Effect of recirculation of currant-finishing wastewater (CFW) on its composition.
The feasibility of recirculation of currant-finishing wastewater in a currant-wash process was investigated in a laboratory scale plant. Recycle ratios from 0% to 95% were examined. By increasing the recycle ratio, effluent BOD increased from 681 to 5378 mg/l, effluent COD from 3808 to 43,722 mg/l, total suspended solids from 12.3 to 57.7 g/l, total sugars from 2.57 to 42.13 g/l, total phosphorus from 0.79 to 5.14 mg/l, total Kjeldahl nitrogen from 7.36 to 51.9 mg/l and total phenolic compounds from 0.095 to 1.13 g/l, while fresh water addition decreased from 6 to 0.3 kg/kg of currants processed and total sugars loss from 15.43 to 12.64 g/kg of currants processed. For a recycle ratio of 95%, the mass of currants recovered as a final product increased by 10% due to the proportional decrease in the sugars wasted per kg of currants processed.
Vlyssides
A G
AG
National Technical University of Athens, School of Chemical Engineering, Laboratory of Organic and Chemical Technology, Athens, Greece. avlys@tee.gr
Karlis
P K
PK
Barampouti
E M P
EM
Mai
S T
ST
D002241:Carbohydrates / Q000032:analysis; D019649:Food Industry; D007220:Industrial Waste; D009584:Nitrogen / Q000032:analysis; D010636:Phenols / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D031965:Ribes / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry
D002241:Carbohydrates; D007220:Industrial Waste; D010636:Phenols; D014867:Water; D010758:Phosphorus; D009584:Nitrogen