氯/紫外工艺辅助MBR出水应急脱氮

氯/紫外(Cl/UV)工艺十分适合低有机物污水的应急脱氮处理。文中研究了Cl/UV工艺辅助膜生物反应器(MBR)脱氮的效果和影响因素,并研究确立了最佳工艺参数。结果表明,Cl/UV工艺可以在相同Cl/N下,实现比折点氯化更好的脱氮效果、更低的出水余氯含量。工艺进水的pH值在6.5~8.0对处理效果没有显著影响。当进水氨氮质量浓度<12 mg/L时,采用Cl/UV工艺比折点氯化更经济,此时可以通过文中公式计算最佳Cl/N。过高的进水COD_(Cr)(>50 mg/L)会导致所需Cl/N增加,且Cl/UV工艺对COD_(Cr)的去除效果不佳。Cl/UV工艺产生的消毒副产物主要为三氯甲烷、三氯乙烷、三氯乙醛和二氯乙腈,生成量随Cl/N的增大而增大,随初始氨氮浓度和UV强度的增大而下降。

混凝-氯/紫外高级氧化与双膜工艺联用处理微污染窖水

实验采用混凝、氯/紫外高级氧化联用膜组合工艺处理西北地区微污染窖水,结果表明:原水在PAC投量为30 mg/L,有效氯投量为6 mg/L、紫外辐照时间为8 min时,浑浊度、高锰酸盐指数、UV_(254)、氨氮去除率分别达到了92.1%、61.57%、65.18%、73.53%;出水经膜组合工艺处理,在进水温度为18℃,pH为7.5、复合微滤操作压力0.1 MPa、纳滤操作压力为0.4 MPa的条件下,组合工艺终端出水浑浊度、高锰酸盐指数、UV_(254)、氨氮去除率分别达到100%、98.04%、100%、90.27%,出水水质符合GB 5749-2006《生活饮用水卫生标准》要求,此外对微污染窖水中溶解性有机物通过三维荧光光谱检测分析,组合工艺终端出水溶解性有机物的三维荧光强度总去除率达到99%以上,大幅降低了微污染窖水的三致风险.组合工艺在解决了西北地区饮用水安全问题的基础上为微污染水体净化提供了技术支撑.

氯/紫外耦合工艺去除低温水中氨氮的中试研究

利用牡丹江某水厂的中试装置,研究了氯/紫外耦合工艺对低温期水中氨氮的去除效能。考察了氯氮质量比、紫外光照强度、紫外接触时间和紫外剂量4个因素对氨氮去除效能的影响。试验结果表明,紫外光照强度、紫外接触时间、紫外剂量和氯氮质量比对氨氮去除均有影响;氯/紫外耦合工艺能够在较低氯氮质量比条件下,实现对氨氮的有效去除,为解决低温期氨氮难去除的问题提供了新途径。

基于改进层次分析法的氯/紫外工艺效能评估方法

为明确氯/紫外工艺的技术特征与优势,开展了可量化的评估体系与方法研究。利用松花江流域牡丹江地区某供水厂中试平台,通过氯/紫外工艺中氯氮比与紫外剂量的不同组合,得出12种方案,采用改进层次分析法构建氯/紫外工艺综合效能评估模型,对其进行定量评估,得到以控制氨氮为目标的工艺最优运行参数范围,即氯氮比为5~6、紫外剂量为33.5~48.0 mJ/cm^(2)。

Effect of combination of ultraviolet radiation and biocide on fungal-induced corrosion of high-strength 7075 aluminum alloy

The effect of ultraviolet(UV)radiation and biocide benzalkonium chloride(BKC)on fungal-induced corrosion of AA7075 induced by Aspergillus terreus(A.terreus)was deeply studied using analysis of biological activity,surface analysis,and electrochemical measurements.Results demonstrated that the planktonic and sessile spore concentrations decline by more than two orders of magnitude when UV radiation and BKC are combinedly used compared with the control.UV radiation can inhibit the biological activity of A.terreus and influence the stability of passive film of AA7075.Except for direct disinfection,the physical adsorption of BKC on the specimen can effectively inhibit the attachment of A.terreus.The combination of UV radiation and BKC can much more effectively inhibit the corrosion of AA,especially pitting corrosion,due to their synergistic effect.The combined application of UV radiation and BKC can be a good method to effectively inhibit fungal-induced corrosion.

