Comparative Analysis of Ecophysiological Characteristics of Stephanodiscus hantzschii Grun. in the Periods of Its Bloom in Recreational Water Bodies

In the periods of summer and autumn bloom of the Stephanodiscus hantzschii Crun. in recreational water bodies, studies on the vertical distribution of chlorophyll a, its contents per unit biomass, efficiency in using photosynthetically active radiation (E_PhAR), and assimilative activity of microalgae were performed. The results confirmed the existence of two ecophysiological forms of St. hantzschii and provided evidence that both forms are typically autotrophic and can efficiently use low-intensity PhAR for photosynthesis.     

Phosphate recovery with granular acid-activated neutralized red mud: Fixed-bed column performance and breakthrough curve modelling

Granular acid-activated neutralized red mud (AaN-RM) has been successfully prepared with good chemical stability and physical strength. However, its potential for industrial application remains unknown. Therefore, the performance of granular AaN-RM for phosphate recovery in a fixed-bed column was investigated. The results demonstrated that the phosphate adsorption performance of granular AaN-RM in a fixed-bed column was affected by various operational parameters, such as the bed depth, flow rate, initial solution pH and initial phosphate concentration. With the optimal empty-bed contact time (EBCT) of 24.27 min, the number of processed bed volumes and the phosphate adsorption capacity reached 496.95 and 84.80 mg/g, respectively. Then, the saturated fixed-bed column could be effectively regenerated with a 0.5 mol/L HCl solution. The desorption efficiency remained as high as 83.45% with a low weight loss of 3.57% in the fifth regeneration cycle. In addition, breakthrough curve modelling showed that a 5-9-1 feed-forward artificial neural network (ANN) could be effectively applied for the optimization of the fixed-bed adsorption system; the coefficient of determination (R²) and the root mean square error (RMSE) evaluated on the validation-testing data were 0.9987 and 0.0183, respectively. Therefore, granular AaN-RM fixed-bed adsorption exhibits promising potential for phosphate removal and recovery from polluted water.     

Nonstationary, long memory and anti-persistence in several climatological time series data

In this article we examine the stochastic behaviour of several daily datasets describing sun (total irradiance at the top of the atmosphere and sunspot numbers) and various climatological anomaly series by looking at their orders of integration. We use a testing procedure that permits us to consider fractional degrees of integration. The tests are valid under general forms of serial correlation and deterministic trends and do not require estimation of the fractional differencing parameter. Results show that the series are all nonstationary, with increments that might be stationary for those variables affecting sun, and anti-persistent for those affecting air temperatures.     

CODMn重新稀释取样体积的推定

对原CODMn法测地表水二次取样体积进行了推导，建立了实际适用取样体积公式，具有一定的适用性。     

Effects of acid deposition on forests in south China

１ＩｎｔｒｏｄｕｃｔｉｏｎＷｉｔｈｔｈｅｆａｓｔｇｒｏｗｉｎｇｏｆｍｏｄｅｒｎｉｎｄｕｓｔｒｙａｎｄｓｈａｒｐｌｙｉｎｃｒｅａｓｉｎｇｏｆｅｎｅｒｇｙｃｏｎｓｕｍｐｔｉｏｎｐｒｉｍａｒｉｌｙｃｏａｌ，ａｉｒｐｏｌｕｔｉｏｎａｎｄａｃｉｄｄｅｐｏｓｉｔ...     

中─高级变质相中水热流体的形成与作用

固体地壳中流体是普遍存在的，中—高级变质相中的矿物并非只发生晶体塑性变形，溶解和溶移作用在非糜棱岩化岩石中占主导地位，因为高温高压环境下存在的水热流体，在变质变形作用中起着至关重要的作用。在周围分布有网络状进进剪切带的递进缩短带中，与应交梯度有直接关系的单个矿物的位错密度梯度在其晶体边缘形成，产生了化学位梯度，从而使矿物边缘发生溶解。变形分解作用是产生这一过程的动力，并为流体汇聚形成水热循环系统提供了空间。     

修正光度法测定痕量阳离子表面活性剂

阳离子表面活性剂与二甲酚橙在ｐＨ７～８的溶液中发生显色反应，用修正光度法处理，能消除空白干扰，提高分析灵敏度，该方法检出限为０．０８ｍｇ／Ｌ，线性范围０～１５ｍｇ／Ｌ，加标回收率９６％～１０２％，适于环境痕量分析。     

活性污泥作为气化用型煤粘结剂的研究 Ⅰ.污泥添加量和型煤成型条件的考察

以活性污泥为研究对象，以合成氨厂广泛使用的白泥型煤参照，进行了气化用型煤粘结剂的研究，结果表明，当污泥添加量为２％白泥添加量为０．３％时，所制得的型煤抗压强度、跌落强度、热稳定性与白泥型相当。     

上海市废水排放趋势分析

用可持续发展评价指标体系中的部分驱动力指标或源指标，结合同期上海市的主要宏观经济数据，对上海市20年来的废水排放量及其污染负荷等重要环境指标进行了趋势分析。分析结果显示，20世纪80年代以来，上海市废水及其污染物排放总量的增长均大幅度低于GDP的增长速度，工业污染物的排放控制与削减成效显著。虽然，上海市大部分表征可持续发展的源指标在国内均处于领先地位，但与工业国家相比，还存在明显差距：上海市在综合生活污水及其污染物排放等非工业污染物方面的控制力度相对较小，综合生活废水量和污染物排放量成为上海市最重要的水环境点污染源。     

深井曝气法中空气量的计算

从垂直气液两相流运行动力学角度,提出深井工艺设计中空气量的计算方法。经验证,用此法计算出的风量、风压,可以在工程设计中较合理地选用空压机或鼓风机。