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EDTA, Dodecylbenzene sulfonate, HCl, Tartaric acid and CaCl2 were used as extractants to remove Cr and Pb from Pb, Cr-contaminated soils. Batch equilibrium experiments were performed under variation of solid:liquid ratio and washing time. The results indicated that Citric acid, EDTA and Tartaric acid were effective for extracting Cr from the soils and EDTA, HCl and Tartaric acid were effective for...
Eluent selection is the restrictive element in the leaching and extraction restoration techniques. Surfactant as a kind of eluent, it received extensive attention for removing organic pollutants and heavy metals at the same time. Numerous studies had shown that surfactant can remove pollutants from the soil effectively. It has a better removal effect on soil organic matter and heavy metals. Function...
The influence of soil contaminated with the diesel oil on the enzymatic activities (dehydrogenase, urease, phosphatase and lipase) was investigated and it focused on the changes in the levels of enzymatic activities to determine the possibility of using these values as indicators in assessing the bioremediation test. The relationship among enzymatic activities and biochemical parameters were analyzed...
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...
A method for extraction and separation of petroleum hydrocarbons (PHs) and polycyclic aromatic hydrocarbons (PAHs) from heavy oil-polluted soil was developed. Effects of several factors such as ultrasonic power, temperature, and elution solvents on the extraction were investigated. The experimental results indicated the optimal experimental conditions were obtained as follow: 300 watt of ultrasonic...
In this paper, flue-cured tobacco cultivar (Nicotiana tabacum L. K 326) was selected to explored responses of flue-cured tobacco plants to different concentration of lead (Pb) or cadmium (Cd). The plants were grown in nutrient solution in lab under the controlled condition. Research showed dry weights of each organ and whole plant and values of botany characters and Chlorophyll contents of upper leaf...
The bioremediation of the heavy oil is often limited by high viscosity and low bioavailability. The aim of the present study was to find methods for enhancing rates of heavy oil biodegradation. Biodegradation of heavy oil by mixed bacterial consortium (BC) amended with Glycolipid biosurfactant (GBS) was monitored in shake flask conditions, which showed a significant reduction of the heavy oil at two...
This study discusses the feasibility of sequential combination of soil washing and chemical stabilization, through investigating the metal mobility in the treated soils. Results indicate that the washing can facilitate to chemically stabilize metals, if the soil has substantial labile fractions to be removed by washing. However, if the labile metal fraction is negligible, an opposite effect is often...
Restoration of petroleum-contaminated soil is one of the most important issues of environment protection all over the world. In order to study the influence of pollution concentration on biodegradation, a specific exogenous microbe, Phanerochaete chrysosporium, was employed for bioremediation of soil contaminated by different concentrations of petroleum. After 60d of treatment, the degradation rate...
The production of municipal sludge is very huge. Deposition of municipal sludge usually cause mental pollution, so deal with sludge and eliminate associated pollution is attractive. We focused on strategy of to resolve the sludge pollution through biological methods of agriculture utilization. Weeds of Scirpus planiculmis (SP) were used to remove the heavy metals of Cu, Zn, Pb, Cd, Cr, and Ni in the...
A systematic soil sampling including 32 topsoil samples and 80 subsurface soil samples were collected to investigate the distribution of heavy metal (HM) contents of soils in an industrial area of Zibo, China. Both the total contents and water soluble contents of 6 HM (Cu, Pb, Cd, Cr, As, Hg) were analyzed to assess the enrichment and mobilization ability of the elements. The relative cumulative frequency...
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