Annual Report of the Department of Public Health for the Year Ending ... 1936-37

Cover Annual Report of the Department of Public Health for the Year Ending ... 1936-37
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The color of some of the effluents was frequently five times that of the raw waste. [ It seems practicable to operate a filter like No. 659 to successfully treat a 50 per cent mixture of waste and water if the suspended matters are thoroughly removed.
This presents some difficulties because the relatively high specific gravity of the waste which contains around 1.5 per cent of soluble solids tends to make the suspended solids settle slowly. Laboratory tests show that when the waste is diluted w
...ith 90 per cent water the suspended solids settle more readily. Filter No. 659 was oper- ated several weeks at a rate of 250,000 gallons per acre daily with this diluted settled waste. Under these conditions it was handling the same volume of waste as before and the removal of tannins was slightly better.
Treatment of Leatherboard Waste by Filtration through Average Analyses (Parts per Million) Sand Ammonia Kjeldahl Nitrogen « ■d ft ALBUMINOID a o'fi c JB C 02 as >. c X o O o £ "3 o o "3 o o '-' 3 2 o ca a §^ •a

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