stuvite formation (1).pptx-lechate treatde onet

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1. Waste to Energy Project

2. Background of leachate Incineration Leachate is high concentration of organic pollutants. Commonly, the COD concentration is around 40000-80000 mg/L. Leachate is high concentration of ammonical nitrogen around 1000-2000 mg/L. Leachate has high concentration of heavy metal ions and salts, which come from raw municipal waste. Low PH and contain large amount of organic acids. High concentration of SS.

3. Without Coagulation ?? A high contents of calcium in the influent of an anaerobic reactor can lead to excessive precipitation of CaCO 3 . Scaling of reactor walls and effluent pipes Loss of buffer capacity. Loss of specific methanogenic activity. Space occupation by inorganic precipitates.

4. Struvite Formation If the concentration of soluble Mg 2+ , NH 4 + and orthophosphate exceed solubility. Formation of struvite

5. Struvite Solubility Curve

6. Coagulation Process The ferrous sulfate had been used in water and wastewater treatment. It also has been used for the removal of nitrogen, chemical phosphorus removal. ferrous sulfate is added after pH adjustment. The chemical reactions in ferrous coagulation treatment.

7. Thank You