煤燃烧过程中微量元素铬、铅的迁移转化规律研究

通过化学逐级提取法等手段,研究了煤中铬、铅在燃烧过程中的迁移转化规律及其环境稳定性,掌握了其在燃烧产物中的形态和分布,为开展燃煤电厂灰渣中重金属污染的防治工作提供了依据。     

三峡库区消落带土壤中重金属铬调查与分析

报道了三峡库区长江干流及小江支流消落带土壤重金属铬含量背景值调查结果。结果表明目前土壤未被重金属铬污染。     

铬的浸出毒性试验方法研究

以铬为分析指标,探讨了钻井废充泥浆在不同的提取剂、没的提取时间、不同的固液比以及不同的提取方式下铬的浸出毒性大小,提出了适合评价钻井废充泥浆中铬的浸出毒性的试验方法。     

微量元素对柠檬酸废水发酵回用的影响

本文研究了微量元素Cu2 、Fe2 、Zn2 、Mn2 、Mg2 和PO3-4 对柠檬酸中和废水发酵的影响。在经过“碱沉淀—离子交换法 (AIE法 )”处理后的废水培养基中分别加入 1× 1 0 -8g/mlMn2 、1× 1 0 -7g/mlZn2 、1× 1 0 -6 g/mlMg2 、1× 1 0 -5g/mlCu2 和 1 .5× 1 0 -2 g/mlPO3-4使产酸依次提高 2 .8%、9.0 %、1 0 .5 %、8.3%、7.2 %和 3.4 %。Fe2 的加入降低了柠檬酸产量。     

A novel biosorbent: characterization of the spent mushroom compost and its application for removal of heavy metals

The spent mushroom compost of Lentinus edodes was used as a biosorbent for adsorbing cadmium, lead and chromium from solutions under batch conditions for the first time. Titration of the biomass revealed that it contained at least three types of functional groups. The Fourier transform infrared spectrometry showed that the carboxyl, phosphoryl, phenolic groups were the main groups. The simulated values of pK, and molar quantity were 5.00 and 0.44 mmol/g, 7.32 and 1.38 mmol/g, 10.45 and 1.44 mmol/g, respectively. The biosorption ability increased with pH in acid condition. When 10 mg/L biomass dosage was added in, there was no significant increment of metal uptake. The maximum uptake estimated with the Langmiur isotherm model were 833.33 mg/g for Cd（ Ⅱ ）, 1000.00 mg/g for Pb（ Ⅱ ） and 44.44 mg/g for Cr（ Ⅲ ）, respectively. All the results showed that vast potential sorption capacity was existed in the biomass for adsorbing these three kinds of metals studied.     

微波辐照解毒铬渣影响因素的研究

对含铬废渣微波辐照解毒新方法进行了基础性研究,主要包括铬渣和还原剂--煤在微波场中的升温行为,操作条件(微波功率、辐照时间、配比、煤渣质量)对铬渣中Cr6+转化率的影响.应用正交试验法对影响因素进行了分析.研究结果表明:铬渣和煤均能吸收微波能,且煤是很好的碳质还原剂;微波功率、辐照时间、配比的提高有助于转化率的提高;初始w(C)达20%后,反应速率基本不受含碳量的影响;煤渣质量的增加对转化率有一定影响,但不显著.      

铬渣的高温-快冷-等温转变固化研究

采用高温-快冷-等温转变对铬渣进行固化处理,通过调整配料成分确定最高固化温度,使铬渣的处理量最大且软化温度最低,以利节能和实际工业应用。结果显示,混合物以含铬渣35％～40％、粘土35％～45％、河沙10％、粉煤灰10％时,软化温度最低为1120～1125℃,固化产物经过标准毒性浸出,所测定的浸出液六价铬离子浓度低于0．8mg／L。该固化方法具有操作流程较短、铬渣处理量大等优点,可成功固化其中的六价铬离子。其固化原理是铬渣中铬离子在高温下迁移至相界面,在合理的冷却过程中稳定存在于相界面,而不易被浸出。     

服务于安全

巴固工贸(上海)有限公司位于上海市外主桥保税区港澳路389号,是一家由法国巴固集团与上海外高桥保税区新发展有限公司,于1996年2月合资建立了加工贸易企业,公司的注册资金为150万美元。主要加工、经营个人劳动保护产品,是中国境内唯一的中外合资专营劳动保护用品的公司。 作为外方投资方的法国巴固集团创立于1975年,经历了近30年的开拓、发展,法国巴固集团已确立了全球PPE行业的龙头地位,成为全球最大的个人保护用品的生产供应商之一,产品达3000余种。集团在法国本土、欧洲及美洲都设有分支机构;销售和服务网络分布于全球每个角落,年销售额达10亿美元。     

工作量变化的生产性噪声测定及综合评价

通过对样板钳工噪声的测定及分析,探索工作量不确定的非稳态,间断噪声的表达方式,方法：调查样板钳工的主要品怕源及年工时,测定相应噪 的日等效连续A声级,根据能量平衡原理计算年等效连续A声组（简称LeqA,Y),进行主要噪声的频谱分析,结果：该工种的主要品声源是平铁,切割,锉磨,其LeqA,d分别是95．7,98．2,90．4;计算LeqA,y为92．1,切割,锉磨属高频噪声,结论：LeqA,y是工作量不确定的非稳态噪声简单,实用的综合评价指标。     

Mechanism of calcium mitigating membrane fouling in submerged membrane bioreactors

Two parallel membrane bioreactors (MBRs) were operated under different calcium dosages (168.5, 27 mg/L) to gain a better understanding of the mechanism of retarding membrane fouling by adding calcium. The results showed that the particle size of sludge flocs increased and the particle size distribution tended to be narrow at the optimum dosage (168.5 mg/L). Calcium was effective in decreasing loosely bound extracellular polymeric substances (LB-EPS) in microbial flocs and soluble microbial products (SMP) in the supernatant at the dosage of 168.5 mg/L by strengthening the neutralization and bridging of EPS with flocs. Furthermore, the amount of COD_S and COD_C decreased in both the mixed liquor and the fouling cake layer on the membrane surface. In order to compare the filtration characteristics of cake layers from the MBRs with the two calcium dosages, the specific cake resistance and the compressibility coefficient were measured. The specific cake resistance from the MBR with optimum dosage (168.5 mg/L) was distinctly lower than that with low dosage (27 mg/L). The compressibility coefficient of the cake layers under two dosages were respectively attained as 0.65, 0.91. Scanning electron microscopy (SEM) and three-dimensional confocal scanning laser microscope analysis (CLSM) images were utilized to observe the gel layer directly.