转运站框架式厂房的爆破拆除

合山电厂转运站待拆五层钢筋混凝土框架式厂房西侧与被保护的引风机房相隔仅 0 3m ,北侧与工具房相连 ,南侧与需要保护的油池相邻。爆破切口布置在二层 ,并把最后一排柱的爆破部位提高到引风机房顶部以上 0 5m处 ,避免了后坐对引风机房的影响。通过预处理 ,将厂房与工具房分离。架设防护结构 ,阻挡飞石 ,保护了油池。文中介绍了爆高和爆破参数的选择、预处理、起爆破网路设计和安全防护措施。     

Electrochemical pre-treatment of effluents containing chlorinated compounds using an adsorbent

Electrochemical pre-treatment of industrial wastewater to remove refractory and/or toxic organic components, making them more amenable to biological treatment, is likely to be more cost-effective than using a physical or chemical process for complete organic removal. This paper demonstrates the use of a carbon-based adsorbent material that preferentially removes chlorinated organic compounds. Electrochemical regeneration of the adsorbent is shown to be a quick, easy and cheap process, because the adsorbent is both highly electrically conducting and non-porous. High regeneration rates over a number of cycles were obtained by passing a charge of 25 C g⁻¹ through a bed of adsorbent particles, at a current density of 20 mA cm⁻² for 10 min. The energy required to remove a kg of COD from an industrial wastewater was calculated to be 27 kWh.     

金属型铸造铸态铁素体球墨铸铁的试验研究

介绍金属型获得铸态铁素体球铁的工艺及其铸态组织与性能 ;实验发现 ,采用铝和石墨对铁液进行预处理、含铋孕育剂的瞬时孕育 ,对增加石墨球数和防止表面白口的形成作用十分显著。铸态组织中铁素体含量大于 98%,石墨球细小、圆整 ,平均直径12 μm,单位面积的球数 90 0个 /mm2 以上 ,球化率达 90 %以上。铸态机械性能达到QT45 0 15。     

以浸没式超滤膜为核心的短流程净水工艺的应用与思考

以浸没式超滤膜为核心的短流程净水工艺自问世以来受到业界的广泛关注.该工艺为净水厂建设和改造提出了一条将预处理、超滤、浓水回收、污泥浓缩、排泥等工序集合在一个构筑物中运行的全新技术路线,有着广阔的应用前景.从该工艺各个环节的特点出发,进行从设计到运行的多角度思考,提出了一些自己的理解,抛砖引玉与大家共同探讨.     

高浓度香料香精废水处理工程设计

香料香精废水中含有苯、酚、醇、胺、醛类及脂类、油类等物质,硫酸盐含量高,水量、水质变化大。设计采用隔油—气浮—微电解—催化氧化预处理工艺,UASB—两级A/O生化工艺,混凝/沉淀—砂滤深度处理工艺。运行结果表明:当高浓度原水CODCr高达18 073 mg/L时,出水CODCr仍在100 mg/L以下,其他指标均达到《污水综合排放标准》(GB 8978—1996)一级标准。     

焦炉煤气热值仪预处理系统的改进

焦炉煤气含有较多难以净化的杂质,对分析焦炉煤气的在线分析仪预处理系统的净化能力要求较高.分析了CM6G热值仪检测系统在韶钢焦炉煤气热值检测中取样及预处理系统存在的问题,并探讨了预处理系统部件的改进措施.经实验表明,改进后的预处理系统净化效果大大加强,满足仪表在线连续检测的要求.     

Optimization of sugar release from banana peel powder waste (BPPW) using box-behnken design (BBD): BPPW to biohydrogen conversion

