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2013 Vol.33 Issue.2,Published 2013-02-20
193 Changes of particulate matters during rain process and influence of that on chemical composition of precipitation in Hangzhou, China
HAN Yan, XU Hong, BI Xiao-Hui, LIN Feng-Mei, JIAO Li, ZHANG Yu-Fen, FENG Yin-Chang
Rainwater and atmospheric particle samples were collected from June, 2008 to June, 2009 in Hangzhou, which is located in the most serious acid rain pollution areas of China. To research the effect of atmospheric particles on the chemical composition and acidity of precipitation during washout process under cloud, particle sampling was carried out before, during and after rain processes. The variations of TSP and PM10 before, during and after rain processes were analyzed to explore the scavenging effect on particles by rain. Principle component analysis was used to analyze the origin of main ions in precipitation. TSP and PM10 showed certain acid buffer capacity with A-value of 1.95 and 1.02, respectively. According to the variations of particles’ concentration, acid buffer capacity and chemical compositions in three (before, during and after) rain processes, it can be concluded that rain has significant washout effect on the alkaline components in particles. Combine with the rain principal component analysis, particulate matters made a significant contribution to Ca2+ and Na+, and little contribution to NH4+, SO42- and NO3-, its contribution to Mg2+ and K+ needed to be further validated, F- and part of Cl- were mainly originated from rainout process and washout of gaseous pollutants.
2013 Vol. 33 (2): 193-200 [Abstract] ( 361 ) [HTML 1KB] [ PDF 757KB] ( 1544 )
201 Aerosol optical properties during the typical haze/fog event in Nanjing
WANG Jing, NIU Sheng-Jie, XU Dan, YU Xing-Na
The aerosol optical properties during haze/fog event were analyzed in the north suburb of Nanjing in the winter of 2010 by using direct solar irradiance and sky radiance of CE318 sun-photometer. Under the influence of haze/fog, the aerosol optical depth (AOD) showed a higher value. The values of AOD at 440, 675, 870 and 1020 nm varied from 0.16 to 0.43 before the haze and fog episodes, increased to 0.31~0.84 during the haze/fog influencing periods and reduced to 0.19~0.48 after the haze/fog process. The higher single scattering albedo (SSA) occurred in haze/fog influencing periods with value of 0.89~0.91. The imaginary part of complex refractive index decreased after the fog/haze days. These results suggests that the enhancement of scattering ability and the decrease of absorption ability of local aerosols. During the haze/fog episodes, the aerosol size distribution come from the addition of coarse aerosol particles and the contribution of the anthropogenic fine particles. The volume concentration of coarse mode increased by 2.5 times, with the lower value of 0.033 μm3/μm2 before the outbreak of the fog/haze process and 0.082 μm3/μm2 during the fog/haze influencing periods. The volume concentration of fine mode also increased by 90% compared to the before the events.
2013 Vol. 33 (2): 201-208 [Abstract] ( 337 ) [HTML 1KB] [ PDF 681KB] ( 1304 )
209 Effect of conductivity on the performance of electro-dewatering of municipal sludge
DONG Li-Wen, WANG Cheng-Wen, ZHANG He-Qing, WANG Yu-Jue
The performance of electro-osmotic method for dewatering municipal sludge was investig. The effect of sludge conductivity on dewatering efficiency and energy consumption was evaluated via adding Na2SO4 and washing by deionized water to adjust the conductivity. The results showed that with increase in Na2SO4 dosage, the sludge moisture decreased from 51.2% to 45.7% after 20min of electro-dewatering. However, the energy consumption increased by 23.3%~69.2% with increasing conductivity. Decreasing the sludge conductivity by deionized water washing resulted in a slight increase in the final moisture of sludge from 52.3% to 53.1% after 20 min of electro-dewatering. However, the energy consumption decreased considerably by 15%~24%. The results indicate that electro-dewatering is a suitable dewatering method for sludges of low conductivity.
