Bio-augmented activated sludge treatment of potato wastewaters     

R. -Li Yu Yeh  Yung-Tse Hung 《洁净——土壤、空气、水》1988,16(2):213-220

A laboratory study was conducted to determine the effect of bacterial augmentation with LLMO (liquid live microorganisms) on the activated sludge treatment of potato wastewaters. Completed mixed activated sludge bench scale reactors were used in this study. Parameters varied during the continuous reactor run included hydraulic detention time, LLMO addition, and powdered activated carbon addition. The hydraulic detention time lasted 1, 2, and 3 days, while the sludge age was maintained at 10 days for both reactors. The bio-augmented reactor had a better COD removal than the non-bio-augmented reactor at a lower MLVSS level in the reactor. It is concluded that bacterial augmentation with LLMO improved slightly the COD removal efficiency in treating potato wastewaters with the activated sludge process. The bio-augmentation increased the substrate removal rate, increased the oxygen utilization, and decreased the excess sludge production.  相似文献   

Speciation of dissolved selenium in the Kaoping and Erhjen rivers and estuaries,southwestern Taiwan   总被引：2，自引：0，他引：2  

J. J. Hung  C. P. Shy 《Estuaries and Coasts》1995,18(1):234-240

Analytical methods of dissolved Se species in river water and seawater were established and applied to study dissolved Se speciation in the Kaoping and Erhjen rivers and estuaries, southwestern Taiwan. The Kaoping and Erhjen rivers and estuaries were respectively in relatively oxygenated and oxygen-deficient conditions as revealed from the distributions of dissolved oxygen, DOC, nutrients, and dissolved Mn. Concentrations of dissolved total Se increased downstream in the riverine sections, ranging from 0.6 nM to 1.2 nM for the Kaoping River and from 0.8 nM to 1.05 nM for the Erhjen River. The dissolved total Se was only slightly higher in the Erhjen middle estuary than in the Kaoping middle estuary in spite of heavier pollution in the former. The dissolved total Se behaved rather conservatively in the Kaoping estuary but nonconservatively in the Erhjen estuary resulting from anthropogenic inputs, and in this respect showed similarities with the behavior of redox-sensitive Mn. The predominant species of selenium were Se(VI) and organic Se in the Kaoping River and Se(VI) in the Kaoping estuary. The elevated concentration of Se(VI) in the Kaoping estuary may stem from the degradation of organic Se and oxidation of Se(IV). On the other hand, Se(IV) and organic Se were equally dominant in the Erhjen River, and Se(IV) was predominant through most of the Erhjen estuary. The elevated distribution of Se(IV) in the Erhjen middle estuary may result mostly from partial decomposition of organic Se, but further oxidation of Se(IV) was inhibited in reducing waters. However, Se(VI) became dominant at Erhjen outer estuary where water was oxygenated by the replacement of intruded coastal seawater. Apparently, the speciation of dissolved Se was mainly controlled by the biological and redox processes in the Kaoping and Erhjen rivers and estuaries.  相似文献   

A GIS Process for Delimitating Areas Potentially Endangered by Debris Flow     

Fan-Chieh Yu  Chien-Yuan Chen  Tien-Chien Chen  Feng-Yi Hung  Sheng-Chi Lin 《Natural Hazards》2006,37(1-2):169-189

A GIS rules-based approach is proposed for delimiting areas potentially endangered by debris flow for downstream guarded areas. Data were used to define rules for nine pilot areas in the Chen-You-Lan river watershed in Nantou County of Taiwan. A preliminary regressed relationship between debris volume and runout distance in the pilot areas is first formulated. The GIS processes for applying the rules are linked to delimit hazardous areas affected by debris within the first approximated debris fan. Rules applied to delimit potentially endangered areas incorporate geomorphological factors (gradient or curvature, aspect), direction of flow, fan angle of the debris and location of the overflow points. The delimited zone is then calibrated using the regression formula for debris volume against the affected area. The verification of the delineation of the areas using the adopted approach, with reference to micro-geomorphological results concerning pilot cases validates the proposed model. The model can be used to delineate potentially hazardous zones approximately associated with debris flow in rivers in Taiwan.  相似文献   

Newly found Tunglo Active Fault System in the fold and thrust belt in northwestern Taiwan deduced from deformed terraces and its tectonic significance     

Yoko Ota  Yu-nong Nina Lin  Yue-Gau Chen  Hui-Cheng Chang  Jih-Hao Hung 《Tectonophysics》2006,417(3-4):305-323

