A Method of Destroying Or Preventing the Growth of Algæ and Certain Pathogenic Bacteria in Water Supplies, Volumes 57-65 |
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Common terms and phrases
24-hour culture 48 hours action of copper algæ algal amount of copper aquaria Bacillus coli Bacillus typhi bo bo boards of health Bordeaux mixture cates no growth Check coli colloidal solution Colonies conducted in test containing 5 cc copper foil copper sulphate Culture 3 hours desired amount dilute Duration of exposure Effect of copper Experiment conducted exposure to action filtration fish foil was sterilized g g g growth after 48 growth of alge hours 12 hours hours old immediately before inoculating indicates growth inoculating the tubes Investigations kilogram Laboratory of Plant larvæ loop method odor and taste organisms PATHOGENIC BACTERIA Pathologist Petri dishes phate Plant Breeding Plant Physiology pollution preventing the growth previously treated reservoir Saprophytic Scientific Assistant solution of copper Spirogyra sterilized water sulphate to water sulphate upon Bacillus temperature.a Determination test tubes toxic treatment trouble tubes each containing tubes inoculated tubes of bouillon typhoid vfa vfa
Popular passages
Page 25 - Place the required number of pounds of copper sulphate in a coarse bag — gunny sack or some equally loose mesh — and, attaching this to the stern of a rowboat near the surface of the water, row slowly back and forth over the reservoir, on each trip keeping the boat within ten to twenty feet of the previous path. In this manner about a hundred pounds of copper sulphate can be distributed in one hour.
Page 44 - Definite knowledge in regard to what organisms are present, the constitution of the water, its temperature, and other important facts; are necessary before it is possible to determine the proper amount of copper sulphate to be added. A microscopical examination thus becomes as important as a bacteriological or chemical analysis. No rule for determining the amount of copper sulphate to be added can be given. Each body of water must be treated in the light of its special conditions.
Page 43 - The disagreeable odors and tastes so often present in drinking water are due almost exclusively to algae, although the economic importance of studying these plants has not been recognized until recent years. These algal forms are widely distributed, and reservoirs in many States have been rendered unfit for use by their presence. The methods now known for preventing or removing the odors and tastes caused by alga?
Page 13 - In one notable instance millions of dollars have been spent in the removal of earth and the substitution of gravel at the bottom of an immense new reservoir. It remains to be seen, however, whether this will be sufficient to insure permanent freedom from these troublesome plants. It is certain that attempts of this kind will delay the appearance of algae in quantity, and, wherever it is possible to do so, every effort should be made not only to clean up the reservoir at the time of its construction,...
Page 23 - ... and phosphorus. Moreover, in the case of copper, after suspension of the dose the injured functions return to the normal. It is evident that there is still a considerable difference of opinion among eminent authorities as to the exact amount of copper which may be injurious, but as a very conservative limit we may accept 0.02 gram as the amount that may with safety be absorbed daily. According to Merck's Index, the National Dispensatory, and the United States Dispensatory, the dose of copper...
Page 10 - On Some Impurities of Drinking Water Caused by Vegetable Growths. Supplement to 1st Ann. Rept. Mass. State Board of Health. Boston, 1880. Relations of Certain Forms of Algae to Disagreeable Tastes and Odors. Science, II, 333, 1883.
Page 25 - By increasing the number of boats, and, in the case of very deep reservoirs, hanging two or three bags to each boat, the treatment of even a large reservoir may be accomplished in from four to six hours. It is necessary, of course, to reduce as much as possible the time required for applying the copper, so that for immense supplies with a capacity of several...
Page 3 - A Method of Destroying or Preventing the Growth of Algae and Certain Pathogenic Bacteria in Water Supplies," by George T. Moore, Physiologist and Algologist in Charge of Laboratory of Plant Physiology, and Karl F. Kellerman, Assistant in Physiology, the subject has attracted much attention, especially in the medical journals.
Page 43 - ... accomplish result. It is therefore desirable that some new, cheap, harmless, and effective method be devised for ridding reservoirs of these pests. It has been found that copper sulphate in a dilution so great as to be colorless, tasteless, and harmless to man, is sufficiently toxic to the alga?
Page 10 - Algse found in the Water Supplies of the City of Boston, 1877. On Some Impurities of Drinking Water Caused by Vegetable Growths. Supplement to 1st Ann. Rept. Mass. State Board of Health. Boston, 1880. Relations of Certain Forms of Alpse to Disagreeable Tastes and Odors.