2013 Vol. 33 (2): 209-214 [Abstract] ( 253 ) [HTML 1KB] [ PDF 420KB] ( 1473 )
215 The start-up strategy of shortcut nitrification in SBR under low ammonia at room temperature
LI Dong, LIU Li-Qian, WU Di, ZHANG Gong-Liang, GAO Wei-Nan, ZHANG Zhao, ZHANG Jie
The start-up of nitrosationin SBR was analyzed with different seeding sludge strategy and influent. The results showed the quickly start up of nitrosation when seeding nitrosation sludge with low dissolved oxygen (DO=0.30mg/L) and no accumulation of nitrite when seeding nitrification sludge after 29days (58 cycels) operation.The rate of nitrosation could be above 60% in 27days (54 cycles) when alternative high-low dissolved oxygen was adopted.No nitrite was accumulated when seeding nitrification sludge under low dissolved oxygen (DO=0.30mg/L),with the effluent of A/O biological phosphorus removal process with the C/N of 0.40~0.93 after 32 cycles, while the start-up of nitrosation was realized with the influent from septic tanks with the C/N of 3.50~5.34.
2013 Vol. 33 (2): 215-220 [Abstract] ( 231 ) [HTML 1KB] [ PDF 371KB] ( 678 )
221 Study on a TiO2-nanopore-array-based photocatalytic fuel cell using organic wastewater as substrates for electricity generation
吕Shu-Bin , LI Xue-Jin, QIN Yu, LI Jin-Hua, LIU Yan-Biao, ZHOU Bao-Xue
In this paper, a photocatalytic fuel cell system was designed using a high-performance TiO2 nanopore array electrode as anode and a Pt-black/Pt electrode as cathode for generation of electricity and simultaneously wastewater treatment. Various model compounds including the refractory compounds as well as real wastewater samples were used as substrate for the PFC system. The results showed that the PFC generated the excellent cell performance,for example,when acetic acid(0.05mol /L) as the substrateof the PFC, produces open-circuit voltage (Voc)1.16V, short-circuit current density (Jsc) 1.28 mA /cm2 and maximum power density( (JV)max) 0.28mW/cm2.
2013 Vol. 33 (2): 221-226 [Abstract] ( 234 ) [HTML 1KB] [ PDF 461KB] ( 1242 )
227 Screening of phosphate-removing filter media for use in constructed wetlands and their phosphorus removal capacities
WANG Zhen, LIU Chao-Xiang, DONG Jian, LIU Lin, LI Peng-Yu, ZHENG Jia-Yu
According to the characteristics of swine wastewater, physico-chemical properties of oyster shell (OS), broken bricks, volcanics, and zeolite were determined, as well as their phosphorus removal capacities. The results showed that, broken bricks and zeolite showed more suitable potential environments for biofilm bacterial growth, whereas OS and broken bricks possessed of high potential capacities for phosphorus removal. OS had the highest phosphorus adsorption value by isothermal adsorption tests, followed by broken bricks, volcanics, and zeolite, the type of adsorption of PO43- on OS was defined as chemical adsorption, the types of adsorption of PO43- on broken bricks, volcanics, and zeolite were defined as physical adsorption, and the process that occurred during phosphorus adsorption on broken bricks was understood to be chemical adsorption. OS was most effective at phosphorus removal in the dynamic adsorption experiments, followed by broken bricks, volcanics, and zeolite. Besides, the main phosphorus removal pathway of each filter medium was determined by the contents and chemical forms of elements in the filter medium. In conclusion, OS should be the ideal filter medium used in constructed wetlands treating swine wastewater.
2013 Vol. 33 (2): 227-233 [Abstract] ( 271 ) [HTML 1KB] [ PDF 372KB] ( 907 )
234 The effects on the trichloroethylene sorption behaviors caused by the interactions between different sorption domains in model organic-mineral complexes
SU Si-Hui, HE Jiang-Tao, SHI Yu-Ting, ZHANG Xiao-Liang
In order to research the sorption behavior effect of the complexes on organic pollutants, organic matters/minerals (C/M) montmorillonite-humic acid complexes and mixtures soil samples with different ratios were prepared to represent interactions and non-interactions between montmorillonite and humic acid respectively. A series of batch experiments were carried out to determine the sorption behavior of trichloroethylene (TCE) on the organic-mineral complexes and mixtures. Results showed that the adsorption isotherms of TCE fit the Freundlich adsorption model. By using the superposition of adsorption equation of montmorillonite and humic acid, the theoretical value of the adsorbed TCE amount in solid phase was calculated to represent the soil samples which were made up by non-interactions between montmorillonite and humic acid. The theoretical value of the adsorbed TCE amount in solid phase were all smaller than the actual values in the adsorption of complexes and mixtures, indicating that there were interactions between the two sorption domains in the complexes, which lead to some change in the properties of humic acid. And this enhanced the adsorption capability of complexes. At the same time, mixtures transformed into complexes to some extent, due to the participation of water in the process of isothermal adsorption. The adsorption capability of complexes and mixtures on TCE was enhanced with the increasing of C/M. The adsorption capability of complexes was higher than the mixtures when the C/M was lower than 0.08. This suggested that the changing of humic acid properties enhanced the adsorptioncapability of complexes. However, when the C/M was higher than 0.08, more organic matter were added on the patch, which would keep the original characteristics. This part of humic acid would cover up the influence taken by those denatured humic acid. Therefore, the adsorption capability of complexes and mixtures were almost the same. When the C/M of the complexes was fixed, the difference ?Qe, which calculated from the theoretical value of nonlinear superposition mode and the actual value, increased with the initial aqueous-phase solute concentration (C0) of TCE. This suggested that denatured humic acid had higher affinity for TCE than other components in the complexes. The sorption contribution of denatured humic acid increased with the increasing of C0.
