| 摘要 |
Surface water contaminated with organic matter and organic micro-pollutants is treated by peroxido-coagulation involving radical oxidn. by addn. of H2O2 and a ferrous salt under conditions allowing of coagulation of the organic matter and of oxidn. of the organic micro-pollutants. The amts. of H2O2 and ferrous salt are such as to give a molar ratio of H2O2:Fe++ of 0.5-2.0. At least part of the H2O2 is added first, followed by the ferrous salt. Peroxido-coagulation is at pH at least 4.5 (5-6), according to the degree of mineralisation of the water, to reduce the inhibiting effect of carbonates in the water. In later steps, the residual H2O2 is destroyed by treatment with active C or ozonisation, and the pH is brought to 7-8.5, close to the calcocarbonic equilibrium, to render the water potable. The amt. of ferrous salt used is such as to give a ratio of Fe++:organic matter of at least 2 g Fe++/g of total organic C (TOC). USE - Application is esp. to water with a low mineral content, to render it drinkable. Esp., the organic matter is formed by humic substances, and the micro-pollutants by pesticides, chlorinated solvents, phenols and hydrocarbons (claimed).
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