Applied Mechanics and Materials Vols. 587-589

Abstract: The source of the underground water in Yulin city were applied to monitor and evaluate five kinds of heavy metals which are Cr⁶⁺, Cd, As, Pb and Hg, and it revealed that the concentration of them were lower than the "drinking water health standards" (GB5749-2006), taking the source of drinking water in Yulin University as an example. A preliminary health risk assessment of the risk caused by drinking water has been done, based on the health risk assessment model recommended by USA Environmental Protection Agency. The datum showed that the health risk of carcinogenic substances (Cr⁶⁺, Cd and As) were much larger than that of non-carcinogenic substances (Pb, Hg) , so the priority control sequence should be Cr6+>Cd>As>Pb>Hg. The result showed that, human health of personal annual risk caused by the heavy metal pollutants in drinking water from the campus of Yulin University had exceeded the acceptable health risk level of 5 × 10^-5/a which is established by the Radiation Protection Committee. Cr⁶⁺ is the main contribution, and should cause the attention of the relevant departments, also is the priority governance indicators.

Abstract: The causes of atmospheric fine particles PM2.5 are complicated and are influenced by multiple factors conditions. Considering the analysis of the diffusion problem under the direction of the wind change, this paper proposes a gray theory and a new way of combining Gaussian plume model, namely the MGM - Gaussian plume diffusion model. Draw the diffusion area of PM2.5 under the influence of the wind.

Abstract: Moisture content meter due to their high sensitivity and stability , is widely applied in landslide groundwater dynamic monitoring. This article introduce moisture content instrument installation procedure and way on an actual landslide. Through long-term operation, the installation process provides a powerful technical support for groundwater dynamic monitoring data of stability and real measurement .Monitoring data of real access to provide reliable data support for the research of landslide stability.

Abstract: Sulfur-doped nanoTiO₂ transparent hydrosol with an average particle size of 3.8 nm was synthesized by a novel complexation-controlled hydrolysis method at room temperature and atmospheric pressure by using TiCl₄, thiourea, organic carboxylic acid, NH₃ H₂O, D-sorbitol etc. as raw materials. The composition, phase structure, particle size, absorbance spectrum, and photocatalytic performance of samples were characterized by XRD, nanolaser particle size analyzer, ultraviolet-visible spectrophotometer. In addition, the influence of reaction conditions in the synthesis process was also studied. The results indicate that when nanoparticle doped with 0.5% S, and the reflux time was 15 min, the photocatalytic performance of sulfur-doped TiO₂ hydrosol was best.

Abstract: Automatic monitoring indicators system of pollution is the key and foundation to construct network of pollutions in total amount monitoring.Scientific and reasonable indicators system can reflect pollutant situation and influence on water environment.Automatic monitoring indicators in pollution of sources are confined to COD and ammonia nitrogen as well as short of monitoring indicators to character features of pollutional sources.It is necessary to conduct optimization and selection of automatic monitoring indicators.Based on beer manufacturing in demonstration area as the research object,analyze sources of pollution in Qinghe basin producing and sewage situation;adopt screening methods to complete optimization and selection of automatic monitoring indicators.Build the system of automatic monitoring indicators in beer manufacturing successfully to provide theoretical support for constructing network of water pollutant total amount monitoring.

Abstract: With the increase of antibiotics usage, concerns on antibiotics contamination have been raised because of their serious environmental impacts in recent years. Antibiotics have become the emerging contaminants of soil. This paper reviews the pollution situation, the potential harm and the way of biodegradation of antibiotics in order to provide the reference to eliminate antibiotics pollution.

Abstract: The heavy metals contents of 29 samples were tested in Nansi Lake which was divided into 5 parts. The heavy metals included Hg, Cd, Cr, Pb, Ni, Cu, Zn and As. The spatial distribution of heavy metals of 5 Lakes region has been received. The pollution of heavy metals was with evaluated with I_geo and RI. The results showed that: Nasi Lake has been polluted by heavy metals in middle level, and As, Hg, Cd and Pb were more serious. The heavy metals pollution of the part in north were more serious than in south, except the As and Cd. Overall, the heavy metals pollution in the north Zhaoyang Lake was the most serious, followed by the Nanyang Lake, Weishan Lake, Dushan Lake and the south Zhaoyang Lake.

Abstract: In “Eleventh Five-Year” period, Guangxi has vigorously promoted the construction of municipal wastewater treatment plants. The statistics about construction scale shows that most of sewage treatment plants are small-scale. The main processes adopted in the plants are Oxidation ditch(OD), A²/O and SBR and its improved processes. The loading rate is generally low. COD and BOD removal effect are 78% and 87%. In scale of below 2×104m³/d, 2-5×104m³/d,5-10×104m³/d and more than 10×104m³/d, the costs of Diatomite, Oxidation ditch(OD), Oxidation ditch(OD), A²/O processes are relatively provincial, respectively. Meanwhile, the running costs of sewage treatment plants are mainly affected by the scale of construction and loading rate.

Abstract: Qinhuangdao is an important coastal tourism and port trade city in our country, and its environmental change and development trend of the offshore area will directly affect the future development of the city^[1]. This paper analyzes the comprehensive renovation of Qinhuangdao offshore environment, and puts forward to build such five safeguard mechanisms as the organizational guarantee, support guarantee, capital support, technical support and public participation, aiming to improve the Qinhuangdao offshore water environmental conditions and promote the sustainable development of the coastal zone region.

Abstract: In the recent years, antibiotics and heavy metals have become common pollutants in soil. Plant-microbial remediation is promising for the management of antibiotics and heavy metals pollution in soil. This paper talks about the mechanization of plant-microbial remediation, finds the advantages and disadvantages about plant-microbial technology, summarizes the method of selection of the plant and microbial, influential factors, and discusses the future research priorities of plant-microbial remediation.