Informatics Publishing Limited

Yuejian Wang ¹, Junmin Zhang ¹, Lin Liu ¹, Jianlong Zhang ², Solvakoru Alexander ³

Affiliations
1 College of Science, Geography Department, Shihezi University, Shihezi, 832000, CN
2 College of Educational Technology, Shihezi University, Shihezi, 832000, CN
3 Krzhizhanovskyy Environment Engineering Research Institute, Moscow, 119007, RU

Abstract

PM10 samples were collected in spring and summer 2010 in Manas River Basin, Xinjiang, China. The water-soluble fraction was subjected to plasmid DNA assay, and several conclusions were obtained. Damages to DNA caused by PM10 with the same mass concentration were different and related to the source of particulate matters and their complex components. The correlation between mass concentration and damage rates of the samples was not linear, indicating that the rate of particulate matter damage reached a threshold value under the synthetic action of their complex components, and then the range of damage changed with increased mass concentration. Damage to DNA caused by PM10 samples in spring was significantly lower than that in summer. Little difference in toxicity was observed between whole samples and their water soluble fractions in both spring and summer. In other words, in the same city and under similar weather conditions, the toxicity of the whole particulate matter samples was close to the toxicity of their water-soluble fraction, indicating that the damage to DNA was usually due to the water-soluble fraction of particulate matters.

Keywords

Toxicology of PM10, Plasmid DNA Assay, Manas River Basin, Particulate Matter.

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Hao Wang ¹, Huiyuan Zhong ¹, Lin Liu ¹, Bingxu Quan ¹

Affiliations
1 College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan, 063009, CN

Abstract

In this research, electrocoagulation technology was used to treat high fluorine content geothermal water. The fluoride removal performance and operating costs have also been discussed. The results showed that electrocoagulation was an ideal technology to remove fluoride ions from geothermal water, and did not need to change the pH value and temperature of raw water. During the static experiments, for electrolysis time of 15 min, plates spacing of 0.5 cm, area of plates/volume of wastewater of 80 m²/m³, current density of 4.5 mA/cm² and no adjusted pH, the highest removal efficiency of fluorine from geothermal water was achieved. Under these operating conditions, the fluoride concentration of effluent water was 0.8 mg/L or so, which fully met the drinking water health standard (0.5 mg/L < F- < 1.0 mg/L). Meanwhile, the energy consumption was evaluated under various operating conditions. And it would be affected by some different parameters. Besides, dynamic experiments were carried out when optimum parameters were selected after static experiments. When the current density of 10 A/m², the system effluent fluoride concentration was about 1.4 mg/L, and the process did not meet the requirements, so current densities were adjusted to 12.5 A/m² and 15 A/m², while the effluent fluoride concentration was about 1.2 mg/L and 0.8 mg/L, respectively.

Keywords

Defluoridation, Fluorine, Electroflocculation, Geothermal Water.

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