Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1995-05-30
1996-12-24
McCarthy, Neil
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210201, 210202, 210205, 2105121, 2105321, 210537, 210788, C02F 166
Patent
active
055870872
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of, and apparatus for, treating liquids and has particular application to the treatment of water.
The problems in the disposal of contaminated liquids are well known in the art and the treatment of such liquids contaminated by particulate matter generally comprises the steps of removing the greater part of the contaminates from the liquid to allow the clarified liquid to be discharged safely into the environment and to treat the extracted contaminates, as by recovering reusable contaminates or treating said contaminates to render said contaminates less harmful to the environment and into a condition in which the treated contaminates can be safely disposed of.
Whilst the treatment of contaminated liquids to remove solids materials in divided form therefrom is well known in the art, and conventional treatments may include the use of flocculants or coagulants and/or sedimentation, the problems of removing such particulates of solids increases as the size of the particles of the contaminant reduces. Further, the expense of removing solids particles increase as the size of the particles reduces and the conventional methods for clarifying contaminated liquids are substantially ineffective, and expensive, when the contaminate is in solution.
Whilst the use of aluminium salts and iron salts to produce their hydroxides does give some partial removal of, for example, dyestuffs in micro-particulate form or in solution such a process gives only partial removal of the dyestuff and the disposal of water contaminated by dyestuffs is a major problem.
The present invention seeks to provide a method of, and apparatus for, treating contaminated liquids to remove therefrom fine particles and contaminates in solution in the liquid.
According to the present invention there is provided a method for treating a contaminated liquid comprising the steps of adding to the contaminated liquid a first treatment material selected from the group including soluble magnesium salts, ferrous salts, manganous compounds and cuprous compounds, intimately mixing the treatment material into the contaminated liquid and then raising the pH of the contaminated liquid to a value in excess of 9.5 and separating clarified liquid from the contaminant.
According to one aspect of the present invention there is provided a method for treating a contaminated liquid comprising the steps of intimately mixing a soluble magnesium salt into the contaminated liquid, treating the contaminated liquid and magnesium salt mixture to raise the pH to a value above 9.5 and then separating the clarified liquid from the contaminant.
According to another aspect of the invention there is provided a method for treating a contaminated liquid comprising the steps of intimately mixing a ferrous salt into the contaminated liquid, treating the contaminated liquid and ferrous sulphate mixture to raise the pH to a value above 9.5 and then separating clarified liquid from the contaminant.
According to a further aspect of the present invention there is provided a method for treating a contaminated liquid comprising the steps of intimately mixing a manganous compound into the contaminated liquid, treating the contaminated liquid and manganous compound mixture to raise the pH to a value above 9.5 and then separating the clarified liquid from the contaminant.
According to a still further aspect of the present invention there is provided a method for treating a contaminated liquid comprising the steps of intimately mixing a cuprous compound into the contaminated liquid, treating the contaminated liquid and cuprous compound mixture to raise the pH to a value above 9.5 and then separating the clarified liquid from the contaminant.
Preferably the method includes the steps of raising the pH to a value above 9.5 by adding an alkali to the contaminated liquid and magnesium salt mixture.
In one embodiment in accordance with the invention the method includes the steps of selecting the alkali to comprise hydrated lime.
In another embodiment the method compri
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Drucker William A.
McCarthy Neil
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