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101.
铝电解槽废旧阴极炭块的处理 总被引:1,自引:0,他引:1
实验研究了铝电解工业的废渣——废旧阴极炭块的浮选处理。考查了浮选条件,以及不同捕收剂的浮选结果。 相似文献
102.
采用电解法处理化学镀镍废液,考察了pH值、电流密度、温度、循环、电解时间等因素对镍离子回收率和COD去除率的影响,并重点研究了电解参数对化学镀镍废液中不同物质的COD降解效果的影响。结果表明,酸性条件有利于COD的降解,碱性条件有利于化学镀镍废液中镍的回收,当镍的回收率达到98.7%时,COD的去除率可达61.91%。 相似文献
103.
Agricultural intensification within agroforestry: The case of coffee and wood products 总被引:1,自引:0,他引:1
Compared to the environmental and conservation value as refuges for biodiversity, less is known about the social and economic value of shaded coffee systems. The agroforestry system can serve as a source of non-coffee products for diverse purposes. This study focuses on the role of shade trees in smallholder coffee farms, examining the wood products derived from the shaded coffee system. Data presented from surveys with 185 growers in Peru and 153 growers in Guatemala show that the consumption and sale of all non-coffee products account for a fifth to a third of the total value realized from the agroforestry system. Fuelwood and construction materials account for much of this value. Differences seen between countries can be traced to agricultural intensification – the degree to which the coffee agroforestry system is “technified” (i.e., managed with a reduced shade tree cover and diversity, high-yielding cultivars, agrochemical inputs, etc.) – as well as the relative demand for wood resources and farmers’ access to natural forest systems. 相似文献
104.
以硝酸浸取废无汞碱性电池极性材料,再加入硝酸铁及蔗糖生成前驱体,最后通过焙烧制得锰锌铁氧体磁性纳米颗粒。优化了酸浸和焙烧条件,采用FTIR和DTA-TG技术研究了前驱体的形成和热解过程,采用XRD、FTIR、TEM技术和振动样品磁强计对锰锌铁氧体进行了表征。结果表明:废无汞碱性电池极性材料酸浸的最佳条件为H_2O_2加入量3%(w)、液固比10 mL/g、稀硝酸浓度4 mol/L、浸取温度40℃,该条件下浸取10 min锰和锌的浸出率均可达100%;所得前驱体为葡萄糖酸盐,其最佳焙烧条件为焙烧温度450℃、焙烧时间2 h;最佳条件下所得锰锌铁氧体为尖晶石型Mn_(0.5)Zn_(0.5)Fe_2O_4,其颗粒为球形、大小均匀,且磁性能优良。 相似文献
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106.
S. Aalfin Emmanuel Jangyeon Yoo Eok-Jo Kim Jae-Soo Chang Young-In Park 《Journal of environmental science and health. Part. B》2017,52(11):802-811
Spent coffee grounds (SCG), poultry manure, and agricultural waste-derived biochar were used to manufacture functional composts through microbial bioaugmentation. The highest yield of tomato stalk-based biochar (40.7%) was obtained at 450°C with a surface area of 2.35 m2 g?1. Four pilot-scale composting reactors were established to perform composting for 45 days. The ratios of NH4+–N/NO3?–N, which served as an indicator of compost maturity, indicate rapid, and successful composting via microbial bioaugmentation and biochar amendment. Moreover, germination indices for radish also increased by 14–34% through augmentation and biochar amendment. Microbial diversity was also enhanced in the augmented and biochar-amended composts by 7.1–8.9%, where two species of Sphingobacteriaceae were dominant (29–43%). The scavenging activities of 2,2-diphenyl-1-picrylhydrazyl (DPPH) were enhanced by 14.1% and 8.6% in the fruits of pepper plants grown in the presence of the TR-2 (augmentation applied only) and TR-3 (both augmentation and biochar amendment applied) composts, respectively. Total phenolic content was also enhanced by 68% in the fruits of the crops grown in TR-3. Moreover, the other compost, TR-L (augmentation applied only), boosted DPPH scavenging activity by 111% in leeks compared with commercial organic fertilizer, while TR-3 increased the phenolic content by 44.8%. Composting facilitated by microbial augmentation and biochar amendment shortened the composting time and enhanced the quality of the functional compost. These results indicate that functional compost has great potential to compete with commercially available organic fertilizers and that the novel composting technology could significantly contribute to the eco-friendly recycling of organic wastes such as spent coffee grounds, poultry manure, and agricultural wastes. 相似文献
107.
Mehmet Mahramanlioğlu İrfan Kizilcikli İ. Özlem Biçer Melda Tunçay 《Journal of environmental science and health. Part. B》2013,48(2):187-200
Abstract The removal of 2, 4‐D (2, 4‐ dichlorophenoxyacetic acid) from aqueous solutions by activated spent bleaching earths (SBE) was studied at 20 °C. Experiments were performed as a function of time, initial concentration, dose and particle size of the adsorbent. The Langmuir and Freundlich adsorption equations were fitted by the adsorption data obtained. The values of Langmuir and Freundlich constants were determined. The adsorption kinetic was found to follow Lagergren equation. Both the boundary layer and intraparticle diffusion played important roles in the adsorption rate of 2, 4‐D. As the size of the adsorbent increased, the time to reach equilibrium increased but adsorption capacity decreased. 相似文献
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110.
阐述了广州市白云区南溪化工厂开发出的一套国内首创的对线路板蚀刻废液进行大规模集中资源化处理的零排放处理新工艺,这套新工艺采用重力分选的方法将在固相条件下生成的氧化铜分离出来,克服了原有工艺的缺陷,达到了理想的分离效果,使废液中所有的成分能够在较低的处理成本下全部分离回收,完全无三废排出,达到了清洁生产的要求。 相似文献