Yi L.,Hubei Academy of Environmental science |
Zhang G.H.,Changjiang River Scientific Research Institute |
Wang D.D.,Chifeng University
Water Resources and Environment - Proceedings of the International Conference on Water Resources and Environment, WRE 2015 | Year: 2016
Soil water is critical for plant growth and ecosystem sustainability in China’s Loess Plateau. Monitoring soil water loss in artificial forestlands can provide crucial insight into water regulation and solving supply and demand issues. Based on previous research methods and findings, this paper systematically explored and analyzed the soilwater deficit in different artificial forestlands. The results showed that there was a significant inconsistency between soilwater supply and consumption in artificial forestlands. For different vegetation zones, soil water deficit is lowest in the forest zone, higher in the forest-steppe zone, and highest in the typical steppe zone. Soil water deficit on shady slopes was less than that on sunny slopes, that on lower slope positions less than on upper slope positions and that on gentle slopes less than on steep slopes. The whole soil prof ile also showed differences in water deficit degree, the active layer of water zone was far lower than intense water consumption layer. Additionally, soil water levels changed seasonally. Soil water deficit was less severe during the rainy seasons; however, the deficit was more severe before the rainy season due to increased levels of plant transpiration. © 2016 Taylor & Francis Group, London.
Kou X.-Y.,Hubei Academy of Environmental science |
Liu Y.-J.,Wuhan University of Technology
Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of Technology | Year: 2013
In order to further raise the recovery of a copper ore in Jiangxi, in the light of the ore property and dissemination of symbiosis, a series of reagent system condition test has been completed based on the multielement analysis and phase analysis. Meanwhile middling regrinding process in closed-circuit test has been explored under optimum reagent system conditions. The results show that the concentrate grade of copper is 2.005% and recovery of copper is 88.48% with reasonable reagent system. The result of flotation test indicates that middling regrinding new process is beneficial to raising recovery of copper.
Xiang L.,Wuhan University |
Xiang L.,Hubei Academy of Environmental science |
Zhang X.,Wuhan University |
Lu M.,Wuhan University |
And 2 more authors.
Journal of Analytical Atomic Spectrometry | Year: 2012
A method for preconcentration and determination of ultra-trace germanium is presented in this work. Germanium (Ge(iv) in this work) in the water samples was preconcentrated by applying nano-sized TiO 2 colloid as adsorbent. When the pH values of solution were 6.0-8.0, the adsorption efficiency of nano-sized TiO 2 colloid for germanium reached 97.0 ∼ 99.0% in a short time. After centrifugation, the sediment which contained the concentrated Ge(iv) was inverted to colloid by adding HNO 3 of certain concentration. Ge(iv) in colloid was determined by graphite furnace atomic absorption spectrometry (GFAAS). In this study, germanium was approximately 20 times concentrated and a low detection limit (3σ) of 43 ng L -1 was achieved. As the adsorbed Ge(iv) in colloid could be directly determined by means of GFAAS, desorption process was not needed, which simplified the process. This method was applied for the determination of ultra-trace germanium in water samples and satisfactory results were obtained. © 2012 The Royal Society of Chemistry.
Luo Z.,Wuhan University |
Li L.,Wuhan University |
Li L.,Hubei Academy of Environmental science |
Yu J.,Hubei Academy of Environmental science
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | Year: 2015
The chlorobenzene (CB) desorption characteristics on clay matrix at room temperature condition were investigated to examine the CB's migration under a low concentration of ethanol. To find out if the CB polluted the soil (clay) of the Chemical Factory at Wuhan, Hubei Province, China, three series of experiments were performed in this study. The first is the best leaching filtering condition. The second is the verification of the result of the best leaching condition and the third is testing the desorption kinetics of CB on clay. The results show that the solution to soil ratio (mL/g) was 25:1 and ethanol concentration of 10% had the best leaching condition at 2 h at the room temperature. Moreover, the extraction rate of the chlorobenzene in soil was 90% under the best leaching condition. It was found that all desorption isotherm data of CB in clay could be best described with Freundlich equations. Using a low concentration of ethanol to restore the CB polluted clay is practicable. It can prevent secondary pollution while retaining the soil function as well. ©, 2015, China University of Geosciences. All right reserved.