2013 Vol. 33 (2): 234-242 [Abstract] ( 256 ) [HTML 1KB] [ PDF 529KB] ( 619 )
243 Studies on the active oxygen species of Cu0.05Ce0.95O catalyst for soot combustion——promoting effect of plasma.
欧Yang-Jie-Hong , LIN Jun-Min, LIU You-Fa, FU Ming-Li, HUANG Bi-Chun, WU Jun-Liang, CHEN Li-Min, YE Dai-Qi
The plasma effect of Cu0.05Ce0.95-CA catalyst on surface structure and species was characterized by TPO, H2-TPR, O2-TPD, XRD, BET and XPS. The results showed that the catalytic soot combustion activity is enhanced in plasma region. It displayed the best catalytic activity by 9kV voltage. The ignition temperature is 243.1℃ and the maximum oxidation temperature is 302.8℃, decreased by 65.1℃ and 92.7℃ by no plasma. Larger specific surface area and smaller crystallite size of Cu0.05Ce0.95-CA catalyst is emerged by plasma. With the help of plasma, the dispersion of CuO is increased. Meanwhile more Cu2+ enter into the lattice of CeO2 and more mixed oxides Cuy2+Ce1-y4+O2-y2-□y are formed on the surface of Cu0.05Ce0.95-CA catalyst . More reactive oxygen species were formed and its fluxion, movement and transmission can promote the growth of oxygen vacancies circularly, which can promote the catalytic soot combustion activity persistently.
2013 Vol. 33 (2): 243-250 [Abstract] ( 246 ) [HTML 1KB] [ PDF 654KB] ( 959 )
251 Study on the elimination of OCPS from micro-polluted water by enhanced coagulation
LI Zong-Shuo, LIU Peng-Yu, CHANG Qing, ZHAO Li, GAO Cai-Li
The elimination of OCPs in micro-polluted water by enhanced coagulation was studied with poly aluminum chloride (PAC) and poly ferric sulfate (PFS) respectively. The effects of dosage of coagulant, pH value,initial turbidity, temperature and adding the modified attapulgite on the elimination efficiencies of OCPS were tested. Under the condition of pH5~6 and PAC 14mg/L, the removal rates of OCPS and turbidity reached 57.03~74.83% and 98.18%. The removal rates of OCPS and turbidity increased with the increasing in initial turbidity. Low temperature was conducive to the removal of OCPs.The removal rates of OCPS were enhanced to different extent when activated carbon and attapulgite were added respectively as the coagulation aids. The removal rate of OCPS reached 47.4%~78.2% and 22.8%~79.5%under the condition of modified attapulgite and activated carbon dosage of 5mg/L.Modified attapulgite is superior to activated carbon in low dosage. The removal rate of DDT is beter than BHC in the coagulation progress.The removal rates of OCPS treated with PFS were higher than that of with PAC.
2013 Vol. 33 (2): 251-256 [Abstract] ( 190 ) [HTML 1KB] [ PDF 502KB] ( 513 )
257 Degradation of levofloxacin by sonolysis-assisted H2O2 in aqueous solution
WEI Hong, LI Juan, LI Ke-Bin, HU Da
An ultrasonic/H2O2 system was used to degrade levofloxacin, and some influencing factors such as H2O2 concentration, ultrasonic power and initial pH value were investigated. The results indicated that the ultrasonic/H2O2 system had a marked synergetic effect in the removal rate of levofloxacin compared with the single ultrasonic and the oxidation of H2O2. The degradation rate of levofloxcin increased with the increase of H2O2 concentration in the range of 3.0~20.0mmol/L, and an ultrasonic power of 260W could result into the optimum degradation rate. The degradation amount of levofloxacin increased with the increase of its initial concentration. The degradation rate of levofloxcin could reach a maximum value at initial pH 7.14 of the unbuffered solution. The high performance liquid chromatography spectrum results showed that two main products were generated during the reaction, however, which were dependent on the pH value of the solution.
