Treatment of dairy wastewater by two-stage membrane operation with ultrafiltration and nanofiltration

被引：20
|
作者：
Gong, Yan-Wen [1 ]
Zhang, Hong-Xun [1 ]
Cheng, Xue-Ni [1 ]
机构：
[1] Hennan Univ Technol, Sch Chem & Chem Engn, Zhengzhou 450001, Peoples R China
来源：
WATER SCIENCE AND TECHNOLOGY | 2012年 / 65卷 / 05期
关键词：
dairy wastewater; lactose; nanofiltration; protein; ultrafiltration; REVERSE-OSMOSIS MEMBRANES; SKIM MILK; FILTRATION; REUSE;
D O I：
10.2166/wst.2012.937
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Treatment of dairy wastewater by a two-stage membrane process with ultrafiltration (UF) and nanofiltration (NF) was investigated. The results showed that the flux of UF was higher at pH = 4.6 than that at pH = 8 because the resistance of the fouling membrane was lower at the isoelectric point of protein (pH = 4.6) in UF operation. Protein rejection exceeded 99% by UF + NF operation. Lactose rejections were 98.5 and 54% for UF + NF90 and UF + NF270 respectively. Experiments on membrane cleaning showed that the fouling layer of UF and NF was mainly protein and casein which could be removed by aqueous NaOH with pH = 10. The result of long-term experiments showed that the chemical oxygen demand (COD) of NF90 permeates was below 70 mg/L consistently and the wastewater could be concentrated to 24% by a two-stage membrane process.
引用
收藏
页码：915 / 919
页数：5
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