Zhang Q.,Hubei Academy of Environmental Science |
Liu B.,Central Analytical Laboratory |
Liu Y.,Fudan University
Environmental Technology (United Kingdom) | Year: 2014
The effect of ozone dose on algae (Microcystic aeruginosa), algal extracellular organic matters (EOM), humic acids (HA) and four model compounds: bovine serum albumin (BSA), starch, deoxyribonucleic acid (DNA) and fish oil as precursors for disinfection by-products (DBPs) production was investigated. Algae showed the highest DBPs formation (71.8 μg mg-1 total organic carbon (TOC)) than other samples. Only BSA showed lower chloroform yield (5.9 μg mg-1 TOC) than haloacetic acids, HAAs (11.2 μg mg -1 TOC). Algae, EOM, starch, DNA, fish oil and HA all showed higher chloroform yields (46.1, 23.8, 8.9, 37.1, 44.0 and 33.7 μg mg-1 TOC, respectively) than HAAs (25.7, 20.2, 6.3, 10.0, 13.1 and 18.4 μg mg -1 TOC, respectively). Pre-ozonation increased DBPs, especially chloroform, formation from algae and DNA significantly. With the increase in ozone doses, DBPs yields of algae and DNA increased 19.0 and 34.5 μg mg -1 TOC, chloroform yields of algae and DNA increased 15.3 and 30.4 μg mg-1 TOC, respectively. However, pre-ozonation decreased DBPs formation from starch, fish oil and HA, and the corresponding decrease amount was 2.4, 26.9 and 9.5 μg mg-1 TOC, respectively. There are no regular change trends of DBPs formation from EOM and BSA with the increase in ozone doses. © 2014 Taylor & Francis.
Liu Y.,Chang'an University |
Zuo K.,Chang'an University |
Yang G.,Hubei Academy of Environmental science |
Shang Z.,Chang'an University |
Zhang J.,Sanmenxia Mining Development Center
Journal Wuhan University of Technology, Materials Science Edition | Year: 2016
A great amount of red mud generated from alumina production by Bayer process was considered as a low-grade iron ore with a grade of 5wt% to 30wt% iron. We adopted the reduction roastingmagnetic separation process to recover ferric oxide from red mud. The red mud samples were processed by reduction roasting, grinding and magnetic separating respectively. The effects of different parameters on the recovery rate of iron were studied in detail. The optimum techqical parameters were proposed with 700 °C roasting for 20 min, as 50wt% carbon and 4wt% additive were added. The experimental results indicated that the iron recovery and the grade of total iron were 91% and 60%, respectively. A novel process is applicable to recover ferric oxide from the red mud waste fines. © 2016, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.
Zhang Q.,Hubei Academy of Environmental Science |
Liu B.,Central Analytical Laboratory
Advanced Materials Research | Year: 2013
The variation of disinfection by-products (DBPs) at several stages of drinking water treatment plants was investigated in two drinking water plants. The results clearly indicate that the low molecular weight total organic carbon (TOC) which has been identified as primary precursor for chlorinated DBPs was difficult to remove by coagulation. Plant A which used conventional coagulation/sedimentation could not decrease the species of trihalomethanes (THMs) and haloacetic acids (HAAs) formation potential. Biological activated carbon (BAC) was applied in Plant B which removed the maximum amount of TOC, while more kinds of microbial products were produced in BAC unit which could be the potential precursors of DBPs. Therefore, the species of DBPs formation potential still increased in the treatment processes of Plant B. Because different components of organic precursors produced different DBPs species, the processes of Plant B could decrease TOC efficiently but the species of THMs and HAAs formation potential. © (2013) Trans Tech Publications, Switzerland.
