Water quality characteristics of forest rivers around Lake Biwa

2001 ◽  
Vol 43 (5) ◽  
pp. 183-192 ◽  
Author(s):  
S. Fujii ◽  
I. Somiya ◽  
H. Nagare ◽  
S. Serizawa
Keyword(s):  
Water Quality ◽  
Cluster Analysis ◽  
Organic Matter ◽  
Lake Biwa ◽  
Ionic Species ◽  
Quality Characteristics ◽  
Mineral Species ◽  
River Quality ◽  
Ionic Components

Forest river surveys were carried out at upper streams of several rivers in the Lake Biwa watershed to understand the water quality characteristics of the rivers, and to find out their relationships with forest features such as geographical, geological and vegetational data. The results showed: (1) Forests have some purification functions for nitrogen and organic matter, but become sources for most of ionic species. (2) Main mineral species in forest rivers are Ca2+, Mg2+ and Na+, HCO3–, CO32–, Cl–, SO42– and SiO2. (3) Loading from forests was 0.4–7 kg/km2/d for TN and 0.01–0.3 kg/km2/d for TP. (4) River quality reflects the properties of each forest, and is unique to the place, especially in ionic species such as Ca2+ and Cl–. (5) A cluster analysis successfully categorized ionic components into several groups.

Quantitative comparison of forests and other areas with dry weather input loading in the Lake Biwa catchment area

2002 ◽  
Vol 45 (9) ◽  
pp. 183-193 ◽  
Author(s):  
S. Fujii ◽  
H. Tanaka ◽  
I. Somiya
Keyword(s):  
Water Quality ◽  
Lake Biwa ◽  
River Mouth ◽  
Weather Conditions ◽  
Ionic Species ◽  
Concentration Difference ◽  
Forest Sites ◽  
Catchment Areas ◽  
Unit Loading ◽  
River Mouths

For the evaluation of pollutants loading to Lake Biwa, comprehensive river surveys on river mouths and forest sites were conducted 9 times from 1996 to 1999, on 25–40 main rivers in the Lake Biwa watershed. The main results obtained are as follows. (1) River water quality reflects regional characteristics of their catchment areas, and the concentration difference among rivers ranged between 2–3 fold. (2) Concentration variation shows different patterns with time and location depending on water quality indices used. (3) Indices related to organic matter and nutrients have lower correlation between forests and river mouths, but those related to ionic species showed strong correlation. (4) Flux comparison of forest and river mouth sites suggests that pollutants from catchment areas are conveyed to the lake not only through rivers but also underground. (5) In dry weather conditions, forests contribute 30% to the whole pollutants (TN, TP, and TCODMn) loading, and the remainder is derived mainly from paddy fields and residential/commercial zones. (6) Unit loading factors from forests are estimated as 640, 57 and 1200 kg/km2/y, respectively for TN, TP and TCODMn, while those from other areas are estimated as 2,500, 208 and 4,200 kg/km2/y.

Linking optical properties of dissolved organic matter to multiple processes at the coastal plume zone in the East China Sea

2016 ◽  
Vol 18 (10) ◽  
pp. 1316-1324 ◽  
Author(s):  
Yulin Jiang ◽  
Jianfu Zhao ◽  
Penghui Li ◽  
Qinghui Huang
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Optical Properties ◽  
Dissolved Organic Matter ◽  
East China Sea ◽  
Quality Characteristics ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Multiple Processes

This study investigated the multiple processes at the coastal plume zone by water quality characteristics and dissolved organic matter optical properties.

scholarly journals Modeling and characterization of natural organic matter and its relationship with the THMs formation

2016 ◽  
Vol 18 (4) ◽  
pp. 803-816 ◽  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Organic Carbon ◽  
Natural Organic Matter ◽  
Formation Mechanism ◽  
Quality Characteristics ◽  
High Rate ◽  
Disinfection Process ◽  
By Products

