during electrodewatering could be made, with a resoln. of less than 1 mm. Thus, the mechanisms of electroosmotic- and pressure-driven cake dewatering could be illustrated. Given the measurement time required for measuring one sludge profile, both techniques appeared mainly suited for slowly varying processes, such as activated sludge expression, and not for fast changing processes, such as the initial phases of sludge filtration. [on SciFinder (R)]
U2 - 10.1016/j.watres.2006.04.003
DO - 10.1016/j.watres.2006.04.003
M3 - Article
C2 - 16720034
SN - 0043-1354
VL - 40
SP - 2135
EP - 2142
JO - Water Research
JF - Water Research
IS - 11
ER -