磨溪天然气净化厂中水回用可行性探讨

文章对磨溪天然气净化厂外排废水的来源、水量、水质、处理工艺和达标情况进行了研究,探讨了工厂外排废水处理的中水回用的可行性,证明磨溪净化厂中水可用于厂内绿化,既可减少污染物排放,降低能耗,又可增加新鲜水资源,经济和环境效益明显。     

The Immobilization of Titanium Dioxide on Organic Polymers,for a Cost Effective and Energy Efficient Means of Improving Indoorair Quality

The formation and spray coating, with Degussa P25 titanium dioxide (TiO₂), of a room temperature curable resin to form a photocatalytically active material is described in this paper. The TiO₂ surface layers produced have been characteristed with the aid of scanning electron microscope analysis. The photocatalytic activity of the samples tested using a gas phase continuous flow type photoreactor, the test pollutant being propene. Analysis of the test results indicates the potential of TiO₂ coated polymers to form effective photocatalytic materials, with the potential to improve indoor air quality and reduce the energy consumption of ventilation systems.     

蚯蚓在污水土地处理中的应用分析

蚯蚓是一种重要的资源,一方面为人类提供蛋白质、氨基酸等营养;另一方面作为分解者,可以用来治理或降低环境污染,保护生态环境。污水土地处理具有低建设成本、低运行成本和管理方便等特点而引起了广泛关注,但土地处理也存在占地面积比较大,氮、磷去除率不高,土壤堵塞和运行不稳定等问题。针对这些问题,文章分析了蚯蚓在污染物去除、提高植物生物量和提高土壤渗透率等方面的作用,并分析了蚯蚓在解决污水土地处理中土壤堵塞、植物退化、水力负荷比较低和占地面积比较大等问题的可行性,提出将蚯蚓引入土地处理系统能提高土地处理的效率和运行的稳定性,加快污水土地处理技术的应用。     

改性活性炭净化PH3实验研究

通过钢瓶配气模拟和气相色谱GC-14C测定的方法,研究了改性活性炭吸附净化黄磷尾气中PH3的相关问题。结果表明:改性液浓度0.05mol/L、干燥温度120℃、焙烧温度250℃为改性炭制备的最佳条件;吸附反应阶段较适宜的温度为95℃,氧含量为1%。再生方法可行,可通过再生液回收磷酸。     

微污染地表水的植物净化试验研究

桂林桃花江作为漓江的一级支流,水质逐年恶化,富营养化情况加重．对桃花江内水生植物调查后,选取较常见的水生植物苦草、金鱼藻、黑藻、菹草和菖蒲,将它们栽种到试验用桶中,并用桃花江水培养。试验进行40d后,结果表明,在去除总氮、总磷等方面,金鱼藻和菖蒲的效果较好,对总氮的去除率分别达到80．1％和70．2％,对总磷的去除率为93．4％和88．2％,水生植物对氨氮的去除效果较总氮好,为47．2％～91．1％,而除金鱼藻外其它水生植物对CODCr的去除效果不明显,沉水植物菹草由于较适宜生长在流动水体中,净化效果相对较差。     

大九湖泥炭藓湿地对磷、铜污染物净化作用的模拟研究

在大九湖泥炭藓沼泽湿地采用野外实地模拟方法,就泥炭藓湿地对铜、磷两种污染物的净化能力进行了研究。结果表明,磷污染物浓度分别为10,100,1 000 mg/L时,两小时后泥炭藓湿地对该污染物的净化率分别为939%,695%,663%;同样的浓度梯度下,对铜污染物的净化率分别为1000%,976%,880%。泥炭藓湿地对污染物具有很强的净化能力,其泥炭层部分在湿地净化污染物中起到重要作用。利用拟一级动力学模型、修改上限的拟一级动力学模型、拟二级动力学模型、Elovich模型、双常数速率模型、抛物线扩散模型等6个模型对泥炭藓湿地的净化进行动态研究,其中后4个模型均可模拟湿地净化的动态过程。长期预测以拟二级动力学模型为最佳。     

Fabrication of Bi-Bi3O4Cl plasmon photocatalysts for removal of aqueous emerging contaminants under visible light

Photocatalytic oxidation of emerging contaminants (ECs) in water has recently gained extensive attentions. In this study, bismuth oxychloride-based plasmon photocatalysts (Bi-Bi₃O₄Cl) exhibiting high performance were successfully developed by reducing Bi³⁺ on the surface of Bi₃O₄Cl. Consequently, the photocatalysts were used to remove ECs from water. The effects of developmental process and Bi metal plasmon resonance on the photoelectric performances of Bi-Bi₃O₄Cl were investigated through a series of characterizations. The UV-vis diffuse reflection and photoluminescence spectra revealed that the light absorption range of the photocatalyst gradually increased and the electron recombination rate gradually decreased with the introduction of Bi metals. The optimal removal rates of ciprofloxacin and tetrabromobisphenol A by Bi-Bi₃O₄Cl were 93.8% and 96.4%; the respective reaction rate constants were 5.48 and 4.93 times higher than that of Bi₃O₄Cl. The mechanism study indicated that main reactants in the photocatalytic system were •O₂⁻ radicals and photogenerated holes, and the existence of oxygen vacancies and Bi metals promoted electron transfer in photocatalyst. In conclusion, this research produces a novel, green, highly efficient, and stable visible light photocatalyst for the removal of ECs from water.