Neng Zhu

Preparation, characterization, and phenol adsorption of activated carbons from oxytetracycline bacterial residue

The oxytetracycline bacterial residue–activated carbon (OBR-AC) prepared from oxytetracycline bacterial residue with K2CO3 under chemical activation was studied. The effects of activation temperature, activation time, and activation ratio on the specific surface area (SSA) and methylene blue adsorption (MBA) were studied. Characterization of the optimum OBR-AC was performed by using scanning electron microscopy (SEM), pore structure (PS,) and Fourier-transform infrared spectroscopy (FT-IR). The optimum parameters were as follows: 800°C activation temperature, 3 hr activation time, and 1:3 activation ratio. The SSA and MBA under optimum conditions were 1593.09 m2/g and 117.0 mg/g, respectively. Adsorption equilibrium and kinetics data were determined for the adsorption of phenol from the synthetically prepared phenol solution. The results showed that the Langmuir model gave the best fit for equilibrium isotherm, whereas the kinetics data were well fitted by the pseudo-second order model. Implications In the past, the bacterial residues have been used for feed additives in China. Unfortunately, doubts of its suitability as a feedstock have been raised because of the small amount of antibiotics, a large number of the fermentation by-products and metabolic products and by-products remaining in the bacterial residues. So Oxytetracycline Bacterial Residue (OBR) is one of hazardous wastes in China. In order to solve the problem of OBR, the preparation of OBR-AC is studied, and OBR-AC under optimum operation parameters is characterized by Scanning Eldctron Microscopy (SEM), Pore Structure (PS) and Fourier Transfer-Infra Red (FT-IR). Moreover, the phenol adsorption isotherms and kinetics models for OBR-AC under optimum operation parameters are studied.

Analysis of Energy-Saving Design of Glass Curtain Wall in the Terminal

Airport Terminal has some unique architectural features, however, there is no design standard for Airport Terminal. In this paper, first, on the basis of researches and field tests, we make the dynamic load simulation using TRNSYS and analyze the characteristics of load of the Airport Terminal. We find the solar radiation has great impact on the building energy consumption. Second, we analyze the impact of sunshade and g-value on solar radiation. We find the L0 (L0=L/H) of southward should less than 0. 5, g-value should not be too small. Through this work, we hope to give a guide to the design of the Airport Terminal.

A Case Study of an Optimization Retrofit of the Heat Supply System in a Campus of Tianjin

According to the phenomenon of insufficient utilization of the geothermal water in the heat supply system of a campus in Tianjin, an optimization retrofit scheme with cascade utilization of the geothermal water is introduced in this paper. The energy efficiency of the heat supply system was improved after the retrofit: 30% of the electricity consumption was saved and an extra building area of 120,000 m2 could also be served by the same heat supply system.

Optimization of Regulation Methods in District Heating Systems

The widely use of the heating system results in the sharp increase of the heating energy consumption. The optimization of the regulation methods for the heating system can efficiently save energy and improve the indoor temperature of the heat users. The traditional regulation methods include quality regulation, quantity regulation, intermittent regulation etc. The actual operation mode was compared with the actual operation mode, which proved that the traditional regulation methods were all static theoretical regulation methods. The regenerative property of the buildings was simulated using the fluent software. A new regulation method which is called quantitative regulation method is proposed in this paper.

Experimental Research on Human Metabolism in Hot Environment

In this study, the body metabolic rate of 10 volunteers performing light, medium and heavy physical labor was examined under different climatic conditions in a chamber. The climatic conditions referred to one group of comfort environment (25°C dry bulb temperature and 50% relative humidity) and three groups of thermal environment (30°C, 35°C, 40°Cdry bulb temperature and 90% relative humidity). The results reveal that for the same labor intensity, the human metabolic rate increases with the rise of environment temperature in the scope of 30~40 °C, 90%RH. The impact of environment temperature on metabolic rate increases with the rise of labor intensity. In addition, the classification of physical labor intensity upgrades when the environment temperature exceeds a certain threshold

Study on Assessment of High Temperature and Humidity in Working Environment on Human Health

In this study, a series of references on human physiology and psychology response to hot and humid environments were analyzed. On basis of the thermo metabolism system, energy metabolism system, cardiovascular system and respiratory system, impact mechanism of high temperature and humidity on human health was presented. The results indicate that the high temperature and humidity in working environment have significant impact on human health. The high temperature and humidity cause the reducing of temperature difference in vitro and in vivo, the difficult of metabolic heat diffusion, the significant increasing of energy metabolism and oxygen consumption, heart failure, hypoxia and other physiological responses.

Comparative study of cooling tower performance evaluation indicators

This paper describes three cooling tower evaluation indicators. By using three different evaluation methods which includes the contrast method of cooling water, cooling capability and efficiency coefficient, the performance of cooling towers is evaluated. Compare and analyze the evaluation results, we find they are not consistent. This paper analyzes the causes of different results, summarizes the application scopes and limitations of each evaluation indicator and puts forward some suggestions for the cooling tower evaluation.

Experimental Analysis of Controlling Pollutants by the Convergent Jet Air Curtain

In order to solve the problem of ventilation systems and pollution control systems where exist pollutants, taking into account the traditional sealed enclosures or partial enclosures, and other pollutants in exhaust hood to control the collection rate is very low. As the collection rate of the Traditional closed cover and local cover which control pollutants is poor, besides that, the energy consumption is Large, based on The actual needs of field and laboratory, the Prototypes and experimental models of Convergent air curtain generator have been set up. And with them univariate and multivariate orthogonal experiments have also been made. Through a large number of experimental analyses, the most Optimal parameters has been got, and the Theoretical model of Convergent jet air curtain. Based on the experimental and theoretical analysis, with the Case studies and Under the conditions of heat radiation of the convergent flow air curtain jet, Comparing with the static test, it has been found that Convergent air curtain makes the room temperature, dust and pollutant concentration, the concentration of air pollutants and energy consumption have been greatly reduced. The theoretical model and experimental results has some reference value and significance on environmental protection, labor protection and health protection related to protection design.

Research Progress on Organic Pollution in the Indoor Air of Urban Residences in China

This review summarizes the organic pollution in the indoor air of Chinese urban residences according to the order of time. Generally, Chinese researchers paid more attention to organic pollutants such as formaldehyde, the benzene series and polycyclic aromatic hydrocarbons (PAHs) in dwellings. Their concentrations were analyzed in urban residences, especially in newly decorated residences on the basis of field tests previously reported in the Chinese literature. The results indicate that there are obvious differences in the concentrations of the same kind of components in different urban residences. The concentrations in excess of the concentration limits for formaldehyde, the benzene series exist in the initial stage following completion of interior decoration. The concentrations of the different components for PAHs are obviously different in urban dwellings.

Measurement and Evaluation for Productivity in Extreme Hot Environment

The productivity in extreme hot environment is not only influenced by the complexity of the task and the technical proficiency of the workers, but also closely related to the heat stress caused by the hot environment. In this study, three methods of productivity measurement were introduced, mainly referred to their applications and limitations. The method of using thermal sensation vote was based on the subjective feelings, and its application was convenient. The method of using wet-bulb globe temperature was based on the environment parameters and working time. It can be applied to a wide range of high temperature. While the method of using predicted mean vote had more comprehensive considerations of environment parameters and thermal sensation, but the complexity measurement of the environment parameters limited the usefulness of this method. Different from the three methods, this study proposed the physiological stress index to be the argument in the calculation of productivity. The physiological stress index combines both the environmental intensity and labor intensity. It reflects physiological conditions of the workers directly and has the potential to predict the productivity online.