Advanced Materials Research Vols. 183-185

Abstract: The carp was used to prepare fish protein hydrolysate in the article. The results demonstrated that the optimum conditions for preparation of hydrolyzed fish protein with Neutrase by orthogonal test are as follows: the temperature is 50°C, the enzyme content is 2.0%, the pH value is 7.5, the hydrolyzed time is 5 hours, the weight ratio of meat to water is 1:6. Under the conditions, the recovery of hydrolyzed protein was 94.28%.

Abstract: Humic acid and aromatic organic compounds (AOCs) detected generally in source water recently could react with chlorine during drinking water treatment process to generate disinfection by-products (DBPs), such as trihalomethanes (THMs) and haloacetic acids (HAAs). To simulate the real contaminated water, in the samples containing humic acid, 1,3-benzenediol, 1,4-benzenediol, 1,2-benzenediol, phenol and benzoic acid as representative AOCs were added to conduct chlorination test in order to analyze the impacts of some factors on the formation of THMs and HAAs. The research results indicated that THMs concentration increased with pH but HAAs concentration decreased with pH, and chlorine time, temperature and chlorine dosage all had the functional relationships with the formation of THMs and HAAs. These results could provide the valuable information for the effective control of DBPs during drinking water treatment operation.

Abstract: Characteristics of anaerobic granules before and after acclimation were studied using glucose as co-substrate. Removal efficiencies of 2,6-dinitrophenol (2,6-DNP) using two different co-substrates were investigated in two lab-scale UASB reactors. Granular sludge acclimatized to the wastewater containing 2,6-DNP through 3 months. After acclimation, SEM pictures of the granular biomass showed that Filamentous bacteria were the predominant bacteria on the surface of granules. Throughout the study of 2,6-DNP anaerobic degradation with different co-substrates, influent COD concentration was kept constant as about 2500 mg l^-1. Maximum 2,6-DNP concentration was 170.0 mg l^-1 and 2,6-DNP removal efficiencies were always more than 98.0% using glucose as co-substrate, keeping hydraulic retention time (HRT) as 35 h. When using sodium acetate as co-substrate and keeping HRT as 30 h, maximum 2,6-DNP concentration was up to 189.5 mg l^-1 and over 99.2% 2,6-DNP removal efficiencies could be obtained.

Abstract: Adsorption removal of a cationic dye, rhodamine B (RhB) from water onto rectorite and sepiolite was investigated. The rectorite and sepiolite were characterized by Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM). Attempts were made to fit the isothermal data using Langmuir and Freundlich equations. The experimental results have demonstrated that the equilibrium data are fitted well by a Freundlich isotherm equation. Pseudo-first-order and pseudo-second-order models were considered to evaluate the rate parameters. The experimental data were well described by the pseudo-second-order kinetic model. The results indicate that the rectorite exhibited higher adsorption capacity for the removal of RhB than sepiolite and could be employed as a low-cost alternative in wastewater treatment for the removal of cationic dyes.

Abstract: Using the invention patent technology (patent number ZL2005 1 0131175.7), the impact on environment in ductile iron production was studied. By using the environmentally friendly and adjustable spheroidizing equipment, the spheroidization can proceed in a completely closed state. The smoke with the spheroidization is eliminated just as the production of inoculated cast iron. The pressure in the ladle can be automatically adjusted from 0KPa to 8.62KPa and the absorption rate of elements is improved. Without sacrificing the spheroidizing level and mechanical properties, the amount of added nodularizer can be decreased by 0.2%-0.5%. Saving the costs and protecting the environment.

Abstract: This study filled polyurethane foam in SBR as micro-organisms immobilized carrier, formed a sequencing batch biofilm reactor (SBBR). It applies the immobilized microbial technology to SBBR, under the A/O operation mode，we cultivate them in order to study the effect of the technology of nitrogen and phosphorus removal in the domestic sewage. The carrier which was used in the SBBR, created aerobic - anoxic - anaerobic micro-environment in space, and appeared a good performance of simultaneous nitrification and denitrification (SND). The results show that adding this kind of carriers in SBBR, successfully achieved a goal in the field of nitrogen and phosphorus removal. The average removal rates of COD_Cr, NH₄⁺-N, TN and TP is respectively 84.23%、96.94%、58.40% and 91.38%.

Abstract: Quantitative RSIM (Remote Sensing Information Model) was studied to retrieve the vegetation factors (vegetation cover and biomass) for desertification assessment by using the data of state-produced hyperspectral resolution imagining spectrometer (OMIS-I), and the corresponding vegetation factors recoding maps based on pixel were obtained. The result shows that it is reliable to retrieve quantitatively the vegetation cover and the biomass by the data of hyperspectral resolution imagining spectrometer. When there are both the shrub and the grassland in the retrieved region, the precision of the polynomial model is obvious higher than that of the linear model, contrastingly when the type of the vegetations is simplification, the linear model has the higher precision. The quantitative retrieving of the vegetation factors are related to the vegetation type.

Abstract: In this study, a new strain was isolated by us based on its efficiency to decolorize azo dyes. Identification of this isolate by 16S rDNA technique revealed that the strain belonged to Escherichia, and clustered within Escherichia coli. According to this, we renamed our strain as E. coli CD-2. The strain CD-2 could decolorize azo dyes effectively under aerobic conditions. CD-2 exhibited good decolorization ability in the pH range from 3 to 11, temperature from 30°C to 42°C and salinity from 1% to 4%. CD-2 could decolorized different azo dyes (methyl red, Congo red, eriochrome black T and eriochrome red B) within 16h, and the decolorizing rate were 97.15%, 86.03%, 56.92% and 81.14%, respectively. This degradation potential increased the applicability of this strain for the azo dye removal.

Abstract: Interactions among proteins are the basis of various life events. So, it is important to recognize and research protein interaction sites. A control set that contains 149 protein molecules were used here. Then 10 features were extracted and 4 sample sets that contained 9 sliding windows were made according to features. These 4 sample sets were calculated by Radial Basis Functional neutral networks which were optimized by Particle Swarm Optimization respectively. Then 4 groups of results were obtained. Finally, these 4 groups of results were integrated by Genetic Algorithm based Selected Ensemble (GASEN) and better accuracy was got. So, the integrated method was proved to be effective.

Abstract: After analyzing its importance and difficult points in actual situation, the effectiveness of implementing separated collection, including the source separate and manual sorting, for municipal solid waste (MSW) was evaluated by using a cost-benefit model. Then the preliminary research and case study on the critical conditions to carry out separated collection was discussed based on the recoverable garbage proportion of MSW in more than dozens of cities. It was concluded that, when the total proportion of four kinds of primary recoverable garbage reaches 30% in MSW, it would be appropriate for implementing separated collection. The result could provide some references for the decision-making on carrying out separated collection of MSW in different cities.