Some effects of the 1982-83 drought on water quality and macroinvertebrate fauna in the lower La Trobe River, Victoria

1987 ◽  
Vol 38 (2) ◽  
pp. 289 ◽  
Author(s):  
BC Chessman ◽  
DP Robinson
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Dissolved Oxygen Concentration ◽  
Taxonomic Richness ◽  
Aquatic Macroinvertebrate ◽  
Causative Factors ◽  
Prolonged Drought ◽  
Before And After ◽  
Macroinvertebrate Fauna

Following severe and prolonged drought, flows in parts of the lower LaTrobe River reached record lows in February 1983. Consequent lack of dilution for wastewater discharges resulted in marked deterioration of water quality, with dissolved oxygen concentration dropping to 2 g m-3 and electrical conductivity rising to 115 mS m-1. Despite these changes there was little alteration in the taxonomic richness or composition of the aquatic macroinvertebrate fauna. Faunal richness in the river downstream from Yallourn was low both before and after the drought, but the causative factors remain obscure.

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).

scholarly journals Adaptive Water Sampling Device for Aerial Robots

Drones ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 5 ◽  
Author(s):  
Cengiz Koparan ◽  
A. Bulent Koc ◽  
Charles V. Privette ◽  
Calvin B. Sawyer
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Dissolved Oxygen ◽  
Water Samples ◽  
Sensor Node ◽  
Activation Mechanism ◽  
Water Sampling ◽  
Sampling Device ◽  
Sampling Locations

Water quality monitoring and predicting the changes in water characteristics require the collection of water samples in a timely manner. Water sample collection based on in situ measurable water quality indicators can increase the efficiency and precision of data collection while reducing the cost of laboratory analyses. The objective of this research was to develop an adaptive water sampling device for an aerial robot and demonstrate the accuracy of its functions in laboratory and field conditions. The prototype device consisted of a sensor node with dissolved oxygen, pH, electrical conductivity, temperature, turbidity, and depth sensors, a microcontroller, and a sampler with three cartridges. Activation of water capturing cartridges was based on in situ measurements from the sensor node. The activation mechanism of the prototype device was tested with standard solutions in the laboratory and with autonomous water sampling flights over the 11-ha section of a lake. A total of seven sampling locations were selected based on a grid system. Each cartridge collected 130 mL of water samples at a 3.5 m depth. Mean water quality parameters were measured as 8.47 mg/L of dissolved oxygen, pH of 5.34, 7 µS/cm of electrical conductivity, temperature of 18 °C, and 37 Formazin Nephelometric Unit (FNU) of turbidity. The dissolved oxygen was within allowable limits that were pre-set in the self-activation computer program while the pH, electrical conductivity, and temperature were outside of allowable limits that were specified by Environmental Protection Agency (EPA). Therefore, the activation mechanism of the device was triggered and water samples were collected from all the sampling locations successfully. The adaptive water sampling with Unmanned Aerial Vehicle-assisted water sampling device was proved to be a successful method for water quality evaluation.

scholarly journals KOEFISIEN TRANSFER GAS (KLa ) PADA PROSES AERASI MENGGUNAKAN TRAY AERATOR BERTINGKAT 5 (LIMA)

Jurnal Dampak ◽  
2012 ◽  
Vol 9 (2) ◽  
pp. 132 ◽  
Author(s):  
Suarni Saidi Abuzar
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
Dissolved Oxygen ◽  
Transfer Coefficient ◽  
Oxygen Concentration ◽  
Gas Transfer ◽  
Dissolved Oxygen Concentration ◽  
Total Height ◽  
Water And Wastewater ◽  
Gas Transfer Coefficient

