Papers by Author: Bin Liu

Abstract: Landfill leachate treatment is a major problem to be solved in the field of environmental protection, and ammonia nitrogen is one of the major pollutants in landfill leachate, whose processing technology needs further improvement. In this paper, ultrasound/ultraviolet co-oxidation technology was directly applied to the treatment of high concentration landfill leachate without the pretreatment operations of dilution, filter, and adjusting the pH conditions. The results showed that: ultrasonic and ultraviolet had certain effects on the ammonia nitrogen removal, and the ammonia nitrogen removing effects became better when the ultrasonic power was greater, or the ultraviolet wavelength was shorter. When the ultrasonic power was 100 W, the ammonia nitrogen removal efficiency was 25.2%, and the UV of 254 nm could decompose 20.2% of the ammonia nitrogen in landfill leathate. In the condition of aeration, ultrasonic and ultraviolet had good synergistic effect on leachate ammonia nitrogen treatment. When the ultrasonic power was 100 W, UV wavelength was 254 nm, and the aeration rate was 150 L/h, the ammonia removal efficiency of high concentration leachate (ammonia nitrogen concentration of 1800 mg/L) reached 98.5% after 6 hours. The paper's research results provide a useful reference for the removal of landfill leachate ammonia nitrogen.

Abstract: It is critical to properly dispose and utilize aged waste from informal landfill in China currently. Seed germination experiments using Lolium perenne L. were carried out to investigate terrestrial ecotoxicity of the aged waste. 20%, 80% and 100% of aged waste were added to the culture medium, and distilled water and soil were uded as contrast. The results showed that aged waste could substantially improve the seed germination of Lolium perenne L. , and didn’t show toxic effects. The optimal proportion of aged waste in mixing matrix (aged waste and soil) was 80%, whose seed germination potential presented 52.0% and 24.0% higher, and germination rate presented 34.3% and 20.9% higher than that of in distilled water and soil substrate respectively. Meanwhile, aged waste could also facilitate the growth of root and sprout remarkably. The seeds grown in the optimal aged waste matrix increased their root length, sprout length and fresh mass by 316.4%, 108.4% and 100.1% in comparison to those grown in distilled water respectively. And the root length, sprout length and fresh mass of Lolium perenne L. grown in the optimail aged waste matrix were 50.0%, 46.9% and 74.0% higher than that of the control groups using soil as culture medium respectively. The experimental results indicated that land application could be a feasible approach for matured aged waste recycling.

Abstract: This paper investigated a new type of admixture which can be used to enhance the resistance of concrete surface to deicing salt deteriorating. Physical and mechanical properties of concrete incorporating this salt-scaling resistant admixture were measured. Practical application on site has proved that this admixture is effective for concrete to resist salt-scaling action.