<p>Natural organic matter (NOM) has been identified as the prominent precursor for disinfection by-products (DBPs) formation during chlorination. Various studies have shown that the characteristics of NOM influence the Trihalomethanes (THMs) formation mechanism. The present study represents NOM categorization in terms of total organic carbon (TOC), dissolved organic carbon (DOC), UV absorbance at 254 nm wavelengths (UV<sub>254</sub>) and specific ultraviolet absorbance (SUVA) to investigate the effects of NOM on THMs formation mechanism. The high rate of dependency was found for each representative of NOM with respect to water quality characteristics and operational condition of disinfection process. Values of SUVA and UV<sub>254</sub> is drastically reduced with respect from higher to a moderate chlorine dose which represent the chlorine contact is more predominant with hydrophobic fractions of NOM. The value of SUVA is decreasing with respect to temperature and reaction time, which reveled higher rate of utilization for hydrophobic fractions of NOM. Predictive modeling approach was carried out using multiple regression analysis with the combination of two surrogates at each stage of modeling with help of operational condition of disinfection process and water quality characteristics. The R<sup>2</sup> value of the model was found in the range of 0.927 to 0.937 from the developed model and a model could be recommended for prediction of THMs in drinking water.</p>

scholarly journals Ionic Components in Tap Water of Kyoto, Osaka and Kobe Cities, Reflecting Characteristics of the Lake Biwa-Yodo River Water Quality.

Eisei kagaku ◽  
1996 ◽  
Vol 42 (1) ◽  
pp. 67-73
Author(s):  
MASANORI SEMMA ◽  
YOSHIO ITO ◽  
KATSUHIKO NAKAMURO ◽  
YASUYOSHI SAYATO
Keyword(s):  
Water Quality ◽  
River Water ◽  
Lake Biwa ◽  
Tap Water ◽  
River Water Quality ◽  
Ionic Components

Application of Micro-Flocculation Direct Filtration for Reservoir Water Derived from Yellow River

2011 ◽  
Vol 90-93 ◽  
pp. 2933-2938
Author(s):  
Mei Li ◽  
Ting Lin Huang ◽  
Hong Bo Wang
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Low Temperature ◽  
Removal Efficiency ◽  
Filtration Rate ◽  
Yellow River ◽  
Quality Characteristics ◽  
Reservoir Water ◽  
Direct Filtration ◽  
Filter Layer

Aiming at the water quality characteristics of low turbidity and low temperature of the Reservoir Water derived from Yellow River(RWDFYR), the technology of micro-flocculation direct filtration for RWDFYR was studied. The effluent index such as CODMn, UV254, TOC and turbidity was investigated under the different filtration rate conditions of 4m/h, 5m/h, 6m/h, 8m/h and 10m/h. The results show that the value of removal efficiency of turbidity reached at 98%, and the value of removal efficiency of organic matter was 40% also. In this study, the removal effect was good under the filtration rate of 6m/h. Moreover, the removal effect of different filter layers was also carried out. Finally, it concluded that the backwashing cycle of filter layer should not exceed 3days.

Water Quality Characteristics for Agricultural Reservoirs in Yeongsan River Basin

2020 ◽  
Vol 21 (1) ◽  
pp. 15-23
Author(s):  
Sang-Guen Oh ◽  
Jae-Young Lee ◽  
Jae-Woon Jung ◽  
Ju-Tae Song ◽  
Sang-Yun You ◽  
...  
Keyword(s):  
Water Quality ◽  
River Basin ◽  
Quality Characteristics

Study on Water Quality Characteristics of Mineral Water in Tea Literatures

2017 ◽  
Vol 23 (2) ◽  
pp. 31-39
Author(s):  
Pyong-In Yi ◽  
Jung-hwan Kwon ◽  
So-hui Ko ◽  
Sung-chul Hong ◽  
Yong-jae Lee ◽  
...  
Keyword(s):  
Water Quality ◽  
Mineral Water ◽  
Quality Characteristics
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