ABSTRAKAerasi merupakan salah satu metode yang dapat digunakan untuk menyisihkan kandungan logam dalam air, baik air tanah, air permukaan, maupun air limbah. Salah satu jenis aerator dalam proses aerasi adalah tray aerator. Untuk menganalisis nilai koefisien transfer gas (KLa) pada proses aerasi khususnya tray aerator bertingkat 5 (lima)dengan jarak antar tray 25 cm dan tinggi total 125 cm, perlu dilakukan penelitian dengan tujuan untuk memperoleh nilai KLa. Air dialirkan ke dalam tray aerator bertingkat 5 (lima) dan diukur kandungan Disolved Oxygen (DO) dengan metode water quality checker. Hasil penelitian menunjukan terjadi peningkatan konsentrasi oksigen pada sampel setelah dilakukan aerasi dengan tray aerator bertingkat 5 (lima) dari 5,97 mg/L menjadi 6,34 mg/L dengan nilai koefisien transfer gas (KLa) sebesar 0,045/menit.Kata kunci: Tray Aerator bertingkat 5, Aerasi, Koefisien trasnsfer gas (KLa)ABSTRACTAeration method is one method for removing metalfrom water including groundwater, surface water and wastewater. One of known aerator is method is tray aerator. For analizing gas transfer coefficient (KLa) in aeration method especially in five storey tray aerator with the distance between each aerator was 25 cm and total height was 125 cm. water was discharged in five storey tray aerator and was measured the dissolved oxygen concentration by using water quality checker method. Result showed the increase of oxygen concentration in sample after being aerated in five storey tray aerator, from 5.97 mg/L to 6.34 mg/L with gas transfer coefficient (KLa) 0.045/min. Keywords: Aeration, Five story aerator, Gas transfer coefficient (KLa)

scholarly journals PENGAMATAN KUALITAS AIR UNTUK MENDUKUNG PERIKANAN DI WADUK CIRATA, JAWA BARAT

2017 ◽  
Vol 14 (2) ◽  
pp. 173 ◽  
Author(s):  
Sri Endah Purnamaningtyas ◽  
Didi Wahju Hendro Tjahjo
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Sea Level ◽  
Water Samples ◽  
Bottom Water ◽  
Water Environment ◽  
Phosphate Concentration ◽  
Dissolved Oxygen Concentration ◽  
Territorial Water

Pengamatan kualitas air di Waduk Cirata (luas: 6.200 ha, rata-rata kedalaman (z):34,9 m, dan ketinggian 225 m dpl) dilakukan mulai bulan Maret sampai dengan Desember 2006. Penelitian ini bertujuan untuk mengetahui kondisi lingkungan perairan Waduk Cirata dalam mendukung kegiatan perikanan. Penelitian dilakukan dengan metode survei dan pengambilan contoh air menggunakan kemmerer bottle sampler” Pengambilan contoh air dilakukan di 6 stasiun pengamatan dengan kedalaman 0,5; 2; 4,5; dan 8 m serta dasar perairan. Dari hasil pengamatan yang di peroleh selama penelitian menunjukkan bahwa kualitas air diWaduk Cirata cukup mendukung untuk kegiatan perikanan tangkap, seperti suhu berkisar antara 27,1 - 31,5°C, pH 6,5 - 8,5, O2 terlarut 0,44 - 4,72 mg per L, CO2 0 - 11,48 mg per L, N-NO2 0 - 0,259 mg per L, N-NO3 0,054 - 9,841 mg per L, NH4 0,0171 - 3,351 mg per L, NH3 0 - 3,17 mg per L, PO4 0,024 - 7,154 mg per L, dan total bahan organik 0 - 27,2 mg per L. Berdasarkan pada hasil dari analisis konsentrasi oksigen terlarut telah mengalami stratifikasi, dan klasifikasi tingkat kesuburan perairan berdasarkan pada konsentrasi fosfat, perairan ini sudah mencapai tingkat eutrofik dan hipereutrofik. Hal tersebut, berarti usaha pengembangan budi daya ikan dalam karamba jaring apung telah melebihi daya dukung perairan dan cenderung telah mencemari perairan. Observation of water quality was done in Cirata Reservoir (area: 6,200 ha, dept mean (z):34.9 m, and altitude 225 m above sea level) from March to December 2006. This research aimed to know the condition of water environment of Cirata Reservoir to support fisheries activities. The research was done using method of survey. Water samples was collected using kemmerer bottle sampler in 6 station sites at a depth of 0.5; 2; 4.5; 8 m and bottom water, respectively. The result indicated that the water quality of Cirata Reservoir was good enough for supporting t fisheries activities, namely water temperature 27.1 - 31.5°C, pH 6.5 to 8.5, DO 0.44- 4.72 mg per L, free CO2 0 - 11.48 mg per L, N-NO2 0 - 0.259 mg per L, N-NO3 0.054 - 9.841 mg per L, NH4: 0.0171 - 3.351 mg per L, NH3 0 - 3.17 mg per L, PO4 0.024 - 7.154 mg per L, organics materials 0 - 27.2 mg per L. Dissolved oxygen concentration stratification was observed, and classification mount fertility of territorial water of its phosphate concentration, this territorial water have reached storey; level of eutrofik and hipereutrofik. The mentioned mean the effort development of fish conducting in net keramba float have exceeded energy support territorial water and tend to have contaminated territorial water.

