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Description: Silage effluent, formed by grass fermentation, contains variable amounts of soluble organic matter which is readily oxidized, having a high biochemical oxygen demand of about 90 000 mg/L, and is the cause of summertime water pollution. Effluent production is dependent on grass moisture (MC), producing 10 L/t at 75% MC and 200 L/t at 85% MC. Fifty percent of total volume can be produced within 7 d after silo filling. Currently, disposal is by land spreading. Wilting is not widely practiced due to the climate. Feeding 21.6 L of effluent (95.4% MC) to cattle and pigs is equivalent to 1 kg of barley (20% MC). A study of effluent concentration and treatment by membrane filtration was carried out. Six different reverse osmosis membranes were tested in series at a transmembrane pressure of 0.3 kPa, effluent temperature was kept at less than 32?C. Three membranes were then selected for individual testing. Percentage reduction in chemical oxygen demand varied from 75 to 85%. Permeate flux declined from 18 L/m2/h at 2% DM concentration to 2 L/m2/h at 12% DM. Per centage retention in DM, nitrogen, phosphorus, potassium, calcium magnesium, carbohydrate and lactic acid were also measured. Appli cation at farm level is unlikely due to low permeate flux. Application is considered possible as part of an integrated waste management facility.

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Citation: A.P. Dunlea and V.A. Dodd 1989. THE APPLICATION OF MEMBRANE FILTRATION TO SILAGE EFFLUENT. Canadian Agricultural Engineering 31(1):39-43.
Volume: 31
Issue: 1
Pages -
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Date: 1989
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Type: Text.Article
Format: PDF
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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