Advanced Materials Research Vols. 864-867

Abstract: Recently, China has encountered significant challenges in improving, on a large scale, the environmental performance of its industries, which puts great threat to energy conservation and human health. As one of the State-owned Key Enterprises, to check and reduce negative environmental impacts throughout the subsidiary companies production processes, pollutant emission audit is conducted, which will find total mass of discharged pollutant and weaknesses in the enterprises environmental management. Consequently, this paper established the audit framework, concluding audit objectives, principle and methodology. Finally, nine companies were conducted in this case study.

Abstract: The efficiency and problem of SNCR in cement are explained by case study .Catalyst also is discussed by the research. And this paper presents and discusses the technical feasibility issues related to implementing SCR technology at cement plant. Some pilot plant trial and scale-full plant are also discussed and the result show that SCR can reduce NOx emissions from cement kilns by greater than 90% and achieve less than 100 mg/Nm3 NOx emissions. The fact suggests that it is a more effective and proven technology to reduce nitrogen oxide emissions from cement kilns.

Abstract: Due to the characteristics of dissolved oxygen process, such as non-linear and time delay, the traditional control methods are not very ideal for the aeration quantity assignment in the major domestic wastewater treatment plants. An intelligent system that controls the aeration quantity of the wastewater treatment of biochemistry pools is adopted, which the feedback control and the intelligence model are used to keep the balance of aeration. Meanwhile, according to the concentration of dissolved oxygen, the rotational speed of the air blower is adjusted for the sake of saving energy. This control system has been realized by Schneider Premium TSX P57 PLC system and the results show that the system is stable and reliable.

Abstract: With the development of the oil industry, oilfield sewage, as a big pollutant, treatment has become an important issue. Since the complex components of oily sewage, untreated oily sewage may lead to serious environment problem if discharged at will.So it must be treated before discharged or returned into the layer.In this study, some treatment methods is introduced, and their treatment effects are illustrated.

Abstract: Dolomite, an industrial solid material was used as an adsorbent to remove phosphate anions from wastewater. The effects of initial pH, initial phosphate concentration, reaction time, reaction temperature and adsorbent dosage on the phosphate removal efficiency were investigated. The results show that the phosphate removal efficiency exceed 99% under the conditions of pH 9.5, temperature 30 °C, reaction time 50 min, particle size <0.074 mm, initial phosphate concentration 50 mg•L^-1, adsorbent dosage 10g•L^-1 and stirring speed 250 r/min. After phosphate removal reaction, the residual phosphate concentrations completely meet the requirement of national discharge standards of the second category pollution (GB 1A (TP = 0.5 mgL^-1)).

Abstract: In this research, heavy metal copper was chosen for this study, with its sulfate solution simulated wastewater, using spouted particulate electrodes to purify wastewater and recycle metal copper. Experimental studied the effects on different conditions of electrodeposition, such as pH, constant current, copper ion concentration, the size of the cathode particle and nitrogen sparging. The results showed the optimum conditions were that pH was 3.0, constant current was 10.0A, the size of cathode particle was 1.8mm and with nitrogen sparging. In particular, nitrogen sparging not only reduced dissolved oxygen in wastewater to prevent the metal back to solution, but also handled the problem of low current efficiency due to concentration polarization and electrochemical polarization.

Abstract: In order to achieve the goal of purifying the nickel-containing waste,use the Spouted bed particulate electro-deposition to treat it . Experimental studies show that the best condition is the concentration of nickel influence 1000mg/L, the current is 15A, pH 4.5, and particle size of 1.8mm under the condition of blowing nitrogen. The removal rate of nickel can reach 74.77%. Nitrogen can effectively reduce the concentration of dissolved oxygen in the water and obtain a higher electro-deposition efficiency and current efficiency.

Abstract: Wohushan reservoir is an important drinking water source for south urban area of Jinan, however, the water quality of Wohushan reservoir is not safe, and agricultural non-point source pollution is the main reason that caused the water quality deteriorate. This paper analysed the sources of non-point source pollution through datum of population and agriculture production and other economic and social activities in Wohushan reservoir area. The water quality effect of domestic sewage, house refuse, live stock dung, and unreasonable use of fertilizer and pesticide were discussed as emphasis. Further more, the factors of the non-point source pollution were summarized according to policy, statute, economic, technology etc. At last, countermeasures of non-point source pollution prevention and control were proposed based on the source and pathway control of contaminates including perfect law system, strengthen policy guidance, increase funding, use fertilizer and pesticide reasonably, popularize biotechnology and methane tank, carry out efficient eco-agriculture construction, etc.

Abstract: To control mercury pollution has become a major issue nowadays. The SCR systems in power plant can oxide the elemental mercury into oxidized mercury, which can be removed by WFGD, it became a very feasible measures to control mercury pollution. The core part of SCR system is SCR catalyst. The influence of different metal composition and modification of SCR catalyst and the gas composition in simulative flue gas for the efficiency of the conversion of elemental mercury are introduced ,for sifting the catalyst with high efficiency for mercury conversion under the condition of low temperature.

Abstract: Cement Precalciner is the important devices in the cement production,also the main part which the pollutants are produced. Hence, it is extremely important to optimize the performance of the precalcine and low NOx emission. This thesis base on the previous article, aim to review of denitration for the cement kilns.