两级反渗透系统中给、浓、产水的pH值分析

Analysis for pH of feed water,concentrated water and production water in two-stage reverse osmosis system

分析了一、二级反渗透系统中给水、浓水及产水pH值之间的关系,确定了一、二级系统透盐率最低时的给水pH值均为7.75,调节二级给水的pH值对全系统透盐率影响较大;得到了浓水、产水pH值随给水pH值的变化规律及其沿流程的变化趋势;明确了最佳给水、浓水加权平均p H值的概念。

The relation of p H of feed water,concentrated water and production water was analyzed in two-stage reverse osmosis system. The feed water pH was 7. 75 when the salt penetration rate was the lowest in the two-stage system. The influence on salt penetration rate was large in whole system adjusting secondary feed water pH. The variation regularity and tendency of concentrated water pH and production water p H were obtained with the variation of feed water pH. The concept of optimal weighted average pH of feed water and concentrated water was confirmed.