不同生物污染控制条件下对反渗透污染的控制效果

Control Effect of RO Membrane Fouling under Different Biofouling Control Conditions

以微滤产水作为源水,建立处理水量为15 m^3/h的反渗透中试装置,结合预测和表征反渗透生物污染的微生物黏膜形成率(BFR)指标,分析在不同生物污染控制措施下反渗透生物污染的程度及控制效果。结果表明,增加进水余氯浓度和非氧化杀菌剂投加频次后,反渗透系统的污染问题得到了较好的控制,3组试验的反渗透月标准化产水量下降率分别为23.7%、15.6%和8.6%,微生物黏膜形成率分别为11.37、3.87和0.29 pg/(cm^2·d)。通过分析微生物黏膜形成率与反渗透污染程度的关系可以看出,在较高微生物黏膜形成率条件下,反渗透膜标准化产水量下降趋势较快,反渗透系统污染程度增长明显。微生物黏膜形成率能较好地反映反渗透系统受污染的程度,可以作为预测反渗透生物污染趋势的有效指标。同时药剂成本只增加了0.033元/m^3,处理成本增加不大,可以在实际生产中得以应用。

A RO pilot plant feeding MF effluent with a treatment capacity of 15 m^3/h was established.Combined with the prediction and characterization of the biofilm formation rate(BFR)of RO membrane biofouling,the degree and control effect of RO membrane biofouling under different biofouling control measures were analyzed.The fouling of the RO system was well controlled after increasing the concentration of residual chlorine in water and the frequency of adding non-oxidizing fungicide.The standardized monthly water yield decrease rate of RO was 23.7%,15.6% and 8.6%,respectively,and the BFR were 11.37 pg/(cm^2·d),3.87 pg/(cm2·d)and 0.29 pg/(cm^2·d),respectively.By analyzing the relationship between BFR and RO membrane biofouling,it could be found that the standardized water yield of RO declined rapidly,and the fouling of RO membrane increased obviously under the condition of high BFR.BFR could reflect the fouling degree of RO well,and could be used as an effective index to predict the trend of RO biofouling.At the same time,the chemical cost only increased by 0.033 yuan/m^3 with little increase in treatment cost,indicating that the technology could be applied to actual production.