scholarly journals SOLVING TECHNICAL PROBLEMS THROUGH EQUATIONS

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
DANILA VIERU ◽  
GHEORGHE VOICU ◽  
LAURA TOMA ◽  
PAULA TUDOR
Keyword(s):  
Environmental Factors ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Household Waste ◽  
Mathematical Equation ◽  
Technical Problems ◽  
Waste Gas ◽  
Suspended Particulates ◽  
Waste Storage ◽  
Environmental Permitting

The need for solid household waste (MSW) generated by economic and domestic activities is continuous and should be imposed to protect the health of the population and environmental factors. After sorting the generated waste, „the remaining residue” favours the occurrence of some pollutants, among which we mention suspended particulates, disagreeable odours, greenhouse gases, etc. This waste has to be managed in safe health and environment, no matter where it was generated. Managing them means either storing in statutory environmental protection facilities or incinerating in authorized installations with integrated environmental permitting. Waste storage may be subject to a mathematical equation called the time equation of a landfill. On the basis of such equation, it will be possible to calculate annually the amount of degraded waste gas generating gas (LFG) containing CH<sub>4</sub> and CO<sub>2</sub>. The amount of degraded waste means waste with high dissolved organic carbon (DOC).

scholarly journals SOLVING TECHNICAL PROBLEMS THROUGH EQUATIONS

2018 ◽  
Vol 24 (1) ◽  
pp. 44-49
Author(s):  
DANILA VIERU ◽  
GHEORGHE VOICU ◽  
LAURA TOMA ◽  
PAULA TUDOR
Keyword(s):  
Environmental Factors ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Household Waste ◽  
Mathematical Equation ◽  
Technical Problems ◽  
Waste Gas ◽  
Suspended Particulates ◽  
Waste Storage ◽  
Environmental Permitting

The need for solid household waste (MSW) generated by economic and domestic activities is continuous and should be imposed to protect the health of the population and environmental factors. After sorting the generated waste, „the remaining residue” favours the occurrence of some pollutants, among which we mention suspended particulates, disagreeable odours, greenhouse gases, etc. This waste has to be managed in safe health and environment, no matter where it was generated. Managing them means either storing in statutory environmental protection facilities or incinerating in authorized installations with integrated environmental permitting. Waste storage may be subject to a mathematical equation called the time equation of a landfill. On the basis of such equation, it will be possible to calculate annually the amount of degraded waste gas generating gas (LFG) containing CH4 and CO2. The amount of degraded waste means waste with high dissolved organic carbon (DOC).

scholarly journals Influence of the pH indicator on dissolved organic carbon for determination the hazardousness of industrial waste

2019 ◽  
pp. 200-206
Author(s):  
Georgiana Cernica ◽  
Georgeta Madalina Arama ◽  
Adriana Cuciureanu ◽  
Gina Catrina ◽  
Diana Stroia
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Industrial Waste ◽  
Common Method ◽  
Leaching Test ◽  
Environmental Legislation ◽  
Ph Indicator ◽  
Essential Information ◽  
Waste Storage ◽  
Influence Of Ph

The paper presents the influence of pH on the dissolved organic carbon in industrial waste samples as a decision indicator in determining the hazardousness of the waste at storage according to the environmental legislation. Waste storage is a common method of management and is realizing according to GO 95/2005, which requires limit concentrations of the indicators analyzed according to each type of deposit (inert, non-hazardous, and hazardous). For the analysis of the dissolved organic carbon, 6 samples of waste from different sectors of activity were subjected to the leaching test and the eluate was analyzed on a multi N/C 3100 equipment at both the pH of the waste, itself and between 7.5 and 8 pH units. From the results obtained it is found that the modification of the pH leads to significant variations in the concentration of the dissolved organic carbon, variations which can provide essential information for the subsequent management of the waste.

Relation between Mercury Concentrations in Walleye (Stizostedion vitreum vitreum) and Northern Pike (Esox lucius) in Ontario Lakes and Influence of Environmental Factors

1991 ◽  
Vol 48 (1) ◽  
pp. 132-139 ◽  
Author(s):  
C. D. Wren ◽  
W. A. Scheider ◽  
D. L. Wales ◽  
B. W. Muncaster ◽  
I. M. Gray
Keyword(s):  
Environmental Factors ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Northern Pike ◽  
Esox Lucius ◽  
Stizostedion Vitreum ◽  
Pike Esox Lucius ◽  
The Mean ◽  
Highly Correlated

We examined the relation between mercury levels in walleye (Stizostedion vitreum vitreum) and northern pike (Esox lucius) in Ontario lakes. Walleye and northern pike occurred together in 79 of the 346 study lakes. The length-standardized mercury concentrations in coexisting walleye and northern pike in the 79 lakes were highly correlated (r2 = 0.60). The mean mercury concentrations in walleye and northern pike of standardized length from these lakes were 0.65 and 0.52 μg/g, respectively. Lacustrine characteristics associated with lake dystrophy (dissolved organic carbon and iron) were positively correlated with mercury levels in both species. Variables associated with acidity (pH and alkalinity) and hardness (calcium, conductivity, and magnesium) were negatively correlated with mercury concentrations in northern pike but not walleye.

Environmental factors and dissolved organic carbon content in a Jinchuan peatland

2016 ◽  
Vol 36 (3) ◽  
pp. 160-165 ◽  
Author(s):  
Tingshuang Zhang ◽  
Sixue Shi ◽  
Wen Zhang ◽  
Yi Wu ◽  
Mengshan Yang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Carbon Content ◽  
Organic Carbon Content

CHARACTERISATION OF DISSOLVED ORGANIC CARBON (DOC) LEACHED FROM LEAVES IN WATER

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Markus Heryanto Langsa
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Total Organic Carbon ◽  
Gas Chromatography Mass Spectrometry ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Pinus Radiate

<p>Penelitian ini bertujuan untuk menentukan senyawa organik khususnya organic karbon terlarut (DOC) dari dua spesies daun tumbuhan (<em>wandoo eucalyptus </em>and <em>pinus radiate, conifer</em>) yang larut dalam air selama periode 5 bulan leaching eksperimen. Kecepatan melarutnya senyawa organic ditentukan secara kuantitatif dan kualitatif menggunakan kombinasi dari beberapa teknik diantaranya Total Organic Carbon (TOC) analyser, Ultraviolet-Visible (UV-VIS) spektrokopi dan pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS).</p><p>Hasil analisis DOC dan UV menunjukkan peningkatan yang tajam dari kelarutan senyawa organic di awal periode pengamatan yang selanjutnya berkurang seiring dengan waktu secara eksponensial. Jumlah relatif senyawa organic yang terlarut tergantung pada luas permukaan, aktifitas mikrobiologi dan jenis sampel tumbuhan (segar atau kering) yang digunakan. Fluktuasi profil DOC dan UV<sub>254</sub> disebabkan oleh aktifitas mikrobiologi. Diperoleh bahwa daun kering lebih mudah terdegradasi menghasilkan senyawa organic dalam air dibandingkan dengan daun segar. Hasil pyrolysis secara umum menunjukkan bahwa senyawa hidrokarbon aromatic dan fenol (dan turunannya) lebih banyak ditemukan pada residue sampel setelah proses leaching kemungkinan karena adanya senyawa lignin atau aktifitas humifikasi mikrobiologi membuktikan bahwa senyawa-senyawa tersebut merupakan komponen penting dalam proses karakterisasi DOC.</p>

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