养鱼池塘淤泥的性质 作用和改良办法

淤泥中含有大量有机物质,其成分很复杂,大致可分成非腐殖物质和腐殖物质两类.非腐殖物质主要是碳水化合物和含氮化合物,及部分矿物质泥沙.腐殖物质主要是胡敏酸和富里酸.

养鱼池塘淤泥的性质、作用和改良法

随着科技的进步，养殖方法的改进，更由于市场经济利益的驱动，目前我市池塘养鱼普遍采取高密度集约化放养鱼种苗(密者亩放4000—6000尾)，同时有许多鱼塘基配套禽畜场，高投饵，鱼类高排泄物，禽畜粪便落塘，造成养鱼池塘死亡的生物体、水中动物的粪便、残剩饲料和禽畜粪便及菜草等有机肥料不断积累，加上在夏秋雨水季节冲涮塘基的泥沙落塘，使到池塘底逐渐形成一定厚度的淤泥。

河湖淤泥固化与资源化技术及设备

技术简介 日本泥土再资源化协会推介的E—CUBE系统是对河湖疏浚污泥添加高分子絮凝剂和固化剂，改善淤泥性质，并实现资源化利用的技术和设备，主要由泥土料斗、泥土定量供给设备、固化剂定量添加设备、高分子絮凝剂供给设备、混合搅拌设备、油压系统和操作盘等组成。搅拌机是由特殊连续的移动翼和搅拌翼构成。

淤泥、淤泥质土特性分析

本文在收集、整理调兵山地区10个工程场地的岩土工程勘察资料以及做一系列室内土工试验的基础上，对调兵山地区淤泥、淤泥质土的工程性质指标和物理力学指标等进行了分析，并得出淤泥、淤泥质土的物理力学性质的相互关系。

东引运河流域河道生态清淤及淤泥处理技术探讨

为降低河道内污染,清淤是河道治理的一种重要措施,以东引运河流域河道为例,对其河道生态清淤及淤泥处理技术展开探讨,全面分析生态清淤以及淤泥处理效果。对该河道淤泥采样,分析淤泥的物理性质、有机污染情况、重金属污染情况;将分析结果和环境情况、污染和污泌程度相结合,主要使用机械脱水固结一体化措施,实现生态清淤和淤泥处理;并且在进行固结处理过程中,为实现资源的再利用,固结处理主要包含三个部分实现,分别为淤泥的钝化处理、固化处理、工业化利用处理,为东引运河流域河道治理提供可靠保障。

Characteristic of COD removal and sludge settleability in biological treatment of hypersaline wastewater

In order to investigate the feasibility of biological treatment of bypersaline wastewater produced from toilet flushing with seawater at low temperature, pilot-scale studies were established with plug-flow activated sludge process at low temperature （5-9℃） based on bench-scale experiments. The critical salinity concentration of 30 g/L, which resulted from the cooperation results of the non-halophilic bacteria and the halophilic bacteria, was drawn in bench-scale experiment. Pilot-scale studies showed that high COD removal efficiency, higher than 85 %, was obtained at low temperature when 30 percent seawater [ seawater/（seawater ＋ sewage） ] was introduced. The salinity improved the settleability of activated sludge, and average SV dropped down from 38% to 22. 5% after adding seawater. Sludge bulking could be forborne effectively because filamentous bacteria couldn＇t subsist under high salinity concentration.

Analysis on effective stress formula and consolidation of gassy muddy clay

In order to found an applicable equation of consolidation for gassy muddy clay, an effective stress formula of gas-charged nearly-saturated soils was introduced. And then, a consolidation equation was derived. Subsequently, supposing soils were under tangential loading, the expressions of pore water pressure were presented. The analytic solution of pore water pressure was attempted to be validated by the measured values in a real embankment. The parameters in the expressions of pore water pressure were gotten by the method of trial. The result shows that the consolidation model is rational and the analytic solution of pore water pressure is correct. The following conclusions can be made: 1) the influence of bubbles on the compressibility of pore fluid should be considered; 2) the effective stress would be influenced by bubbles, and the consolidation would depend on the compressibility of soil skeleton: the softer the soils are, the more distinct the influence of bubbles is; for normal clay, the influence of bubbles on the effective stress may be commonly neglected.

矿物质，不可少--硒Se

硒（Selenium），化学符号Se，原子序数34，原子量79，是人体必需微量元素。1817年由瑞典化学家贝采里乌斯（Berzelius）在研究硫酸厂铅室中红色淤泥性质时，发现的一种性质与碲相似的新元素，随即以希腊月亮女神塞勒涅（Selene）的名字定名为Selenium，使之与以罗马大地女神忒路斯（Tellus）之意命名的碲（Tellurium，Te）相对应。