Normal Granular Media Filtration

Granular media filtration (rapid sand filters) has proven very successful as a means of liquid-solids separation. The simple design and operation processes make it applicable to wastewater streams containing up to 200 mg/L suspended solids. Automation based on easily measured parameters results in minimum operation

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FIGURE 5.5 Rock filter performance, West Monroe, Louisiana. (From Starnberg, J.B. et al., Simple Rock Filter Upgrades Lagoon Effluent to AWT Quality in West Monroe, LA, paper presented at 57th Conf. Water Pollution Control Federation, New Orleans, LA, 1984.)

and maintenance costs; however, when regular granular media filtration has been applied to the removal of algae from wastewater stabilization effluents, very poor results have been obtained. Good efficiencies can be obtained when chemicals are added prior to filtration or when the wastewater is treated by coagulation and flocculation prior to filtration. Table 5.14 contains a summary of the results with

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