一种改性生物填料强化生活污水脱氮效果研究

生物强化脱氮技术是城镇污水处理厂的重点关注之一.大量研究表明改性填料可以增强污水生物脱氮效果.本文制备了负载纳米MnO2的改性聚氨酯棉填料(聚氨酯/MnO2),构建分别以聚氨酯/MnO2和聚氨酯为填料的生物滤池对比系统(R1和R2);并进一步探究两个系统对生活废水的脱氮效果差异以及主要运行参数的影响作用.结果 表明,整...     

CLB-NTOD处理生活污水及中水回用的研究

首次建立了利用复合生物反应器(CLB)结合新型氧化消毒器(NTOD)处理污水的新方法,并对其进行了相关的应用研究。 CLB-NTOD联用技术处理生活污水及中水回用效果非常明显,出水水质不仅达到国家一级排放标准,而且优于杂用用水水质标准。     

前置反硝化-硝化生物滤池工艺物料平衡分析

针对前置反硝化(DN)-硝化(CN)生物滤池工艺进行碳(COD)、氮、磷平衡分析,建立了该工艺的物料衡算方法。分析结果表明:DN池中反硝化的碳源主要是甲醇,占DN池反硝化碳源量的70.8%。入流总氮中有13.7%通过CN池的同步硝化反硝化过程去除;入流COD中有46.4%通过CN池中异养菌的好氧氧化去除;入流磷总量约有75.9%被微生物利用。CN池中硝化过程耗氧量为29.0%,占供氧量的比例最大。     

通气对复合生物滤池处理晚年期渗滤液污染物效果影响及微生物群落结构分析

以上海老港垃圾填埋场填埋多年的陈垃圾和废弃多孔滤料为填料构建复合生物滤池处理晚年期垃圾渗滤液.研究了不同运行条件下复合生物滤池对晚年期渗滤液的处理效果,并对不同通气状况下功能微生物的数量、组成和群落结构,以及与处理效果之间的关系进行了分析结果表明：通气对污染物的去除率有较明显的提高,在复合生物滤池中部通气条件下(气固比...     

碳纳米管负载TiO2对1,2,4-三氯苯的光降解研究

碳纳米管负载TiO2复合光催化剂与纳米TiO2光催化剂对1,2,4-三氯苯的光催化降解效果,及降解动力学的研究结果表明,复合光催化剂比纳米TiO2有更好的光催化降解效果,经254 nm紫外光辐照60 min后,使用复合光催化剂的1,2,4-三氯苯降解了70%,而使用纳米TiO2为催化剂的1,2,4-三氯苯仅降解了51%...     

Preparation and characterization of a lipoid adsorption material and its atrazine removal performance

A novel adsorbent named lipoid adsorption material (LAM), with a hydrophobic nucleolus (triolein) and a hydrophilic membrane structure (polyamide), was synthesized to remove hydrophobic organic chemicals (HOCs) from solution. Triolein, a type of lipoid, was entrapped by the polyamide membrane through an interfacial polymerization reaction. The method of preparation and the structure of the LAM were investigated and subsequent experiments were conducted to determine the characteristics of atrazine (a type of HOC) removal from wastewater using LAM as the adsorbent. The results showed that LAM had a regular structure compared with the prepolymer, where compact particles were linked with each other and openings were present in the structure of the LAM in which the fat drops formed from triolein were entrapped. In contrast to the atrazine adsorption behavior of powdered activated carbon (PAC), LAM showed a persistent adsorption capacity for atrazine when initial concentrations of 0.57, 1.12, 8.31 and 19.01 mg/L were present, and the equilibrium time was 12 hr. Using an 8 mg/L initial concentration of atrazine as an indicator of HOCs in aqueous solution, experiments on the adsorption capacity of the LAM showed 69.3% removal within 6–12 hr contact time, which was close to the 75.5% removal of atrazine by PAC. Results indicated that LAM has two atrazine removal mechanisms, namely the bioaccumulation of atrazine by the nucleous material and physical adsorption to the LAM membrane. Bioaccumulation was the main removal mechanism.     

Perceptions, attitudes and interest of Swedish architects towards the use of wood frames in multi-storey buildings

Use of wood frames from sustainable forestry instead of non-wood frames in multi-storey buildings can reduce primary energy use and carbon dioxide emissions in construction. However, construction actors might have different perceptions towards wood frames than towards steel and concrete frames. Such perceptions may influence the actors’ decision to adopt wood frames. In this study we use a web-based questionnaire to assess Swedish architects’ perceptions, attitudes and interest towards steel, concrete and wood frames in multi-storey buildings (n = 412). Results indicate that the responding architects find concrete the most suitable frame material in buildings of 3-8 storeys, mainly because of the performance of concrete with regards to the engineering aspects (e.g. stability and fire safety) that were considered important in the choice of frame material. Although wood is considered the least suitable frame material, the overall attitude towards, and interest in, using wood is positive and related to the perceived environmental benefits of wood. This may derive from an increased discussion of and information about the environmental impact of buildings. Wood may be perceived as new and innovative while not considered as adequately proven as steel and concrete with regards to engineering aspects.     

涂装工艺组合/综合环境试验技术综述

本文介绍了组合/综合试验技术的发展历程及标准应用情况,论述了研究涂装工艺组合/综合试验技术的必要性,对试验方法的设计原则、设计方法及其技术难点进行了深入剖析,并介绍了几种试验结果相互关系的分析方法.     

超声粉碎-TOC/TN仪法直接测定污水处理厂废水中的总氮

污水处理厂废水经超声粉碎后,使用TOC/TN仪直接测定总氮.对仪器条件、进样方式、微波粉碎时间及加标回收率进行了探讨.相对标准偏差＜2.35％,测定结果与国标法一致,相对误差＜±1.3％,回收率为95.3％ ～97.8％.方法简便、快速、准确.     

电袋复合除尘技术的试验研究

通过对电袋复合除尘器性能试验及对喷吹清灰过程的研究,分析了荷电粉尘对滤料过滤性能的影响,探讨了高强滤料的研究开发及电袋复合除尘器的大型化技术等问题。