UV enhanced gas–solid synthesis of chlorinated poly vinyl chloride characterized by a UV–Vis online analysis method

Dynamic characteristics of UV enhanced gas–solid PVC chlorination process were revealed by a UV–Vis spectral online analysis method. Experimental results showed an instantaneous increase of the chlorination rate as soon as UV light was affiliated, which demonstrated the intensified effect of UV radiation on PVC chlorination directly.Different affiliation methods of UV light were then studied, proving that continuous UV radiation could enhance the chlorination process significantly while intermittent UV radiation was able to initiate the chlorination reaction once it was conducted. Besides, experiments were carried out to study the influences of parameters on the chlorination process such as UV wavelength, chlorination temperature, partial pressure of chlorine gas and PVC raw materials. Among all the parameters, chlorination temperature and partial pressure of chlorine gas were testified as two key factors to determine the chlorination performance. Thermal analysis of CPVC products showed that their corresponding properties such as the glass transition temperature(Tg) and the homogeneity of chlorine distribution in polymer phase were improved with the increase of chlorine content.

Photorheology and rheokinetics of CTAB/chlorocinnamic acid micelles

The photosensitive micellar system with prospect in drag reduction and heat transfer enhancement has been the research focus of science and industry.In this paper,a new type of photosensitive micellar system formed by cetyl trimethylammonium bromide(CTAB) and trans-chlorocinnamic acid(trans-CICA) was investigated.The effects of counter-ion concentration,surfactant concentration,UV irradiation time,and the position of substituent groups of counter-ion on photorheological properties were discussed.The results indicate that after UV irradiation the relative viscosity and thixotropy of micellar systems reduce obviously.At the same time,the relative viscosity of micelle systems and concentration of trans-CICA decline during UV irradiation time.The flow curves of micellar solutions before and after UV irradiation could be described by non-linear co-rotational Jeffreys model correctly.The rheokinetic equation was firstly established to describe the relationship between relative viscosity of micelle systems and conversion of trans-CICA.

Gold （III） Complexes with Thiolactate and bis-（1,4-Sodiumthiolactate） Butane Ligands

The new ligand bis-（1,4-sodium thiolactate） butane （L）-O2CCH3S-（CH2）4SCHCH3CO2- has been prepared from the reaction of disodium salt of thiolactic acid and 1,4-dichlorobutane, while the disodium thiolactate was prepared instanteously through the reaction of thiolactic acid with NaOH. Mono and dinuclear complexes were obtained by direct reaction of the above ligands with H[AuCI4] in 1 ： 1, 2：1, 1：2, 2：2 and 3：1 ligands to metal molar ratio. The prepared complexes were characterized by elemental analysis, spectral studies FTIR （Fourier transform Infrared） and UV-Vis, magnetic measurement, conductivity measurement and IHNMR for the ligand （L） and some of the complexes. The conductance data indicate that the complexes of the formulas Na[Au（SCH3CHCOO）2], Na[Au（SCH3CHCOO）（OOCCHCH3SH）2] and [Au（L）]Cl are 1：1 electrolyte. Electronic spectra and magnetic moment values indicate the presence of square planner geometry around Au（III） ions.

Development of an HPLC-UV method for the simultaneous determination of epirubicin,amlodipine and dequalinium in anti-resistant liposomes

Novel anti-resistant liposomes have been developed to overcome intrinsic resistance in leukemia.Anticancer agent epirubicin and apoptotic inducer amlodipine were encapsulated into the liposome aqueous core,and the surface of the liposome was modified using dequalinium.The objective of the present study was to establish a high performance liquid chromatography （HPLC） method for the determination of epirubicin,amlodipine and dequalinium in the liposomes.Analysis was performed on an ODS column with an isocratic elution at ambient temperature.Mobile phase was consisted of acetonitrile,0.02 M NaH_2PO_4 and triethylamine（34：66：0.3,v/v/v,pH 4.0）.The detection wavelength was set at 240 nm and the flow rate was 1.0 mL/min.The results showed that the calibration curves of epirubicin,amlodipine and dequalinium were linear in the range of（1-50）μg/mL（r^2= 0.9999）, respectively.The mean recoveries of epirubicin,amlodipine,and dequalinium were in the range of 95.86%-97.52%,97.17%-98.92% and 98.04%-101.13%,respectively.The contents of epirubicin,amlodipine and dequalinium in the liposomes were in the range of（564.2-606.1）μg/mL,（641.0-704.0）μg/mL,and（816.0-898.0）μg/mL,respectively.The encapsulation efficiencies of epirubicin and amlodipine were around 90%,and the modification rate of dequalinium was approximate 70μg/μmol lipids.The proposed HPLC method was simple and accurate for the simultaneous determination of epirubicin,amlodipine and dequalinium in newly developed anti-resistant liposomes.