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Barbara Witthuhn Peter Klauth Timea Pernyeszi Harry Vereecken Erwin Klumpp 《Water, Air, & Soil Pollution: Focus》2006,6(3-4):317-329
The adsorption and degradation of chlorobenzene on partially modified organoclays and by the autochthonous microorganism Rhodococcus
B528 were studied by means of the batch technique. Organoclays were prepared from Na-montmorillonite (MM) by using dodecyltrimethylammonium
(C12) and dioctadecyldimethylammonium (2C18) bromides. The degree of modification was 35 (2C18-35-MM) and 89% (C12-89-MM) of the cation exchange capacity of MM. The adsorption experiments were carried out using headspace GC. The intercalation
of chlorobenzene into the interlayers of organo-MM was detected by X-ray diffraction.
The adsorption isotherms found were of the S1 type indicating a cooperative effect. Chlorobenzene showed a higher affinity
for 2C18-35-MM than C12-89-MM, which could not only be explained by the organic carbon content. The comparison with 2,4-dichlorophenol adsorption
has implied that for the studied systems the different adsorption mechanisms are primarily governed by the different molecular
properties and not by the type of absorbent. The presence of 2C18-35-MM caused no negative effect on the investigated microorganisms and complete biodegradation of chlorobenzene was achieved
without desorption limitation for growth, demonstrating the applicability of partially modified organoclays for bioremediation. 相似文献
128.
Uffe Høgsbro Thygesen Christoffer Moesgaard Albertsen Casper Willestofte Berg Kasper Kristensen Anders Nielsen 《Environmental and Ecological Statistics》2017,24(2):317-339
Many statistical models in ecology follow the state space paradigm. For such models, the important step of model validation rarely receives as much attention as estimation or hypothesis testing, perhaps due to lack of available algorithms and software. Model validation is often based on a naive adaptation of Pearson residuals, i.e. the difference between observations and posterior means, even if this approach is flawed. Here, we consider validation of state space models through one-step prediction errors, and discuss principles and practicalities arising when the model has been fitted with a tool for estimation in general mixed effects models. Implementing one-step predictions in the R package Template Model Builder, we demonstrate that it is possible to perform model validation with little effort, even if the ecological model is multivariate, has non-linear dynamics, and whether observations are continuous or discrete. With both simulated data, and a real data set related to geolocation of seals, we demonstrate both the potential and the limitations of the techniques. Our results fill a need for convenient methods for validating a state space model, or alternatively, rejecting it while indicating useful directions in which the model could be improved. 相似文献
129.
Erwin Wauters Karoline D'Haene Ludwig Lauwers 《Journal of Environmental Planning and Management》2017,60(8):1464-1484
We investigate farmers’ intentions to apply biodiversity conservation practices from a psychological perspective, using an adapted version of the theory of planned behaviour (TPB), including group norms and putting emphasis on moral norms and self-identity. The study is based on a quantitative survey (n = 99) in Belgium, analysed using confirmatory factor analyses and path analysis. Results suggest that the impact of attitudes, social norms and perceived behavioural control on intentions is almost fully mediated through moral norms and self-identity. To have a sustained impact, change actions should strive to embed biodiversity conservation into the social norms and into the good farmer identity of the farming community. While acknowledging the explanatory nature of this study, the findings could suggest another view on how to induce behavioural change. 相似文献
130.
Kasper Lundtorp Dorthe L. Jensen Thomas H. Christensen 《Journal of the Air & Waste Management Association (1995)》2013,63(6):722-731
Abstract A stabilization method for air pollution control (APC) residues from municipal solid waste incineration (MSWI) involving mixing of the residue with water and FeSO4 has been demonstrated on a semi-industrial scale on three types of APC residues: a semidry (SD) APC residue, a fly ash (FA), and an FA mixed with sludge (FAS) from a wet flue gas cleaning system. The process was performed in batches of 165-175 kg residue. It generates a wastewater that is highly saline but has a low content of heavy metals such as Cd, Cr, and Pb. The stabilized and raw residues have been subject to a range of leaching tests: the batch leaching test, the pH-static leaching test, the availability test, and the column test. These tests showed that the stabilized residues have remarkably improved leaching properties, especially with respect to Pb but also with respect to Cd, Cu, and Zn. The release of Pb was reduced by a factor of 250-36,000. 相似文献