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This article is frequently referenced in literature that is of interest to us. However, since it is a Master's Thesis from an Asian university, it has been difficult to acquire. This article would be a good bet for finding spacing guidelines and possibly some analysis in terms of the velocity gradients that solid particles encounter in the clarifier (could provide comparisons for our floc rollup findings).

10. Steady-state humic-acid-containing blanket in upflow suspended bed

S.S. Sunga, D.J. Leea, Corresponding Author Contact Information, E-mail The Corresponding Author and Chihpin Huangb
Chemical Engineering Department, National Taiwan University, Taipei 10617, Taiwan
Institute of Environmental Engineering, National Chiao Tung University, Hsinchu 300, Taiwan
Received 1 July 2004;
revised 2 December 2004;
accepted 7 December 2004.
Available online 3 February 2005.

Link: http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6V73-4FD9SX6-3-W&_cdi=5831&_user=492137&_pii=S0043135404005780&_origin=search&_coverDate=03%2F01%2F2005&_sk=999609994&view=c&wchp=dGLzVtb-zSkzV&md5=675f780625123dc2025924fb0e401033&ie=/sdarticle.pdf^{Image Added}
Summary: The article assesses the performance of floc blankets with different NOM and clay suspensions over a range of upflow velocities. The coagulant used was PACl. Clay was used as a turbidity source - 40 NTU and 450 NTU. It was found that the optimal dose of NOM was around 1 mg/L

11. Floc Strength Evaluation at Alternative Shearing with Presence of Natural Organic Matters

Shung-Shuan Sunga; Sheau-Pyng Jub; Chien Hsua; Arun S. Mujumdarc; Duu-Jong Lee
Link: http://www.informaworld.com/smpp/ftinterface~content=a794890674~fulltext=713240928~frm=content^{Image Added}
Summary: This article focuses on the effects of NOM on fractal dimensions of flocs subject to different shearing. The study used synthetic raw water prepared with a "prescribed quantity of UK ball clay powder and solution with 0.1 g L-1 NaHCO3 and 1.23 g L-1 NaClO4 to yield solid content of 0.125 g L-1, yielding turbidity of 100 NTU, suspension alkalinity of 100 mg L-1 equivalent, and pH of 7.0." Starch, Chitosan, and humic acid were added to the solution, sheared, and the results compared. It was found that flocs with humic acid were more susceptible to shear and generally produce smaller flocs.