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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.

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.

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 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.

Zhang G.,Changjiang River Scientific Research Institute | Zhang G.,Chinese Academy of Sciences | Liu G.,Chinese Academy of Sciences | Yi L.,Hubei Academy of Environmental science | Zhang P.,Changjiang River Scientific Research Institute
Journal of Hydrology and Hydromechanics | Year: 2014

In this paper simulated rainfall experiments in laboratory were conducted to quantify the effects o patchy distributed Artemisia capillaris on spatial and temporal variations o the Darcy-Weisbach friction coefficient (f). Different intensities o 60, 90, 120, and 150 mm h-1 were applied on a bare plot (CK) and four different patched patterns: a checkerboard pattern (CP), a banded pattern perpendicular to slope direction (BP), a single long strip parallel to slope direction (LP), and a pattern with small patches distributed like the letter 'X' (XP). Each plot underwent two sets o experiments, intact plant and root plots (the above-ground parts were removed). Results showed that mean for A. capillaris patterned treatments was 1.25-13.0 times o that for CK. BP, CP, and XP performed more effectively than LP in increasing hydraulic roughness. The removal o grass shoots significantly reduced f. A negative relationship was found between mean for the bare plot and rainfall intensity, whereas for grass patterned plots fr (mean in patterned plots divided by that for CK) increased exponentially with rainfall intensity. The -Re relation was best fitted by a power function. Soil erosion rate can be well described usingby a power-law relationship.

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