2013 Vol. 33 (2): 257-262 [Abstract] ( 288 ) [HTML 1KB] [ PDF 456KB] ( 940 )
263 The effect of sodium alginate on the coagulation rate and flocs formation of modified clay
LIN Yong-Xin, CAO Xi-Hua, SONG Xiu-Xian, YU Zhi-Ming
In present study, we used sodium alginate as a model compound to investigate the effect of algal organic matters (AOMs) occurred during algal blooms on the coagulation rate and flocs formation of modified clay. The flocculation kinetics of modified clay particles at various concentrations of sodium alginate solutions were studied. And the flocs fractal dimension was calculated by image analysis software to assess the morphologic features of the flocs semi-quantitatively. Our results indicate that the coagulation rate of modified clay and the fractal dimension of flocs are lower than that of control when the concentration of sodium alginate is below 10mg/L. In the range of 10-100mg/L, sodium alginate can improve the coagulation rate of modified clay; the flocs fractal dimension and flocs strength increase steadily to a peak and then decrease. The optimum concentration of sodium alginate is 50mg/L, along with the maximum cogulation rate of 44.13 and the flocs dimension of 1.6823 respectively. While, the flocs fractal dimension and coagulation rate decreased when the concentration of sodium alginate is higher than 100mg/L,resulting in subsequent increase of the flocs voidage.
2013 Vol. 33 (2): 263-269 [Abstract] ( 307 ) [HTML 1KB] [ PDF 574KB] ( 679 )
270 Effect of organo–mineral complexes on adsorption characteristic of phosphorus on sediment
WANG 而Li, WANG Si-Qi, JIANG Ming-Xuan
Effect of organo–mineral complexes on adsorption characteristic of phosphorus on sediment was investigated by batch experiments of equilibrium adsorption. Results indicated that the sorption capacity on the sediment reduced dramatically after humus was removed, Normalized sorption capacity and partition coefficient only accounted for 35.62% and 9.93% of original sample, and organo–mineral complexes was a main factor in phosphorus sorption on sediment.The normalized carbon sorption capacity of Ca-bound humus was 1157.05mg/kg, which was 1.27 times of original sample, and adsorption mechanism was micro-hole function filling. The normalized carbon sorption capacity of Fe/Al-bound humus was 1736.82mg/kg, which was 1.88times of original sample, It plays an important role in phosphorus adsorption, and adsorption mechanism may be coordination adsorption apart from micro-hole function filling. Taking into account the adsorption capacity was not only organic matter content, but also existent state of organic matter, and it was also a main factor in sorption characteristic of phosphorus on sediment. When regarding original sample as a basic standard, adsorption capacity of phosphorus on Ca bound humus and Fe/Al bound humus were estimated in accordance with 1.27and 1.88 times.
2013 Vol. 33 (2): 270-277 [Abstract] ( 198 ) [HTML 1KB] [ PDF 509KB] ( 777 )
278 Microbial flocculant MBFGA1 preliminary structure identification and research on flocculation mechanism
ZHANG Yuan-Yuan, YANG Chao-Hui, ZENG Guang-Ming, WANG Li-Ke, HUANG Jing, WEI Shu-Mei, FENG Jing
With the flocculating rate of kaolin as index, flocculating activity analysis of various components in fermentation liquor was conducted, and it was confirmed that MBFGA1 fine product was nuclear effective component of the micro-bioflocculant. MBFGA1 fine product was acquired through purificating the coarse product(obtained from fermentation liquor by acetone extraction) using sevage reagent, identified to be polysaccharides employing full spectra scan, phenol sulfuric acid method and coomassie blue staining, and separated as MBFGA1-1 and MBFGA1-2 through twice gel chromatography separation filter. The structure of MBFGA1, MBFGA1-1 and MBFGA1-2 was analyzed adopting ESEM, EDS, FTIR, HPLC and GC. Results demonstrated that MBFGA1 had a linear long chain molecular structure, in which α-glucosidic bonds primarily existed among monosaccharides, and perssads with good effect of coagulation such as hydroxyl, carboxyl, methoxy;MBFGA1-1 was homogenous with the weight of 1.18′106D and mainly composed of xylose, mannose, glucose (0.3:1:1.09), and a bit of rhamnose; MBFGA1-2 with the molecular weight of 3.08′103D, and rhamnose, xylose, mannose, galactose and glucose (0.68:0.28:1.82:1:3.73) as its monosaccharide formation. The main flocculating mechanism was adsorption bridging, meanwhile the high molecular weight and polar groups made the long chain structure molecules well stretched, and played good role in adsorption bridging.
