Pilot Study on Nanofiltration Combined with Ozonation and GAC for Advanced Drinking Water Treatment

IntroductionThe conventional process for surface water treatment,which consists of flocculation, sedimentation and filtrationcurrently, had been applied inproducingdrinkingwater formany years. Although this process can remove turbidityand bacteria in surface water effectively, only about from20% to 30% of natural organic matter ( NOM) can beeliminated. When the purified water is disinfected bychlorination, these NOMs may react with chlorine. As aresult some dis…     

纳滤膜处理镀铬废水的实验研究

以重金属回收和废水回用为目的，研究了纳滤膜处理镀铬废水。本文讨论了操作压力、膜通量、CrO4^2-离子浓度以及浓缩过程等影响。由实验结果可知，操作压力对CrO4^2-离子的截留率影响较大，而CrO4^2-离子浓度以及浓缩过程的影响较小。在低压和废水浓度较低的情况下，CrO4^2-的截留率可达99％以上，从而实现了镀铬废水分离处理，并达到了回用目的。     

纳滤膜材料及其应用

介绍纳滤膜的特点和制备方法，概述纳滤膜在食品、制药、水处理、染料及冶金行业中的应用，并探讨纳滤膜技术的应用前景。     

纳滤-反渗透技术用于高盐废水中NaCl的回收

为了实现高盐废水中NaCl的回收,采用纳滤-反渗透双膜串级组合工艺,处理NaCl和Na2 SO4的混合模拟废水,考察了浓度配比、操作压力、流速及温度等工艺参数对膜分离效果的影响,并确定出了最佳工艺参数.实验结果表明:在最佳工艺参数下,经纳滤和反渗透分离后的反渗透浓缩液中,[NaCl]/[Na2SO4]≥41.45,可实...     

有机溶剂透过纳滤膜的通量模型研究

在经典通量模型H-P方程的基础上，建立了有机溶剂通过纳滤膜通量(J)的数学模型。通过实验考察了溶剂黏度(μ)、摩尔体积(V_m)和溶解度参数(δ²)对溶剂J的影响，验证了所建模型的准确性和适用范围。结果表明，V_m和δ²是影响有机溶剂纳滤膜J的重要参数。对纯溶剂，该模型能较好的解释其传递规律，与实验有较好的一致性；对混合溶剂，该模型与实验数据的吻合较差，说明混合溶剂J的影响因素较复杂。     

纳滤技术在制药业废碱回收中的应用研究

文中研究一种新型纳滤膜对大孔树脂再生废碱液的过滤纯化作用。工业废碱的碱含量为2％-3％，COD在5000-10000mg／L之间，透光度为10％以下。通过S-357纳滤膜，可回收用于树脂再生的稀碱液。稀碱液的碱含量为2％，COD在400mg／L以下，透光度接近100％。纳虑过滤过程通量稳定，简单的化学清洗可恢复通量。     

双级纳滤中压力条件对苦咸水脱盐淡化的影响

本研究采用双级纳滤技术对苦咸水进行脱盐淡化,探究一级纳滤和二级纳滤不同的压力条件,对纳滤膜通量、钙离子、硫酸根离子、氯离子、总硬度的影响。研究得出,一级纳滤工作压力保持在1.0-1.1MPa,二级纳滤工作压力保持在0.6-0.8MPa,可取得理想的淡化效果。     

Technique for advanced electrochemical oxidation treatment of nanofiltration concentrate of landfill leachate

Landfill leachate treated with combined process of ＂pretreatment ＋biological treatment ＋advanced treatment （NF）＂ to produce nanofiltration concentrate, which bio-chemical ratio （B/C） is less than 0.1 and CODer concentration is 2 000-2 500 mg/L, high salt content. Which cannot be discharged under existing environ- mental standards. According to analysis based on electrochemical advanced oxidation mechanism, a two-step electrochemical tech- nique was recommended. In the first step, a pulse electrochemical technique was adopted. With Fe as consumption electrode and current density of 10 mA/cm2, the pollutants were removed by means of Fenton reaction, electroflotation and electrocoagulation. In the second step, a double function electrode was used to per- form electrocatalytic oxidation by means of titanium metallic oxi- dates. In the condition that current density being 12.5 mA/cm2, the pollutants were further removed by oxidation and electrolytic deposition. Result shows that the removing rate of CODer, NH3-N and CI were 70%-85%, 90% and 25%, respectively; average value of B/C ratio increased from 0.09 to 0.38 and conductivity reduced by 10%.     

CaCl2对葡萄糖纳滤截留率的影响

采用Desal-DK纳滤膜进行中性有机物、CaCl2、葡萄糖/CaCl2混合体系的水溶液纳滤实验与数学模型表征研究。结果表明:CaCl2截留率随本体溶液浓度增大而减小,葡萄糖/CaCl2混合体系中葡萄糖截留率随CaCl2浓度增大而减小。采用道南-立体细孔模型描述CaCl2的截留率变化趋势与实验值吻合良好。实验拟合所得等效孔径、等效膜厚与等效荷电密度随CaCl2浓度增大而增大,表明本体溶液中的CaCl2促使膜孔膨胀。     

膜分离技术的应用

报道膜分离技术用于垃圾渗沥水、6-氨基青霉烷酸（6-APA）裂解液以及维生素C发酵液中的分离浓缩过程,各项实验均进行了中试放大,取得了良好的效果。