Study on the flocculability of metal ions by<Emphasis Type="Italic">Bacillus mucilaginosus</Emphasis> GY03 strain   总被引：1，自引：0，他引：1  

连宾陈烨  袁生朱立军  刘丛强 《中国地球化学学报》2004,23(4):380-386

This study deals with the flocculability of two types of metal ions by Bacillus macilaginosus GY03 Strain, with an emphasis on the influence of pH conditions, volume and time of flocculants produced by GY03 Strain on the adsorption of metal irons such as Pb^2 and Mn^2 and the capabilities of floceulants to adsorb metal ions of different concentrations. The results showed that microbial flocculants produced by Bacillus mucilaginosus GY03 Strain are highly capable of flocculating metal ions, but show different effectiveness with respect to the adsorption of Pb^2 and Mn^2 . In accordance with the experimental data and actual waste-water treatment conditions, the relevant regression equation of floeculation has been deduced, which has found some application in practice. The experimental results of this study demonstrated that microbial flocculants produced by Bacillus mucilaginosus can be used to treat metallic ion-containing waste water. In practical application the volume of microbial floceulants required and flocculation conditions should be taken into comprehensive consideration in accordance with the properties of metal ions, the composition of anions and the solubility of other metals, in combination with the cost and effectiveness of floceulants to be used. Floeeulant used in this experiment has the advantages of being applied over a wide range of pH values, small flocculant volume, and rapid speed of floeeulation. So this kind of flocculant is within excellent prospect of application.  相似文献   

一种基于Agent位置透明及消息缓冲体的消息传递机制     

贾忠伟  唐功友  焦润海  郭山清 《中国海洋大学学报(自然科学版)》2004,34(1):115-120

针对移动 Agent的可靠消息传递问题 ,提出 1种基于 Agent位置透明及消息缓冲体的消息传递机制 ,并从 Agent命名、Agent服务注册和消息缓冲几个方面 ,给出消息传递机制的具体实现算法。与现有通信机制相比 ,较好解决了 Agent在移动前后及移动过程中的消息传递问题。  相似文献   

絮凝剂对紫菜酶解单细胞的絮凝作用及对其生长的影响     

周立冉  王海  戴继勋 《海洋科学》1997,21(6):46-49

就解决紫菜养殖和制饵的生产实践中出现的单细胞收集困难问题进行了初步研究。首次尝试利用细胞絮凝剂收集大型海藻的酶解单细胞，检查了几种常规絮凝剂及新型生物絮凝剂对其絮凝作用，观察了对其生长发育的影响。实验中发现常规絮凝剂明显具有明显的絮凝作用，浓度过高时有致畸作用；饱和石灰水和甲壳胺絮凝效果较好，但甲壳爱具有阻碍细胞发育的特点；Ｃａ＾２＋Ｍｇ＾２＋基本无絮凝作用；Ｆｅ＾３＋在高浓度时有效畸作用。  相似文献   

海洋工程地基处理问题的评述     

郑继民 《海洋科学进展》1992,(4)

本文阐述了海洋工程水下软土地基加固处理的实用方法:振冲法、真空预压法、高压旋喷法、爆破法、土工织物法、强夯法以及水泥石灰系拌和法.并对这些方法的施工研究及注意问题进行了专题详述.  相似文献   

含高浓度有机物及重金属的废水处理方法研究   总被引：2，自引：0，他引：2  

田由芸  袁璟 《海洋与湖沼》1997,28(5):536-542

采用铁屑综合处理含高浓度有机物及重金属的废水。经处理后的废水，重金属和ＣＯＤ均达到国家排放标准，研究了铁屑用量，作用时间等的最佳值，并对作用机理作了解释。  相似文献   

涠11-4平台结构动态响应监测结果分析(涠11-4平台原位监测研究之二)     

申仲翰  赵强 《海洋工程》1997,(3)

本文总结了针对涠１１－４平台一年多时间的应变和加速度监测数据的处理分析工作，详细介绍了所用的数据处理方法，给出了应变数据的统计结果及长期分布规律。通过对应变和加速度信号进行频谱分析，揭示了平台在多种环境条件下的振动特性。  相似文献   

