CONSIDERABLEinterest is being shown in the use of chlorinated copperas (ferrous sulfate) as a coagulant.The work described by Mohlman and Palmer (9) with activated-sludge coagulation and the results obtained by Hedgepeth and Olsen (3) with a highly colored water indicate the value of this material. Enslow (£) has recently presented data relating to the operating economic value of this coagulant and also concerning the reactions involved.Laboratory experiments under simulated plant conditions, as explained in a previous article (4), and using the same method of procedure, show that this reagent is a satisfactory coagulant for turbid water, being comparable to alum in this respect. A compact, easily settling floe is obtained at any pH value above 3.5. This is in sharp contrast to the value found efficient for ferric hydroxide floe (4) when using the usual iron and lime treatment.
Colonel Whitmore tells in plain language just what lipovaccines are and within what limits their usefulness lies. His paper will dispel any misunderstanding about them in the minds of those not specialists.
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