Optimization of pre-treatment conditions has been achieved for total sugar release from banana peel powder waste (BPPW) feedstock modelled through a three-level Box-Behnken design (BBD) of the response surface methodology (RSM). A series of various runs were executed at varied acid (H₂SO₄) concentrations (0.05%–0.15% v/v), incubation periods (1 h–3 h) in water bath at 95 °C and alkali (NaOH) concentrations (0.05%–0.15% v/v) according to the Box-Behnken design (BBD). From RSM the significant values of incubation period, acid concentration and alkali concentration were obtained as 3 h, 0.095% v/v, and 0.05% v/v respectively. The maximum total sugar release was reported as 5243.62 μg/ml which was highly close to the predicted value (5010.07 μg/ml). The model P- value (0.001), R-sq (98.26%), (adj) R-sq (95.14%) and (pred) R-sq (79.56%) obtained through ANOVA justified the results. The mutual impact of alkali and incubation period had the highest effect on total sugar release from dried banana peel powder, followed by mutual impact of acid and incubation period based on ANOVA (Analysis of Variance) results.Under optimized conditions of pre-treatment six different substrate concentrations (1%, 3%, 5%, 7% and 9% w/v) of BPPW was hydrolyzed and used to obtain volumetric bio-hydrogen evolution. The highest cumulative volumetric bio hydrogen gas 43 ml H₂/30 ml media was achieved at 5% w/v of pretreated BPPW. The substrate concentration above 5% w/v resulted in lowered fermentation process owing to product and substrate inhibition.     

RSA用于手机用户的数字签名方法

本文从利用中国剩余定理对RSA签名算法的简化计算、预处理及对多素数RSA算法的证明和讨论等角度出发，在提高手机用户数字签名的速度方面作了探讨，以供参考。另外，在进一步提高数字签名的鉴别性和速度方面提出了一些建议和展望，希望能起到抛砖引玉的作用。     

The fate of Transparent Exopolymer Particles (TEP) in integrated membrane systems: Removal through pre-treatment processes and deposition on reverse osmosis membranes

The abundance of Transparent Exopolymer Particles (TEP) in surface waters has been unnoticed for many years until recently as a potential foulant in reverse osmosis systems. Recent studies indicate that TEP may cause organic and biological fouling and may enhance particulate/colloidal fouling in reverse osmosis membranes. The presence of TEP was measured in the raw water, the pre-treatment processes and reverse osmosis (RO) systems of 6 integrated membrane installations. A spectrophotometric method was used to measure TEP in the particulate size range (>0.40 μm) and was extended to measure TEP in the colloidal size range (0.05–0.40 μm). Ultrafiltration pre-treatment applied in 4 plants, totally removed particulate TEP while microfiltration systems (2 plants) and coagulation/sedimentation/rapid sand filtration systems (3 plants) partially removed this fraction. None of the pre-treatment systems investigated totally removed colloidal TEP. Biopolymer analysis using LC–OCD showed consistency between colloidal TEP and polysaccharide removal by UF pre-treatment and further verified the presence of TEP in the RO feedwater. TEP deposition in the RO system was determined after measuring total TEP concentrations in the RO feed and concentrate. The TEP deposition factors and specific deposition rates indicate that TEP accumulation had occurred in all plants investigated. This observation was verified by an autopsy of RO modules from two RO plants. Further improvement and verification of the (modified) TEP method, in particular the calibration, is necessary so that it can be employed to investigate the role of TEP in the fouling of RO systems.     

Pre-treatment and ethanol fermentation potential of olive pulp at different dry matter concentrations

Renewable energy sources have received increased interest from the international community with biomass being one of the oldest and the most promising ones. In the concept of exploitation of agro-industrial residues, the present study investigates the pre-treatment and ethanol fermentation potential of the olive pulp, which is the semi solid residue generated from the two-phase processing of the olives for olive oil production. Wet oxidation and enzymatic hydrolysis have been applied aiming at the enhancement of carbohydrates' bioavailability. Different concentrations of enzymes and enzymatic durations have been tested. Both wet oxidation and enzymic treatment were evaluated based on the ethanol obtained in a subsequent fermentation step by Saccharomyces cerevisiae and Thermoanaerobacter mathranii. It was found that a four-day hydrolysis time was adequate for a satisfactory release of glucose and xylose. The combination of wet oxidation and enzymatic hydrolysis resulted in the glucose and xylose concentration increase of 138 and 444%, respectively, compared to 33 and 15% with only enzymes added. However, the highest ethanol production was obtained when only enzymic pre-treatment was applied, implying that wet oxidation is not a recommended pre-treatment process for olive pulp at the conditions tested. It was also showed that increased dry matter concentration did not have a negative effect on the release of sugars, indicating that the cellulose and xylan content of the olive pulp is relatively easily available. The results of the experiments in batch processes clearly emphasize that the simultaneous saccharification and fermentation (SSF) mode is advantageous in comparison with the separate hydrolysis and fermentation (SHF) mode concerning process contamination.