Chemical Industry and Engineering Progree

• 资源与环境工程 • Previous Articles     Next Articles

Effect of dissolved oxygen on DMBR treatment efficiency and characteristics of membrane fouling

HONG Junming,YIN Juan   

  1. College of Chemical engineering,Huaqiao University,Xiamen 361021,Fujian,China
  • Online:2011-05-05 Published:2011-05-05

溶解氧对动态膜生物反应器的处理效果及膜污染特性

洪俊明,尹 娟   

  1. 华侨大学化工学院,福建 厦门 361021

Abstract:

Polyester filter cloth with mean pore size of 37 μm was used as the separation medium to develop a submerged dynamic membrane bioreactorDMBRfor treating model household wastewater. The treatment efficiency and extracellular polymeric substancesEPSwere investigated at different dissolved oxygenDOconcentrationsthe characteristics of membrane fouling were dicussed. The results showed that when the concentration of DO was more than 0.5 mg/Lthe concentration of effluent COD was stable at 16.67 mg/L. The concentration of DO had a significant effect on the effluent of ammonia nitrogennitrate and total nitrogen. When the concentration of DO was 3.03.5 mg/Lthe effluent concentration of ammonia nitrogen was the lowestand the removal of total nitrogen was the maximum. When the concentration of DO was more than 2.0 mg/Lthe concentration of EPS was almost unchanged. Under such circumstancesthe concentration of EPS was 20 mg/g MLSSand the polysaccharide concentration was more than the protein concentration in the DMBR. The resistance values of cloth and dynamic membrane was 2×106 m1 and 4.32×107 m1respectively. The latter was the main resistance in the DMBR. At a constant influent flow of 3.0 L/hthe flux of the dynamic membrane could reach 25 L/(m2·h)with its backwashing period of about 33d and 100% recovery of the membrane flux.

摘要:

采用孔径为37 μm涤纶滤布作为分离介质构成一体式动态膜生物反应器(DMBR)处理模拟生活污水,考察溶解氧(DO)对反应器处理效果和胞外聚合物(EPS)的影响,并研究了膜污染的特性。结果表明,当DO0.5 mg/L时,溶解氧对COD的去除效果影响不大,出水COD浓度为16.67 mg/L;氨氮、硝氮和总氮的浓度受DO影响较大,DO浓度在3.03.5 mg/L时,出水氨氮浓度最低,总氮的去除效果最好。当DO2.0 mg/L时,EPS浓度不受DO的影响,反应器中EPS浓度在20 mg/gMLSS,并且多糖浓度大于蛋白质浓度。在DMBR工艺中,滤布本身的阻力为106 m1,动态膜形成的阻力为4.32×107 m1,后者是总膜阻力的主要决定因素。在进水流量为3.0 L/h时,反应器膜通量为25 L/(m2·h),反冲洗周期为33 d,反冲洗后膜通量恢复率为100%

京ICP备12046843号-2;京公网安备 11010102001994号
Copyright © Chemical Industry and Engineering Progress, All Rights Reserved.
E-mail: hgjz@cip.com.cn
Powered by Beijing Magtech Co. Ltd