MDEA脱碳装置腐蚀原因探讨

概述国内外 MDEA脱碳装置腐蚀机理 ,对永安智胜化工联合公司合成氨厂脱碳装置腐蚀原因作分析并提出防腐技术措施。     

多级A/O+生物脱氮技术处理高浓度制药废水

介绍了多级A/O+生物脱氮技术在高浓度制药废水处理工程中的应用。实际工程运行结果表明,处理出水pH值为6~9、COD≤500 mg/L、SS≤400 mg/L、氨氮≤35 mg/L、TN≤70 mg/L、TP≤8 mg/L,符合《污水综合排放标准》(GB 8978-1996)的三级标准,其中总氮、总磷达到《污水排入城镇下水道水质标准》(CJ 343-2010)的B级标准,氨氮达到《工业企业废水氮、磷污染物间接排放限值》(DB 33/887-2013)要求。该工程采用的点对点水解布水、生物脱氮、磁悬浮风机等新型技术和设备,具有较好的推广应用价值。     

废旧磷酸铁锂正极材料的硫酸熟化-水浸工艺研究

为提高磷酸铁锂中Fe、Li和P浸出率,同时实现高效去除Cu、Al和F,开发了硫酸熟化-水浸、铁粉置换除铜、化学沉淀-萃取二段除铝工艺。结果表明,在熟化时间2.5 h、熟化温度110 ℃、固液比4.0/1、水浸温度60 ℃及水浸时间2 h的最佳条件下,硫酸熟化-水浸工艺可将浓硫酸的使用量降至理论值的0.75倍,此时铁浸出率达95%以上,氟脱除率达74.4%; 铁粉置换除铜过程中,控制初始pH=1.2,铁粉加入量为理论值的1.2倍时,浸出液中残留的Cu²⁺浓度可降至4.9 mg/L以下; 采用化学沉淀-P204萃取二段除铝工艺,可将浸出液中Al³⁺浓度降至10 mg/L以下。     

Application of Taguchi method for the optimization of Fe2+ removal from contaminated synthetic groundwater using a rotating packed bed contactor

Malaysia contains elevated levels of iron in shallow groundwater in the range of 3–7 mg Fe/L compared to the USEPA safe limit of 0.3 mg Fe/L. Air Kelantan Sdn Bhd in Malaysia uses the ‘River Bank Filtration’ (RBF) technology to harvest hyporheic water. The RBF treatment removes the turbidity of the river water through the river bed acting as a filter, but is unable to remove the Fe from the harvested water. This work proposes a technology to reduce Fe concentration in the extracted water using granular activated carbon in a laboratory‐scale rotating packed bed contactor (RPBC). The Taguchi method was used for optimizing the operating conditions for the adsorption of Fe onto activated carbon in the RPBC system. Taguchi optimization results showed that a removal efficiency of 87% Fe from a 50 mg Fe/L concentration could be achieved by a RPBC at an initial pH of 6.5, a feed rate of 40 L/h, a rotating speed of 1600 rpm and a packing density of 357 kg/m³.     

Effects of elevated operating temperatures on methanol removal kinetics from synthetic kraft pulp mill condensate using a membrane bioreactor

The feasibility of biologically removing methanol from kraft pulp mill evaporator condensate was investigated, using a high temperature membrane bioreactor (MBR). Over the range of temperatures investigated (55–70°C), a mixed culture of methanol-utilizing microorganisms could be successfully developed, using synthetic condensate as a feedstock. A maximum specific methanol utilization coefficient of approximately 0.81 day⁻¹ occurred at an operating temperature of 60°C. Over 99% of the methanol was removed from the condensate at operating temperatures of 55 and 60°C. Above 60°C, the specific methanol utilization coefficient declined sharply, indicating that at high operating temperatures, the inactivating effect of temperature on the mixed culture of microorganisms must be considered. A relatively simple model was proposed and used to estimate the effect of high temperatures on methanol removal kinetics in an MBR over the range of temperatures investigated. The operating temperature also had a significant effect on the observed growth yield. At increasing operating temperatures, a larger fraction of the methanol consumed was converted to energy, reducing the observed growth yield.     

pH值对高铁酸盐复合药剂强化除藻的影响

探讨了ＰＨ值对高铁酸盐复合药剂强化混凝除藻效果的影响规律,分别考察了原水ＰＨ为５．０、７．０和１０．０条件下高铁酸盐复合药剂预氧化对除藻效率的影响规律。试验结果表明,对于微酸性原水（ＰＨ＝５．０）,高铁酸盐复合药剂强化混张除灌效果最好;随着提高,高铁酸盐复合药剂强化混凝除藻效果逐渐降低,但即使在高校ＰＨ值条件下（ＰＨ＝１０．０）仍然可取得明显的强化除藻效果。     

复合淹没式膜生物反应器脱氮除磷效能研究

介绍了膜生物反应器系统对氮、磷的去除效能及影响脱氮除磷效果的主要因素。试验结果表明,控制好膜生物反应器系统的运行条件,可以在去除有机物的同时脱氮除磷。     

木材变色的研究状况及发展趋势

阐述了木材变色问题的国内外研究状况及发展趋势,并给出了木材防变色方法和对已变色木材的除色方法.     

优化卤水精制工艺

在戈尔膜分离净化卤水的中试过程中，我们对卤水处理与卤水精制的质量、膜结垢的清洗技术进行了研究。结果表明。优化的卤水处理工艺可以防止膜结垢，使卤水精制质量达到优质标准，而膜的清洗也相对容易、周期相对延长；同时还研制了高效酸难溶垢清洗剂，以化学清洗法清除粘膜的硫酸钡垢。     

Machinability study of high speed steel for focused ion beam (FIB) milling process – An experimental investigation at micron/nano scale

Nowadays the attention is focused on machining of non-silicon materials for miniaturized devices. High speed steel (HSS) is a non-silicon tool material, which is used in metal cutting applications as well as in micro-medical applications. Focused ion beam (FIB) milling process is highly suited for the fabrication of micro tools and other micro devices manufactured from HSS material. This study investigates the machinability aspects of HSS for FIB milling process. Beam current, extraction voltage, angle of incidence, dwell time and percentage overlap between beam diameters are the FIB process parameters, which have been analyzed experimentally to optimize FIB milling process for maximum material removal rate and minimum surface roughness. Beam current is found as the most significant parameter for controlling the material removal rate and surface roughness.