초록 ▼

A composition for the purification of water includes a suitable coagulant for coagulating solid impurities dispersed in the water to form flocs and an organic hydrophilic colloid capable, when dispersed in the water, of absorbing large quantities of water to form a sol for aggregating the flocs. The

A composition for the purification of water includes a suitable coagulant for coagulating solid impurities dispersed in the water to form flocs and an organic hydrophilic colloid capable, when dispersed in the water, of absorbing large quantities of water to form a sol for aggregating the flocs. The proportion of organic hydrophilic colloid in the composition is such that when the composition is used to purify the intended quantity of water, the organic hydrophilic colloid does not interfere with coagulant dispersal in the water or with floc formation.

대표청구항 ▼

A composition for the purification of water which is in unit dosage form for the single step batch purification of a relatively small predetermined volume of water, and which comprises: 40-60% (by mass) aluminum sulphate as a coagulant for rapidly coagulating solid impurities dispersed in the water

A composition for the purification of water which is in unit dosage form for the single step batch purification of a relatively small predetermined volume of water, and which comprises: 40-60% (by mass) aluminum sulphate as a coagulant for rapidly coagulating solid impurities dispersed in the water to form primary flocs; 15-25% (by mass) sodium bicarbonate as a coagulant promotor; 20-25% (by mass) bentonite as a clay; 0.5-3% (by mass) sodium dichloroisocyanurate as a first micro-biocide capable of releasing a micro-biocidally effective amount of a micro-biocidal agent into the water at a rate no slower than the rate of formation of the primary flocs, thereby to kill off micro-organisms in the water during, or prior to, primary floc formation; 1-3% (by mass) carboxymethylcellulose as an organic hydrophilic colloid capable, when dispersed simultaneously with the coagulant and first micro-biocide in water, of hydrating to form a sol for aggregating the primary flocs into larger secondary flocs, the proportion of organic hydrophilic colloid in the composition being such that when the composition is used to purify the intended quantity of water, the organic hydrophilic colloid does not interfere with coagulant dispersal in the water or with primary floc formation so that the rate of hydration of the colloid is hence slower than the rate of formation of the primary flocs; 1-3% (by mass) synthetic silica compound as a silica-based substance; 0.02-0.15% (by mass) polyacrylamide as a secondary colloid; and 1-4% (by mass) halazone as a second micro-biocide capable of being aggregated by the hydrophilic colloid with the primary flocs, into the secondary flocs, and also being capable of killing off micro-organisms in the secondary flocs, the second micro-biocide hence differing from the first micro-biocide in that it is capable of releasing a micro-biocidally effective amount of a second micro-biocidal agent into the water at a rate slower than the rate of formation of the primary flocs.