scholarly journals ALTERACIONES FISICO-QUIMICAS DE LA COLUMNA DE AGUA, GENERADAS POR EL USO DEL BOLICHE (METODO DE PESCA ARTESANAL) EN LA CIENAGA GRANDE DE SANTA MARTA, CARIBE COLOMBIANO

2016 ◽  
Vol 24 ◽  
Author(s):  
Mario Enrique Rueda ◽  
José Ernesto Mancera P.
Keyword(s):  
Dissolved Oxygen ◽  
Water Column ◽  
Oxygen Concentration ◽  
Coastal Lagoon ◽  
Water Transparency ◽  
Dissolved Oxygen Concentration ◽  
Artisanal Fishing ◽  
Physical Chemical ◽  
Before And After ◽  
The Impact

With the purpose of assessing the impact generated by the use of an artisanal fishing method populary called "boliche", in the tropical coastal lagoon Ciénaga Grande de Santa Marta, different aspects were quantified; being one of them designed to analyze some physical-chemical alterations of the water column, produced during the fishing operations. The dissolved oxygen concentration, water transparency and seston composition and concentration, before and after of 70 boliche's thrusts were determinated. The results showthat fishing operations generate some momentary changes of little repercution to the ecosystem, such as particle resuspention principally inorganic an increase in seston concentration and a consequen water column transparency decrease. The dissolved oxygen concentration does not show appreciable alteration.

scholarly journals Korelasi Antara Konsentrasi Oksigen Terlarut Pada Kepadatan Yang Berbeda Dengan Skoring Warna Daphnia spp. [Correlation Between Dissolved Oxygen Concentration In Different Densities With Color Scoring Of Daphnia spp.]

2019 ◽  
Vol 2 (1) ◽  
pp. 45 ◽  
Author(s):  
A. Shofy Mubarak, Diah Ayu Satyari U, Rahayu Kusdarwati
Keyword(s):  
Water Quality ◽  
Population Density ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Slow Growth ◽  
Dissolved Oxygen Concentration ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
The Difference ◽  
Treatment Medium

Abstract Dissolved oxygen is the parameters key of water quality. Low level of dissolved oxygen can affect the function and slow growth, can even cause death to fish in hypoxia condition. The aims of this experiment were to determine the effect of population density of Daphnia spp. of dissolved oxygen concentration and the correlation between dissolved oxygen concentration with color scoring of Daphnia spp. This method was experimental with Completely Randomized Design as experiment design with 6 treatments and 4 replications. The treatment that was given were the differences of Daphnia spp. density that consisted of treatment A (50 individu/200 ml), treatment B (250 individu/200 ml), treatment C (450 individu/200 ml), treatment D (650 individu/200 ml), treatment E (850 individu/200 ml), and treatment F (1050 individu/200 ml). The results showed that the difference of Daphnia spp. density showed highly significant effect of dissolved oxygen concentration of treatment medium (p<0,01). In addition, this experiment also showed that the dissolved oxygen concentration in treatment medium showed negative correlation with color score of Daphnia spp.

scholarly journals Monitoring Dissolved Oxygen Concentration (DOC) in Prawn Aquiculture Water Environment Based on Biological Behavior Characteristics

2011 ◽  
Vol 1 ◽  
pp. 86-91
Author(s):  
Hai Qing Yang ◽  
Jing Bo Cai ◽  
Guo Quan Zeng ◽  
Hong Xi Wu
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Great Influence ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Water Salinity ◽  
Biological Behavior ◽  
Dissolved Oxygen Concentration ◽  
Water Container

Biological early warning system using physiological and behavioral responses of living organisms to water quality has been given much attention during past years. This study applied a digital video recording system to monitor prawn behavior under different water quality parameters. Three groups of prawn were used for calibration set while one group was for the validation of calibration results. A special water container was built for this experiment. The targeted water quality parameters, e.g. water salinity, pH and dissolved oxygen concentration (DOC), were adjusted by adding different chemicals in the water container. The calibration result shows that water salinity and pH have no significant impact on prawn behavior while changing DOC in water makes great influence on moving speed of prawns. When DOC is above 3.0 mg/l, prawns move about 80 pixels/s; when DOC is between 2.6 and 1.74 mg/l, prawns move at 120 pixels/s; and when DOC is below 1.2 mg/l, prawns move up to 1000-1200 pixels/s. The validation set of prawns under changing DOC from 1.82 to 0.54 mg/l confirms the calibration results. This proposed method is worthy of being further investigated for practically monitoring aquiculture environment.

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