武汉三金潭卵形消化池新施工方法

介绍了一种大型卵形消化池的新施工方法,不采用脚手架支撑,而采用自立组合框架模板体系、后嵌入式模板,并辅以中心塔、辐射梁的定位支撑整体系统;并概要介绍了该施工系统设计分析要点。     

大型卵形消化池结构数值分析

根据薄壳理论,应用ANSYS软件,采用参数化建模的方法对卵形消化池在静力荷载作用下的内力进行数值分析。通过对容积相同、池体尺寸按一定规律变化的卵形消化池的内力和表面积的比较,总结出在满足工艺要求下受力最为合理的结构形状,为初步设计阶段池型的选择以及主体尺寸的确定提供依据和建议。     

The anaerobic degradation of detergent range fatty alcohol ethoxylates. Studies with C-labelled model surfactants

The anaerobic degradation of fatty alcohol polyglycol ethers was studied in a model sludge digester employing stearyl alcohol ethoxylate which was ¹⁴C-labelled either in the alkyl or in the heptaglycol chain. After 4-weeks' incubation of the ¹⁴C-compounds at 35°C in the presence of raw sludge as additional digestible substrate more than 80% of the initial radioactivity was found as methane and carbon dioxide. In addition, the major part of radioactivity in the digested sludge, corresponding to nearly 10% of added ¹⁴C, was attributable to biomass so that ultimate degradation of the two model surfactants amounted to more than 90%. Analysis of the small fraction of radiolabelled metabolites in the sludge supernatant allowed conclusions with regard to the anaerobic degradation route of linear alcohol ethoxylates. After primary biodegradation of the surfactant molecule by scission into the alkyl and poly(ethylene glycol) moieties the further biodegradation of the latter seems to proceed as under aerobic conditions, i.e. via oxidative or hydrolytic depolymerization steps. Eventually, ultimate biodegradation of the obtained monomers (C₂-units) leads to the formation of the gaseous end products.     

某蛋形消化池模板钢框架的结构计算分析

本文针对某污水处理厂工程中的蛋形消化池模板结构体系进行计算分析,包括空间模板钢框架体系的建立、各施工阶段的结构计算分析等,本文的研究对类似工程模板体系的应用具有一定参考价值。     

沼气池在农村污水处理中的应用

简述了农村排水的现状,介绍了污水处理的方法,探讨了沼气在农村污水处理中的应用,指出厌氧净化污水池迎合了我国小城镇建设和发展的需要,在不断对其研究和改进的同时应大力推广应用。     

基于环粱作用的卵形消化池内力分析

卵形消化池作为污泥处理的核心构筑物，因其良好的刮泥效果及优良的结构形式而得到广泛关注。环梁在卵形消化池结构体系中起到了支撑和约束作用，承上启下，通常设置在上部壳体拉力与环梁下部壳体拉力之比接近1．0的位置处，本文建议初步设计时可取总池高的1／3-1／4，通过不断的工程积累优化消化池的受力体系。     

结合实例浅谈软土地基中蛋形消化池的基础设计

软土地基中的蛋形消化池基础设计,通常采用大直径的钻孔灌注桩。本文所述大直径预应力混凝土管桩首次在蛋形消化池中成功应用的工程实例,表明该类桩型能减少工程造价、缩短施工周期、控制构筑物的沉降变形。本文主要论述了软土地基中蛋形消化池采用大直径预应力混凝土管桩设计时应注意的要点,为类似设计提供参考。     

卵形消化池基坑开挖防管涌的施工方法

某工程在黄海高程-10.2~-10.8 m处有承压水存在,由于挖土卸荷作用,使基底上覆土重力小于承压水浮力,为防止基坑因突涌而失稳,对基底采用了灌浆固结施工措施,保证了基坑的稳定并缩短了工期。     

基于模糊自整定PID的置换蒸煮锅温差控制系统的设计

置换蒸煮过程中蒸煮锅内温度控制是一个具有严重时滞性、时变性和非线性系统,且药液在蒸煮锅内循环时易产生温度梯度,为保证锅顶部和底部药液温度均匀一致,采用常规的温差-流量串级PID控制器难以取得满意的控制效果。通过对蒸煮药液循环加热后回流至蒸煮锅顶部和底部过程机理的分析,依据串级控制、模糊控制和PID控制的特点,将三者有机地结合起来提出一种模糊自整定PID串级控制系统,应用Matlab仿真比较表明,模糊自整定PID串级控制的动态响应曲线更好,超调量小,抗干扰能力强。     

Anaerobic digestion of sewage sludge in an anaerobic fixed bed digester

The anaerobic digestion of sewage sludge in conventional reactors requires a hydraulic retention time of around 20 days. By using a fixed bed reactor the hydraulic retention time was reduced to 3–7 days. Recirculation increased the removal of organic matter in this system.