Advanced Materials Research Vols. 726-731

Abstract: In order to study the soil amend agent how to suppress the function of the vegetables absorb Pb, the Pb was added in the experimental soil in pakchoi pot, The lime and peanut dry cake were added to the experimental soil as modifier, and the varying concentrate of modifiers, lead effect on pakchoi biomass and lead accumulate were discussed in this paper. Through the determination of Pb content of aboveground and underground part of pakchoi by ICP, the lime and peanut dry cake can resist lead absorption were proved, and the lime achieved better inhibitory effect of the two. By analyzed the BCF of two parts of pakchoi, two types of modifiers had proved can reduce the pakchoi BCF of Pb in the soil. The lime was more efficient than the peanut dry cake on reducing BCF of Pb.

Abstract: The performance of biochemical treatment effluent from paper making wastewater treated by Fenton process was evaluated. The experiment result shows that the importance of influencing factors for Fenton oxidation treatment was H₂O₂ concentrations > pH > FeSO₄ concentrations > reaction time. With the optimal conditions of reaction, that is pH3 (initial pH5), FeSO₄ 3.6 mmol/L, H₂O₂ 3.4 mmol/L, and reaction time 60 min, the removals of COD and color for papermaking wastewater reached over 85% and 90%, respectively. The result also showed that in the process of Fenton method in the treatment of papermaking wastewater, for removing COD, the function by oxidation account for 15.5%, and the function of flocculation accounted for 69.8%.

Abstract: The traditional water treatment technologies mainly include physical reparation technology, chemical remediation technology and biological-ecological restoration technology. However, there are many limitations in practical application, especially for heavy polluted river. For this reason, it is extremely urgent to explore new technology and method on river ecosystem restoration. The materials of artificial plants are limited to the factors of water transparency, possesses acid and alkali-resistant, resistance to staining and flexibility. The characteristics of artificial plants are low in investment, effective and no secondary pollution. Therefore, it has a broad prospect of application in water treatment. In this paper, the detailed review and application of artificial plants were involved in order to provide theoretical basis for more widely used of artificial aquatic plants.

Abstract: The sustainable flux in dead-end mode of MF membrane filtration was confirmed in this study. Analytic results show that when flux above which an irreversible deposit (fouling) appears. The sustainable flux is dependent on the hydrodynamics and system properties (pH, ionic strength, membrane characteristics, particle characteristics, etc) and position along the membrane. Below the sustainable flux, tiny fouling is observed. In addition, the optimal pre-coagulation condition was found based on the maximum turbidity and organic remove rate.

Abstract: The effluent from biochemical treatment of pulp and paper making wastewater treated by heterogeneous Fenton fluid-bed reactor was evaluated. The results showed that in the condition of COD 350mg/L, and the optimum conditions of pH at 3, FeSO₄ 2.5mmol/L, H₂O₂ 3.4mmol/L, and reaction time at 20 minutes, the removal efficiencies of COD and color are more than 85% and 90%, respectively. The best drug dosing ratio of heterogeneous Fenton fluid-bed reactor has positive relations with COD of raw water, and the mole ratio of COD, FeSO₄, and H₂O₂ is 6.4:0.74:1.

Abstract: Constructed wetland conduct technology is a kind of artificialgovernable and engineered wetland system. A multiplied technology combination of "Hydrolysis precipitation, Contact oxidation and Constructed wetland" has been applied to conduct the domestic sewage of the towns, and the combination of that, the treatment effect and the working cost have been discussed here. The testing results of outlet water quality indexes showed as following, the removal rate of the CODCr was reach to 77.8%, the removal rate of the BOD5 was reach to 83.3%, the removal rate of the T-P was reach to 87%, the removal rate of the SS was reach 80% and the removal rate of the NH3-N was reach 67%.

Abstract: Large-scale controlled planting of water hyacinth has become one of the most important measures of Dianchi Lake’s treatment in the “12th Five-Year Plan”. This paper firstly introduced the present situation of large-scale controlled planting of water hyacinth in Dianchi Lake. The water quality of Caohai and Waihai of Dianchi Lake were compared before and after the project of planting water hyacinth. This paper concluded that the effects of large-scale controlled planting of water hyacinth on the ecological restoration of Caohai lake were outstanding. The area of controlled planting could be spread among other water areas of Dianchi lake where is suitable for the growth of water hyacinth in the future, and water hyacinth will pay a greater role in the ecological treatment of Dianchi Lake.

Abstract: A high-sulfur gas field is at trial operation, and its H₂S content is up to 14%~18%. If the high-sulfur gas field was operated properly and improperly, effects of SO₂ emission on regional ecological environment were analyzed. Based on the investigation of ecological environment status, the sulfur-absorption capacity of regional ecosystem was estimated, and then the ecological restoration programs were put forward, including the vegetation restoration program, the spoil ground restoration program, the ecological landscape reconstruction program and soil protection measures. This may offer experience for development and management of other similar gas fields.

Abstract: In recent years, China’s island ecology has been destroyed seriously, so ecological recovery of islands is an urgent task. Qiaoliangshan Island is a typical island in China that suffers from ecological problems after land ecology is destroyed by human beings. This paper introduces general situation of Qiaoliangshan Island, researches on species selection for vegetation ecological recovery on Qiaoliangshan Island and aims to provide a reference for ecological recovery of Chinese islands.

Abstract: A kind of typical organophosphate insecticide, methylparathion pesticide, was degradated by nano anatase catalyst under a variety of affecting factors. The results indicated that the effects of ultras onic degradation was more obvious in the presence of nanoanatase. The ultrasonic degradation kinetics of methylparathion pesticide in the presence of nano anatase catalyst followed the first-order reaction. The degradation ratio of methylparathion pesticide surpassed 94.2 % within 40 min under ultrasonic frequency of 50kHz, amount of 2000mg.L^-1 catalyst, output power of 40W, pH of 6.00, and temperature of 30°C, methyl parathion pesticide concentration of 40mg.L^-1.