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.568. 北京科技大学学报 第29卷 Treatment of antibiotic wastewater with hydrolytic acidification membrane bioreac- tor HAN Jianhong,SUN Jingmin2.3).REN Liren 1)Energy and Environment School,Inner Mongolia University of Science and Technology Baotou 014010.China 2)Municipal and Environmental Engineering School.Harbin Institute of Technology,Harbin 150090,China 3)National Environmental Protection Engineering Technical Center of Pharmaceutical Wastewater Pollution Control.Shijiazhuang 050051,China ABSTRACI According to the characteristic of antibiotic wastew ater,industrial experiment was carried out by hydrolytic acidification membrane bioreactor(MBR)process.The MBR's running parameters and treatment ef- fect were systematically investigated during the treatment.The results show that when the volume loading of the MBR is 7-10kg'm3d,the removal rates of COD.NH-N and TN are up to 90%80%and 65%,re- spectively.The water quality of the effluent can meet the secondary discharge standard of the GB18918-2002 Integrated Wastewater Discharge Standard of China. KEY WORDS wastew ater treatment:antibiotic wastew ater;membrane bioreactor;volume loading:hydrolytic acidification (上接第564页) Recovery of magnesium ammonium phosphate from ammonia nitrogen wastewater by chemical precipitation ZOU Anhua,SUN Tichang,SONG Cunyi,XING Yi,GUO Suhong Civil and Environmental Engineering School.University of Science and Technology Beijing.Beijing 100083.China ABSTRACT Batch experiments of magnesium ammonium phosphate(MAP)precipitation were conducted to examine the optimal conditions for recovering MAP from simulated NH4-N wastewater.The experimental re- sults indicated that the precipitates consisted mainly of MAP when the pH was maintained between 8.0 and 11.0.The precipitates,produced at pH 10 and the molar ratio of n(NH)(Mg+):n(PO)was 1:1.4: 1,were pure MAP,3.14g MAP was attained from 1L simulated wastewater and the removal rate of NHiN could reach 91.5.It is shown that the application of chemical precipitation method can be promoted for the cost of it could be considerably decreased by recovering MAP. KEY WORDS wastewater treatment;ammonia nitrogen wastew ater;magnesium ammonium phosphate: chemical precipitation:XRDTreatment of antibiotic wastewater with hydrolytic acidification membrane bioreactor HA N Jianhong 1）SUN Jingmin 23）REN L iren 3） 1） Energy and Environment SchoolInner Mongolia University of Science and TechnologyBaotou014010China 2） Municipal and Environmental Engineering SchoolHarbin Institute of TechnologyHarbin150090China 3） National Environmental Protection Engineering Technical Center of Pharmaceutical Wastewater Pollution ControlShijiazhuang050051China ABSTRACT According to the characteristic of antibiotic wastewaterindustrial experiment was carried out by hydrolytic acidification membrane bioreactor （MBR） process．The MBR’s running parameters and treatment effect were systematically investigated during the treatment．The results show that when the volume loading of the MBR is7－10kg·m －3·d －1the removal rates of CODNH4－N and TN are up to90％80％ and65％respectively．The water quality of the effluent can meet the secondary discharge standard of the GB18918－2002 Integrated Wastewater Discharge Standard of China． KEY WORDS wastewater treatment；antibiotic wastewater；membrane bioreactor；volume loading；hydrolytic acidification （上接第564页） Recovery of magnesium ammonium phosphate from ammonia nitrogen wastewater by chemical precipitation ZOU A nhuaSUN TichangSONG CunyiXING Y iGUO Suhong Civil and Environmental Engineering SchoolUniversity of Science and Technology BeijingBeijing100083China ABSTRACT Batch experiments of magnesium ammonium phosphate （MAP） precipitation were conducted to examine the optimal conditions for recovering MAP from simulated NH ＋ 4 －N wastewater．The experimental results indicated that the precipitates consisted mainly of MAP when the pH was maintained between 8∙0and 11∙0．The precipitatesproduced at pH10and the molar ratio of n（NH ＋ 4 ）∶n（Mg 2＋）∶n（PO 3－ 4 ） was1∶1∙4∶ 1were pure MAP3∙14g MAP was attained from1L simulated wastewater and the removal rate of NH ＋ 4 －N could reach91∙5％．It is shown that the application of chemical precipitation method can be promoted for the cost of it could be considerably decreased by recovering MAP． KEY WORDS wastewater treatment；ammonia-nitrogen wastewater；magnesium ammonium phosphate； chemical precipitation；XRD ·568· 北 京 科 技 大 学 学 报 第29卷