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The purpose of this study is to evaluate the adsorption potentialities of humate substances in natural environments. Humic acid and insolubilized humic acid are selected as prototypes. This paper presents the development of a new remediation technology for contaminated sandy soil using humic acid (HA). The results indicated a significant increase of the adsorption of Cr (VI) because the complexion...
Influence of soil organic matter (SOM) on the adsorption, desorption and transport of polycyclic aromatic hydrocarbons (PAHs) has already been given full investigation in soils. In this paper, High Performance Liquid Chromatography (HPLC) was used to detected and elucidate aqueous leaching of PAHs in different types of soil with soil columns, which enhanced understanding on transport of PAHs appreciably...
Soil samples in different depths we recollected from Tiebutie pool in Daqing, which was used to take up waste water from a petrochemical plant for about 30 years. The distribution and concentration of polycyclic aromatic hydrocarbons(PAHs) in organo-mineral aggregates were analyzed. Results show that the concentration of low molecular PAHs is the highest in all fractions, and the concentration of...
Adsorption-desorption behavior of copper in Sichuan mine soils was studied using the batch method. The measured copper adsorption data was described by the Langmuir equation and the Freundlich equation respectively. The results indicated that the Freundlich equation was less suitable than the Langmuir equation to describe the adsorption data. In contrast to copper adsorption, the amount as well as...
At present the rare earth fertilizer were widely used in agricultural production, there were many researches on the biological effects of rare earth fertilizer. But there were few researches to study the effect of rare earth on the migratory characteristic of heavy mental. Experiments were conducted to study the effect of lanthanum on absorption and desorption of copper in soil. The results showed...
In order to examine phenanthrine desorption of the phenanthrine in aeration zones and acquifer, soil from top soil layer, lower aeration zone and acquifer of the vertical profile of the four points in Zhangshi Irrigation area are taken as sample soil, phenanthrine as typical pollutant. The experiment is continuous batch adsorption-desorption experiment whose data are derived from linear models and...
Microbe produced rhamnolipids are often mixtures containing multicomponent homologues. To understanding the rhamnolipid sorption affected by its homologue compositions is of considerable importance to its application for environmental restorations, including rhamnolipids pump-and-treat for polluted groundwater, rhamnolipids flushing to mobilize hydrophobic contaminants, as well as effects of contaminants...
The research chose the alginate sodium and PVA as the materials to immobilize the atrazine degrading bacteria. Four methods were adopted: alginate sodium adsorption method, alginate sodium embedding method, PVA boric cross linking method and PVA freezing method. The degrading effects and the characteristics of the atrazine degrading bacteria in the two materials were studied respectively. The result...
By using a hydrothermal treatment process, coal fly ash was transferred to a series of synthesized zeolites and characterized XRD and SEM observations. The synthesized zeolites exhibited more enhanced adsorption capacities for metals compared to the raw material as the increased CEC of the synthesized zeolites apparently provides a better adsorptive ability for metals. For the three synthesized zeolite...
Batch equilibrium experiments were performed to assess adsorption and desorption characteristics of nitrobenzene and aniline by wetland soil. The results showed that wetland soil had strong adsorption capability for nitrobenzene and aniline, adsorption and desorption of nitrobenzene and aniline by different types of wetland soil were different. The linear and Fruendlich model were fit for describing...
Aimed at the current situation of nitrogen pollution in groundwater, adsorption characteristics of ammonia-nitrogen onto different lithology named silty sand, silty clay and clay were studied. The results indicated that the process of ammonia-nitrogen adsorption onto soils mainly occurred within 0~2 h, then attended to a dynamic equilibrium. Two kinetic models can describe the experiment data and...
Laboratory experiments were employed to investigate the influencing factors of BTEX volatilization. Characteristic of BTEX compounds was critical factor of volatilization; the higher saturated vapor pressure, the greater volatilizing speed. Type and structure of underlying materials determined the volatilization kinetics mode, the influence of channel blocking and adsorption of soils was stronger...
On the basis of convection, dispersion and non-linear adsorption, the numerical model of pollutants migration through landfill liner was established under coupling of temperature and chemical osmotic pressure. The numerical model was used to predict pollutant migration through landfill liner. The sensitivity of the relevant parameters was analyzed. The results showed that the Cr(VI) gradually extended...
In this paper, an undisturbed soil-column experiment and its mathematical model are investigated, and an inverse problem of determining the unknown source/sink parameter and adsorption coefficient simultaneously is considered with the additional breakthrough data. By applying an optimal perturbation algorithm, jiont inversions for the source/sink term and the adsorption coefficient are successfully...
The properties of plant root exudates and their effects on the water solubility of PCP were investigated in this paper. The results showed that the hydrophobic and the high-molecular-weight fractions of sunflower(Helianthusannuus) root exudates were more than those of lucerne(Medicagosativa) root exudates. With time elapsed, the biodegradation rate of lucerne root exudates was higher than sunflower...
Cadmium adsorption features by montmorillonite and illite in alkaline conditions and the influence of inorganic salts were studied by experiment. The cadmium adsorption equilibrium time was 6 hours when the pH values in initiative solutions were 9, and the adsorption cadmium capacity by montmorillonite and illite was 6.910 mg.g-1 and 6.642 mg.g-1. When there are inorganic salts in the solutions of...
Investigation of the adsorption behavior of organic pollutants by soils is fundamental to simulating and eventually predicting their transport in environmental compartments. The adsorption behavior of p-chlorophenol by soils from yancheng reed wetland was studied in a series of batch equilibration experiments, and experiments were analyzed by Langmuir and Freundlich isotherm equation. Results showed...
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