| 摘要 |
<p>1,268,224. Treating water. KURITA WATER INDUSTRIES Ltd. 27 March, 1969 [29 March, 1968], No. 16191/69. Heading C1C. Water containing organic waste matter is treated by contact with activated sludge containing denitrifying bacteria in the presence of nitrate and/or nitrite ions and under anaerobic conditions. The nitrate and/or nitrite ions may be present originally in the water or added thereto either in solid form or in solution in other waste water. The process may be carried out by the mixture and rotary agitation of the sludge and waste water in a tank, Fig. 1 (not shown), or by passing the waste water upwardly over packing material supporting the sludge or through a sludge blanket in a column, Fig. 2 (not shown).</p> |
