Applied Mechanics and Materials Vols. 209-211

Abstract: Energy consumption reference values support the reference data for development of building energy efficiency potential. A uniform split model of energy consumption was established for calculating the item electricity consumption. Item electricity consumption are consisted by the electricity use of air conditioning system (chillers, chilled water pumps, cooling water pumps, cooling tower fans and end-use equipments), lighting system, indoor equipments and service equipments respectively. The data from site investigation was used to calculate the item electric energy use intensities (EUIs) in commercial office building. And these EUIs were used to identify the item energy reference value by two statistical analysis methods. The results show that the quadratic average EUIs which stand for the high level of energy consumption are lower than the mean plus standard deviation (SD) EUIs. Finally, the individual building (EUIs) can be compared with these reference values to evaluate building energy performance. And the item energy reference value is investigated in support of the retrofit of commercial office building.

Abstract: COD and BOD of the inflow of aeration basin and the effluent of secondary sedimentation tank were detected through orthogonal test.The test use removal rate of COD and BOD as evaluation index, B/C as analysis index. The result of the test indicated that the best working condition can be achieved when there are 3 water pumps for inflow, the concentration of activated sludge stands at 1600mg/L, and HRT in the aeration basin and secondary sedimentation tank stand at 1.86 hours and 2.87 hours respectively. The test demonstrated that short-time aeration can reduce the energy consumption and, therefore, the cost effectively, while insure the effluent reach the outlet qualitative standard. This is suitable for sewage treatment plants in south China since the concentration of their inflow is low.

Abstract: VOCs recovery technology on Chinese oil terminal has been listed as one of five “key energy saving and reduction projects during 12nd five years plan period” by Water Department of MOT, which can bring huge economic benefit. These technologies are mature in some international countries. Chinese VOCs system on Oil terminal are in the status of “initial stage', both the system and regulation required to improve a lot, which the implemented extent also be affected due to special problems caused by Chinese national condition. This paper compared the difference between domestic and international oil terminal VOCs recovery technology, listed the current development situation and barriers of VOCs recovery technology on oil terminal, and also analyzed the issues that should be resolved for extending VOCs technology on oil terminal. A brief introduction about started work be gave at the end of this paper. 

Abstract: Along of the rapid socio-economic development, population growth and the development of urbanization, the contradictions of water’s supplying and demanding in city are growing. Author advanced the Liu-yang city should strengthen water system planning and Set up a beautiful environment with resource advantage. Analyze the Liu-yang city water system’s current situation and issue by the “Pollution Treatment, Increase Income and Decrease Expenditure” strategy. Explored the small town water system’s planning from the main city zone water system planning, water resources protection and water supply planning, landscape water system planning.

Abstract: The comparative pilot experiments were conducted by using two medium-scale test equipments. All the raw water was taken from upstream of Huangpu River in Shanghai, China. The turbidity is studied for the output water of pre-ozonation process compared with that of pre-chlorination process. It was found that the effects of turbidity removal by pre-ozonation process were significantly better than that of pre-chlorination process in both the sedimentation tanks effluent and filters effluent.

Abstract: This paper summarizes the prevalence of waterborne diseases before disease prevention and water quality improvement project in Xinjiang rural areas, China; the measures taken in disease prevention and water quality improvement; and the current situation of the quality of rural drinking water project. Suggestions concerning the improvement of disease prevention and water quality improvement project in Xinjiang rural areas are also proposed.

Abstract: In order to study the purification effect on the particle size of matrix in ecological filter bed, four ecological filter bed units with different particle sizes (0~2mm, 2~15mm, 15~30mm, 30~50mm) are designed to purify the polluted river water. Results show that the particle size of matrix has considerable influence on the polluted river water quality improvement, and the purification effect decreases gradually as the particle size of matrix increases. During the whole experimental period, the ecological filter bed unit with the particle size of 0~2mm is the best in all four systems, and the average removal of it is 62.77% for CODCr, 73.04% for TN and 67.40% for TP respectively.

Abstract: Biological nitrogen phosphorus removal by the use of Sequencing Batch Biofilm Reactor (SBBR) is today an accepted and well proven technology. The objective of this study was to evaluate the performances of nitrogen and phosphorus removal in this laboratory-scale SBBR in treating synthetic domestic wastewater. The system was designed to handle at C/N ratio changing from 10:1, 5:1 to 3.3:1. The results were shown the average removal efficiencies of total phosphorus (TP) in this system were remarkable (>94.0%), however, the average removal efficiencies of total nitrogen (TN) reached 87.2%, 65.4%, 46.1% respectively as C/N ratio changing from 10:1, 5:1 to 3.3:1. Therefore we could reach a conclusion that the SBBR have the remarkable performance at the C/N ratios of 10:1 and 5:1, and the system is suitable to treat domestic or municipal wastewater.

Abstract: The Yangtze River Estuary has become increasingly challenged by various destructive threats to its ecosystem such as the frequent occurrence of harmful algal blooms. Four cruises were carried out in the Yangtze River Estuary and its adjacent area in 2006. Ten variables including CODMn, PO43--P, SiO3-Si, NO3--N, NO2--N, NH4+-N, TN, TP, TOC and chl-a were analyzed by exploratory data analysis. Nitrate was the dominant form of TN throughout the year. Principal component analysis (PCA) was applied to estimate the sources of nutrients contamination in 2006. Two principal components (PCs) were extracted, namely, CODMn, PO43--P, NO3--N and TN for PC1, NO2--N and chl-a for PC2. Influenced by anthropogenic sewage, PC1 near Shidongkou, Bailonggang, Xinhe and Zhuyuan outlets was higher than other stations. The primary influencing factor of PC1 were the contaminants carried by runoff from the Yangtze River. And the dominating factors of eutrophication in 2006 were CODMn, PO43--P, NO3--N, TN and chl-a in the Yangtze River Estuary and its adjacent area.

Abstract: Abstract. In order to optimize the dosage and improve the coagulation effect when Yangtze river with low temperature and low turbidity was treated by conventional treatment in the winter, pilot study of enhanced conventional treatment was conducted by dosing two coagulant respectively and returning sludge in sedimentation tank to flocculant tank, so the optimal ratio of sludge return and the impacts of sludge return on effluent turbidity in sedimentation tank and the remove effect of COD_Mn was discussed. The results indicates that the optimal sludge return ratio for Yangtze river in winter is 8%. Under 8% sludge return ratio ,the dosage is reduced from 12mg/L (under no sludge return) to 3mg/L~6 mg/L, and dosage is saved 50%~75%. When dosing respectively 3mg/L~6 mg/L composite coagulant and 3mg/L~6 mg/L polymeric aluminum chloride, it can make average effluent turbidity in sedimentation tank decrease to 3.7NTU~2.4 NTU ,8.1NTU~4..4 NTU respectively and the average removal rate of turbidity and COD_Mn can reach up to 94.3%~96.3%, 89.9%~94.5%,30.8%~39%,32.5%~38.6% respectively, so the requirement of effluent turbidity in sediment tank is met. Comparing to the treatment effect under no sludge return condition, sludge return can not only improve the treatment effect but also reduce the dosage greatly.