排序方式: 共有36条查询结果,搜索用时 31 毫秒
1.
露天深孔爆破环境污染的危害与防治 总被引:1,自引:0,他引:1
在全面分析爆破所带来的地震效应、噪声以及废气等污染的同时,结合某矿山生产爆破的具体情况,提出了些防治爆破环境污染的措施和建议。 相似文献
2.
3.
A new type of sponge iron sphere (NSIS) with 1-5 mm diameter, made of concentrated iron powder and possessed high activity and intension, was prepared by mini-pellet sintering integrated with H2 direct reduction. Static state experiment has been carried on to investigate the Cd2+ removal efficiency from wastewater by the NSIS and to explore the Cd2+ removal reaction kinetics. It was suggested that initial pH value and Cd2+ original concentration had significant influence on Cd2+ removal percentage. Cd2+ removal percentage decreased significantly with the increasing of Cd2+original concentration whether the original pH value be adjusted to 3.0 or without adjustment. The results showed that the Cd2+ removal process followed the first order reaction because the reaction order was from 0.803 to 0.996. The apparent reaction rate constant between Cd2+ and NSIS was from 0.0025 to 0.1000 (mg·L?1)1-n·min?1. Compared with SIS reduced by charcoal reduction, NSIS deoxided by hydrogen possessed higher activity, and could remove the same quantity of Cd2+ within a shorter period of time. 相似文献
4.
5.
四氯化碳的生产和使用,给人类带来了较大危害。为此,采用纳米铁粉这一新方法对其进行脱氯处理。试验以纳米级铁粉对四氯化碳的脱氯率为考察指标,选用L25(5^6)正交试验方案,考察了降解介质的初始pH值、纳米铁粉的质量、降解温度、摇床转速和脱氯时间5个影响因素。结果表明,pH值这一因素有极显著影响;在得出的纳米铁粉对四氯化碳脱氯的最佳工艺条件下,获得了99.5%的脱氯率,为有机氯化物脱氯开辟了一条新途径。 相似文献
6.
8.
Cytochrome P450s (CYPs) play a key role in the metabolism of a wide range of environmental xenobiotics and endogenous compounds. The expression and activity levels of CYPs can be elevated by a process of induction involving the activation of nuclear receptors. The effects of the ionic liquid 1-octyl-3-methylimidazolium chloride ([C8mim][Cl]) on the expression of cytochrome P450 members, including CYP1A1, CYP2E1, and CYP3A, as well as on aryl hydrocarbon receptor (AhR) and pregnane X receptor (PXR) in mouse mammary carcinoma cells (EMT6) were investigated by using quantitative real-time PCR in the present study. The results reveal that [C8mim][Cl]-exposure up-regulates the expressions of CYP1A1, CYP2E1, and CYP3A at mRNA level, suggesting that imidazolium-based ionic liquids can activate CYPs. Our results also suggest that [C8mim][Cl]-mediated CYP3A induction be PXR-dependent. This result may be beneficial to evaluating the environmental toxicity of imidazolium-based ionic liquids and investigating the metabolism of imidazolium-derivative drugs. 相似文献
9.
Junguo He Guangming Zhang Haifeng Lu 《Frontiers of Environmental Science & Engineering in China》2010,4(3):334-339
The conventional treatment method of soybean wastewater is expensive and generates waste sludge that requires further handling.
Purple nonsulfur bacteria (PNSB) wastewater treatment is a clean technology and can generate single cell protein while degrading
pollutants. Awild strain of PNSB, Rhodobacter sphaeroides Z08, was isolated from local soil and was used to treat soybean wastewater. To develop a cost-effective process, the work
was performed under natural conditions without artificial light, aeration, nutrients addition, or pH and temperature adjustment.
The results showed that the wild strain Rhodobacter sphaeroides Z08 could grow well under natural conditions. The growth curve showed two quick-growth periods and a turning point. The Z08
treatment of soybean wastewater was zero order reaction and COD reduction was 96% after 10 d. The major byproducts of the
process were C2–C5 organic acids, predominantly butyric acid. No alcohol was found in the effluent. The initial COD/bacterial-mass
ratio (F/M) had a significant effect on soybean wastewater treatment efficiency. When the initial F/M was lower than 10 mg-COD/mg-bacteria,
a sufficient amount of time to achieve 90% of COD reduction was only three days. The Z08 biomass yield was 0.28 g·g−1, and the bacterial protein content was 52%. 相似文献
10.
Sponge iron sphere (SIS), made of concentrated iron powder and possessed high activity and intension, was prepared through the process of palletizing, roasting and direct reduction by charcoal. The sponge iron sphere could remove most of Cd2+ from wastewater. The results showed the Cd2+ removal followed the first order reaction. Initial pH value played an important role in Cd2+ removal. With original initial pH, Cd2+ removal decreased to the minimum and then increased slightly with the rising of original concentration. The removal rate constant was ?0.1263 and ?0.0711 h?1, respectively, under the Cd2+ concentration of 50 and 200 mg/L. When the initial pH was adjusted to 3.0, the removal rate constant could increase to ?9.896 and ?4.351 h?1, respectively. The removal percentage almost reached to 100% when Cd2+ concentration was below 100 mg/L. While Cd2+ concentration was above 100 mg/L, Cd2+ removal percentage decreased slightly. In dynamic experiments, the column filled with sponge iron sphere exhibited favorable permeability. There was no sphere pulverization and conglutination between spheres. In contrast to the static state experiments, the Cd2+ removal percentage in dynamic state experiment was lower, and the removal Cd2+ quantity was 1.749 mg/g. 相似文献