2013 Vol. 33 (2): 278-285 [Abstract] ( 285 ) [HTML 1KB] [ PDF 696KB] ( 895 )
286 Screening and characteristics of an efficient nitrobacterium
WANG Xiao-Ju, HE Chun-Ping, WANG Zhen, XING Chuan-Hong, SONG An-Dong, CHEN Hong-Ge
A nitrobacterium N4 was isolated from SBR activated sludge using selective media. Its nitrification rate reached (52.0±3.5)mg/(L·d) measured by analyzing the residual NO2- content in culture medium using both colorimetry and ion chromatography method. The N4 strain was identified to belong to the genus of Azoarcus based on its morphological, physiological, and biochemical characteristics, as well as 16S rDNA phylogenetic analysis. After acclimated under 15℃, the stain got the ability to transform NO2- to NO3- completely in 8 days at 15℃ when the inoculation amount was 10%, with a nitrification rate of more than 120.7mg/(L·d). Investigations about nitrification characteristics of the acclimated strain N4-L showed that it had the highest nitrification ability under the conditions of pH 8.0, 2g/L of glucose, and 1g/L of NaNO2. DGGE analysis of N4-L and activated sludge in winter was performed by extracting their total DNA followed by amplifying the V3 variable region of 16S rDNA respectively. The result showed that N4-L was not the dominant bacterium in the activated sludge, which suggested that making N4-L the dominant species in SBR system by some strategies may provide an effective way to improve the nitrogen removal efficiency of SBR system in winter.
2013 Vol. 33 (2): 286-292 [Abstract] ( 224 ) [HTML 1KB] [ PDF 569KB] ( 1367 )
293 Effects of Fenton oxidation with ultrasonic coupling on sludge particle size and soluble substances
GONG Chang-Xiu, JIANG Jian-Guo, YANG Shi-Hui
The study was conducted to evaluate the effect of ultrasonic on the performance of Fenton oxidation in sludge treatment in terms of sludge particle size, soluble substances and polysaccharide and protein in the supernatant. Both Fenton oxidation and ultrasonic coupled Fenton oxidation significantly increased the specific surface area of sludge, decreased the average particle size and sauter average diameter. Sludge flocculated structure was dramatically destroyed and the dewatering process was enhanced by both treatments. Fenton oxidation increased the concentration of SCOD in sludge by 3.9 times from 120.45mg/L to 585.47mg/L, while ultrasonic coupled Fenton oxidation resulted in an increase by 5.4 times from 120.45mg/L to 767.47mg/L. Ultrasonic coupled Fenton oxidation doubled the concentration of polysaccharide in the supernatant from 209.74mg/L to 433.68mg/L, which are 2.6 and 6.5 times more than the concentration of polysaccharide in the crude sludge respectively. For both oxidation treatments, the concentration of protein in the supernatant was decreased after a short increase.
2013 Vol. 33 (2): 293-297 [Abstract] ( 249 ) [HTML 1KB] [ PDF 305KB] ( 541 )
298 Stabilization treatment of available arsenic in contaminated soils and mechanism studies
LU Cong, LI Qing-Qing, LUO Qi-Shi, LIU Li-Li, ZHANG Chang-Bo
Lime and Ferrous salt was used as the auxiliary agent and stabilizing agent to treat two arsenic contaminated soils. Following chemical leaching test, the stabilizing effectiveness and mechanism of available arsenic on treated soil were shown using morphology and structure analysis. Importantly, the stabilizing efficiency of arsenic for the two types of soils were both over 85% when the ratio of exogenous Fe and soil As (mol/mol) was 6:1~8:1 and the dosing ratio of CaO was 0.05% ~ 0.1% (w/w). The stabilization of arsenic in soil was attributed mainly to two following reasons: (1) arsenic was transformed from non-specific adsorption and the specific adsorption state into the weakly crystalline Fe-Al or Fe-Mn hydrated oxides and (2) crystalline Fe-Al or Fe-Mn hydrated oxides state. The new phase of hydroxyl arsenic copper mineral (As2Cu5H4O12) was generated after the stabilization treatment of the contaminated soils.
