New challenges for the management of plant nutrients and pathogens in the Waikato River, New Zealand

2001 ◽  
Vol 43 (5) ◽  
pp. 137-144 ◽  
Author(s):  
W. N. Vant
Keyword(s):  
Water Quality ◽  
Algal Blooms ◽  
Diffuse Sources ◽  
Industrial Wastewaters ◽  
The Past ◽  
Green Algal ◽  
New Challenges ◽  
Better Than ◽  
Waikato River

The water quality of the Waikato River is currently much better than it was in the 1950s. Major improvements in the treatment of the sewage and industrial wastewaters which are discharged to the river mean that levels of indicator bacteria in the lower reaches of the river are now many times lower than in the past. Eve so, conditions are still not suitable for swimming, and blue-green algal blooms occur at times. Non-point or diffuse sources of contaminants now dominate the nutrient and pathogens budgets. Progressively-intensifying farming, particularly in lowland areas, is thought to contribute the majority of the contaminants found in the river. Future improvements in water quality will therefore depend more on activities like changes to farming practice – such as retiring the riparian margins of lowland tributaries of the river – than on further advances in wastewater treatment.

Management and Status of Japanese Public Waters

1991 ◽  
Vol 23 (1-3) ◽  
pp. 1-10 ◽  
Author(s):  
Takeshi Goda
Keyword(s):  
Water Quality ◽  
Coastal Waters ◽  
Industrial Wastewater ◽  
Quality Standards ◽  
Water Bodies ◽  
Industrial Wastewaters ◽  
Quality Of Water ◽  
Japanese Rivers ◽  
Per Capita

The management and status of public water bodies in Japan is discussed. The environmental quality standards which have been set and the levels of compliance with these standards are shown. The water quality of Japanese rivers, lakes, reservoirs, wetlands and coastal waters is described, and eutrophication problems are mentioned. The effects of changes in population density and levels of recycling of industrial wastewaters on the quality of water bodies are discussed. Almost 75% of industrial wastewater is now recycled. Per capita availability of freshwater in Japan is comparatively low, and the construction of 530 dams, in addition to the 2393 dams already in operation, is planned. Irrigation effluents from paddy fields are a major factor which influences river water quality in Japan. The improvement of water quality using various methods is discussed.

scholarly journals KUALITAS LINGKUNGAN PERAIRAN PANTAI DI SEKITAR LOKASI TAMBAK PERIKANAN KECAMATAN GEROKGAK KABUPATEN BULELENG BALI

2020 ◽  
Vol 14 (2) ◽  
pp. 111
Author(s):  
Beny Mustofa ◽  
I Wayan Arthana ◽  
Ni Luh Watiniasih
Keyword(s):  
Water Quality ◽  
Research Method ◽  
Species Abundance ◽  
Field Research ◽  
Dominant Type ◽  
Blue Green Algae ◽  
Sampling Locations ◽  
Quality Of Waters ◽  
Better Than

The purpose of this study was to determine the quality of waters, community structure of phytoplankton and zooplankton around the fishponds waters of Gerokgak Subdistrict. This research was conducted for 2 months, from May to June 2019. There were three sampling locations, namely in Gerokgak, Patas and Sumberkima Villages. The research method used was field research using quantitative analysis of phytoplankton biological indice. The waters condition around the Gerokgak Subdistrict waters was rather polluted, except for the around Sumberkima Village waters. The quality of the waters of Sumberkima Village was better than that of Gerokgak Village and Patas Village waters. Plankton abundance in the waters of Sumberkima Village was slightly low. The highest abundance of plankton in the waters of Patas Village and the lowest in Gerokgak Village waters. The dominant type of plankton was Cyanophyceae (blue-green algae). Keywords: water quality; plankton; species; abundance.

Time Orientation: Past, Present, and Future Perceptions

1989 ◽  
Vol 64 (3_suppl) ◽  
pp. 1199-1205 ◽  
Author(s):  
Leonard A. Jason ◽  
Jennifer Schade ◽  
Louise Furo ◽  
Arne Reichler ◽  
Clifford Brickman
Keyword(s):  
Quality Of Life ◽  
Religious Orientation ◽  
Large Scale ◽  
Time Orientation ◽  
Nuclear War ◽  
Future Expectations ◽  
The Past ◽  
Future Perceptions ◽  
Better Than

A survey was conducted to assess people's time orientation or where they spend most of their thinking time: past, present or future. 100 women were also asked about their expectations for the quality of life in 20 co 30 yr. and about the odds of a large-scale nuclear war within 30 yr. Respondents thought almost twice as much about the present and future as the past. They rated the quality of life in 20 to 30 yr. as being the same as or slightly better than now. A nuclear war within 30 yr. was considered possible; religious orientation had a strong effect. No significant relationship was found between time orientation and future expectations.

