A　series　of　model　extracellular　polymeric　substance　(EPS)　solutions　was　prepared　by　using　sodium　alginate,　humic　acid　and　some　proteins　on　the　basis　of　the　components　of　actual　EPS　extracted　from　sludge　for　laboratory-scale　SBR　by　the　formaldehyde-NaOH　method.　The　dead-end　model　filter　of　these　solutions　was　carried　out　with　0.1　mu　m　PVDF　MF　membrane　under　a　transmembrane　pressure　of　0.1　MPa　and　the　filterability　behaviors　of　these　solutions　were　also　investigated.　The　experimental　results　showed　that　the　filterability　behaviors　of　BSA,　beta-lactoglobulin　and　lysozyme　model　solutions　with　five　times　the　protein　concentration　in　the　actual　EPS　were　similar　with　that　of　the　actual　EPS　solution;　in　addition.　the　addition　of　sodium　alginate　and　humic　acid　enhanced　the　rejection　of　proteins,　and　the　values　of　alpha(c)　of　model　solutions　increased　with　the　addition　of　sodium　alginate　or　humic　acid,　and　especially　the　values　of　alpha(c)　of　the　model　solution　greatly　increased　with　the　addition　of　humic　acid,　and　the　presence　of　protein　in　the　mixed　components　model　solutions　caused　the　decrease　of　the　alpha(c)　values　of　sodium　alginate.　(C)　2009　Published　by　Elsevier　B.V.