| 摘要 |
A process and apparatus are described for clarifying milkhouse wastewater, which is rich in phosphorous and also contains colloïdal and suspended solids. This wastewater is obtained during the washing of milk pipelines of a diary milking system. The wastewater is collected in a treatment vessel, with the ratio of suspended solids to phosphorus in the wastewater being lowered either before entering or while in the treatment vessel. To this wastewater of lowered suspended solids:phosphorus ratio, there is added sufficient calcium, preferably in the form of lime, to react with all of the phosphorus in the wastewater to form calcium hydroxyapatite precipitate. It has been discovered that, by lowering the ratio of suspended solids:phosphorus, sufficient calcium hydroxyapatite precipitate is formed to sweep with it during settling substantially all colloïdal and suspended solids thereby leaving a clear, environmentally safe effluent water. The ratio of suspended solids:phosphorus is easily lowered by initially flushing the system with a small quantity of water and separately collecting this initial flush water having a high concentration of suspended solids.
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