KOH/甲醇溶液中Pb电极上电化学还原CO2

化学转化CO2为更有价值的物质对于缓解大气中的温室气体极为重要.以Pb片为工作电极,石墨电极为对电极,银-氯化银电极为参比电极,研究了0.1 mol(L(1 KOH/甲醇电解液中电化学还原CO2的行为.结果表明,在所考察的范围内,常压下CO和甲酸生成的法拉第效率在258 K时最大,分别为9.62%和78.74%,常温加压条件下,CO2压力为1.2 MPa时CO和甲酸生成的法拉第效率最大,分别为13.93%和24.00%.进一步进行电极反应的动力学研究,得CO2电化学还原生成CO和甲酸的反应级数分别为0.573和0.671.     

臭氧-水解酸化-厌氧-两级A/O工艺处理化工废水

采用臭氧-水解酸化-厌氧-两级A/O组合工艺处理高浓度化工废水,介绍了废水处理系统的组成,主要构筑物的设计参数及设备配置。运行结果表明,该工艺对化工废水具有良好的去除效果,系统对COD和TP的总去除率可达到95%以上,生物处理对NH3-N的去除率65%,出水水质满足当地污水处理厂的纳管要求。     

ZnAl类水滑石制备温度对吸附剩余污泥脱水液中磷酸根的影响

A group of Zn-Al layered double hydroxides (LDHs) were synthesized at different temperatures from 25–90 °C in order to investigate the influence of synthesis temperature on characteristics of the LDHs and their phosphate adsorption behaviour. The results reveal that an increase in the synthesis temperature generally improves the specific surface area of the sample and the phos-phate adsorption capacity. The significantly enhanced crystallinity of the Zn-Al-30, synthesized at 30 °C, leads to a remarkable de-crease in the specific surface area and consequently a poor phosphate adsorption capacity. It is suggested that the surface adsorption plays an important role in the phosphate uptake by the Zn-Al LDHs. Zn-Al-70 presents a relatively higher crystallinity and a lower specific surface area, compared with Zn-Al-60 and Zn-Al-80, but the highest phosphate adsorption capacity, indicating that surface adsorption is only one of the pathways for phosphate removal. The phosphate adsorption by the Zn-Al follows a pseudo-second-order kinetic equation. The adsorption isotherms fit Langmuir models, and the maximum adsorption capacities of the Zn-Al-25, Zn-Al-50 and Zn-Al-70 are estimated to be 17.82, 21.01 and 27.10 mg•g1 adsorbent, respectively.     

有机硫恶臭废气净化技术的新进展

有机硫恶臭废气嗅阈值低、毒性大,是工业有机废气处理领域的难点。本文重点介绍了吸附法、低温等离子体法、生物法等技术用于有机硫恶臭废气净化的最新进展。并对现存的问题进行了分析,提出了建议。     

微电解/混凝/臭氧氧化强化生物工艺处理制药废水

针对高浓度制药废水成分复杂、可生化性较差等特点,采用铁碳微电解/混凝/臭氧氧化工艺作为预处理工艺,再与生物处理工艺联用进行处理。介绍了各处理构筑物的设计参数及设备配置情况,并对实际运行效果进行了分析。结果表明,铁碳微电解/混凝/臭氧氧化预处理可去除50%以上的COD,有效降低了后续生物处理工艺的有机负荷。整个处理系统运行稳定,COD总去除率95%,出水水质满足当地污水处理厂的纳管要求。     

Kinetics of CO2 reduction in KOH/methanol electrolyte on Pb electrode

As natural oil reserves become depleted, attentionwill increasingly focus on alternative energy sources.The energy and raw materials for this are currently de-rived from the burning of coal, with the accompanyingrelease of CO2as a by-product[1]. CO2causes…     

甲硫醚降解菌JLM-8的分离鉴定与降解条件优化

从制药厂的活性污泥中分离到一株能以唯一碳源和硫源降解甲硫醚的菌株JLM-8,经过生理生化测试与16S rDNA系统发育树分析鉴定为嗜麦芽寡养单胞菌(Stenotrophomonas maltophilia)。通过测定菌株的生长量、甲硫醚的降解率,利用响应面法优化最佳降解条件,并测定了该菌降解甲硫醚的动力学参数。结果表明:当接种量为25 mg·L^-1时,通过响应面法优化的最佳降解条件为温度31.3℃、pH 7.5,初始甲硫醚浓度50 mg·L^-1时最大预测降解率为98.2%,实验验证降解率为97.9%。菌株降解动力学参数最大比降解速率、半饱和系数、抑制系数分别为2.37 h^-1、143.55 mg·L^-1、51.35 mg·L^-1,临界抑制浓度为78.46 mg·L^-1。     

MBBR—MBR组合工艺处理生活垃圾沥滤液的研究

室温下,采用缺氧/两级好氧MBBR—MBR组合工艺对厌氧处理后的垃圾焚烧厂沥滤液进行处理。实验结果表明:在进水pH约为7、进水流量1.0 L/d和总回流比400%的条件下,即使沥滤液的NH4+-N高约1 650 mg/L、COD约为6 500 mg/L时,组合工艺对COD、NH4+-N、TN的去除率仍达到80%、99%、81%左右,出水NH4+-N<15mg/L,该工艺能实现对高浓度NH4+-N的有效去除。另外,二级好氧MBBR和MBR中的亚硝氮积累率分别达到90%、80%左右。这两个反应器中亚硝酸菌的数量远多于硝酸菌。