Yang Q.,CAS Wuhan Institute of Hydrobiology |
Yang Q.,University of Chinese Academy of Sciences |
Xie P.,CAS Wuhan Institute of Hydrobiology |
Shen H.,CAS Wuhan Institute of Hydrobiology |
And 3 more authors.
Water Research | Year: 2012
There are many concerns over the environmental consequences of river regulation in China, such as the Three Gorges Project and the South-to-North Water Diversion Project (SNWDP). In this study, however, we attempted to find the positive role of these constructions in solving environmental problems. We explored the possibility for preventing downstream diatom blooms by using the water storage in the Danjiangkou Reservoir. And we developed a flushing strategy accessing the proper flushing time and water quantity to control the diatom growth. First, we set up a Generalized Additive Model (GAM) to analyze the dynamics of the bloom-formation species, Stephanodiscus hantzschii, in response to the environmental variation. The model took into account the time lags between the biovolume and the environmental parameters. The model indicated that, air temperature explained the most variance in biovolume, followed by soluble reactive silicon (SRSi), turbidity, TP, dam release, PAR, pH and total nitrogen (GAM, R 2 = 0.759). Afterwards, we applied the model to a new predictive dataset, in which values were simulated according to the assumed dam release and air temperature. The GAM predicted fewer releases for flushing by using this dataset than the measured data, implying a prospect of saving water when using this strategy. Finally, we drew a contour map to present the operating procedure of this strategy. Our flushing strategy is to regulate the dam release above a critical value dependent on the air temperatures predicted over the following few days. © 2012 Elsevier Ltd.
Zhang G.H.,Changjiang River Scientific Research Institute |
Zhang G.H.,Chinese Ministry of Water Resources |
Zhang G.H.,CAS Institute of Soil and Water Conservation |
Liu G.B.,Chinese Ministry of Water Resources |
And 3 more authors.
Journal of Arid Land | Year: 2014
Vegetation patterns are important in the regulation of earth surface hydrological processes in arid and semi-arid areas. Laboratory-simulated rainfall experiments were used at the State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Yangling, northwestern China, to quantify the effects of Artemisia capillaris patterns on runoff and soil loss. The quantitative relationships between runoff/sediment yield and vegetation parameters were also thoroughly analyzed using the path analysis method for identifying the reduction mechanism of vegetation on soil erosion. A simulated rainfall intensity of 90 mm/h was applied on a control plot without vegetation (C0) and on the other three different vegetation distribution patterns: a checkerboard pattern (CP), a banded pattern perpendicular to the slope direction (BP), and a single long strip parallel to the slope direction (LP). Each patterned plot received two sets of experiments, i.e. intact plants and roots only, respectively. All treatments had three replicates. The results showed that all the three other different patterns (CP, BP and LP) of A. capillaris could effectively reduce the runoff and sediment yield. Compared with C0, the other three intact plant plots had a 12%-25% less runoff and 58%-92% less sediment. Roots contributed more to sediment reduction (46%-70%), whereas shoots contributed more to runoff reduction (57%-81%). BP and CP exhibited preferable controlling effects on soil erosion compared with LP. Path analysis indicated that root length density and plant number were key parameters influencing runoff rate, while root surface area density and root weight density were central indicators affecting sediment rate. The results indicated that an appropriate increase of sowing density has practical significance in conserving soil and water. © 2014 Science Press, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.
Li T.,Hubei Academy of Environmental science |
Wang X.,CAS Wuhan Institute of Geodesy and Geophysics |
Wen W.,Hubei Academy of Environmental science |
Li E.,CAS Wuhan Institute of Geodesy and Geophysics
Advanced Materials Research | Year: 2012
The grain fluctuation situation of Hubei was analyzed by calculating the grain fluctuation coefficient from 1990s. And the quantitative correlation between grain production and the water disaster was studied by grey correlation analysis. The results were shown as follows. The main water disaster factors impacting grain production were effective irrigated area and planting structure, the relationship degree of which with grain yield is respectively 0.91 and 0.85 ranking the first two among all the selected factors. It was shown that water disaster influenced the grain yield heavily. © (2012) Trans Tech Publications, Switzerland.