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Using on-line turbidimeter monitoring technique in evaluating algal suspension removal

100%

Cheng W. P. , Chi F. H. , Yu R. F. , Kao Y. P.

Environment Protection Engineering

2010

tom Vol. 36, nr 4

65-75

In this study, an on-line Nephelopmetric turbidimeter connecting to a data acquisition unit was used to monitor the algal flocs formation at various velocity gradient (or mixing energy, G in s -1 ) values. The results indicated that the standard deviations (SD) of the turbidities during the flocculation (slow mixing) period provide more information than the floc size. In addition, this on-line monitoring technique can be a simple and effective indicator to obtain an optimal G value for a flocculation process.

Use of nanofiltration membranes to concentrate and recover leached aluminum from acidified water treatment sludge

88%

Cheng W. P. , Chen P. H. , Tian D. R. , Yu R. F. , Fu C. H.

tom Vol. 42, nr 3

19--32

The recovery of aluminum from water purification sludge is usually performed by making the solution acidic or basic. However, for economic reasons and reasons of safety, excessive doses of acid or base should not be utilized. Accordingly, the aluminum concentration in the leached solution is typically limited, thus the recovered aluminum cannot be directly reused as a coagulant. A nanofiltration (NF) membrane can be used in the acidic solution to concentrate high-valence metal ions. There-fore, in this work, H2SO4 was utilized to leach Al3+ ions from water purification sludge. Then, the Al3+ ion solution was concentrated using a low-price NF membrane. The effect of natural organic matter on the Al3+ ion concentrating efficiency in the filtration process has been elucidated. Experimental results reveal that Al3+ ions were effectively prevented from passing through the NF membrane, enabling a highly concentrated aluminum solution to be obtained. However, the presence of organic compounds may reduce the efficiency of the concentration of Al3+ ions in the solution.