The fractal structure and particle size of flocs are generally recognized as the two most crucial physical properties having impact on the efficiency of operation of several unit processes in water and wastewater treatment. In this study, an experimental investigation is undertaken on the effect of aggregate structure in water and wastewater treatment in Hong Kong. The fractal dimension of the resulting aggregate is employed as a measure of the aggregate structure. Small angle light scattering technique is used here. Different amounts of polymers are mixed to bacterial suspensions and the resulting structures are examined. The addition of polymer may foster aggregate formation by neutralization of the bacterial surface charge and enhance inter-particle bridging. The aggregation behavior may affect the efficiency of certain water and wastewater treatment processes such as dewatering and coagulation. The impacts of aggregate structure on two representative processes, namely, ultra-filtration membrane fouling and pressure filter dewatering efficiency, are studied. It is found that the looser flocs yield a more porous cake and less tendency to foul whilst more porous filter cakes yield more ready biosolids dewatering.
Skip Nav Destination
Research Article| December 01 2004
Investigation on effects of aggregate structure in water and wastewater treatment
1Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China
Search for other works by this author on:
Water Sci Technol (2004) 50 (12): 119–124.
K.W. Chau; Investigation on effects of aggregate structure in water and wastewater treatment. Water Sci Technol 1 December 2004; 50 (12): 119–124. doi: https://doi.org/10.2166/wst.2004.0703
Download citation file:
Don't already have an account? Register
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.