Applied Mechanics and Materials Vols. 368-370

Abstract: In view of the selection problem of sludge disposal method in the process of sewage treatment, this paper presents main influence factors on sludge disposal method in municipal sewage treatment works and establishes the comprehensive evaluation decision model of sludge disposal method. Using the analytic hierarchy process (AHP) to analyze and evaluate sludge disposal method, the relative weights of the influencing factors are determined and the optimal sludge disposal method is obtained. The establishment of this evaluation decision model can provide a scientific basis for the reasonable selection of sludge disposal method.

Abstract: The sludge generated from carbon steel pickling process, containing a large number of metal ions, particularly hexavalent chromium, mercury, lead and nickel ion, which is considered to be a kind of hazardous solid waste. The content of moisture in the sludge is 40.02% to 97.30% ,and pH value is about 7 to 11 ;The content of iron in the sludge is the highest, which is from 14.21% to 50.12% ; Other conventional metal elements like Ca , K, Na and Mg ,their content as follows: 5.93% to 29.93% , 0.011 % to 0.14% , 0 to 0.33% and 0.11% to 1.65 % . The heavy metal elements like Zn, Ni, Mn, Cr, Cu, Hg and Pb, their content as follows: 0.0094% to 4.83%, 0.0063% to 1.129% , 0.0226% to 0.106, 0.0103 % to 0.0647% , 0.0034% to 0.0657% , 0.0017% to 0.0135% and 0.0012% to 0.0038% . The anions like SO₄^2- , Cl^- and PO₄^3-, their contents are 0.18 % to 31.92%, 0.05 % to 4.27%, 16% to 11.61%, respectively. This paper has a certain reference value for the treatment and utilization of carbon steel pickling sludge. This paper has certain reference value when treating and utilizing the plain carbon steel pickling sludge.

Abstract: With copper wastewater as the research object, in sulfide - flocculation process, a comparative study of its wastewater treatment of copper sulfide dosage, type of flocculation, flocculation dosage, stirring time and other conditions. The results show that: in their respective optimum conditions, the flocculation PAC than PFS to pH adaptability, low dosage, copper removal rate reached 97.7%, the reaction solution pH value of 6.5, to achieve "Integrated Wastewater Discharge Standard" (GB8978-1996) emission standards.

Abstract: Prepared the catalyst of diatomite supported Fe (NO₃) ₃ by impregnation method. Using the Phenol wastewater as the research object to study the catalytic performance of catalysts, then determining the preparation conditions of the catalysts; Discussing the best reaction conditions by the catalyst application research was carried through. Research showed that the concentration of active components, calcination time and the temperature had significant impacts on the activity of the catalyst. Under the condition of the active component concentration of 0.2mol/L, soaking time 4h, calcination temperature 300°C could produce high activity Fe (NO₃) ₃/ diatomite catalyst. In treatment of phenol wastewater, the optimized conditions of the catalyst for treating phenol wastewater are as follows: the reaction temperature is 30°C, reaction time is 1h, the dosage of catalyst is 0.6g/mL, oxidant dosage is 30mL/L.

Abstract: Creating comfortable interior microclimate environment with comparatively lower energy consumption is one of the basic aims in building design. Combined with the comprehensive retrofit design practice of Wuhan construction building, the thesis investigates a set of practical building climatic design method which is based on computer simulation and analysis technology. Meanwhile, this article analyses the climatic design strategies of Wuhan construction building, and provides a references for architects in the conceptual design stage in the future.

Abstract: Indoor air quality (IAQ) has been concerned since 1970s in some western countries. Many researchers have studied the effects of air pollution on children's health and evidence suggested that it did contribute significantly to the risk of adverse health in children. Children spend the majority of their time indoors, mostly at home. To study health effects of long-term exposure to indoor air, we conducted a questionnaire survey about indoor environment and children's health status in 2012 on the 4-5 grades children of a primary school in Beijing. The questionnaire was used to collect data on general information of children, living environment, residential equipments and lifestyle and children's health status. We classified the investigated families into several categories according to residential surrounding air pollution, decoration and smoking. Then we observed respiratory symptoms like cough, dyspnea with phlegm, nasal obstruction, asthma and some allergy symptoms in different categories. The results of this survey suggest that indoor air quality is associated with children's health. Morbidity of children's respiratory system symptoms and some allergy symptoms is higher in relatively poor indoor environment.

Abstract: In this thesis, we research on the influence of planning layout to the microclimate. Simulate some settlements planning layout cases by ENVI - met software, comparing and analyzing the results, to conclude each planning layout factors effect rules. The research achievements will make guide for designer.

Abstract: Night ventilation is a passive form of common design method with low cost, easy achievement and operation, research on which will have a very high theoretical and social value. This paper has discussed the principle of night ventilation briefly and reviewed the developing of energy efficiency design structure system for building night ventilation. Based on the above, the author has found the weakness of the current research, and summed up the weak link so as to be contributed to the future research and study.

Abstract: Different arrangement forms of outdoor unit of the multi-evaporator air conditioner are applied to one research object. The essay designs four layout schemes, using the CFD to simulate them, respectively. Optimization results show that the outdoor-machine putted in the east and south direction are reasonable.

Abstract: The gas leakage and capabilities in cavity tail-part can affect the characteristics of ventilated cavity shape, while turbulence models influence directly the function of turbulence and gas-leakage mode in cavity tail-part. To compare the impact of two turbulent models (large eddy simulation (LES) and Renormalization Group (RNG) k-ε) on ventilated cavity shape, FLUENT6.2 software was used to simulate the three-dimensional ventilated cavity flow, taking into account gravity effects, the cavity transient image and pressure distributions along model surface under two turbulence models were also presented. The results show that the results of LES are more consistent with the transient characteristics of ventilated cavity, and are more suitable for simulations of ventilated cavity flow than RNG k-ε model.