The Novel MMR’s Application In The Zn²⁺/phenol Complex Wastewater Treatment And The Preliminary Discussion On Membrane Fouling

The heavy metal/organic composite wastewater is one of the forms of damageto the environment, it is also listed in national water projects. Due to strong toxicityand large harm,traditional physicochemical method is limited, therefore a moreinnovative and effective method is needed. Membrane Bioreactor can effectively treatthe kind of wastewater, but Membrane fouling is one of the important factors affectthe processing efficiency. it is related to the hydraulic conditions of reactor, theproperties of sludge,the quality and concentration of the pollutants and soon.Therefore, this article build novel electrical-oxygen and seperated membranebioreactor,and uses Zn²⁺/phenol complex pollution in wastewater as the researchobject.on the basic study of the activated sludge, magnetic sawdust and magneticsawdust after hanging membrane to the target efficiency of wastewatertreatment,further research on the preliminary discussion on membrane fouling underdifferent HRT, sludge concentration, treatment time, exposure volume, currentintensity, MBR is applicatied in the Zn²⁺/Phenol complex wastewater treatment.Obtain the following conclusion:（1） The seperated MBR has improved in membrane fouling than integratedMBR.namely under the MLSS=3260mg/L, HRT=12h, I=40mA conditions,within20day the membrane water flux is from1L/h to0.64L/h in the seperated MBR,whichfell by36%,while integrated MBR from1L/h to0.05L/h, and severe pollution.（2） According to the content of extracellular polymers EPS and TOC in the filtratewas positively correlation, we can measure TOC to represent EPS content.namelyunder the cases of MLSS=3260mg/L, HRT=12h, I=40mA,8-20days the seperatedMBR membrane on the TOC concentration is17.69mg/L which16times higher than0-8days, while integrated membrane on the TOC content is67.16mg/L increased1.3times. The integrated MBR is severer than the seperated MBR in the pollution ofmembrane,and EPS content which rise from8to20day is the reason of themembrane flux decline.（3） SEM images in the seperated MBR shows that:within0-20days, when MBR runsto the8th day, it produces some bacillus and staph, in the11th dayare changed intofilamentous bacteria dominated adhesion formation plugging in the membrane hole,running to the20th day large spherical bacteria and bacillus were deposited onmembrane, and causes serious membrane fouling. （4） When disposing the50mg/L phenol,100mg/L Zn²⁺of the wastewater. Within12hfor the concentration of50mg/L phenol can achieve84.59%is higher65%thanmagnetic sawdust; For the concentration of100mg/L with Zn²⁺waste sawdustmagnetic effect is better than activated sludge, its removal rate can reach96.6%in18h,8%higher than sludge.（5） For the100mg/L Zn²⁺,50mg/L phenol to target wastewater, under the MLSS=3260mg/l, HRT=12h, I=40mA and added magnetic sawdust conditions.Phenoldegradation rate can reach more than90%, while the average degradation rate of Zn²⁺is only65.12%in novel electrical-oxygen and seperated membrane bioreactor.