We found active faults in the fold and thrust belt between Tunglo town and the Tachia River in northwestern Taiwan. The surface rupture occurred in 1999 and 1935 nearby the study area, but no historical surface rupture is recorded in this area, suggesting that the seismic energy has been accumulated during the recent time. Deformed fluvial terraces aid in understanding late Quaternary tectonics in this tectonically active area. This area contains newly identified faults that we group as the Tunglo Fault System, which formed after the area's oldest fluvial terrace and appears at least 16 km long in roughly N–S orientation. Its progressive deformations are all recorded in associated terraces developed during the middle to late Quaternary. In the north, the system consists of two subparallel active faults, the Tunglo Fault and Tunglo East Fault, striking N–S and facing each other from opposite sides of the northward flowing Hsihu River, whose course may be controlled by interactions of above-mentioned two active faults. The northern part of the Tunglo Fault, to the west of the river, is a reverse fault with upthrown side on the west; conversely the Tunglo East Fault, to the east, is also a reverse fault, but with upthrown side on the east. Both faults are marked by a flexural scarp or eastward tilting of fluvial terraces. Considering a Quaternary syncline lies subparallel to the east of this fault system, the Tunglo Fault might be originated as a bending moment fault and the Tunglo East Fault as a flexural slip fault. However, they have developed as obvious reverse faults, which have progressive deformation under E–W compressive stress field of Taiwan. Farther south, a west-facing high scarp, the Tunglo South Fault, strikes NNE–SSW, oblique to the region's E–W direction of compression. Probably due to the strain partitioning, the Tunglo South Fault generates en echelon, elongated ridges and swales to accommodate right-lateral strike–slip displacement. Other structures in the area include eastward-striking portion of the Sanyi Fault, which has no evidence for late Quaternary surface rupture on this fault; perhaps slip on this part of Sanyi Fault ceased when the Tunglo Fault System became active.  相似文献   

Impact of climate change on water resources in Yongdam Dam Basin,Korea     

Byung Sik Kim  Hung Soo Kim  Byung Ha Seoh  Nam Won Kim 《Stochastic Environmental Research and Risk Assessment (SERRA)》2007,21(4):457-373

The main purpose of this study is to investigate and evaluate the impact of climate change on the runoff and water resources of Yongdam basin, Korea. First, we construct global climate change scenarios using the YONU GCM control run and transient experiments, then transform the YONU GCM grid-box predictions with coarse resolution of climate change into the site-specific values by statistical downscaling techniques. The downscaled values are used to modify the parameters of a stochastic weather generator model for the simulation of the site-specific daily weather time series. The weather series is fed into a semi-distributed hydrological model called SLURP to simulate the streamflows associated with other water resources for the condition of 2CO₂. This approach is applied to the Yongdam dam basin in the southern part of Korea. The results show that under the condition of 2CO₂, about 7.6% of annual mean streamflow is reduced when it is compared with the current condition. Seasonal streamflows in the winter and autumn are increased, while streamflow in the summer is decreased. However, the seasonality of the simulated series is similar to the observed pattern An erratum to this article can be found at  相似文献   

Impact of the thermal state of the tropical western Pacific on onset date and process of the South China Sea summer monsoon     

黄荣辉  顾雷  周连童  吴尚森 《大气科学进展》2007,24(1):E1-E1

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Effect of fines content on soil freezing characteristic curve of sandy soils     

Vu  Quoc Hung  Pereira  Jean-Michel  Tang  Anh Minh 《Acta Geotechnica》2022,17(11):4921-4933

Acta Geotechnica - Soil freezing characteristic curve (SFCC) represents the relationship between soil temperature and unfrozen water content of soil during freezing and thawing processes. In this...  相似文献   

Geoblocks Recognition and Delineation of the Earthquake Prone Areas in the Tuan Giao Area (Northwest Vietnam)     

N. H. Tuyen  Ph. V. Phach  R. B. Shakirov  C. D. Trong  Ph. N. Hung  L. D. Anh 《Geotectonics》2018,52(3):359-381

The goal of the paper is to reveal the hierarchical block structure in the Tuan Giao area (Northwest Vietnam) and, on that base, to identify areas prone to earthquakes with M ≥ 5. Four large geoblocks of the second rank have been delineated on the basis of the joint analysis of geological, geophysical, geomorphic, and remote sensing data. The second rank geoblocks have been divided into smaller sub-blocks of the third rank. The recent geodynamics of the geoblocks have been characterized using geomorphic, seismological, gravity, and GPS data.The system of the delineated geoblocks is viewed as the Geodynamic Blocks model. The areas prone to earthquakes with M ≥ 5 have been identified using the pattern recognition algorithm CORA-3. The objects of the recognition were defined as circular areas, where boundaries of the geoblocks intersect each other. The recognition results confirm high seismic potential of the study region and provide information on potential earthquake sources for seismic hazard assessment: a number of boundary intersections have been identified as areas prone to earthquakes with M ≥ 5, where events of such magnitude have not been recorded up to date. Mordern geothermal activity and anomalies of dissolved methane (up to 10000 nL/L), helium and hydrogen in the hot mineral water springs prove high permeability of the study area and its active seismo-tectonic state.  相似文献   

Examining the role of social media in California’s drought risk management in 2014   总被引：1，自引：0，他引：1  

Zhenghong Tang  Ligang Zhang  Fuhai Xu  Hung Vo 《Natural Hazards》2015,79(1):171-193

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Petroleum hydrocarbons, polycyclic aromatic hydrocarbons, organochlorine pesticides and polychlorinated biphenyls in tissues of Indo-Pacific humpback dolphins from south China waters     

Leung CC  Jefferson TA  Hung SK  Zheng GJ  Yeung LW  Richardson BJ  Lam PK 《Marine pollution bulletin》2005,50(12):33-1719

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