摘要
利用NF-HF和NF-HS纳滤膜对煤化工废水二级反渗透浓水进行处理,重点考察其对Cl^(-)与SO_(4)^(2-)的分离效果、结垢离子的截留率以及膜抗污染性能,并采用STRO(卷式高压反渗透膜)对纳滤产水进行浓缩处理。实验结果表明,与NF-HS相比,NF-HF具有更优的Cl^(-)/SO_(4)^(2-)分离效果及钙、镁、硅离子截留效果和抗污染性能;NF-HF对Cl^(-)截留率为3.38%~6.03%,对SO_(4)^(2-)的截留率为91.18%~97.16%;对钙、镁、硅离子的最大截留率分别为90%、80%和40%;连续运行336 h,NF-HF的运行压力从初始的3.2 MPa升高至4.5 MPa,膜通量降低11%;经碱洗后恢复初始膜通量;STRO浓缩处理NF-HF透过液时表现出良好的浓缩效果和脱除COD效果,但其耐污染性能较差。NF-HF+DTRO(碟式高压反渗透)组合工艺使煤化工废水膜浓缩液进一步分离浓缩具备良好的可行性。
NF-HF and NF-HS nanofiltration membranes were employed to separate SO_(4)^(2-)from Cl^(-)in secondary reverse osmosis concentrate discharged from coal-chemical wastewater treatment plant.The separation of SO_(4)^(2-)from Cl^(-),rejection of scaling ions and anti-fouling performance of the two types membrane were investigated.Spiral Tube Reverse Osmosis(STRO)was used to concentrate permeate of NF-HF.The results showed that NF-HF membrane had better separation Cl^(-)from SO_(4)^(2-)and rejection of scaling ions than NF-HS membrane,whose rejection were 3.38%-16.03%for Cl^(-),91.18%-97.16%for SO_(4)^(2-),90%for Ca 2+,80%for Mg 2+and 40%for SiO 2,respectively.Moreover,NF-HF showed excellent antifouling property.The operating pressure rose slowly from 3.2 MPa to 4.5 MPa after continuously running 336 h and the membrane flux reduced by 11%,which was recovered completely after alkaline washing.STRO could effectively concentrate the NF-HF permeate and reject organic matter,but the anti-fouling performance was poor.Therefore,separating and concentrating coal chemical wastewater with NF-DTRO(Disc Tube Reverse Osmosis)combination process is practicable.
作者
陈发源
田小军
范飞
蒋林煜
王舒东
王樟新
何頔
CHEN Fayuan;TIAN Xiaojun;FAN Fei;JIANG Linyu;WANG Shudong;WANG Zhangxin;HE Di(Institute of Environmental and Ecological Engineering,Guangdong University of Technology,Guangzhou 510006,P.R.China;Beijing Water Business Doctor Co.,Ltd.,Beijing 100029,P.R.China;Xiamen Jiarong Technology Co.,Ltd,Xiamen 361000,Fujian,P.R.China)
出处
《土木与环境工程学报（中英文）》
CSCD
北大核心
2022年第3期126-132,共7页
Journal of Civil and Environmental Engineering
基金
中国博士后基金(2019M662816)
国家自然科学基金(42007314)。
关键词
煤化工高盐废水
纳滤
高压反渗透
工业废水
污水处理
coal-chemical brine
nanofiltration
high-pressure reverse osmosis
industrial wastewater
swage treatment
