Concentration of precooking wastewater from tuna cannery factory by ultrafiltration membrane
1987
Pornchai Phisutthithuwawong | Phaisan Lertsalaluck | Somsak Saetang
Study consisted of 2 stages. First, the wastewater characteristics were analysed both in quality and quantity. Second, the concentration of protein was developed by ultrafiltration membrane. The first stage showed that the precooking wastewater of 70 cubic meter/day containing 18,650 mg. BOD/1. and 15,168 mg/1. of protein was the most suitable for further study according to the abundance of existing valuable protein. Three types of membrane, YM5, PM10 and PM30 which have a MW-Cut off 5,000, 10,000 and 30,000 respectively. PM10 had best performance and the protein in precooking wastewater had a molecular weight less than 5,000. In long term experiment, YM5 was used in filtration until 77-ml permeate was collected. The percentage of reject was slightly decreased but the total nitrogen in concentrate was 2-fold higher than the total nitrogen in unfiltered precooking wastewater. The lipid content in precooking wastewater did not effect the flux and rejection till the 54.6-ml permeate collection.
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