| 摘要 |
1,275,184. Flocculating sewage sludge FIRESTONE TIRE & RUBBER CO 25 June 1970 [30 June 1969] 30982/70 Heading C1C [Also in Divisions C3 and C4-C5] Elutriated sewage sludge is flocculated by the addition of quaternary ammonium polymers obtained by reacting a tertiary amine such as trimethylamine or pyridine with a homopolymer of epichlorohydrin or a copolymer of epichlorohydrin or a copolymer of epichlorohydrin and an alkylene oxide, the quaternated polymers having a molecular weight of at least 150,000. |
