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Trimeric quaternary ammonium surfactants are newly developed surfactants, their widespread synthesis and utilization results in a great amount of scouring wasterwater of high COD, which is unmanageable. The present investigation aims to find a new type of organo-bentonites modified by the scouring wastewater and to treat the scouring wastewater at the same time. Results of adsorption experiments of phenol and formaldehyde by the modified bentonite show that, at the optimal ratio 24 % (W/V) of modified bentonite to scouring wastewater, the removal rate of phenol and formaldehyde by FTAT scouring wastewater modified bentonite is 3.53 times and 2.48 times higher than that of Na-bentonite, and the COD of treated scouring wastewater reduces to below 200 mg/L, meeting the second level of Standards for Discharge of Water Pollutants from the Ammonia Industry of China. 相似文献
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The kinetics of extraction and stripping of copper (Ⅱ) was investigated by the single drop technique with a new extractant N902 (a derivative of the salicylal-doxime) and the rate equations of extraction and stripping were derived, respectively. The apparent activation energies of extraction and stripping were estimated to be 20.14 kJ/mol and 30.0 k J/mol. 相似文献
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苏州河底泥重金属形态分析 总被引:2,自引:0,他引:2
Nine elements (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn) in sediment samples at 7 sites (Site 1-7) from Suzhou Creek in Shanghai were analyzed with the Community Bareau of Reference (BCR) (sequential extraction (SE)) protocol and simultaneously extracted metals (SEM)/acid volatile sulfide (AVS) procedure to assess the metal bioavailability and toxicology in this area. The results showed that the BCR extraction can be utilized as an additional tool with the AVS method for assessing the potential bioavailability and toxicity of metals in sediments. Pollution from S5 (Site 5) was more severe than from other sites, especially Pb, Cu and Zn. Among all the sites, more than 80% of the total concentration of Fe existed in the residual fraction, As, Cr, Mn also dominated in the residual fraction (more than 50%). While Cd, Ni and Zn (more than 35%) were mainly in the non-stable phase. Cu had a strong affinity with oxidizable phase and Pb varied from site to site. The SEM/AVS ratio was less than one in these sediments and results implied that the majority of Zn and Ni (〉 40%) were bound to AVS. In contrast, Pb, Cu and Cd were little bound to AVS due to their low ration of SEM-Pb, Cu, Cd to corresponding total concentration and relatively high Dorewater concentration. 相似文献
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1985年,中共中央在确定了经济工作是全党和全国人民一切工作的中心之后,正式发布了关于科技体制改革的决定,决定从我国实际出发,对科技体制进行坚决的、有步骤的改革。按照中共中央《关于科学技术体制改革的决定》的精神,推动企业成为R&D经费投入及其R&D活... 相似文献
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1IntroductionIn recent years,tri meric quaternary ammoniumsur-factants,which have three hydrophobic and three hy-drophilic groups connected bytwo spacer chains,havebeen developed[1-5].The tri meric surfactants appearunique physicochemical properties such … 相似文献
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上海郊区快速工业化的土地利用及碳排放响应 ——以张江高科技园区为例 总被引:3,自引:0,他引:3
高速发展的工业化进程加快了大城市郊区传统农业用地向工业及其他非农用地的转变,进而影响整个区域的碳源/碳汇和碳排放。基于上海张江高科技园区1989年、2000年、2006年和2009年等四期土地利用数据,定量分析近20年来该区域土地利用变化及空间分异特征,在此基础上探讨土地利用变化与碳排放的响应关系。结果表明:①张江高科技园区在工业化进程中,各种土地利用方式的变化及其相互转化程度非常剧烈,89.3%的农业用地萎缩,其中转变为工业用地和居住用地等为主导变化类型,占所有变化面积的27.98%和19.01%;②区域工业用地扩张所带来的碳排放量显著增加,2009年碳排放量为82.018万t,而由于耕地等碳汇面积持续减少,碳吸收量仅为0.569万t,由此造成的碳赤字达906km2,相当于园区面积的36.24倍,是整个浦东新区面积的1.72倍 相似文献
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An expanded granular sludge bed (EGSB) reactor inoculated with anaerobic granular sludge was started up with its COD removal performance, self-balancing of pH, biogas production rate and characteristics of the granular sludge during the start-up period being investigated. The results indicated that the EGSB reactor can be started up successfully in 27 d by increasing the organic loading rate rapidly. The removal efficiency of COD was maintained above 93% with influent COD concentration of 25 000 mg/L and OL... 相似文献