scholarly journals Ecological restoration and effect investigation of a river wetland in a semi-arid region, China

2015 ◽  
Vol 368 ◽  
pp. 417-423
Author(s):  
S. Xu ◽  
X. Jiang ◽  
Y. Liu ◽  
Y. Fu ◽  
Q. Zhao
Keyword(s):  
Water Quality ◽  
Economic Value ◽  
Level Control ◽  
Wetland Ecosystems ◽  
Restoration Techniques ◽  
Semi Arid Region ◽  
Ecological Methods ◽  
Regional Water ◽  
Better Than

Abstract. River wetlands are heavily impacted by human intervention. The degradation and loss of river wetlands has made the restoration of river ecosystems a top priority. How to rehabilitate rivers and their services has been a research focus. The main goal of it is to restore the river wetland ecosystems with ecological methods. The Gudong River was selected as a study site in Chaoyang city in this study. Based on the analysis of interference factors in the river wetland degradation, a set of restoration techniques were proposed and designed for regional water level control, including submerged dikes, ecological embankments, revegetation and dredging. The restoration engineering has produced good results in water quality, eco-environment, and landscape. Monthly reports of the Daling River show that the water quality of Gudong River was better than Grade III in April 2013 compared with Grade V in May 2012. The economic benefit after restoration construction is 1.71 million RMB per year, about 1.89 times that before. The ratio of economic value, social value and eco-environmental value is 1:4:23.

Impact of Municipal Wastewater on the Quality of the River Sava

1990 ◽  
Vol 22 (5) ◽  
pp. 275-280
Author(s):  
S. Tedeschi
Keyword(s):  
Water Quality ◽  
Oxygen Saturation ◽  
Municipal Wastewater ◽  
Treatment Process ◽  
Fish Kills ◽  
The Past ◽  
Heavy Pollution ◽  
Zagreb Area ◽  
Pollution Loads

The River Sava is very polluted in certain sections. At times, the dissolved oxygen is completely exhausted (1.0 to 3.0 mg O2/l) resulting in frequent massive fish kills. The water quality has significantly deteriorated during the past few decades, due to the industry developed in the watershed and the increased population in the area. Especially heavy pollution loads come from the greater Zagreb area (153 t BOD5/day). Treating the wastewater from Zagreb could upgrade the water quality of the Sava, and 68 to 72% oxygen saturation could be achieved even under the most unfavourable conditions. Particular attention should be given to the choice of the treatment process, due to the planned construction of multi-purpose reservoirs along the Sava.

scholarly journals Water Quality, Survival, and Growth of Red Tilapia, Oreochromis niloticus Cultured In Aquaponics System

2018 ◽  
Vol 47 ◽  
pp. 02006
Author(s):  
Eri Setiadi ◽  
Yohana R. Widyastuti ◽  
Tri Heru Prihadi
Keyword(s):  
Water Quality ◽  
Survival Rate ◽  
Oreochromis Niloticus ◽  
Quality Parameters ◽  
Leaf Production ◽  
Red Tilapia ◽  
Survival And Growth ◽  
Good Price ◽  
Better Than

Red tilapia, Oreochromis niloticus is the main commodity of freshwater fish in Indonesia. Red tilapia have a good price compared to tilapia. The aims of this experiment to determine of survival, growth, and water quality of red tilapia cultured in aquaponic system. The treatment of this experiment, namely A) Red tilapia cultured without aquaponic (control), B) Red tilapia cultured with pakcoy, and C) Red tilapia cultured with caisin. The result showed that the highest of survival rate, weight, and length absolute found at Red tilapia cultured with pakcoy (96.00±1.73%, 32.31±0.74g, and 7.57±0.21 cm) and Caisin (96.00±1.73%, 32.31±0.74g, and 7.57±0.21 cm) than that of without aquaponic (86.67±1.15%, 25.77±1.05g, and 6.43±0.31 cm) (P<0.05). Vegetable leaf production of pakcoy was 6.57±0.16 Kg and Caisin was 6.17±0.11 Kg. The water quality parameters such as DO, TAN, nitrite, and nitrate of Red tilapia cultured using aquaponics was better than that of without aquaponic.

