To　provide　an　insight　into　aluminum　(Al)　control　during　the　treatment　of　micro-polluted　water,　recycling　ferric　water　treatment　sludge　(Fe-WTS)　as　an　alternative　approach　was　innovatively　investigated.　Particular　attention　was　paid　to　the　recycling　ratio　of　Fe-WTS　when　coagulated　at　an　optimized　dosage　of　both　Al-2(SO4)(3)　and　polyaluminum　chloride　(OH/Al　=　2.0,　denoted　as　PAC(20))　respectively.　Coagulation　performance,　i.e.,　turbidity,　organics　and　Al　speciation　were　also　examined.　A　morphological　analysis,　characterized　via　floc　size　and　fractal　dimension,　was　further　conducted　to　explore　the　fundamental　floc　operational　parameters　and　to　elucidate　the　mechanism　of　different　Al　species　removal.　The　results　indicate　that　an　appropriate　recycling　ratio　yields　improvements　in　residual　Al　control.　In　comparison,　Fe-WTS　is　more　effective　in　dissolved　Al　(Al-D)　removal　when　coagulated　by　Al-2(SO4)(3),　while　is　proper　to　the　reduction　of　colloidal　Al　(Al-CO)　when　coagulated　by　PAC(20).　Flocs　properties　are　significantly　correlated　with　Al　speciation　during　the　treatment.　Specifically,　floc　size　is　proportional　to　Al-CO　removal　rate,　however,　the　value　of　floc　fractal　dimension　is　inversely　proportional　to　Al-D　removal　rate.