渗沥液MBR出水分离浓缩腐殖酸的超滤实验研究

Separation and Thickening of Humic Substances From MBR Effluent of Leachate by Ultrafiltration

针对渗沥液中腐殖酸(HS)浓度高而导致膜生物反应器(MBR)出水难以达标,以渗沥液MBR出水为实验对象,采用超滤技术对其中的HS进行分离浓缩实验。结果表明:浓缩液中总有机碳(TOC)、腐殖酸(HS)浓度均随浓缩倍数(CF)升高而明显增加,HS浓度由218mg/L升高到3665mg/L,TOC由415mg/L升高到3810mg/L,CF为21时HS和TOC的截留率分别为80%和51.6%;浓缩液中固定性溶解固体(FDS)、无机盐离子随CF升高呈小幅增加,CF为21时FDS为10g/L,仅为进料液的1.5倍,FDS的截留率仅为7%,绝大部分无机盐进入透过液;CF为21时,除Co的截留率为90%外,其余重金属的截留率均降到50%以下;HS得到了高效的分离浓缩。

A great amount of humic substances （HS） exist in the leachate which result in the difficulty of leachate dispos-al. Experiments have been made to separate and thicken HS from the effluent of MBR by ultrafiltration. Results showed that the concentrations of HS and TOC in the retentate rose from 218 mg/L to 3 665 mg/L and from 415 mg/L to 3 810 mg/L, re-spectively. HS and TOC both got high rejeation ratio which were 80% and 51.6% respectively when CF was 21. FDS and inor-ganic salt ion rose in a small scale with increasing of CF. When CF was 21, FDS was 10 g/L, only 1.5 times of that in the leachate, rejection ratio of FDS was only 7% which indicated that most of the inorganic salt was in the permeate. The rejection ra-tio of Co was 90% and the other heavy metals＇ rejection ratio were less than 50% when CF was 21. HS could be effectively sep-arated from FDS and heavy metals.