In order to study the remedation technology of eutrophic artificial lake, an integrated restoration technique consisted of aquatic vegetation near lakesides, Effective Microorganisms (EM) , fingerlings and intermittent aeration system was constructed in Guilin City, Guangxi of China. The results indicated that the removal rates of Chemical Oxygen Demand (COD),total nitrogen (TN),total phosphorus (TP),suspended substance (SS) and turbidity achieved by this kind of technique were 63.14%~77.10%,54.18%~60.54%,85.76%~87.98%,82.36%,79.28% respectively, and the coverage ratio of duckweed decreases from 90% to 10%. Compared with conventional wastewater treatment systems, the integrated restoration technique do not cause secondary pollution, and has an obvious effect, especially it can maintain good water quality for a long time.
With the development of nuclear science, uranium-contained wastewater was heavily generated. If not properly handled, it is bound to bring environmental and human health hazards. Conventional uranium-contained wastewater treatment technologies are limited in certain aspects, such as high reagent and energy consumption, secondary pollution and so on. The microalgae-based biosorption technique for treating uranium-contained wastewater is an economical, simple, effective and feasible approach. This paper summarized the basic mechanism of the technology, and discussed the effects of different pH, algal cell biomass concentration, initial uranium ion concentration and the growth state of algal cells on the biological treatment process of uranium-contained wastewater. Finally, the study explored the future prospects of the technology.
Aniline blue, one of the triphenylmethane dyes, is the most commonly produced and used of these dyes yet it is also the most dangerous and the most serious cause of pollution amongst them. An exploration of aniline blue degradation is likely to facilitate an understanding of the degradation mechanism for a range of related dyes. In this study, we managed to isolate a particular strain of microorganism, identified to be Lysinibacillus fusiformis N019a, which showed a significant capacity for aniline blue degradation in both laboratory tests and natural sewage treatment. In analysis aided by a UV-Visible spectrophotometer, we found that 96.7% of aniline blue had degraded within 24 hours under laboratory conditions. When treating natural sewage, 80.1% of the aniline blue was removed after just 16 hours. Further analysis has shown that Lysinibacillus fusiformis N019a has a strong resistance to Cu 2+ , Mn 2+ , Zn 2+ , and Pb 2+. We also found that the degradation product of aniline blue by Lysinibacillus fusiformis N019a was of reduced toxicity to plants and microbes.
O-phthalic acid is a kind of important pollutant, which accumulates in the environment with the extensive use of plastics and other products. Meanwhile, phthalic acid is one of the high content of allelopathic autotoxic substances secreted by tobacco. The accumulation of phthalic acid in soil is an important cause of tobacco continuous cropping effect. In order to degrade phthalic acid accumulated in environment, the barrier effect of tobacco continuous cropping caused by phthalic acid accumulation in soil can be removed. A strain capable of degrading phthalic acid was isolated from sludge of sewage treatment plant and compared with 16 s DNA. The homology between this strain and Enterobacter sp. is 99%. The optimum growth conditions are as follows: pH7 at 30˚C, 500 mg/L of o-phthalic acid, inoculation concentration ≥ 1.2% and its highest degradation rate of o-phthalic acid is 74%. The results of pot experiment showed that the degradation efficiency of o-phthalic acid in soil was about 40%, which alleviated the inhibitory effect of o-phthalic acid accumulation on tobacco growth.
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