| 摘要 |
PURPOSE:To dispose the waste liquor of high concentration with high efficiency at a low cost, by treating said waste liquor of high concentration, e.g. night soil, without diluting it or after extremely slightly diluting it, in the step of biotreatment, and then controlling a pH in the step of flocculatedly separating COD, phosphorus, etc. below 6.5. CONSTITUTION:The waste liquor of high concentration, e.g. night soil, excrementitious matter of cattle or waste water from fisheries, without being diluted or after being extremely slightly diluted is biotreated. Thereafter, high-concentration treatment is performed while controlling a pH in the step of flocculative separation for removing COD, phosphorus, chromacity, fine SS, etc. below 6.5. For instance, when aluminum sulfate in an amount of 100ppm as Al2O3 is added as a flocculant to night soil after being extremely slightly diluted and then biotreated, the sufficient function of flocculation separation can be maintained without substantially deteriorating the function of phosphorus removal by holding the pH below 6.5. |
