Applied Mechanics and Materials Vols. 580-583

Abstract: The article deals with the ways of dealing with the concept of drinking water supply in the event of emergencies and crisis situations. The contribution defines concepts related to crisis planning, describes preventive measures to ensure a prompt resolution of a situation, solution to minimize the damage caused by the incident and, last but not least, the possible ways of ensuring the supply of drinking water in emergency situations.

Abstract: To do a research about raw water eutrophication of water plants in Hangzhou, samples of raw water in Jiuxi, Xiangfu, Nanxing, Qingtai Plant were collected and analyzed to get more than 10 water quality indexes. Turbidity, DO, COD, TN, NH₃-N and CHL-a serving as example. supported by GIS, integrated fuzzy evaluations of raw water eutrophication in July and December were completed applying entropy weight method. The result shows that in terms of the nutrient degree, Xiangfu is the most qualified while the least one is Qingtai. Overall, raw water in December is of higher quality than July.

Abstract: The paper deals with the calculation of the contact time of waste water in the body of feed in the biofilter to determine the optimum settings.

Abstract: UV/TiO₂ photocatalytic of filtrated water are conducted in S waterworks which take Yangtze River as its source water in Nanjing. Self-made glass supported nano-TiO₂ film and photocatalytic reactor are used for the experiment. Results show that TOC removal efficiency can reached 45% -63% within 2h-3h, Organic matter removal efficiency is positively related with the • OH generated in photocatalytic process. The influence factors on TOC removal efficiency follows the sequence: light intensity, dissloved oxygen, reaction time and pH. Changes of UV absorption characteristics in photocatalytic process indicate that the saturation of organic matter increase significantly, this is conductive to control the risk taken by disinfection by-products. Results proved that UV/TiO₂ photocatalytic is a promising technology for the removal of organic pollutants in drinking water, it can improved the chemical safety of drinking water.

Abstract: Prestressed Concrete Cylinder Pipe (PCCP) consists of a steel cylinder lined with concrete, then helically wrapped with a wire and coated with a dense mortar. PCCP has excellent structural properties, so it is widely used in various water-transportation projects around world. This paper presents a review of development of PCCP in China, which was summarized as three stages: the period of exploratory development, the period of cooperative development, and the period of independent development. The development process of design and production technique, the application in China, the construction and development prospect of PCCP were made a detailed discussion in each stage.

Abstract: The paper investigates the optimal parameters of the single-sludge denitri-nitrification system and their compliance with the existing wastewater treatment plants in Russia

Abstract: The compound micro-polluted groundwater was treated by three-stage contact oxidation filters with total 1.5m ceramic layer. The filtration rates, in accordance with the time sequence, were respectively 1m/h, 1.5m/h, 2m/h, 3m/h and 4m/h. The result indicated that, in the condition of sufficient dissolved oxygen, the effluent concentration of iron, manganese, ammonia nitrogen and COD_Mn can met the National Drinking Water Standards. Under the range of filtration rates the average effluent concentration was respectively that 0.073 mg/L, 0.278 mg/L, 0.229 mg/L, 0.172 mg/L and 0.199mg/L for iron; 0.150 mg/L, 0.180 mg/L, 0.110 mg/L, 0.150 mg/L and 0.359 mg/L for ammonia nitrogen. The average concentration of manganese was 1.828mg/L with dropping aeration only, compare with that 0.323mg/L with strengthening aeration under filtration rate 1m/h. And the manganese concentration was 0.061mg/L, 0.062 mg/L, 0.084 mg/L and 0.071 mg/L, respectively under the range of filtration rates of 1.5-4m/h by strengthening aeration. Because of the biological system in filter layer no perfect, humic acid and low temperature, the average removal rate of COD_Mn was only 16.10% under the 1m/h filtration rate. Then when the rates were up to 1.5m/h-3m/h, effect of COD_Mn removal increased and the water treated met the Standard with the maturity of filter layer. But under the rate 4m/h COD_Mn concentration of effluent was exceed the Standard. Meanwhile, in the range of 1m/h-3m/h, consumption of dissolved oxygen respectively were 19.26mg/L, 14.73mg/L, 13.99mg/L and 13.99mg/L.

Abstract: With the rapid development of chinese economy,to speed up the modernation of the society more and more ultra-high-rise-building rise abruptly.This article as Liuhe square project in Shengzhen city an example,elaborated the water supply system, drainage system,and fire fighting system design in water supply and drainage system design.

Abstract: Taking the raw water of Yangtze Chenhang Reservoir as the research object, the characterization of diatomaceous earth, and the removal efficiency of COD_Mn, turbidity by precoat filtration process were investigated by pilot experiment in this paper. The results showed that diatomaceous earth patterns having porous structure and the pure silica peak at 2θ angles 21.980, 36.080, 31.460 and 28.430 in XRD analysis. Precoat filtration has a good stability to remove solid suspended particle, effluent turbidity was remained about 0.05NTU. Precoat filtration had no effect on removing COD_Mn. The pressure of 50KPa could be defined as a critical point in this experiment. Beyond the critical point, the devices should be stop and backwash, to resume operation pressure. Overall, precoat filtration can be defined as a filtration technique for relatively low turbidity raw waters.

Abstract: The paper presents the innovative decision of the problem of choosing the most effective pipe renovation method among the wide range of them. To solve this problem a computer program called “Repair 2012” was developed. The factors influencing the selection process of optimal renovation method for pressure and non-pressure pipes and the theoretical base for creating a computer program are described. The program algorithm based on weighted analysis of these factors. Weighting coefficients for each factor are calculated using arithmetical mean for all concerning trenchless methods. The income and outcome user information, the sequence of the process of working with the program are represented in the article. The process and results on determining an optimal renovation method are shown as an example.