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The two major techniques of conservation agriculture – no-till and straw mulch – are widely used in agricultural activities. Many studies have investigated the response of soil respiration to conservation agriculture. However, there are few studies estimating soil CO2 emissions in sloping cropland. For this research we selected typical sloping cropland in China’s semiarid Loess Plateau region. The...
Greenhouse gas (GHG) emissions from municipal solid waste (MSW) management significantly contribute to high global warming potential (GWP). However, most studies have failed to facilitate identifying MSW management schemes capable of comprehensively meeting the goals from decision-makers at different hierarchical levels under uncertainties. This study develops an inexact bi-level linear programming...
Spectral characteristics of optically active constituents (OACs) in waters are key parameters of biooptical modeling. Comparative analyses about the differences of optical characteristics and composition between riverine and reservoir waters in the second Songhuajiang River tributaries were conducted, and the influencing factors impacting on chromophoric dissolved organic matter (CDOM) and organic...
To exam ine the residues and distributions of hexachlorocyclohexanes (HCHs), dichlorodiphenyltrichloroethane (DDT), and other organochlorine pesticides (OCPs ) in the Weihe River basin of northwest China, a gas chromatography-mass spectrometer (GC-MS) was employed to analyze the samples collected from surface water, suspended solids, and sediments. Results showed that total concentrations of HCHs,...
The aim of this study was to assess the effect of sodium alginate-immobilized bacteria and ultrasonic assistance on the biodegradation of oestrogens in soil. The studied oestrogens were oestrone (E1), oestradiol (E2), oestriol (E3), 17α-ethinylestradiol (EE2), and bisphenol-A (BPA). A central composite design was developed to determine the optimal conditions of the three variables (ultrasound time,...
Five species of beans were chosen to observe the effects of intermittent periods and doses of cell phone electromagnetic field radiation (EMR) on germination seeds. Beans were grown under the same environment and the EMR was different. The treatment included two intermittent periods (4 and 24 h) and three radiation intensities (high, low, and check). The frequency of EMR was 1805-1850 MHz. The mean...
Peanut hull powders were chemically modified using mercaptoacetic acid to develop a convenient, lowcost, and highly efficient adsorbent for the removal of Hg(II) from aqueous solutions. A pseudo-second-order rate equation fitted the kinetic data better than a pseudo-first-order rate equation did for both the raw and the mercapto-modified peanut hull powder. The equilibrium data for both the raw and...
Preferential flow is important for solute transport in soil. This study aims to investigate distribution characteristics of preferential flow paths in agricultural land and to determine the effects of preferential flow on nitrate nitrogen transport. Dye tracer experiments were conducted on two farmland plots in Changping County, Beijing. Two undisturbed soil columns (with preferential flow) and two...
Anthropogenic and agricultural activities are deteriorating drinking water quality of the Siling reservoir. Spatio-temporal variations and risk assessment of select heavy metals (Zn, Cu, Mn, Fe, Cr, Cd, and Pb) were investigated in water samples. During summer Mn (37.32 μg/L), Fe (41.0 μg/L), and Cd (1.18 μg/L) concentrations were higher in the water samples, while the concentrations of Zn (86.12...
The aim in this study was to assess relationships between men exposure to lead and semen-quality parameters in an environmental pollution site. We recruited 95 men through the pollution area and two controls. We measured semen quality using computer-aided semen quality analysis, and lead levels in seminal plasma using graphite gurnace atomic absorption spectroscopy. The results showed that the semen...
In our work a two-stage A/O system consisting of two independent A/O subsystems was used to remove high concentrations of COD, nitrogen, and toxic matter from mixed wastewater discharged by a comprehensive chemical group. The mixed liquid return was not adopted, and the sludge return ratio was kept at a high value of 100-200% to maintain high usable activated sludge concentration. Adequate NaHCO₃...
We tested the seed loss of five dominant species in the Loess Plateau region under varied rainfall intensity and soil surface conditions. The runoff rate, sediment yield, seed loss rate, and seed displacement distance were investigated. The result indicated that the seed loss rate increases with rain intensity enhanced, or the rainfall duration prolonged even with low intensity. The grass, and grass...
Adsorption and desorption of sulfamethoxazole (SMX) at water-sediment interfaces from Taihu Lake, China, were investigated in this study. The effects of a cationic surfactant, cetyltrimethylammonium bromide (CTAB), and an anionic surfactant, sodium dodecylbenzene sulfonate (SDBS), on the adsorption/desorption processes were also studied. Results show that adsorption and desorption could be well described...
We studied the removal of K-2BP from aqueous solution by cetyltrimethylammonium chloride-modified bentonite with polyacrylamide flocculant (CTAC-bentonite/PAM). The preliminary results disclose that the CTAC modification method can potentially enhance the removal efficency of bentonite and, by combination with PAM, the adsorbed bentonite can settle within a short sedimentation time. In addition, alkaline...
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