膜孔径对沼液超滤浓缩过程养分和污染物富集的调控作用  

Regulation of membrane pore size to nutrient and pollutant enrichment during ultrafiltration concentration of biogas slurry

作　　者：王永芳 崔文静[2] 刘婉岑 夏若涵 曹丁戈 丁相瑞 李国学 罗文海[1,3,4] WANG Yongfang;CUI Wenjing;LIU Wancen;XIA Ruohan;CAO Dingge;DING Xiangrui;LI Guoxue;LUO Wenhai(Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation,College of Resources and Environment,China Agricultural University,Beijing 100193,China;Qingdao Agricultural University,College of Resources and Environment,Qingdao 266109,China;Organic Recycling Research Institute(Suzhou)of China Agricultural University,Suzhou 215100,China;Key Laboratory of Low-carbon Green Agriculture,Ministry of Agriculture and Rural Affairs,Beijing 100193,China)

机构地区：[1]中国农业大学资源与环境学院,农田土壤污染防控与修复北京市重点实验室,北京100193 [2]青岛农业大学资源与环境学院,青岛266109 [3]中国农业大学有机循环研究院(苏州),苏州215100 [4]农业农村部农业绿色低碳重点实验室,北京100193

出　　处：《农业环境科学学报》2023年第11期2570-2581,共12页Journal of Agro-Environment Science

基　　金：中国科学技术协会青年人才托举工程项目(YESS20200124);中央高校基本科研业务费专项资金项目(2022TC168)。

摘　　要：为确定适用于沼液浓缩的低污染高截留超滤(UF)膜孔径,选取鸡粪沼液为浓缩对象,采用膜孔径为500、100、50、30 KD的UF膜(平均膜孔径分别为20、6、4 nm和3 nm)进行浓缩处理,考察不同孔径UF膜对沼液浓缩过程中养分和风险污染物迁移的调控作用。结果表明:不同孔径UF膜的水通量均呈现快速降低-平稳-再降低的三段式现象,整体降低38%~49%,且低孔径膜下降更为明显。不同孔径UF膜对沼液中有机质的截留效果整体差异不显著,对TP、TN、TK等养分的截留率随孔径缩小而逐渐提高。同时,不同孔径UF膜对Ca、Mg、Fe和Zn 4种中微量元素的截留性能相似,对重金属和抗生素的截留性能也随孔径的缩小而逐步提升,对Cu和Pb的截留率均可达到100%。综合稳定水通量、养分截留和风险污染物富集,确定适用于沼液浓缩的UF膜孔径为100 KD。To determine an ultrafiltration(UF)membrane with a suitable pore size to exhibit low fouling propensity and high contaminant retention,UF membranes with membrane pore sizes of 500,100,50 KD,and 30 KD(average membrane pore sizes of 20,6,4 nm,and 3 nm,respectively)were selected for the concentration of chicken manure biogas slurry.The results showed that water flux was reduced by 38%–49%with three notable stages:rapid decrease,stabilization,and further decrease.Such a flux reduction was more notable for the UF membrane with low pore size.Although the effects of UF membrane pore size on the retention of organic matter in biogas slurry were insignificant,nutrients,such as total phosporous,total nitrogen,and total potassium,were more effectively rejected with a gradual decline in membrane pore size.Similarly,the four UF membranes exhibited similar retention for medium and trace elements,including Ca,Mg,Fe,and Zn.Nevertheless,the retention of heavy metals and antibiotics by the UF membrane increased in response to reduced pore sizes.In particular,Cu and Pb were almost entirely retained by the four UF membranes.Based on the stable water flux,nutrient retention,and contaminant enrichment,the membrane pore size of 100 KD was preferable for the concentration of biogas slurry.

关 键 词：超滤 沼液 膜孔径 膜浓缩 养分 风险污染物 

分 类 号：X713[环境科学与工程—环境工程]