Transformation and performance of granular sequence batch reactor under conventional organic loading rate condition

Laboratory experiments were conducted to investigate the transformation and performance of a granular sequence batch reactor（SBR） under the conventional organic loading rate（OLR） condition.Aerobic granules were successfully cultivated in a SBR by means of alternative feeding load combined with reducing settling time after 60 d operational period.Subsequently,the black fungal granules were presented in reactor because of the filamentous overgrowth on the surface of aerobic granules.A small amount of fungal granules had no effect on the performance of granular SBR.Aerobic granules completely vanished and fungal granules eventually became the dominant species in subsequent 90 d operation after granulation.The three-dimensional excitation emission matrix（EEM） spectra result shows that the extracellular polymeric substances（EPS） component in both granules has no much difference,whereas the content of EPS in fungal granules is higher than that in bacterial granules.Due to their low bioactivity,the chemical oxidation demand（COD） and NH4-N removal efficiencies gradually decrease from 90.4%–96.5% and 99.5% to 71.8% and 32.9% respectively while the fungal granules become dominant in the SBR.     

厌氧消化联合工艺去除养殖废水中TRGs的探究

有效去除奶牛养殖废水中四环素类抗性基因（Tetracycline antibiotic resistancegenes,TRGs），有助于进一步控制抗生素抗性在环境中的传播扩散。采用厌氧消化-超声-吸附联合处理工艺，分析其对奶牛养殖废水中TRGs的去除效率。结果表明，经厌氧消化后，奶牛养殖废水中的tet Q和tet G的绝对丰度上升，tet C、tet O、tet T和tet X的绝对丰度下降，总TRGs绝对丰度降低28.61%。超声处理可有效降低消化液中TRGs的丰度，且胞外TRGs(extracellular TRGs,eTRGs)的丰度占比增高；其中，在声能密度为1.5 W/mL和时间为40 min的超声条件下，对TRGs的去除率达到最大为83.29%。生物炭吸附处理能有效去除超声处理液中的TRGs和eTRGs，去除率分别为45.29%和71.09%。厌氧消化-超声-吸附联合处理工艺对奶牛养殖废水中TRGs的总去除率可达99.32%，表明此联合处理工艺能较大程度去除奶牛养殖废水中的TRGs，有效降低其向周边环境传播扩散的风险。     

EF-Feox法处理苯酚模拟废水

用EF-Feox法氧化处理苯酚模拟废水.讨论了处理过程中各因素对去除率的影响。实验结果显示:在槽电压为3V,H_2O_2投加量为4.5m L/L,起始p H为5,温度35℃下,经过60min后苯酚去除率可达90%。     

水洗钼酸铵生产线各工序钾含量的分析探讨

文章通过对水洗钼酸铵生产线各工序钾含量的分析探讨,得到各工序钾的去除率和变化规律,并根据二钼酸铵产品中的钾含量推算出各工序钾的限制浓度,对生产工艺过程具有一定的监测和指导作用。实际生产中,可根据不同产品中的钾含量要求,对各生产工序中的钾进行有效控制。     

Fenton+SMBBR组合工艺对有机废水的中试研究

采用Fenton+SMBBR组合工艺处理池州市某化工厂污水站的难降解有机废水。结果表明,在25～28℃时,H_2O_2浓度400 mg/L,污泥浓度4 000 mg/L,水力停留时间5 d时,COD、NH~+_4-N、TN的去除率分别达到96.5%,92.7%,89.2%。出水优于国家一级A排放标准。