Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1995-09-11
1996-10-08
Hruskoci, Peter A.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210687, 210712, 210724, 210906, 134 13, 134 2213, C02F 152
Patent
active
055628290
ABSTRACT:
A process and apparatus are described for clarifying milkhouse wastewater, which is rich in phosphorus and also contains colloidal and suspended solids. This wastewater is obtained during the washing of milk pipelines of a dairy 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 colloidal 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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Kollaard William
Malcolm Ian
Weil Claude
Agricultural Research Institute of Ontario
Hruskoci Peter A.
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