Enhanced U(VI) bioreduction by alginate-immobilized uranium-reducing bacteria in the presence of carbon nanotubes and anthraquinone-2,6-disulfonate

Uranium-reducing bacteria were immobilized with sodium alginate, anthraquinone-2, 6-disulfonate (AQDS), and carbon nanotubes (CNTs). The effects of different AQDS-CNTs contents, U(IV) concentrations, and metal ions on U(IV) reduction by immobilized beads were examined. Over 97.5% U(VI) (20 mg/L) was removed in 8 hr when the beads were added to 0.7% AQDS-CNTs, which was higher than that without AQDS-CNTs. This result may be attributed to the enhanced electron transfer by AQDS and CNTs. The reduction of U(VI) occurred at initial U(VI) concentrations of 10 to 100 mg/L and increased with increasing AQDS-CNT content from 0.1% to 1%. The presence of Fe(III), Cu(II) and Mn(II) slightly increased U(VI) reduction, whereas Cr(VI), Ni(II), Pb(II), and Zn(II) significantly inhibited U(VI) reduction. After eight successive incubation-washing cycles or 8 hr of retention time (HRT) for 48 hr of continuous operation, the removal efficiency of uranium was above 90% and 92%, respectively. The results indicate that the AQDS-CNT/AL/cell beads are suitable for the treatment of uranium-containing wastewaters.     

Mg/Al双金属氧化物对As(V)吸附性能的研究

研究了以镁铝水滑石为原料制备的Mg/Al双金属氧化物对溶液中As(V)的吸附作用及其影响因素.结果表明：Mg/Al双金属氧化物对As(V)具有较强的吸附能力,吸附规律符合Langmuir等温吸附方程,根据计算所得的理论最大吸附量为51.02 mg·g-1,与实验得出的最大吸附量50.53 mg·g-1基本一致;运用3种...     

煤矿工业废水处理工艺技术及效益分析

我国煤炭资源十分丰富,开采过程中产生大量废水,为了减少煤矿废水治理的投资及运行费用,详尽阐述了实用、可行、高效的处理技术及工艺组合,并在煤矿废水处理中取得良好的处理效果,分析得出煤矿废水经深度处理回用后具有良好经济、环境效益。     

钢铁企业节水评价指标体系的构建

针对中国钢铁行业尚未建立节水评价指标体系的现状,在广泛查阅资料的基础上,遵循科学合理性、目标导向性、实用性和可比性的原则,构建了钢铁企业节水评价指标体系。指标体系的建立使钢铁企业的节水成效具有横向和纵向可比性,有利于调动企业的节水积极性,促进节水技术的发展和推广,为钢铁企业开展节水工作指明目标和方向。     

Joint effects of Penta-BDE and heavy metals on Daphnia magna survival, its antioxidant enzyme activities and lipid peroxidation

The joint toxicity of Penta-BDE (Pe-BDE) and heavy metals including cadmium and copper on Daphnia magna (D. magna) was evaluated on the basis of determining the 48 h survival, antioxidative enzyme responses, and lipid peroxidation. The response was classified as additive, greater than additive, or less than additive by comparing the measured “toxic units, TU” with one. Based on the survival of D. magna, less-than-additive interactions were found in most of mixtures treatments. This may be attributed to the different toxicity mechanism between Pe-BDE and metals. Cu and Cd played a greater role in toxicity than what Pe-BDE did. As for the superoxide dismutase (SOD) and catalase (CAT) activity, most response was less than additive. For the glutathione S-transferases (GST) activity, most of the greater-thanadditive responses were found in the Cu plus Pe-BDE treatments, but the additive responses occurred in Cd plus Pe-BDE treatments and binary metal treatments. For lipid peroxide levels, which were measured as malondialdehyde (MDA) levels, less-than-additive response occurred in the 50% Cd plus 50% Cu and ternary mixture treatments. Results suggested that Pe-BDE, Cd, and Cu could induce different patterns of antioxidant enzyme responses, such as antioxidant/prooxidant responses, depending on their capability to produce reactive oxygen species and antioxidant enzymes to detoxify them.     

铝盐最佳混凝形态及最佳pH范围研究

本文从理论上分析了铝盐的水解聚合过程,预测了铝盐混凝过程进行时的最佳混凝形态及最佳ｐＨ范围,并且通过实验手段分析说明了铝盐的最佳混凝形态,混凝特征及最佳ｐＨ范围,得到了较为一致的结果。     

几种天然矿物去除苯酚效果及日光光解效应评价

本文以四种天然矿物为受试矿物,评价了它们去除苯酚的效果,以及日光光解放应及温度,ＰＨ值,矿物浓度,苯酚初始浓度对去除效果的影响。     

液相吸收-高效液相色谱法测量气相OH方法的建立

利用水杨酸溶液相OH自由基,生成的荧光产物2,5－二羟苯甲酸用高效液相色谱法分离测定,推算得到气相OH浓度,根据此原理在实验室条件下,建立了气相OH自由基的测定方法,并利用气相OH标准发生源确定了最优实验条件,得到了气相OH浓度与荣光响应关系。由相吸收－高效液相色谱法测定的浓度与标准OH气流中的理论浓度比较一致。     

污水土地处理CAD系统设计

针对污水土地处理设计实际,以提高设计速度和质量为目标,结合计算机辅助设计技术和软件技术的发展,采用成熟而先进的参数化设计技术及ADS开发工具,对土地处理设计中的几个关系问题进行了探讨。     

用含固定化微生物的曝气生物滤池处理炼油厂高浓度废水

采用含固定化微生物的曝气生物滤池(G-BAF)处理炼油厂高浓度废水。当G-BAF池进水COD为298～11 278 mg/L时,出水COD为33.0～94.3 mg/L,COD平均去除率为97%;当G-BAF池进水ρ(NH_3-N)为12.1～188.0 mg/L时,出水ρ(NH_3-N)为0.9～49.4 mg/L,NH_3-N平均去除率为83%。经G-BAF处理后出水水质完全达到GB8978—1996《污水综合排放标准》第二类污染物的二级排放标准。