超滤/微滤膜表征
Pore size
Molecullar weigh cut-off using dextran or polyethylene glycol (PEG) rejection. The pore size is determine as the molecular weigh of particle that can be rejected 90% by membrane. The filtration is conducted by filtering the serries of differend dextran MW solution. The rejection profile than defined by the linearization of the rejection-MW curve. Normaly the concentration of the dextran is less than 2% w/w.
Procedure of PEG rejection test (A. D. Sabde et al. [1997]):
Reagents:
- 5% w/v BaCl2 in 1 N HCl (100 ml)
- 100 ml of 2% KI (w/v) + 1.27 g I2 –> This mixture than dilluted 10 times.
全膜法水处理
全膜法工艺和传统的各种水处理工艺比较，有操作简单、运行费用小、出水水质优良、环保等优点,是一种前沿的水处理技术。全膜法水处理是一个概念，其实真正做到全膜法水处理还是比较难的。全膜法水处理主要是根据来水水质和要求水质的不同，结合膜生物反应器（MBR）、超滤（MF）、超滤（UF）、纳滤（NF）、反渗透（RO）和电除盐（EDI）等膜技术的特点，进行不同的技术组合，出水满足各类除盐水水质要求。
