Pro­cess sequence of a decan­ter centrifuge

The sludge, homo­ge­nis­ed in advan­ce if pos­si­ble, is fed to the decan­ter via an upstream mace­ra­tor to pro­tect the plant with the help of the built-in sludge pump. A poly­mer solu­ti­on is intro­du­ced into this pro­duct stream — depen­ding on the quan­ti­ty and natu­re of the sludge — to pro­mo­te the floc­cu­la­ti­on of sus­pen­ded mat­ter and thus faci­li­ta­te the sub­se­quent pha­se sepa­ra­ti­on in the decan­ter. In the decan­ter, cen­tri­fu­gal forces are car­ri­ed out to sepa­ra­te the solid and liquid pha­ses. Water (cen­tra­te) and solids lea­ve the machi­ne via sepa­ra­te rou­tes. The cen­tra­te drains off via the out­let pipes and can be retur­ned to the cla­ri­fi­ca­ti­on pro­cess. The solid mat­ter (cen­tri­fu­ga­te) is con­vey­ed out of the machi­ne by a screw loca­ted in the cen­tri­fu­ge drum. If desi­red, lime can be added to the cen­tri­fu­ga­te in the mixing screw and then dischar­ged by means of a screw con­vey­or. This dewa­te­red sludge with a dry mat­ter con­tent of 25 to 30 % can be loa­ded for fur­ther uti­li­sa­ti­on as bulk mate­ri­al. In addi­ti­on to the sludge, the purest pos­si­ble ser­vice water and elec­tri­cal ener­gy are requi­red to ope­ra­te the plants, which can be gene­ra­ted by a mobi­le unit if neces­sa­ry. This makes it pos­si­ble to use it in almost any place imaginable.