[Combined remediation of polycyclic aromatic hydrocarbons (PAHs) by plant and immobilized bacteria in contaminated soil].

In this study, three dominant bacteria (Ⅰ), (Ⅱ), (Ⅲ) from Fire Phoenix rhizosphere soil were used to develop a multi-microbial agent system. For oil-contaminated soil in the Dagang oilfield, the immobilized test bacteria were inoculated into the Fire Phoenix rhizosphere soil to examine the effects of bacterial agents on polycyclic aromatic hydrocarbons (PAHs)-contaminated soil. The results showed that PAHs degradation was promoted under the ⅠⅢ (with an effective number of viable bacteria of 10 cfu·mL) and ⅠⅡⅢ (with an effective number of viable bacteria of 10 cfu·mL) treatments.

[Ecotoxicological effects of chlorotetracycline on earthworm in soil].

Eiseniafoetida was selected to investigate the ecotoxicological effects of chlorotetracycline on the earthworm in soil. The results showed that 1, 10 and 100 mg · kg(-1) chlorotetracycline had no significant effects on earthworm's body mass after a 7-d exposure, but it was significantly inhibited by 10, 100 mg · kg(-1) chlorotetracycline after 21 days. The soluble protein content of earthworm was induced by 1, 10 and 100 mg · kg(-1) chlorotetracycline, and showed a positive response as the con- centration increased.

[Ecological adaptability of Hordeum jubatum to magnesite dust].

Hordeum jubatum was pot-cultured with the soil sprayed with different amounts of magnesite dust (0, 1%, 5%, 10%, 15%, 20%, and 30%) to study the magnesium (Mg) tolerance of the plant. After sprayed onto soil surface, the magnesite dust could rapidly form a crust. When the amount of the sprayed dust was bigger than 20%, soil pH increased significantly, soil conductivity had a gradual decrease, whereas soil organic matter content increased after an initial decrease.

[Application of wastewater land treatment technique to the construction of ecological engineering in sand land].

In this paper studies on the feasibility of harmlessness and resource of wastewater, which was discharged from a thermal power plant, by using slow rate filtration of land treatment technique for the fast recovery of vegetation in the Kubuqi sand land were carried out. The selected arbor, shrub and herbage in the land treatment system were poplar (Populus alba Var. Pyramidalis bunge), seabuckthorn (Hippophae rhamnoides) and sweet clover (Melilotus suaveolens) respectively.

Greenhouse gas emissions from a constructed wetland for municipal sewage treatment.

The fluxes of greenhouse gases (methane and nitrous oxide) emission from a constructed wetland in the Eastern China as municipal sewage treatment were measured from June 1999 to August 2000 by the closed chamber method. The constructed wetland for municipal sewage treatment is a significant source of methane, up to 976.6 x 10(6) g CH4/a, which was emitted from the constructed wetland with the area of 495,000 m2 and wastewater loading rate of 12,000 m3/d.