Advanced Materials Research Vols. 807-809

Abstract: Carboxymethyl cellulose (CMC)-supported layered double hydroxides (CMC-LDHs) were synthesized by ion exchange method. The raw cellulose, unsupported LDH and CMC-LDHs were characterized by XRD, and FTIR. The CMC-LDHs was applied to adsorb boron with batch adsorption in aqueous solution, and the conditions influencing its adsorption amount were investigated. The experimental results showed that the CMC-LDHs had higher adsorption amount than the precursor, and the adsorption amount increased with increasing the contact time, boron concentration, and the pH.

Abstract: The coulpling method of microwave irradiation and Fenton-like reaction with magnetic nanomaterials of CuFe₂O₄ as the catalyst was used for degradation of Rhodamine B wastewater. Factors affecting the degradation rate of Rhodamine B such as H₂O₂ dosage, CuFe₂O₄ dosage, Rhodamine B initial concentration, reaction temperature and so on were investigated systematically. The experimental results showed that the microwave-assisted Fenton-like process using H₂O₂/CuFe₂O₄ was the most effective treatment process compared with other methods. Unlike the conventional Fenton reactions, which are catalyzed by homogeneous catalysts/promoters, the nanopowder CuFe₂O₄ catalyst is easily collected by an external magnetic field and remains efficient in reuse. The results showed that under the given conditions (80°C, pH = 4, Rhodamine B initial concentration = 100mg/L, CuFe₂O₄ dose = 0.375g/L, H₂O₂ dose = 2.5mL/L, Reaction time = 2min), the removal rate of Rhodamine B could reach nearly 100%. Moreover, the COD determination results showed that under above conditions, the COD value could reach zero.

Abstract: Based on a detailed survey on the source and volume of SO₂ emission over Chengdu economic circle, the third-generation air quality model CMAQ is adopted for simulating the concentration of SO₂ in the air over Chengdu Economic Circle. The results show that the hourly average concentration, daily average concentration and annual average concentration of SO₂ in air exceed the limit of national standard, and the affected areas respectively account for 0.12%, 0.18% and 0.03% of the total area of the economic circle. Meanwhile, according to the result of calculation, the SO₂ emissions of thermal power plants, chemical industry, building materials plants and industrial area sources make the largest contribution to the SO₂ concentration in the air, with ratios of 36.15%, 18.67%, 11.81% and 8.34% respectively. thus,main measures to reduce emissions of SO₂ in Chengdu economic circle are proposed as follows: focusing on the control of the emissions of SO₂ from industrial enterprises, especially in the thermal power plants, chemical industry, building materials plants as well as industrial boilers; joint prevention and control measures should be implemented between the cities, so as to reduce the interaction caused dy emissions of SO₂. With the application of the above measures, the total SO₂ emissions can be reduced by 50% and the concentration of SO₂ in the air can meet with the Class II of national ambient air quality Standard.

Abstract: Analysis about contents and distributions of heavy metal elements in soil is one of the primary matters in surveying geochemical environmental quality in Rizhao tea-planting areas. By using 1km×1km sampling data of surface soil in Rizhao tea-planting areas, Geostatistics method is adopted to analyze spatial distribution of heavy metal elements, and nemerow synthetic index method is adopted to assess environmental qualities of heavy metals and show the result out by Kriging interpolation. The assessment results are as follows: the distribution of all the heavy metals besides Cd, Pb is comparatively uniformity; From the result of the single pollution index, the gross part of research areas is clean, only Cd, Ni pollution existed in finitude areas; From the spatial distribution of nemerow synthetic pollution index, 88.41% of the research areas soil belongs to level I, and 6.44% belongs to level II, and 5.14% level III, while no area belongs to level IV and level V.

Abstract: The process of oil extraction and processing produces large quantities of oily sludge, which is complex and unwieldy. It has become the main pollution factor of affecting oil production. So it is necessary to look for a reasonable treatment technology of oily sludge .This document introduces different sludge treatment methods and technological process, highlights the pyrolysis principle and test methods, and looking forward to the development of oily sludge treatment process.

Abstract: Based on the general description of the present city river courses distribution in Zhenjiang, this paper made an analysis of the situation of polluted river courses. Several general planning treatment principles were raised. Meanwhile, by comparing treatments of polluted river courses between home and abroad, this paper put forward several methods suitable for polluted city river courses in Zhenjiang area.

Abstract: Judging from the current status of water resources all over the world, the analysis of our country the need for reuse of rainwater and its practical significance at this stage. The using of rain water from domestic and foreign , and the actual situation of the construction of rainwater collection, processing, using of systems, rain water reuse in the case of water quality standards implementation rainwater recycling of resources. The water resources are shortage is another important practical problem ,the rainwater reuse is our country's new way to solve water resources pool. However, the disposing process of rain still has some practical problems, which will be necessary to further our study and resolve.

Abstract: With the national environmental standards becoming more and more strict, electrostatic precipitators is facing the new challenges, promoting the efficiency further and reducing emissions are essential to achieve the environmental standards. This paper analyzed the influential factors of the dust removal efficiency of electrostatic precipitators in coal-fired units, and discussed the relationship between dust removal efficiency and its factors, which lay the foundation for improving the dust removal efficiency.

Abstract: A large number of waste oil and sludge were generated during mining and processing. Untreated Sludge directly discharged into environment will lead to critical human health harm and serious environment pollution. As one of the petrochemical process major pollutants, treatment of oil sludge processing, at home and abroad, has been trying to study. Summary of development status and prospect research of oil sludge treatment technology, combining characteristics of the oily sludge, in domestic and foreign were made in this article.

Abstract: Partial nitrification-anaerobic ammonium oxidation-nitrification coupled technology was used for removing nitrogen from coking wastewater. Through continuous optimization of the nitrogen removal technology, NH₄⁺-N, NO₂^--N and NO₃^--N concentrations in the effluent stabilized at 0~3, 0~0.5 and 5~20 mg/L, COD<100 mg/L, the effluent quality could meet the primary standard of “Integrated wastewater discharge standard (GB8978-1996)”. The removal efficiencies of NH₄⁺-N and COD reached up to 99.5% and 96.1% respectively. The novel technology performed well for treating coking wastewater, nitrogen and organic pollutants were simultaneously removed efficiently.