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Table 6 Water soluble elements in grease separator contents used as substrate in BP B

From: Foam formation in full-scale biogas plants processing biogenic waste

  Grease separator contents used at biogas plant BP B Grease separator content from a canteen kitchen
  March 2012 (foaming event) May 2012 (foaming event) 4th June 2012 18th June 2012
Aluminum [mg/L] 1.42 <1.2 <1.2 <1.2 <1.2
Calcium [mg/L] 125 210 67.0 586 6.67
Iron [mg/L] 16.9 <0.6 5.82 37.8 1.53
Magnesium [mg/L] 18.8 41.0 11.7 80.4 6.37
Manganese [mg/L] <0.2 <0.2 <0.2 2.32 <0.2
Phosphorus [mg/L] 31.7 66.6 38.4 130 14.6
Potassium [mg/L] 52.8 77.8 1,500 143 28,2
Sulfur [mg/L] 26.1 46.6 33.8 53.2 39.4
Zinc [mg/L] 10.5 <1.2 <1.2 <1.2 <1.2
  1. Grease separator content from a canteen kitchen served as reference.