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Applying the coagulation and reverse osmosis for water recovery from evaporative water

100%

Michel M. M., Reczek L., Siwiec T., Rudnicki P.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2014

tom 46

nr 4

Evaporative water from the concentration of yeast slurry is a potential raw material for water recovery. It is characterized by low pH (4.6–6.3), increased turbidity (3.65–13.7 NTU), and high content of total organic carbon (356–754 mg/L). Its treatment in the volume coagulation process using NaOH and coagulant PIX 111, was studied. Water turbidity was lowered to a value below 1 NTU, but coagulation did not allow for the removal of organic compounds. Coagulation was effective at temperatures of 20 and 40°C. Pre- -treatment of the feed water for RO included alkalization, coagulation, sedimentation, and 5 μm fine filtration (variant I), as well as single 5 μm fine filtration (variant II as a blank). In variant I the feed with improved properties was achieved. Membrane filtration allowed for effective desalination of evaporative water, 98 and 73% conductivity retention was obtained, depending on the method of the feed pre-treatment. The organic compounds were removed less effi ciently, at 94 and 84%, respectively.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 Michel M. M.

1 Reczek L.

1 Rudnicki P.

1 Siwiec T.

1 2014

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Applying the coagulation and reverse osmosis for water recovery from evaporative water