2013 Vol. 33 (2): 298-304 [Abstract] ( 274 ) [HTML 1KB] [ PDF 675KB] ( 1556 )
305 The different roles of ammonium and nitrate in the bloom self-maintenance of Lake Taihu
ZHOU Tao, LI Zheng-Kui, FENG Lu-Lu
2013 Vol. 33 (2): 305-311 [Abstract] ( 248 ) [HTML 1KB] [ PDF 387KB] ( 820 )
312 The concentration and seasonal variation of organophosphorus pesticide residues in the Pearl River estuary
ZHOU Min, SHI Lei, LI Qu-Sheng, YANG Xuan
2013 Vol. 33 (2): 312-318 [Abstract] ( 231 ) [HTML 1KB] [ PDF 531KB] ( 821 )
319 Water pollution characteristics and pollution sources of Bei Canal river system in Beijing
JING Hong-Wei, ZHANG Zhi-Gang, GUO Jing
2013 Vol. 33 (2): 319-327 [Abstract] ( 252 ) [HTML 1KB] [ PDF 599KB] ( 2036 )
328 Water quality effects of two aquatic macrophytes on eutrophic water from Lake Dianchi Caohai
WANG Zhi, ZHANG Zhi-Yong, ZHANG Jun-Qian, WEN Xue-Zheng, WANG Yan, LIU Hai-Qin, YAN Shao-Hua
2013 Vol. 33 (2): 328-335 [Abstract] ( 257 ) [HTML 1KB] [ PDF 496KB] ( 924 )
336 Investigation of the typical antibiotics in the sediments of the Yongjiang River, Nanning City, South China
WU Ting-Ting, ZHANG Rui-Jie, WANG Ying-Hui, LENG Bing, XUE Bao-Ming, LIU Xiang, LIN Wei-Dong
2013 Vol. 33 (2): 336-344 [Abstract] ( 213 ) [HTML 1KB] [ PDF 688KB] ( 852 )
345 The cancer risk assessment of the elderly population exposure to PAHs in PM10 indoor air——Case study of one community in Tianjin, China
CAO Wen-Wen, ZHANG Zhen-Jiang, ZHAO Ruo-Jie, HAN Bin, ZHANG Nan, BAI Zhi-Peng
2013 Vol. 33 (2): 345-350 [Abstract] ( 292 ) [HTML 1KB] [ PDF 391KB] ( 1014 )
351 Investigation of indoor radon concentration and g radiation levels in Chengdu Area
XU Li-Peng, GE Liang-Quan, GU Yi, ZOU Gong-Jiang, WANG Zhuo, ZHU Guo-Zhen
2013 Vol. 33 (2): 351-356 [Abstract] ( 212 ) [HTML 1KB] [ PDF 404KB] ( 729 )
357 Residential indoor-outdoor relationships of PM10 and elements in Tianjin
ZHANG Zhen-Jiang, ZHAO Ruo-Jie, CAO Wen-Wen, ZHANG Nan, HAN Bin, BAI Zhi-Peng
2013 Vol. 33 (2): 357-364 [Abstract] ( 254 ) [HTML 1KB] [ PDF 489KB] ( 850 )
365 A study on heavy metals in household dusts in 3 cities in Southwestern China
LI Xiao-Yan, XIE Xin-Jie
2013 Vol. 33 (2): 365-371 [Abstract] ( 239 ) [HTML 1KB] [ PDF 386KB] ( 813 )
372 Reduce the influence of wind turbine noise by applying acoustical control technology to engine room
FANG Lin, DI Guo-Qing, LI Zheng-Guang, QI Hai-Jun
2013 Vol. 33 (2): 372-376 [Abstract] ( 223 ) [HTML 1KB] [ PDF 631KB] ( 768 )
377 The strategy and policy framework for water pollution control in China during the Twelfth Five-Year Plan period
MA Le-Kuan, WANG Jin-南, WANG Dong
2013 Vol. 33 (2): 377-383 [Abstract] ( 222 ) [HTML 1KB] [ PDF 458KB] ( 1119 )
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