莱州太平湾及附近海域二维平流——扩散输运数值计算应用实例     

郭耀同  王学昌  韩守明 《中国海洋大学学报(自然科学版)》1994,(Z1)

应用ADI方法,建立莱州太平湾及附近海域的二维平流—扩散输运模型。在计算流场的基础上,对该海域沿岸排放的有机污染物对水质产生的影响做了计算分析及预测。  相似文献   

宁波及其邻近海域沉积物释放耗氧有机物（COD）的初步研究   总被引：2，自引：0，他引：2  

应时理  熊健 《海洋学研究》1996,14(2):59-63

本文通过对城市污水纳污海区沉积物样品释放有机物的研究，初步揭示了沉积物释放耗氧有机物（ＣＯＤ）的一般规律。研究表明宁波海域沉积物释放ＣＯＤ的范围在０．１５×１０－３～０．８０×１０－３之间，释放速率平均为１０３．９ｍｇ／（ｍ２．ｄ）；舟山沈家门附近海域沉积物释放ＣＯＤ速率平均为２５３．１ｍｇ（ｍ２·ｄ）。沉积物释放ＣＯＤ的量与沉积物中有机质的含量成正比，而其释放速率与沉积物有机质的含量关系不大。  相似文献   

海西湾潮流、COD扩散运动的数值模拟     

舒良华  汤毓祥 《海洋科学进展》1992,(1)

本文采用 ADI 方法模拟了海西湾的潮流、水位场和 COD 扩散运动,所得结果与观测值符合较好。计算结果表明:海西湾自净稀释能力良好;扩建后的薛家岛码头,若以0.5t/d 的 COD 负荷量排放,整个海湾水均属一类水质;如果以二类水质标准来评价距离码头500m 以外的海域,薛家岛码头的最大 COD 负荷量可达2.3t/d.  相似文献   

中国近海海水紫外吸收及直接用于测定海水COD     

应骏  陈国华  黄磊  侯进  晋治涛 《中国海洋大学学报(自然科学版)》2005,35(2):313-316,312

为探讨海水水质监测的简便可行方法,对渤海、北黄海、胶州湾、东海、长江口、南海及珠江口几百个海水样品紫外扫描发现,不同海区海水紫外吸收约在200～220nm之间。其中渤海、北黄海与胶州湾海水样品在208～210nm之间,而东海、长江口、南海及珠江口水样在205nm附近。海水紫外吸收吸光度与高锰酸钾法测COD值之间具有良好的线性关系。所以提出了用紫外分光光度法测定海水COD值的方法,发现紫外分光光度法与碱性高锰酸钾法测定海水COD值无显著性差异,可以满足快速监测的需要。  相似文献   

Fate of Lignin in the Process of Aerobic Biological Treatment of Paper Mill Wastewater     

Brigitte Helmreich  Christian Schlegl  Peter A. Wilderer 《洁净——土壤、空气、水》2001,29(5):296-300

Although lignin is known to be not readily biodegradable the concentration of dissolved lignin decreased during aerobic biological treatment of paper mill wastewater performed in sequencing batch reactors (SBR). Systematic lab scale batch tests were conducted to clarify whether the observed removal of lignin was the result of biodegradation or adsorption onto the activated sludge. For the batch tests, sludge samples were taken from sequencing batch reactors operated at solid retention times (SRT) of 10, 15, 20, 30, and 40 days, respectively. The amount of lignin present in the bulk liquid and in the sludge samples was quantified by an analytical procedure comprising pyrolysis, gas chromatography and mass spectrometry (py‐GC/MS analysis). It was found that lignin adsorbs onto the activated sludge by up to 30%[TH]w/w. This demonstrates the sludge excellent adsorption properties. The ultimate removal of lignin is achieved by sludge wasting. The highest overall removal rate was found when sludge was used from the SBR run at SRT of 20 days.  相似文献   

Shifts in the Processes of Oxygen and Nutrient Balances in the River Elbe since the Transformation of the Economic Structure     

H. Guhr  B. Karrasch  D. Spott 《洁净——土壤、空气、水》2000,28(3):155-161

The reduction of pollution in the river Elbe since 1990 has resulted in changes in the processes taking place in the river. The heterotrophic degradation which dominated until 1990 was accompanied by a lack of oxygen, floating masses of sewage fungi, and sludge formation in the areas of still water. Since the early 1990s, autotrophic processes have come to dominate, with an increase in pH fluctuations and the oxygen production potential, but evidently not the chlorophyll level during the growing season. The degradable organic pollution of the Elbe is determined by algae production. The high levels of ammonium previously encountered in the Elbe were attributable to not only dischargers but also in particular the lack of oxygen in the water. Via heterotrophic nitrate assimilation, nitrate served as an oxygen reserve, resulting in high levels of nitrite. At present, when the oxygen contents are sufficient, the concentration reductions of nitrate and nitrite along the reach of the Elbe are approximately parallel, which in view of the lack of ammonium indicates the denitrification of microzones low in oxygen. The relative proportion of structurally bound substance turnover will become increasingly important for the Elbeπs material budget.  相似文献   

