炉渣处理含磷废水的实验研究

以炉渣作为吸附剂，用静态吸附实验方法研究了炉渣对模拟含磷废水脱磷的一般规律，结果表明，炉渣是一种有效的吸附剂，对废水中的磷有较强的吸附去除性能。影响炉渣除磷的主要因素有吸附时间、炉渣用量、pH值和原水含磷浓度。在含磷浓度2～13mg／L、炉渣用量5g／L、中性、吸附时间为2h的实验条件下，磷的去除率可高达99％以上。     

Preliminary study on limiting nutrients in seawater ponds

INrnODUCTIONTheaqUacultareindustryofChinaedsfirstintheworld-Fertilizationinfreshwatershasalonghistory,andiseffectivelyaPpliedforfishcultUre.Scholarsfromvchouscotm-trieshaveheenstudytngfertiliZationtheory,tecboqUeandaqUactiltUreecologyinfertilizedPOnds-SPecialattentionisgiventothetwncyandaPPlicationlevelwhenmantireisused,andtothekindandN:PraioOfchethecalfertilizersused(Boyd,l99o;li,I993;MoriartyandPullin,l987).Thedrpthecchacteristicsofphosphorus,andtheroleofureaappliedintoPOndswere…     

中国南极长城湾及附近海区1993/1994年度夏季表层水样无机氮、磷酸盐的浓度及其分布状况(英)

The concentrations and distributions of four species of inorganic nutrient salts in surface sea water of Chinese Great Wall Bay and its adjacent sea area, Antarctica were surveyed during austral summers of 1993～1994.The results obtained are as follows:The general concentrations of NH4-N, NO3-N, NO2-N and PO4-P are 2. 13, 7. 07, 0. 74 and 1. 12 μg. din-3, respectively. Generally speaking, the concentrations are higher inside the Bay than those　 outside and the higher values of those inorganic salts often appear in December. The time for the station　where their higher and lower concentrations appear are not completely the same. The descending order　of the magnitudes of ΣN/P value according to the arrangement monthly is: Dec. Feb. Jan.. The　 variations of water temperature are mostly consist with the concentrations of NH4-N, PO4-P and ΣN/P, but not often with NO2-N. The low concentrations of nutrient salts as shown in some stations may be related with absorption by phytoplankton, perhaps including autotrophic bacteria.The results suggest that the area surveyed has a typical characteristic of an inner shallow water bay, sub-Antarctica. The nutrients needed for phytoplankton are sufficient, and the Bay surveyed is still in a normal condition.     

湖水-沉积物界面内源物质交换动态复水模拟研究

分布式采集了玄武湖底长期暴露的底泥,分析了底泥营养物的分层分布及其理化特性对湖泊水质的影响强度。通过动态换水试验,研究了复水过程中暴露底泥营养盐的释放过程和上覆水总磷、总氮浓度变化对水土界面物质交换的作用关系以及对水体富营养化程度的影响机制。实验及模拟表明:由于湖泥表层长期暴露,有机及结合态营养盐降解为无机态营养盐,即使复水过程中使用清水,但由于干涸湖床沉积物总磷T-P、总氮T-N的垂直分布,也将严重导致内源营养盐释放总量持续增加,在相对长时间内,上覆水总磷浓度仍维持在较高(01mg/L)水平。研究成果为实施生态修复,治理复水后湖体富营养化提供了理论和实验依据。     

测距仪加、乘常数求解方法的探讨

在建立检定测距仪加、乘常数的数学模型基础上，探讨了运用初等数学方法推导加、乘常数的求解公式的方法。     

Henry's law coefficients for aqueous solutions of acetone,acetaldehyde and acetonitrile,and equilibrium constants for the addition compounds of acetone and acetaldehyde with bisulfite

Vapor phase concentrations of acetone, acetaldehyde and acetonitrile over their aqueous solutions were measured to determine Henry's law partition coefficients for these compounds in the temperature range 5–40 °C. The results are for acetone: ln(H ₁/atm)=–(5286±100)T+(18.4±0.3); acetaldehyde: ln(H ₁/atm)=–(5671±22)/T+(20.4±0.1); and acetonitrile: ln(H ₁/atm)=–(4106±101)/T+(13.8±0.3). Artificial seawater of 3.5% salinity in place of deiionized water raisesH ₁ by about 15%. A similar technique has been used to measure the equilibrium constants for the addition compounds of acetone and acetaldehyde with bisulfite in aqueous solution. The results are ln(K ₁/M ^–1)=(4972±318)/T–(11.2±1.1) and ln(K ₁/M ^–1)=(6240±427)/T–(8.1±1.3), respectively. The results are compared and partly combined with other data in the literature to provide an average representation.     

二维地表相邻多个半圆弧沟谷对SH波的散射

本文由解析法研究了二维地表相信多个圆弧沟谷对稳态ＳＨ波的散射问题。文中把相邻多个圆弧沟谷对波的多重散射表达为各局部坐标的Ｆｏｕｒｉｅｒ－Ｂｅｓｓｅｌ级数之和，再利用Ｇｒａｆ加法公式在某一局部坐标中表达为双重级数形式，将问题归结为对一组线性方程的求解。最后，作为例子，给出了相信两圆弧沟谷对波散射的数值结果，讨论了沟谷对波的屏蔽、隔振作用及沟谷之间的相互作用。     

ICP—AES摄谱法测定河流湖泊底泥中总磷

本文探讨了用ICP-AES法测定河流、湖泊底泥中的总磷。使用HNO_3-HClO_4分解试样,将底泥中的聚合磷酸盐和有机磷全部转化为正磷酸盐,在P I255.3nm波长下测其发射强度,2％的HClO_4介质中测定范围为2—5000μg/ml的P。     

Relationship between texture and fractions of inorganic phosphorus in the surface sediment of a reservoir

Inorganic P was fractionated into three categories (NaOH-, BD- and HCI-extractable) for 30 surface sediment samples in La Minilla Reservoir (Sevilla, Spain). The amount of reactive P extracted with NaOH (NaOH-RP) and with HCI (HCI-RP) correlated in a multivariate regression with the clay and sand content of the sediment. This multivariate function should aid in predicting the amount of phosphorus available to the sediment organisms, and it can also contribute to the knowledge of the phosphorus budget of the reservoir.Supported by a Grant from CSIC-CONICET.     

红水河龙滩水库诱发地震地质条件的探讨

通过多方面的研究,认为龙滩水库区的巴鱼(龙鱼)、白层、沫阳及更新四个地区具备诱发地震的条件,其共同特点是:断裂破碎、有明显的活动性,断裂性质以剪性或张剪性为主,地表及深部岩溶发育。库水荷载主要支承在正断层或正向平推断层的上盘,且与区域构造应力场形成正向叠加现象,加速了断裂向失稳态发展