Membrane thickening of waterworks sludge

被引:1
作者
Gillighan, A [1 ]
Judd, SJ [1 ]
Eyres, R [1 ]
机构
[1] Earth Tech Engn Ltd, Barnsley S75 3DL, S Yorkshire, England
来源
MEMBRANES IN DRINKING AND INDUSTRIAL WATER PRODUCTION II | 2001年 / 1卷 / 5-6期
关键词
microfiltration; potable water; sludge; thickening; ultrafiltration;
D O I
10.2166/ws.2001.0117
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The efficacy of ultrafiltration (UF) and microfiltration (MF) membranes was assessed for the concentration of actual waterworks sludges using crossflow tubular membranes operated at constant transmembrane pressure. The MF membrane gave higher initial fluxes than the UF membrane but after 10 min of filtration the flux value and its decline tended to be very similar for both membranes operating under the same conditions. All membranes gave permeate product water of <0.2 NTU and <100ppb coagulant at all times. For both membranes mechanical cleaning, with sponge balls, was at least as effective as acid chemical cleaning, indicating that no significant permanent internal fouling occurred for these membrane materials. Hydraulic resistance data indicated a significant difference in the dynamic layer resistance between the two membranes. Whilst the UF membrane had a hydraulic resistance 3.7 times that of the MF membrane, the dynamic layer formed on the UF membrane during operation displayed a maximum hydraulic resistance almost nine times lower than that of the MF membrane operating under the same conditions. Correlation of cake resistance R versus feed solids concentration C for all the data generated for t>0 demonstrated reasonable agreement with the expression Rproportional toc(a) where a=0.37 in the current study. This trend has been recorded in previous reported studies, a varying between 0.33 and 0.62 depending on sludge dewaterability.
引用
收藏
页码:215 / 220
页数:6
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