Assessing the impacts of wastewater treatment implementation on the water quality of a small urban river over the past 40 years

2015 ◽  
Vol 22 (16) ◽  
pp. 12720-12736 ◽  
Author(s):  
Natacha Brion ◽  
Michel A. Verbanck ◽  
Willy Bauwens ◽  
Marc Elskens ◽  
Margaret Chen ◽  
...  
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Urban River ◽  
The Past ◽  
Treatment Implementation

scholarly journals Microcystis Bloom in an Urban Lake after River Water Diversion—A Case Study

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1811
Author(s):  
Xiaoyan Chen ◽  
Dong Bai ◽  
Chunlei Song ◽  
Yiyong Zhou ◽  
Xiuyun Cao
Keyword(s):  
Water Quality ◽  
Algal Blooms ◽  
Water Diversion ◽  
P Deficiency ◽  
Microcystis Bloom ◽  
Han River ◽  
P Limitation ◽  
P Content

To improve the water quality of Lake Yuehu, a water diversion from the Han River was conducted in July 2008. However, an unexpected Microcystis bloom occurred in the lake after water introduction. Water and sediment samples were collected from Lake Yuehu and the variation of chemical and biochemical parameters, as well as the phytoplankton community, were analyzed during the water diversion to assess its effect and to clarify the mechanism leading to the Microcystis bloom. The nitrogen (N) concentration was increased and phosphorus (P) concentration decreased in Lake Yuehu after receiving water from the Han River, which had a high loading of N and a low loading of P. These conditions may benefit the growth and dominance of non-N2 fixing Microcystis, as it may not have suffered from P limitation during our study because it did not produce extracellular phosphatase, which worked as an indicator of P deficiency, as evidenced by the in situ enzyme-labelled fluorescence. Notably, the sediment Fe (OOH)~P content significantly decreased in Lake Yuehu; this pulsed release of P from the sediment might have sustained the Microcystis bloom. Based on our results, algal blooms may occur as a consequence of conducting water diversion projects to improve water quality.

scholarly journals Tingkat dan laju penurunan kualitas air di DAS Brantas Malang Raya

2019 ◽  
Vol 5 (2) ◽  
pp. 185
Author(s):  
Ima Yudha Perwira
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Organic Materials ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Decrease Rate ◽  
Better Than

The decrease level of water quality of Brantas Watershed in Malang Raya was observed in this study. The aim of this study was to observe the decrease level of water quality of Brantas Watershed from Batu to Malang City. This study was carried out in the Brantas Watershed of Malang Raya (8 stations: A, B, C, D, E, F, G, and H) for 18,4 Km. The water quality parameters observed in this study were: CODmn (permanganometry), CODcr (CODmn correlation based analysis), dissolved oxygen (DO) (Winkler iodometry), TDS and electrical conductivity (EC) (EC meter), pH (pH meter), and turbidity (Turbidity meter). The result showed the value of CODmn: 1,8-10,2 mg/L, CODcr: 5,6-31,5 mg/L, DO: 4,0-6,1 mg/L, TDS: 204-289 mg/L, EC: 430-617 µS/cm, pH: 7,1-7,6, and turbidity: 2,02-10,30 NTU. There are 3 stations (A, B, and C) with 1st class water quality, 1 station (D) with the 2nd class water quality, and 4 stations (E, F, G, and H) with 3rd class water quality. The decrease of water quality in the Brantas Watershed from Batu to Malang City was up to 3 times with a decrease rate of 2,3 mg/L-1Km-1. The decomposition of organic materials in the water of Batu City and western part of Malang City is relatively better than that of central parts of Malang City which might be caused by the over capacity of recovery (Self-purification mechanism).

Quality Evaluation of Jajrood River (IRAN) by Quality Indices Methods

2013 ◽  
Vol 650 ◽  
pp. 652-657
Author(s):  
Mohammad Mirzaei ◽  
Hamed Hasanian
Keyword(s):  
Water Quality ◽  
Quality Index ◽  
Quality Indices ◽  
Wet Season ◽  
Management Actions ◽  
Acceptable Quality ◽  
Negative Effect ◽  
Dry Seasons ◽  
Better Than

This Regular evaluation and analysis of river quality helps accurate management to reach acceptable quality. In this study, water quality indices (WQI) method applied to evaluate quality of Jajrood River which is one of the main sources of Tehran drinking water. It helps to subsidize management actions in Jajrood watershed. Sampling carried out for 9 years during 2001-2010 in 10 stations along the river in wet and dry stations to identify water quality and the main source of pollution. Results show water quality in all stations classifies as medium according to National Sanitation Foundation (NSF) and water quality index in wet season is better than the corresponding value in dry seasons. Entrance of pollution during the upstream of Latian Dam (especially in populated centers) has negative effect on the water quality, however river has a good natural attenuation capacity, therefore quality index of river in the main inlet of Latian dam (Lashkarak Bridge) classifies as medium. Collecting wastewater at the populated centers and developing soil conservation and controlling erosion at the upstream of watershed can effectively improve the water quality of river.

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