双极铝电极电凝聚除氟研究

一种投资不大的脱氟方法——双极铝电极电凝聚脱氟法,用模拟水样研究电极间距、氟化物浓度、温度以及溶液的ｐＨ值对电凝聚的影响,并对其优化条件进行了探讨。同时,用南阿尔及利亚水样讨论了电流密度和面积／体积比率对脱氟作用的影响。研究表明：用双极铝电极电凝聚法去除撒哈拉水中的氟化物不需加可溶性盐。铝与氟化物的质量比为１７：１。     

梅家州形成、演化及其对鄱阳湖的影响

根据鄱阳湖口梅家洲东南缘钻孔（ZK2）沉积物环境指标特征,结合历史资料对梅家洲的形成与发展及其在历史时期对鄱阳湖的影响进行了探讨。随着古长江不断南迁,在长江与古赣江的共同作用下,2.3ka BP前后,在长江南岸湖口地区形成天然堤,即梅家洲。它的出现对古赣江来水产生阻水,导致了鄱阳湖形成并向南扩张。对比1970年和1980年湖口地区水下地形图,发现梅家洲仍在不断加积,其对鄱阳湖的阻水作用更加明显,将引起鄱阳湖湖区沉积环境的改变,给鄱阳湖带来生态环境等多方面的影响。     

试论安全性评价的特点与作用

阐述了安全性评价工作的特点,并结合开展安全性评价工作的实践,探讨了如何深入开展好安全性评价工作。     

安全教育在企业安全管理中的地位与作用

阐述了安全生产教育的重要性 ,以及安全教育在企业安全管理中占有极其重要的地位和作用 ,它是提高职工安全文化素质 ,增强预防、控制事故能力的有效途径 ,也是企业实现安全生产的重要措施之一。     

藻毒素对自来水提取物诱导大鼠肝癌的促进作用

为了研究自来水有机提取物与藻毒素在大鼠肝癌诱导过程中的协同作用.以自来水有机提取物为启动剂,藻毒素为促进剂,构建大鼠肿瘤促进模型(Solt-farber模型),观察肝脏病理形态改变,并检测肝细胞中c-fos、c-jun、GSTPi表达情况.结果表明,实验组动物肝脏产生结节性增生灶,自来水有机提取物能诱导肝细胞GSTPi表达,藻毒素单独作用不能诱导GSTPi表达,但能够促进自来水有机提取物诱导产生的GSTPi表达;同时,藻毒素还能诱导肝细胞中c-fos、c-jun表达增加,并具有一定的剂量反应关系.自来水有机提取物具有启动活性,藻毒素具有促癌活性,影响细胞MAPK信号旁路而诱导具有增殖潜能的启动细胞克隆增殖异常是藻毒素可能的促癌机制.     

阴离子对UV/H2O2/微曝气工艺降解双酚A 的影响

试验研究了水中典型阴离子对UV/H₂O₂/微曝气工艺降解内分泌干扰物双酚A 的影响.结果表明,随着HCO₃^-和NO₃^-浓度的增大,BPA的降解速率下降,当HCO₃^-浓度增加到400mg/L 时,反应常数(k)从0.1613min-1 降低到0.0804min^-1;当NO₃^-的浓度增加到800mg/L 时, k 值降低到0.1107min^-1;而SO₄²-和Cl-浓度在一定范围内增加时,有利于BPA 的降解,当SO₄²-的浓度为800mg/L 左右时,对降解促进作用最大, k 值增加到0.1814min-1;当Cl-的浓度为400mg/L 左右时, k 值增加到0.1772min-1,但是当浓度继续增加时,BPA 的降解速度将降低.4 种离子对BPA 的降解影响大小顺序为HCO₃^-> NO₃^->SO₄²->Cl-.     

膨润土对土壤腐殖质特性的影响

砂质土壤腐殖质含量低,影响了土壤肥力.文章通过田间条件下砂滤管试验,利用膨润土的吸附和粘结功能,研究了膨润土不同用量对土壤腐殖质特性的影响.结果表明:膨润土在促进松结态腐殖质分解、加速紧结态腐殖质合成方面发挥了重要作用,有利于增加土壤系统的内稳性.施用膨润土促进了紧结态和稳结态腐殖质中HA的积累,提高了HA/FA比.胡敏酸红外吸收光谱表明,膨润土能使其脂肪族物质增多、芳化度降低.膨润土具有提高土壤腐殖质含量,改善土壤腐殖质特性,从而提高了土壤肥力.     

Purified terephthalic acid wastewater biodegradation and toxicity

The biodegradation and toxicity of the purified terephthalic acid（PTA） processing wastewater was researched at NJYZ pilot with the fusant strain Fhhh in the carrier activated sludge process（ CASP）. Sludge loading rate（SLR） for Fhhh to COD of the wastewater was 1.09 d^-1 and to PTA in the wastewater was 0.29 d^-1. The results of bioassay at the pilot and calculation with software Ebis3 showed that the 48h-LC50 （median lethal concentration） to Daphnia magna for the PTA concentration in the wastewater was only 1/10 of that for the chemical PTA. There were .5 kinds of benzoate pollutants and their toxicities existing in the wastewater at least. The toxicity parameter value of the pure chemical PTA cannot be used to predicate the PTA wastewater toxicity. The toxicity of the NJYZ PTA wastewater will be discussed in detail in this paper.     

Photodegradation of nitroaromatic compounds in aqueous solutions in the UV/H2O2 process

Photodegradation of nitrobenzene and nitrophenols in aqueous solutions by means of UV/H2 O2 process was studied in the Rayox batch reactors. Three nitrophenol isomers were identified as main photoproducts in the irradiated NB aqueous solutions. The distribution of nitrophenol isomers follows the order p-〉 m-〉 o-nitrophenol. Other intermediates detected include nitrohydroquinone, nitrocatechol, catechol, benzoquinone, phenol, nitrate/nitrite ions, formic acid, glyoxylic acid, maleic acid, oxalic acid and some aliphatic ketones and aldehydes. The degradation of nitrobenzene and nitrophenols at initial stages follows the first-order kinetics and the decay rate constants for nitrobenzene（NB） are around l0^-3-10^-2 s^-1 and for nitrophenols are around 10^-2 s^-1. The decomposition of H2 O2 in the presence of NB and each nitrophenol isomers follows zero-order kinetics. The quantum yields at initial stages for NB decay were estimated around 0.30 to 0.36, and for NPs decay is around 0.31-0.54.     

Adsorption of dyes onto activated carbon prepared from olive stones

Activated carbon was produced from olive stones（OSAC） by a physical process in two steps. The adsorption character of this activated carbon was tested on three colour dyes molecules in aqueous solution： Methylene blue（MB）, Rhodamine B（RB） and Congo Red（CR）. The adsorption equilibrium was studied through isotherms construction at 30℃, which were well described by Langmuir model. The adsorption capacity on the OSAC was estimated to be 303 mg/g, 217 mg/g and 167 mg/g respectively for MB, RB and CR. This activated carbon has a similar adsorption properties to that of commercial ones and show the same adsorption performances. The adsorption kinetics of the MB molecule in aqueous solution at different initial concentrations by OSAC was also studied. Kinetic experiments were well fitted by a simple intra-particle diffusion model. The measured kinetics constant was influenced by the initial concentration and we found the following correlation： Kid = 1.55 C0^0.51.