ÉTUDE D'UNE POPULATION DE BACTÉRIES RÉDUCTRICES DU SOUFRE

1960 ◽  
Vol 6 (3) ◽  
pp. 349-354 ◽  
Author(s):  
R. Desrochers ◽  
V. Fredette
Keyword(s):  
Dissolved Oxygen ◽  
Hydrogen Sulphide ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Natural Conditions ◽  
Reducing Bacteria

A study has been made of the populations of sulphur-reducing bacteria in a certain section of the Ottawa river.Not only have the numbers of these populations been determined over a 10-mile section, but also several factors such as dissolved oxygen and biochemical oxygen demand have been examined for their relation with the variations in number of these same populations.The yield of sulphate-waste liquors in numbers of population supported as well as the amount of hydrogen sulphide produced under natural conditions have also been studied.

scholarly journals Simple quality control technique to identify dissolved oxygen diffusion issues with biochemical oxygen demand bottle incubations

2017 ◽  
Author(s):  
Johnathan Daniel Maxey ◽  
Neil David Hartstein ◽  
Dorathy Penjinus ◽  
Alan Kerroux
Keyword(s):  
Dissolved Oxygen ◽  
Water Column ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Freshwater Ecosystems ◽  
Control Technique ◽  
Community Respiration ◽  
Parallel Diffusion ◽  
Quality Control Technique

Stratified estuaries are home to expanding aquaculture activities whose ecological footprints can be observed through trends in microbial community respiration in the water column. Bottle incubations are widely used to measure water column community respiration in marine and freshwater ecosystems by measuring the flux of dissolved oxygen occurring in the bottle over a period of time. When in situ dissolved oxygen (DO) concentrations are markedly different than DO concentration of the incubation medium the potential for diffusion of oxygen across the bottle opening is great and may be especially pronounced in strongly stratified systems with relatively low rates of pelagic oxygen consumption. We incubated 60 Biochemical Oxygen Demand (BOD) bottles filled with sterilized water with DO concentrations ranging from 2.51 mg O2 L-1 to 10.03 mg O2 L-1 for 24 hours in a temperature controlled water bath. There was a significant relationship when DO flux was set as a function of initial DO (DO Flux = -0.0017x + 0.0085, r2 = 0.72, p < 2.2 e-16). DO fluxes ranged from -0.012 mg O2 L-1 hour-1 to 0.005 mg O2 L-1 hour-1 for bottles incubated with initial DO ranging from 10.03 mg O2 L-1 to 3.31 mg O2 L-1, respectively. These results suggest that diffusion across the ground glass seal of BOD bottles is possible and that extra precaution through parallel diffusion controls should be considered when measuring pelagic respiration using BOD bottle incubations in systems with relatively low or relatively high in situ DO concentrations.

scholarly journals Assessment of the Water Quality Characteristics of Kaduna River Receiving Wastewater Discharges

2019 ◽  
Vol 3 (1) ◽  
pp. 56-61
Author(s):  
H. Garba ◽  
C. A. Elanu
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Quality Characteristics ◽  
Chemical Characteristics ◽  
Mean Concentration ◽  
Concentration Levels

An assessment of the chemical characteristics of industrial and domestic wastewater discharges on seven parameters into Kaduna River on a bimonthly basis was carried out. PH, dissolved oxygen (DO), chloride, nitrite, chemical oxygen demand (COD), biochemical oxygen demand (BOD) and iron were analyzed to determine their concentration levels. From the analysis, the highest mean concentration of the parameters were 8.24 of pH, 7.7 mg/l of DO, 233.4 mg/l of chloride, 55.68 mg/l of COD, 27.95 mg/l of nitrite, 122.22 mg/l of BOD, and 17.05 mg/l of iron. After comparing with prescribed standards, it can be concluded that there is evidence of organic and inorganic accumulation of contaminants into River Kaduna.

scholarly journals Biotope Determinants of EPT Assamblages Structure – Târnava Watershed (Transylvania, Romania) Case Study

2015 ◽  
Vol 17 (2) ◽  
pp. 95-104
Author(s):  
Angela Curtean-Bănăduc
Keyword(s):  
Dissolved Oxygen ◽  
Total Nitrogen ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Total Hardness ◽  
Factors Affecting ◽  
Average Flow ◽  
Heterogeneous Structures ◽  
High Diversity

Abstract This study aims to analyze the biotopic factors affecting the EPT assemblage diversity in the rivers of the Târnava Watershed. Our research revealed that the high diversity of the Plecoptera communities is associated with river reaches with boulder and cobble lithological substrate, accentuated slope and natural bank dynamics, and also it is directly correlated with dissolved oxygen and inversely correlated with chemical and biochemical oxygen demand, total hardness, nitrates and total nitrogen in the water. The high diversity of the Trichoptera communities is associated with water which presents moderate quantities of nutrients (total phosphorus, phosphates) and with river reaches with heterogeneous structures (where runs and bends were present). The diversity of the Ephemeroptera communities is positively correlated with the multiannual average flow and riverbed width.

