Drinking-water-precipitated　sludge,　characterized　as　accumulated　suspended　solids　and　organic　or　inorganic　components　is　produced　in　large　quantities　during　the　coagulation　process.　The　proper　recycling　of　drinking　water　residual　sludge　is　an　effective　method　to　enhance　low-turbidity　water　treatment.　The　current　research　primarily　focused　on　the　settled　water　quality　in　terms　of　bulk　parameters,　i.e.　fine　particle　distribution,　turbidity,　CODMn,　total　organic　carbon,　dissolved　organic　carbon　and　UV254　removal.　Residual　aluminum　under　variable　sludge　recycle　designs　was　also　studied.　In　addition,　flocs　characteristics　was　analyzed　using　optical　microscopy　and　Image　J　software.　The　results　indicated　that　recycled　sludge　combined　with　activated　silica　(AS)　exhibited　excellent　potential　for　turbidity　and　particulates　removal,　which　might　be　attributed　to　jointed　effects　of　sweep　floc,　adsorption,　and　bridging.　Moreover,　powdered　activated　carbon　(PAC)　addition　was　significantly　further　improving　organic　matters　elimination.　Residual　total　aluminum　or　dissolved　aluminum　exceeded　the　requirement　of　drinking　water　treatment　standard　(0.2　mg/L)　in　China,　indicating　that　pretreatments　or　subsequent　treatments　should　be　implemented　or　optimized　to　avert　secondary　pollution.　Image　analysis　of　regrowth　flocs　confirmed　that　recycled　sludge　combined　with　AS　or/and　PAC　could　be　significant　for　the　coagulation　treatment　of　low-turbidity　water.