Feasibility and simulation model of a pilot scale membrane bioreactor for wastewater treatment and reuse from Chinese traditional medicine

The lack and pollution of water resource make wastewater reuse necessary. The pilot scale long-term tests for submerged membrane bioreactor were conducted to treat the effluents of anaerobic or aerobic treatment process for the high-strength Chinese traditional medicine wastewater. This article was focused on the feasibility of the wastewater treatment and reuse at shorter hydraulic retention time （HRT） of 5.0, 3.2 and 2.13 h. MLSS growth, membrane flux, vacuum values and chemical cleaning periods were also investigated. The experimental results of treating two-phase anaerobic treatment effluent demonstrated that the CODfilt was less than 100 mg/L when the influent COD was between 500-10000 mg/L at HRT of 5.0 h, which could satisfy the normal discharged standard in China. The experimental results to treat cross flow aerobic reactor effluent demonstrated that the average value of CODfilt was 17.28 mg/L when the average value of influent COD was 192.84 mg/L at HRT of 2.13 h during 106 d, which could completely meet the normal standard for water reuse. The maximum MLSS and MLVSS reached 24000 and 14500 mg/L at HRT of 3.2 h respectively. Membrane flux had maximal resume degrees of 94.7% at vacuum value of 0.02 MPa after cleaning. Chemical cleaning periods of membrane module were 150 d. A simulation model of operational parameters was also established based on the theory of back propagation neural network and linear regression of traditional mathematical model. The simulation model showed that the optimum operational parameters were suggested as follows： HRT was 5.0 h, SRT was 100 d, the range of COD loading rate was between 10.664-20.451 kg/（m3.d）, the range of MLSS was between 7543-13694 mg/L.     

有机膨润土对敌敌畏的吸附性能研究

采用批量平衡实验,研究了阳离子表面活性剂十六烷基三甲基溴化铵(CTMAB)改性的有机膨润土及原土对有机磷农药DDVP的吸附性能,并考察了pH、温度以及CaCl<,2>浓度对吸附的影响.结果表明,改性膨润土对水中DDVP的去除能力优于原土,并且吸附量随着改性剂量的增加而增大,即1.0CEC>0.6CEC>0.3CEC>0...     

稀土掺杂钨钼酸盐类荧光粉水热法合成及结构与性能的研究

利用水热法制备了A0.925（MoO4）0.5（WO4）0.5∶Dy03.＋05（A=Ca、Sr、Ba）固溶体微晶。通过X射线衍射（XRD）、扫描电镜（SEM）、荧光分析（FA）等测试手段对微晶结构、形貌和发光性能进行了表征。结果表明A0.925（MoO4）0.5（WO4）0.5∶Dy03＋.05（A=Ca、Sr、Ba）复合钨钼酸盐微晶均呈现典型的四方晶相白钨矿结构。荧光光谱中的480nm处的偶合双峰和575nm处的锐而强的黄发射峰,分别对应于稀土离子Dy3＋的4F9/2→6 H15/2和4F9/2→6 H13/2跃迁。其中具有球状颗粒（尺寸为0.7μm）形貌的Ca0.925（MoO4）0.5（WO4）0.5∶Dy03.＋05微晶的发射峰强度最强,在光学材料中具有潜在应用。     

MBR和CAS工艺污泥在贫营养培养条件下的微生物群落结构研究

采用聚合酶链式-变性梯度凝胶电泳（PCR-DGGE）技术,研究了膜生物反应器（MBR）和传统活性污泥工艺（CAS）反应器中微生物在贫营养条件下的总细菌群落结构.结果表明,在培养过程中,污泥的微生物种群经历了一个比较明显的变化过程,且以CAS污泥微生物种群的变化更为明显,演替过程中既有原始优势种群的消亡,又有新的优势种群...     

Synthesis of polyaluminum chloride with a membrane reactor: Process characteristics and membrane fouling

Polyaluminum chloride was synthesized with a membrane reactor, and the process characteristics, membrane fouling and cleaning were investigated.     

Membrane flux dynamics in the submerged ultrafiltration hybrid treatment process during particle and natural organic matter removal

Exponential relationship was developed to quantify the normalized membrane flux dynamics during the filtration period and fitted the results well.     

两级序批式MBR与单级好氧MBR对比试验研究

针对MBR在应用中存在的脱氮除磷效率低、膜污染严重等问题,提出两级序批式MBR工艺,并与单级好氧MBR进行了对比试验研究.结果表明,两级序批式MBR不但具有SBR脱氮除磷的优势,而且解决了单泥工艺存在的脱氮除磷矛盾问题,在稳定运行阶段,膜出水NH;-N、TN、TP平均值分别为2.83 ms/L、12.20 mg/L、0...     

农业土壤中水溶性氟的分布特征与影响因素分析——以湖北省荆州市为例

土壤中氟是人体必需元素,但过量的氟摄入影响人体健康。本研究以湖北省荆州地区为例,通过该地区典型利用方式和土壤类型共177个代表性样点取样分析,摸清了该地区农业土壤水溶性氟含量状况,探讨了土壤基本理化性质与土壤水溶性氟含量的关系。结果表明,该区域土壤水溶性氟在0.22 mg/kg~4.57 mg/kg之间,平均值为1.74 mg/kg,变异系数高达50%。潮土中水溶性氟含量最高(1.86 mg/kg),其次是水稻土(1.76 mg/kg),棕红壤(0.55 mg/kg)水溶性氟含量最低。土壤水溶性氟含量在pH值低于7.5时与土壤pH值呈极显著正相关关系。旱地与草地土壤的水溶性氟含量随着有机质的增加而显著增加,但水稻土有机质含量与土壤水溶性氟含量无明显相关性,表明研究区内土壤高氟含量的形成与当地的母质主要为冲积母质有直接关系。     

陶瓷膜组合工艺对水中甲硫醚去除效果研究

采用顶空-固相微萃取和色谱质谱联用仪器方法调查严重污染的河流、相关水源中甲硫醚嗅味物质的分布.结果表明,河流中甲硫醚浓度高达2 907 ng/L,受污染的相关水源中甲硫醚浓度达到53 ng/L.单独陶瓷无机膜工艺对DMS去除的效果为20％左右,而臭氧氧化则具有较好的效果,臭氧-陶瓷膜组合工艺对DMS去除率达到50％～9...     

投加氢氧化铁对SMBR中活性污泥性能的影响

试验研究了在SMBR中投加不同量氢氧化铁对出水水质以及膜污染的影响。结果表明,生物铁-SMBR中随氢氧化铁投加量的增加,COD出水及去除率略有提高;氢氧化铁投加量为5%时,对活性污泥的活性促进作用最强;活性污泥SVI的降低主要是氢氧化铁絮体本身的化学絮凝作用所致;试验条件下氢氧化铁最佳投加量为混合液污泥浓度的5%时,半透膜压增长最慢,膜污染程度最轻。