scholarly journals Evaluasi Kualitas Air Situ Parigi, Kota Tangerang Selatan, Provinsi Banten

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
A Zharifa ◽  
M F Fachrul ◽  
D I Hendrawan
Keyword(s):  
Dissolved Oxygen ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Total Suspended Solid ◽  
Suspended Solid ◽  
Grab Sampling ◽  
E Coli

<p>Situ Parigi adalah salah satu situ di Kota Tangerang Selatan yang berada di Kelurahan Parigi Lama, Kecamatan Pondok Aren dengan luas sebesar 4 hektar. Situ Parigi memiliki fungsi sebagai reservoir, pengendali banjir dan irigasi. Kondisi Situ Parigi saat ini belum mendapat perhatian dan dirawat dengan baik. Hal ini terlihat dari banyaknya sampah di saluran inlet dan di bagian tepinya. Penelitian ini bertujuan untuk mengevaluasi kualitas air dan status mutu Situ Parigi. Pengambilan sampel air dilakukan sebanyak 3 (tiga) kali pada Bulan Mei, Juni dan Juli 2018 dengan metode grab sampling. Hasil analisis kualitas air dibandingkan dengan baku-mutu pada PP No. 82 Tahun 2001 untuk kelas 2. Menentukan status mutu air dengan menggunakan metodeIKA-NSF. Parameter yang diukur ada 9 (sembilan) yaitu suhu, Total Suspended Solid (TSS), kekeruhan, pH, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), nitrat, fosfat dan E. coli. Hasil analisis kualitas air menunjukkan parameter fosfat, BODdan E. coli melebihi baku-mutu, sedangkan parameter DO di bawah baku-mutu. Konsentrasi fosfat berkisar 0,04-0,46 mg/l sedangkan baku mutu bernilai 0,2 mg/l. Konsentrasi BOD berkisar 3,08-51,08 mg/l sedangkan baku mutu bernilai 3 mg/l. NilaiE. coli berkisar 0-4.000 CFU/100 ml sedangkan baku mutu bernilai 1.000 CFU/100 ml. Konsentrasi DO berkisar 1,1-4,7 mg/l sedangkan baku mutu bernilai ≥4 mg/l. Status mutu air Situ Parigi bernilai 60,9 yang menunjukkan bahwa Situ Parigi tercemar sedang.<br />Kata kunci: Situ, Parameter, Kualitas Air, Status Mutu Air, IKA-NSF</p>

Quality Issues Regarding the Watercourses from Middle Basin of Jiu River

2017 ◽  
Vol 68 (1) ◽  
pp. 72-76
Author(s):  
Daniela Cirtina ◽  
Camelia Capatina
Keyword(s):  
Dissolved Oxygen ◽  
River Basin ◽  
Total Phosphorus ◽  
Surface Waters ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Chloride Content ◽  
Quality Issues

The study aims to characterize the quality of surface waters in the middle of the river basin Jiu by monitoring physicochemical indicators of their quality, in 2013-2015. In this regard, the pH, dissolved oxygen (DO), biochemical oxygen demand (BOD5) of nitrate (NO3-), nitrite (NO2-), ammonium (NH4+), total phosphorus (Ptotal), chlorides and sulphates from water have been determined. Water of Jiu River and its tributaries of Gorj county have been monitored on representative sections for the evolution of their quality. It was found that the water from natural reservoirs monitored shows an evolution in the limits permitted by the regulations in force except biochemical oxygen demand and nitrites indicators for river Jiu and Tismana and nitrate and chloride content for Gilort River.

Dissolved Oxygen Balance Model for Neris

2001 ◽  
Vol 6 (1) ◽  
pp. 105-131 ◽  
Author(s):  
Gaudenta
Keyword(s):  
Time Series ◽  
Time Series Analysis ◽  
Dissolved Oxygen ◽  
Biochemical Oxygen Demand ◽  
Oxygen Demand ◽  
Point Sources ◽  
Balance Model ◽  
Oxygen Balance ◽  
Source Data

We consider a dissolved oxygen balance model for Neris, which includes biochemical oxygen demand, nitrification, sedimentation, algae respiration and photosynthesis. The load from point sources, tributaries and distributed sources are taken into account. Long-term systematic components such as drift and seasonal components are analysed by applying time series analysis. The model is adapted according to the State Environmental Monitoring, and source data of controlled pollution covering the period 1978-1998.

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