| 摘要 |
<p>Organic impurities are removed from water (1) by mixing (3) with a chemical precipitation reagent (2) to remove organic substances by charge neutralisation thereof; separating (5) the resultant sludge (4) from the treated water (14); subjecting the separated sludge (4) to oxidising conditions (7,8) to oxidize the organic substances in the sludge (4); dewatering (10) the oxidised sludge; and recycling at least a portion (11) of the dewatered sludge, if necessary after regeneration to provide the chemical precipitation reagent (2), for mixing with further impurities-containing water (1). Preferably, the reagent (2) is a salt of a metal having an insoluble hydroxide and the effluent is at acid pH when the salt is added so that organic substances can be removed both by charge neutralization of hydrophilic organic substances and by entrainment of hydrophobic organic substances. <IMAGE></p> |