利用耐盐沉水植物控制滨海再生水景观河道的富营养化研究   总被引：2，自引：0，他引：2  

王卫红  季民  薛玉伟  唐运平  张志杨 《海洋通报》2007,26(1):73-77

研究了由广盐性沉水植物川蔓藻(Ruppia maritima)构建的沉水植被系统对滨海再生水景观河道的富营养化控制。实验室静态试验与工程现场中试研究结果表明:由单一广盐性沉水植物川蔓藻构建的沉水植被系统对含盐量7000~13000mg/L的再生水中的氮和磷都有较高的去除率,当河道川蔓藻的生物量达4627gFw/m2时,再生水体中总氮和总磷的去除率分别达到74.6%和85.4%。出水氮磷浓度达到了《城市污水再生利用景观环境用水质》(GB/T18921-2002)的标准。泰达再生水河道中川蔓藻的生物量与河道水体中的叶绿素a存在显著的线性负相关。因此,在景观河道之前先构建一个川蔓藻沉水植被系统,对于利用再生水恢复与重建滨海湿地,并控制水体富营养化有重要作用。  相似文献   

唐山南堡开发区污水排海方案的优化选择研究     

尹毅  常乃环  秦学祥  赵克光  陈爱萍  仲维妮 《海洋科学进展》1997,(4)

本文应用现场勘测和数值模拟相结合的方法，预测了开发区近期（２０００年）及远期（２０１０年）的开发建设对该海域的污染影响，探讨了对该海域污染影响较小且技术可行，经济合理的污水排海方案，为开发区的建设和海洋环境保护提供了科学依据和对策。  相似文献   

Evaluating the impact of an agricultural land‐use change adaptation strategy on household crop production in semi‐arid Ghana     

Biola K. Badmos  Grace B. Villamor  Sampson K. Agodzo  Samuel N. Odai  Olabisi S. Badmos 《Singapore journal of tropical geography》2021,42(1):65-84

In this study, the Land Use Dynamic Simulator model was applied to investigate the impact of farm credit as an adaptation strategy to cope with effects of climate variability on agricultural land‐use change and crop production in the Vea watershed in Ghana. The authors identified the determinants of crop choices within the landscape (e.g., farm household and biophysical characteristics of farm plot). The crop choice sub‐model was then linked to the crop yield sub‐model to determine the yields of selected crops. In adapting to the impacts of climate variability, the maize credit adoption sub‐model under the maize cultivation credit scenario was integrated into decision‐making. This was simulated for a 20‐year period, and compared with the business‐as‐usual scenario. Under the simulated maize credit scenario, maize adopters increased from about 20 per cent to about 50 per cent and the area allocated for maize cultivation significantly increased by about 266 per cent. Consequently, the average annual aggregated household crop yield increased by 6.3 per cent higher than in the business‐as‐usual scenario. This simulation study shows that access to maize credit can significantly influence agricultural land‐use change and food availability in the study area. However, although access to farm credit may translate into food availability, the sustainability of this strategy is questionable.  相似文献   

新型捕收剂RA-92在低品位碳酸锰矿选矿中的应用     

肖红艳  徐晓晴  王斐  薛智勇  侯瑞强  严春杰  葛文  杨祥 《岩矿测试》2016,35(3):284-289

微细粒低品位锰矿由于颗粒间的非选择性聚集、浮选药剂用量大、浮选效率低等技术难题而致使其利用困难,造成大量浪费。在品位低于13%的锰矿浮选技术研究中,捕收剂最受关注,前人已研究了多种类型的捕收剂,所得精矿品位在16.9%~18.3%之间,回收率为56%~97%,回收率比较理想,但精矿品位总体不高。本文将新型捕收剂RA-92应用于湖南凤凰-花垣地区低品位碳酸锰矿(锰品位为10.7%)的选矿工艺中,实验研究了磨矿细度、pH值、抑制剂和捕收剂用量对浮选效果的影响,在最佳工艺条件下,精矿品位由原矿的10.7%提升至17.4%,回收率达到80.2%。研究表明RA-92对碳酸锰矿具有良好的捕收性能,浮选工艺相对简单且捕收剂用量少,浮选成本较低,可为此种捕获剂在微细粒低品位碳酸盐锰矿选矿中的应用得到推广。  相似文献