A novel sequence batch membrane carbonation photobioreactor developed for microalgae cultivation

A novel SBM-C-PBR was constructed for microalgae cultivation. Membrane fouling was greatly mitigated by membrane carbonation. NH₄⁺ and P removal rates were around 80% in SBM-C-PBR. Biomass was completely retained by membrane. In this study, a novel sequence batch membrane carbonation photobioreactor was developed for microalgae cultivation. Herein, membrane module was endowed functions as microalgae retention and CO₂ carbonation. The results in the batch experiments expressed that the relatively optimal pore size of membranes was 30 nm, photosynthetically active radiation was 36 W/m² and the CO₂ concentration was 10% (v/v). In long-term cultivation, the microalgal concentration separately accumulated up to 1179.0 mg/L and 1296.4 mg/L in two periods. The concentrations of chlorophyll a, chlorophyll b and carotenoids were increased about 23.2, 14.9 and 6.3 mg/L respectively in period I; meanwhile, the accumulation was about 25.0, 14.5, 6.6 mg/L respectively in the period II. Furthermore, the pH was kept about 5.5–7.5 due to intermittent carbonation mode, which was suitable for the growth of microalgae. Transmembrane pressure (TMP) was only increased by 0.19 and 0.16 bar in the end of periods I and II, respectively. The pure flux recovered to 75%–80% of the original value by only hydraulic cleaning. Scanning electron microscope images also illustrated that carbonation through membrane module could mitigate fouling levels greatly.     

自养型锰氧化菌的选育及除锰效果研究

自养型生物除锰滤池可以有效地去除地下水中的锰,为了获取接种该滤池的菌种并探究其除锰效果,利用改良的JFM培养基对曝气池中的活性污泥进行驯化培养,筛选出了除锰率在90%以上的高效自养型锰氧化菌。通过平板培养和革兰氏染色,得到3种不同的菌落且均为阴性菌,16S rDNA基因组测序发现5种不同的科属。菌液经过2个周期的传代培养,探究其除锰效果,最高除锰率达到了98%。     

家居室内设计及新进展的思考

在对传统室内设计基本观点阐述与理解的基础上分析其整体性、可持续发展,并着重探讨在物质文明和精神文明高度发展的今天,现代室内设计在个性化、自然性、现代性、艺术性等方面发展的新趋势.通过对现代室内设计特点和发展趋势的分析,创造出一个适合人们现代生活的理想空间.     

Salicylic acid involved in the regulation of nutrient elements uptake and oxidative stress in Vallisneria natans (Lour.) Hara under Pb stress

In this study, the alterations in nutrient elements content, reactive oxygen species level and antioxidant response were studied in leaves of Vallisneria natans (Lour.) Hara exposed to salicylic acid (SA, 10 or 100 μM), or Pb (50 μM) or their combinations for 4 d. No significant alterations in Mn and Ca content were observed but content of Cu, Zn, Fe and P decreased in plants exposed to SA alone. SA application inhibited the uptake of Pb and partially reversed Pb-induced the alterations in Mn, Ca and Fe content in leaves of V. natans exposed to 50 μM Pb. The decreased chlorophyll (a + b) and increased malondialdehyde and O²⁻ and H₂O₂ content were detected in plants exposed to 100 μM SA, 50 μM Pb, 10 μM SA + 50 μM Pb or 100 μM SA + 50 μM Pb. Application SA partially inhibited Pb-induced the increase of malondialdehyde, O²⁻ and H₂O₂ content. 100 μM SA decreased the activity of NADH oxidase and the content of non-protein thiols, carotenoids and ascorbic acid and increased the content of dehydroascorbate in plants treated with or without Pb. SA alone decreased the ascorbate peroxidase activity and increased the catalase and peroxidase activity, while SA application increased catalase activity but had no significant effect on ascorbate peroxidase and peroxidase activity in V. natans exposed to Pb. The results indicate that SA involves in the regulation of Pb uptake, nutrient balance and oxidative stress.     

膜生物反应器(MBR)-反渗透(RO)工艺深度处理印染废水的实验研究

采用膜生物反应器（MBR）-反渗透（RO）工艺对印染废水进行了深度处理实验。原水经MBR系统处理后,COD去除率、ss去除率和色度去除率分别达89．9％、100％和87．5％。MBR系统处理出水进入反渗透（RO）系统进行处理,硬度去除率和除盐率分别达99．62％和99．64％,同时可进一步除去剩余的COD、色度。系统出水水质满足生产回用的要求。     

TiO2纳米管催化降解4，4’-二溴联苯的影响因素和动力学研究

利用TiO2纳米管催化降解水中的4,4’-二溴联苯,对催化降解过程和影响因素进行研究。结果表明,TiO2纳米管对其有较高的催化降解效率且降解过程符合Langmuir—Hinshelwood动力学模式。不同光源、4,4’-二溴联苯的初始浓度、纳米管添加量和pH值对催化降解过程都有较大影响,其中pH值的影响最为明显。反应液在中性状态下的降解率明显低于pH=1或11的情况。在pH=1时,4,4’一二溴联苯的降解率达86％。     

江河中有机污染物在鲤鱼体内富集与释放的模拟研究

以第二松花江重点有机污染物硝基芳烃为研究对象,用改进的双膜理论预测了７种硝基芳烃的挥发速率常数,快速测定了它们在鱼体内的富集与释放速率常数,用获得的参数及二室模型预测这７种化合物的鱼体内的迁移过程,并与模拟实验测定的结果进行比较,得到了比较满意的结果。     

对一株海洋发光细菌保存方法的探究

从乌贼体表及内脏中提取一株海洋发光细菌,进行分离、纯化。通过四种不同保存方法对该株发光菌进行保存,测定了发光菌在存活期内的相对发光强度,探讨了最佳保存方法,比较发现:低温甘油法可在短期内替代条件苛刻的冷冻干燥法,可保存至少一年,沙土管保存法发光菌复苏效果差,不适宜保存发光菌,常温石蜡保存在实验室条件下可短期保存半年。     

金属涂料生产中挥发性有机物(VOC)的污染及其防治

阐明了金属涂料生产中挥发性有机物（VOC）的危害性,介绍了一种工程造价低,处理效果较好的治理方法,供投资生产金属涂料的生产者参考。     

我国古代灾害文学作品概说

我国古代文学的每个时期都有富于特色的文学形式,也有独具魅力的灾害文学作品,本文从各个历史时期抽离出具有代表性的灾害文学作品,如先秦时期的灾害神话和灾害诗歌,两汉魏晋时期的灾害诗歌和散文,唐宋时期的灾害诗歌,元明清时期的灾害小说等等,并对这些作品进行简单分析,以实现灾害文学基础性研究之目的。