| Show Dih poaul at wore chier mass the sewage precipitation plant at worcester mas alas recently ly completed under the supervision of city engineer allen alien and in which the principle of chemical precipitation la is used is it do scribed ascribed as consisting con mainly of a series of largo large open tanks solidly constructed of brlik arid and having a combined surface area of about ten acres thoro there Is also a building in which are arc a mill for grinding the chemicals and vats in which these theo chemicals after being ground tire are mixed walh mith a small quantity of crude sewage age this mixture is then discharged into tire stream which hows flows from tho the sowers into the brick bain baan where here some chemicals chiefly lime combine coin binn with some of tho the impurities i forming a coagan luio into which as it settles sel llos carries with it to tire the bottom of aba tn basin the abo other impurities puri ties leaving tho clarified sewage sew ago this cla clarified rifled sewage Is then allowed to how flow off into tho the river arid and then the sludge Is drawn off from below arid and deposits cl on land adjacent to tho the works hereit here it will wiH bo be plowed under and an it Is 13 ex to cause no DO detriment to the health or comfort of the neighborhood tire basins are so con t thai hat all roar may bo be used simultaneously or tile llin flow of sewage may ile bo ent cut 0 off ff from any core of them tor for removing the sludge lor for cleaning or repairs the works have a capacity equal to the daily purl fi cation of ga galloni lions of sewage arid and the annual cost of if their role mainton maintenance ance 14 estimated at about aff rid 1 I |
