开滦东欢坨矿综掘工作面防尘技术应用

综掘工作面的防尘是煤矿安全生产的重要工作,针对综掘工作面的特点,采取有效的防尘技术,预防尘肺病的发生,为员工创造良好的作业环境,提高工作效率,为煤矿安全生产保驾护航。     

Electricity generation and brewery wastewater treatment from sequential anode-cathode microbial fuel cell

A sequential anode-cathode double-chamber microbial fuel cell (MFC), in which the effluent of anode chamber was used as a continuous feed for an aerated cathode chamber, was constructed in this experiment to investigate the performance of brewery wastewater treatment in conjugation with electricity generation. Carbon fiber was used as anode and plain carbon felt with biofilm as cathode. When hydraulic retention time (HRT) was 14.7 h, a relatively high chemical oxygen demand (COD) removal efficiency of 91.7%–95.7% was achieved under long-term stable operation. The MFC displayed an open circuit voltage of 0.434 V and a maximum power density of 830 mW/m3 at an external resistance of 300 ?. To estimate the electrochemical performance of the MFC, electrochemical measurements were carried out and showed that polarization resistance of anode was the major limiting factor in the MFC. Since a high COD removal efficiency was achieved, we conclude that the sequential anode-cathode MFC constructed with bio-cathode in this experiment could provide a new approach for brewery wastewater treatment.     

城市扩建中拆迂各方行为的经济学解释

拆迁问题成为时下广泛关注的问题,而群众上访事件又以拆迁最具代表性,因此,对城市建设中拆迁各方行为做出经济学土的解释,并找出存在于各类拆迁纠纷中的共同的制度性诱因。希望这一探讨对解决城市化过程中不断产生的越来越多的拆迁纠纷有所帮助。     

洗氯水除砷及砷渣富集工艺研究

含砷洗氯水可采用盐酸中和,石灰和硫酸铁两段除砷的方法处理,溶液中的砷能降至0.5mg/L以下,达到国家规定的工业污水砷排放标准。一段砷渣可采用二次富集方法提高渣含砷。     

Research on the methods of detecting and removing slide valve failure

Various ways for detecting slide valve failure are discussed in the paper. Specifically, a new method for detecting slide valve sticking state is first presented. The method does not depend on any special sensor and is only based on the detection of oscillation current wave within a valve coil. Results of theoretical analysis and experimental research are given for comparison. In order to remove a slide valve sticking online, a concept and method of “electrical hammer” is introduced. At last, an application example of the methods is discussed. In fact, it is an electro-hydraulic turbine system with failure diagnosis, fault-tolerant and trouble removal functions. Project (59775003) supported by NSFC     

硫酸铵干燥器湿式除尘技术的研究与应用

本文介绍了安钢焦化厂硫酸铵的生产现状,详细的阐述了振动式流化床干燥器尾气除尘的原理和方法,以及在生产实践中的应用情况。     

羟基磷灰石吸附性能的研究进展

羟基磷灰石是人体和动物骨骼的主要无机矿物成分,具有良好的生物相容性和生物活性,是较好的生物材料。随着研究工作的深入进行,研究人员发现羟基磷灰石具有较强的吸附作用,在吸附并回收利用地方饮用水中过量的氟离子和工业废水中的重金属离子方面具有非常广阔的应用前景。文章综述了羟基磷灰石吸附性能的应用研究近况,并对羟基磷灰石的发展前景进行了展望。     

城市污水深度处理技术试验研究

对城市污水处理厂的二级出水进行深度处理和回收利用,是解决城市和工业用水短缺的有效途径．本文结合二级出水的水质现状,以回用的目的对深度处理流程作了简要的介绍,并从生物滤池的生物挂膜、混凝、沉淀、过滤、脱氮除磷等方面系统地进行了研究探讨,实验证明此流程处理二级出水能使处理水质达到污水回用的标准．     

模拟烟气中炭质颗粒的汞吸附模型

根据残炭和活性炭的穿透吸附试验数据,提出了残炭吸附等温线的数学模型.通过所取微元内气相汞和固相汞的总量平衡关系建立相关微分方程组,并运用Matlab软件结合Runge-Kutta过程推导出适用模型.穿透试验结果表明在与电厂烟气汞浓度相近的低汞浓度条件下(<0.3mg/m3),残炭的吸附等温线符合Freundich理论的Ⅱ型等温线,而活性炭的数据则明显具有Langmuir关系,即属于Ⅲ型等温线.运用Matlab软件将实验数据对修正模型进行拟合计算,经过统计分析,出口汞浓度数据方差不超过0.81,表明在允许的误差范围内,测试数据和模拟结果令人满意.该模型对汞吸附脱除效率预测和炭质吸附剂的汞吸附富集机理研究有重要意义.     

Sorption of ammonium and phosphate from aqueous solution by biochar derived from phytoremediation plants

The study on biochar derived from plant biomass for environmental applications is attracting more and more attention. Twelve sets of biochar were obtained by treating four phytoremediation plants, Salix rosthornii Seemen, Thalia dealbata, Vetiveria zizanioides, and Phragmites sp., sequentially through pyrolysis at 500 °C in a N2 environment, and under different temperatures(500, 600, and 700 °C) in a CO2 environment. The cation exchange capacity and specific surface area of biochar varied with both plant species and pyrolysis temperature. The magnesium(Mg) content of biochar derived from T. dealbata(TC) was obviously higher than that of the other plant biochars. This biochar also had the highest sorption capacity for phosphate and ammonium. In terms of biomass yields, adsorption capacity, and energy cost, T. dealbata biochar produced at 600 °C(TC600) is the most promising sorbent for removing contaminants(N and P) from aqueous solution. Therefore, T. dealbata appears to be the best candidate for phytoremediation application as its biomass can make a good biochar for environmental cleaning.