Electrochemical Degradation of Remazol Black B Dye Effluent     

Poppana Antony Soloman  Chiya Ahmed Basha  Manickam Velan  Veerappan Ramamurthi  Kandasamy Koteeswaran  Natesan Balasubramanian 《洁净——土壤、空气、水》2009,37(11):889-900

This study focused on the electrochemical degradation of hydrolyzed Remazol Black B (CI Reactive Black 5), a common diazo reactive dye, in aqueous solution. In the presence of various auxiliary dye chemicals, a typical Remazol Black simulated exhausted dyebath liquor was treated electrochemically in various basic electrochemical reactor configurations such as batch, batch recirculation and single pass systems. The effect of current density, supporting electrolyte concentration, electrolysis duration, specific electrode surface and fluid flow rate on pollutant removal and energy consumption performance of the systems was critically evaluated. Batch studies show the following operating parameters, current density: 2.5 A/dm², electrolysis duration: 6 h, and supporting electrolyte concentration: 3 g/L, were optimal for good overall performance of the system. Color removal was complete by 3 h of treatment for all combinations of parameters studied. The pollutant removal performance of the batch recirculation system was found to have improved considerably by increasing the flow rate. Performance of the batch recirculation system was comparatively better than the other rector configurations studied, with respect to capacity utilization and energy consumption.  相似文献   

滇池化学需氧量及营养盐负荷量的预测     

吴德玲 《湖泊科学》1993,5(4):358-366

本文采用多元线性回归及合田健模型分别对滇池有机污染及富营养化的主要因子COD、TN、TP进行预测,并将污染负荷量分至各点源。定量说明污水处理厂对治理城市污水的积极作用,为流域进行污染治理提供了科学依据。  相似文献   

Simultaneous Organic Matter and Nitrogen Removal from Piggery Slaughterhouse Wastewater Using Bioaugmented Gaslift Membrane Bioreactor     

Nguyen Duc Toan  Nguyen Van Tuyen  Pham Bang Hai  Nguyen Thi Hoang Ha  Do Tien Anh  Bach Quang Dung 《洁净——土壤、空气、水》2023,51(1):2200106

A single bioaugmentation reactor and a side-stream gaslift membrane bioreactor combined with bioaugmentation are conducted to treat real wastewater from a centralized piggery slaughterhouse in Vietnam. The bioaugmented reactor is inoculated with heterotrophic microorganisms (Bacillus sp.) isolated from piggery slaughterhouse wastewater. The results of a single bioaugmentation experiment show high removal efficiency of chemical oxygen demand (COD) (84.8%–97.5%) and total nitrogen (TN) (69.9%–87.2%) at loading rates of 1.28–3.89 and 0.14–0.37 kg m⁻³ d⁻¹, respectively. The combined system demonstrates a significantly higher TN removal efficiency (89.0%–96.1%) (p < 0.001), more stable flux (36.0–38.4 L m⁻² h⁻¹), and transmembrane pressure (0.95–1.05 bar), and better capacity of separation of solid–liquid phases compared to the single bioaugmentation. High COD and TN removal efficiency is possibly due to assimilation and simultaneous nitrification and denitrification processes. The results of this study also indicate the feasibility and propitious efficiency of the bioaugmented gaslift membrane bioreactor for piggery slaughterhouse wastewater treatment.  相似文献   

水环境COD遥感识别模式及其应用   总被引：6，自引：2，他引：4  

黄妙芬  齐小平  于五一  张一民 《干旱区地理》2006,29(6):885-893

利用2006年4月6-7日在甘肃省庆阳市境内环江、柔远河和马莲河实测的水体波谱数据,以及化学需氧量COD测定数据,采用Fisher判别分析方法,建立了基于地面实测光谱数据并适用于本研究区域的水环境COD遥感识别模式;将该模式应用于2005年10月16日和2006年4月10日过境的两景Landsat/TM图像;根据遥感模式反演结果图,对该区域水环境COD的时空变化进行了分析。水环境COD污染遥感模式的建立可为从遥感影像上快速、大面积获取COD信息提供了一种技术手段。  相似文献