Preparation of PFS coagulant by sectionalized reactor

The oxidation rate of ferrous sulfate is investigated for the preparation of polyferric sulfate(PFS)coagulant.In is proved that this reaction is zero order with respect to Fe^2 ,first order with respect to NO2(g),and first order with respect to the interface area between gas phase and liquid phase.According to this mechanism,sectionalized reactor(SR) is used in place of traditional reactor(TR),and the liquid of reaction mixture is recycled by pump.As a result,not only the flow path of reaction liquid is prolonged,but also gas-liquid contact area enlarged,and the reaction distinctly accelerated,compared with traditional reactor.The effects of parameters including temperature,acidity and others on the reaction rate are also discussed.     

Acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration methanol Wastewater

In this study, the two-stage upflow anaerobic sludge blanket (UASB) system and batch experiments were employed to evaluate the performance of anaerobic digestion for the treatment of high concentration methanol wastewater. The acid resistance of granular sludge and methanogenic bacteria and their metabolizing activity were investigated. The results show that the pH of the first UASB changed from 4.9 to 5.8 and 5.5 to 6.2 for the second reactor. Apparently, these were not the advisable pH levels that common methanogenic bacteria could accept. The methanogenic bacteria of the system, viz. Methanosarcina barkeri, had some acid resistance and could still degrade methanol at pH 5.0. If the methanogenic bacteria were trained further, their acid resistance would be improved somewhat. Granular sludge of the system could protect the methanogenic bacteria within its body against the impact of the acidic environment and make them degrade methanol at pH 4.5. The performance of granular sludge was attributed to its structure, bacteria species, and the distribution of bacterium inside the granule. Translated from Acta Scientiae Circumstantiae, 2004, 24(4): 633–636 [译自: 环境科学学报]     

化学降阻剂在山地环境中的应用研究

把山地环境划分为4种类型,并对各自的特点进行了分析.从导电机理和降阻机理两个方面分析了化学降阻剂的降阻功能,根据不同地质条件讨论了化学降阻剂的合理选择,并对化学降阻剂的应用方法和技术进行了研究,为山区防雷提供一定的参考价值.     

硫铁矿生物法制酸及其应用研究

用细菌氧化硫铁矿产酸，然后用该酸性水去中和燃煤电厂碱性灰水。在实验室内研究了初始ｐＨ、温度及硫铁矿的投加量等因素对产酸速度的影响；试验表明：用该酸性水处理高ｐＨ、高悬浮物（ＳＳ）含量的灰水，可以达到排放或回用要求，且成本较低。     

脉冲等离子法烟气脱硫的放大实验

锅炉烟气进行脉冲等离子法脱硫的扩大实验，得到与模拟烟气实验相近的结果。研究表明，脉冲等离子法对锅炉烟气中的ＳＯ２去除率可达９５％以上，烟气在反应器内的停留时间（ｔｓ）、脉冲电源的放电功率（Ｐ）和添加ＮＨ３等条件，对脱硫效率９η）有较大影响。ｔｓ、Ｐ越大、η越高。处理烟气量（Ｑ）、能耗（Ｐ）与η存在函数关系：η＝１１８．０（Ｐ／Ｑ）＾０．１１１１。烟气中加入适量ＮＨ３，对脱硫效率有显著提高，以ＮＨ３     

太湖水中降解苯酚细菌的分布与降解能力研究

太湖水中降解苯酚的细菌有3个属，分别是假单胞菌属、微球菌属和芽孢杆菌属。芽孢杆菌属和假单胞菌属是降解苯酚的主要细菌。未驯化细菌对1mg/L苯酚的降解率介于70％～85％。驯化细菌对苯酚的降解能力有了很大提高，对60mg／L苯酚的降解率达到了60％，86％。CS1培养基适宜测试未驯化细菌对苯酚的降解能力，测试驯化细菌则要用CS2培养基。     

厌氧酸化-二级PSB流化床工艺处理高浓度有机废水

采用厌氧酸化+二级光合细菌(PSB)流化床的组合工艺对植物压榨发酵废水进行降解实验,一级流化床(PSB1)中填料为轻质多孔炭渣,二级流化床(PSB2)为活性炭,扰动方式分别采用机械流化和机械气动组合流化,稳定运行40d。结果表明,进水酸化12h后CODCr由80000~120000mg/L降至63000~95000mg/L,进而由系统出水回流稀释至8000~12000mg/L,进入二级流化床反应器,PSB1白天厌氧光照、夜间微好氧,PSB2白天微好氧、夜间好氧,停留48h,CODCr降至295.8~384mg/L,稳定实现96.2%以上的CODCr去除率,TN去除率为71.3%。     

活性污泥生长的控制

在污水处理过程中，针对不同的运行环境，我们选择适当的运行工艺和参数。通过控制菌胶团细菌和丝状菌平衡生长，或者是使固着型原生动物占优势，来获得良好的活性污泥，保证出水达标排放。     

聚合硫酸铁和聚合硫酸铝的配伍和性能研究

将聚合硫酸铁 (PFS)与聚合硫酸铝 (PAS)按一定比例混合 ,即可制得一类具有不同铝铁含量的新型净水剂——聚合硫酸铁铝 (PFAS)混合液 ,分析、检测了几种 PFAS的性质及其净水性能。结果表明 ,PFAS的综合性能优于 PFS和PAS,更能适应原水水质的变化 ,其中尤以铝铁分子摩尔比为 0 .64的 PFAS性能最优。