|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|6466665||1422965||2017||10 صفحه PDF||سفارش دهید||دانلود رایگان|
- An integrated process recycles water, caseins, whey proteins and lactose.
- This process can mitigate the sludge/retentate disposal and membrane fouling.
- IP-UF pretreatment greatly reduces fouling and concentration polarization of NF.
- NF retentate with concentrated lactose is obtained with IP-UF pretreatment.
- Fermentation fed by NF retentate with IP-UF pretreatment produces more LA.
An integrated isoelectric precipitation (IP) - ultrafiltration (UF) - nanofiltration (NF) - lactic acid (LA) fermentation process was established for recovering water, proteins, cells and LA from model dairy wastewater (MDW). This process could solve the problems of sludge/retentate disposal and membrane fouling during membrane-based wastewater treatment. The IP process greatly retarded concentration polarization and fouling of UF. However, PES membrane was still severely fouled by whey proteins. XPS results showed that carboxyl groups (CO) belonging to the proteins was on PES10 surface, but it was not found on Ultracel PLGC membrane. Proteins in MDW with IP were completely retained by Ultracel PLGC UF membrane and lactose almost passed through. After IP-UF pretreatment, the fouling of NF membrane was greatly retarded (irreversible fouling decreased from 44.4% to 11.1% in a pilot-plant test). Thus, the volume reduction ratio was highly increased to 37 and the retentate with high strength lactose of 44.2Â gÂ Lâ1 was obtained. With a model NF retentate (45.0Â gÂ Lâ1 of lactose) without proteins, 5.42Â gÂ Lâ1 of cell mass and 37.6Â gÂ Lâ1 of LA concentration were produced by the LA producer B. coagulans IPE22.
Journal: Chemical Engineering Journal - Volume 313, 1 April 2017, Pages 1061-1070