电镀工业园区废水生物与化学两级处理工艺的研究

探讨了用环境生物技术与化学絮凝沉淀组合的工艺处理电镀园区两种电镀废水.试验结果表明:综合废水中的铜、铬、镍、锌、氰根的总去除率分别为99.9%、100%、99.9%、100%、49.5%(出水中除氰根为1.05 ms/L以外,其他重金属质量浓度都在0.1 mg/L以下);酸性含氰废水中的铜、铬、镍、锌、氰根的总去除率分别为99.8%、100%、98.1%、100%、84.0%(出水中镍、铜、氰的质量浓度分别为0.2、0.03、0.5 ms/L,铬和锌未检出);两种废水处理成本分别为4.39、4.46元/t.用该组合工艺处理综合电镀废水和含氰废水,既降低了处理成本,又使电镀园区废水能够达到新的国家排放标准.     

电镀废水综合治理实践

我厂电镀废水,由于镀种较多,有铬、铜、镍、锌、锡及少量贵金属金和银。对电镀废水的处理,原来只有两项:一为酸碱废水中和处理,一为含铬废水化学沉淀处理。二项废水的总排放量平均每天约二百吨左右。镀槽边未设槽边处理和逆流漂洗装置,不仅耗水量大,且重金属排放浓度较高。重金属综合去除率达86.6%,说明铬通过化学沉淀处理已完全达标。其它几种金属就成为我们这次电     

离子交换与气浮法联合处理电镀污水介绍

大港油田的电镀中心,有硬铬、装饰铬、镀锌和黑色金属氧化等工艺。生产过程中产生含有锌、铜、镍、铬等重金属离子及酸碱废水。从环保方面来说对铬离子要求很严,从经济效益来说,铬和镍的回收价值较高。因而我们对车间内含铬、含镍的废水采用离子交换处理。阳树脂再生液,含铜、含锌的废水与酸碱废水,地面水采用气浮法处理,从而做到有价值的铬镍得以回收,又     

ICP-OES测定电镀废水中铜、锌、铅、铬、镉、镍

电镀废水中含有铬、铜、镍等多种重金属离子等剧毒物质,对其快速准确监测非常重要,文章建立了ICP-OES同时测定电镀废水中Cu、Zn、Pb、Ni、Cr、Cd等金属元素的方法,对电镀水样进行分析并与原子吸收光谱法结果对比。     

电镀厂废水回收制备硫酸铜

电镀厂废水中含有大量的铜、镍以及少量铁、铬、锌、钴等,其中以镍、铬最毒,所以必须经过处理才能排放。如果将电镀废水液经过处理回收,制成硫酸铜,将为国家节省大量铜资源。     

香港的电镀废水处理

1 典型电镀工艺香港1984年6月底已有847家电镀厂,其中98%为中、小型电镀厂(操怍工人少于50人)。和其他工厂一样,电镀厂设在多层工业建筑中。镀种有铜、镍、铬、锌、金、银、锡、铅和铝氧化等,大多数电镀厂为镀铜、镍和铬。香港电镀厂各种镀液典型成份见表1。2 电镀废水治理电镀车间90%以上废水来自工件的漂洗。电镀     

电镀废水治理新工艺的研究

缓冲还原法治理电镀废水新工艺的实验结果表明，设备投资少，治理费用低，沉渣量少，对电镀含铬废水的铬及多镀种混合废水中锌、镍、铜、氰化物等均有显著的治理效果，是较理想的电镀废水治理工艺。尤其对中小电镀行业，具有很好的推广应用价值。     

不同织物结构的活性碳纤维对电镀废水处理的研究

采用不同织物的活性碳纤维吸附法处理含铬、镍、铜电镀废水.本文研究了单轴向、双轴向、多轴向活性碳纤维对电镀废水的渗透率及对金属离子的去除率.结果表明:当电解时间为30 min时,不同织物结构的活性碳纤维对铬离子、铜离子、镍离子去除率效果最好.双轴向活性碳纤维对电镀废水中的金属离子去除率最高,去除率达到95.92％.     

浅谈电镀企业镍在线回收系统

电镀废水含有大量铜、镍、铬等有价金属离子,直接排放对环境污染严重。文章介绍了某电镀厂采用离子交换—反渗透法对含镍废水进行在线回收,取得良好的效果。不仅符合国家的最新的电镀污染物排放标准,还可以回用到生产中,取得较好的经济效益和环境效益。     

电镀铬镍混合废水的絮凝处理

采用化学絮凝法对电镀含铬、镍废水进行了处理,确定了复合絮凝剂的种类和最佳配比,选择了最佳工艺条件,pH=8.70,搅拌t为30min,絮凝沉积t为12h,并对处理前后铬镍废水的质量浓度进行了检测。结果表明,铬的去除率为99.93%,镍的去除率为99.95%,处理后的废水中铬质量浓度降至0.12mg/L,镍质量浓度降至0.26mg/L,符合国家允许的排放标准,可作为电镀车间的循环用水。     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

我国聚碳酸酯工业发展概况

介绍我国聚碳酸酯生产能力和消费需求,对聚碳酸酯在信息工业中的应用作了简短介绍     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003     

气化给煤系统故障分析

气化给煤装置自投运以来,出现了气化煤仓堵煤、称重给煤机输送皮带因跑偏而损伤以及清扫装置故障频繁等问题,多次造成气化系统减负荷运行。通过对出现的各种问题进行分析,找到了产生这些问题的原因,并有针对性地采用配煤和改进清扫链等措施,使出现的问题得到了极大的改善。     

醋酸纤维素取代基分布与性质的关系

分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。     

Generalization of vdW type of equations of state

1 INTRODUCTIONBecause of importance of equations of state (EOS)in science and industry,hundreds forms of EOS havebeen presented since latter 19th century.It seems impossible to develop a general equation covering vari-ous kinds of EOS.But for cubic EOS,several generalequations have been reported already. Martin presented the first general equation whichis following p=RT/V-α(T)/(υ β)(υ γ) δ(T)/υ(υ β)(υ γ) (1) Kumar et a1.presented an equation called the most general form of a density-cubic or, alterna tively,volume-cubic mathematical equation,the form of which is as follows     

船舶柴油机涡轮增压器的清洗

采用喷射清洗剂的方法，清洗涡轮叶片积炭。