TIANJia-yu,SIWen-yan,GENGMing-yue,et al.Chemical Cleaning Characteristics of Flat-sheet Ceramic Membrane in MBR with NaOH/PMS[J].China Water & Wastewater,2024,40(15):16-22.
NaOH/PMS对MBR中空平板陶瓷膜的化学清洗特性
- Title:
- Chemical Cleaning Characteristics of Flat-sheet Ceramic Membrane in MBR with NaOH/PMS
- Keywords:
- membrane bioreactor; flat-sheet ceramic membrane; chemical cleaning; peroxymonosulfate; base activation
- 摘要:
- 膜生物反应器（MBR）的不可逆膜污染是限制其长效稳定运行的关键因素，而传统次氯酸钠（NaClO）清洗可能加剧MBR系统后续膜污染。为此，针对中空平板陶瓷膜MBR提出了一种碱活化过一硫酸盐（PMS）的免氯化学清洗方法。在PMS浓度为1.0 mmol/L和NaOH浓度为0.03 mol/L时，化学清洗效率达到70.9%，优于相同条件下NaClO的清洗效果（60.6%）。NaOH/PMS体系可优先去除膜表面多糖、蛋白质等大分子物质，并有效剥离滤饼层，从而恢复膜通量。机理分析显示，NaOH/PMS体系中起主要清洗作用的活性物种为单线态氧（1O2）。NaOH/PMS体系的清洗液药剂成本约为1.11 元/m3，是一种高效、清洁的陶瓷膜化学清洗方法。
- Abstract:
- Irreversible membrane fouling is the main factor limiting long-term stable operation of membrane bioreactor (MBR), and traditional sodium hypochlorite (NaClO) cleaning may exacerbate subsequent membrane fouling in MBR systems. For this reason, this study proposed a base-activated peroxymonosulfate (PMS) chemical cleaning method with no use of NaClO for hollow flat-sheet ceramic MBR. The chemical cleaning efficiency could reach 70.9% at PMS concentration of 1.0 mmol/L and NaOH concentration of 0.03 mol/L, which was higher than NaClO under the same cleaning conditions (60.6%). The NaOH/PMS system preferentially removed polysaccharides and proteins on the membrane surface, and effectively peeled off the cake layer, thus restoring the membrane flux. Mechanism analysis displayed that singlet oxygen (1O2) was the major reactive species contributing to elimination of irreversible fouling during the chemical cleaning. NaOH/PMS was a highly efficient and clean chemical cleaning method for ceramic membrane, and the cost of cleaning solution was approximately 1.11 yuan/m3.
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