scholarly journals BIOLOGICAL OXIDATION AND EMISSION OF DISSOLVED METHANE IN DHS REACTOR POLISHING UP ANAEROBICALLY TREATED WASTEWATER

2010 ◽  
Vol 66 (3) ◽  
pp. 111-119
Author(s):  
Norihisa MATSUURA ◽  
Taku EGUCHI ◽  
Masashi HATAMOTO ◽  
Hideki HARADA ◽  
Akiyoshi OHASHI
Keyword(s):  
Treated Wastewater ◽  
Biological Oxidation ◽  
Dissolved Methane

Recovery and biological oxidation of dissolved methane in effluent from UASB treatment of municipal sewage using a two-stage closed downflow hanging sponge system

2015 ◽  
Vol 151 ◽  
pp. 200-209 ◽  
Author(s):  
Norihisa Matsuura ◽  
Masashi Hatamoto ◽  
Haruhiko Sumino ◽  
Kazuaki Syutsubo ◽  
Takashi Yamaguchi ◽  
...  
Keyword(s):  
Municipal Sewage ◽  
Biological Oxidation ◽  
Two Stage ◽  
Dissolved Methane

A Combined Chemical Reduction and Biological Oxidation Process for the Treatment of Textile Wastewater

2001 ◽  
Vol 36 (3) ◽  
pp. 605-617 ◽  
Author(s):  
Mohammad R. Haghighi Podeh ◽  
Mitra Sarhadi ◽  
Seyyed M. Ghoreishi
Keyword(s):  
Sodium Borohydride ◽  
Biological Treatment ◽  
Chemical Reduction ◽  
Textile Wastewater ◽  
Treatment System ◽  
Treated Wastewater ◽  
Experimental Comparison ◽  
Treatment Technique ◽  
Biological Oxidation ◽  
Sodium Borohydride Reduction

Abstract We report on the effectiveness of a combined reduction-biological treatment system for the decolourization of non-biodegradable textile dyeing wastewater. In this treatment system a bisulfite-catalyzed sodium borohydride reduction followed by activated sludge technique was used in order to remove the colours at ambient temperature and pressure. This experimental investigation consisted of two major parts: reduction treatment and biological oxidation. Both synthetic and actual wastewaters were used in this research. Synthetic wastewaters were made by several groups of dyes such as direct, basic and reactive colours. Actual wastewaters were collected from two different textile industries in the city of Isfahan, Iran. The characterization of raw and treated wastewater was carried out by infrared and ultraviolet spectrometers. The ASTM-E450-82 method was used to measure the colour. The results of this study demonstrated that this biological treatment technique decreased colour, BOD, COD and TSS by 74 to 88%, 97 to 100%, 76 to 83% and 92 to 97%, respectively. The IR and UV analyses showed that nonbiodegradable dyes are converted to biodegradable organic compounds such as alkyl and alkens. Another major advantage of this method with respect to other methods, namely, adsorption and coagulation, was that it removes colour without causing any disposal problem. The optimum dosage for treatment of actual wastewaters was found to be 50 to 60 mg/L for catalyst bisulfite and 200 to 250 mg/L for sodium borohydride. Finally, a benchscale experimental comparison of this technique with other combined chemical and biological methods currently used showed higher efficiency and lower cost for the newly developed technique.

Biodegradability enhancement of a pesticide-containing bio-treated wastewater using a solar photo-Fenton treatment step followed by a biological oxidation process

2012 ◽  
Vol 46 (15) ◽  
pp. 4599-4613 ◽  
Author(s):  
Vítor J.P. Vilar ◽  
Francisca C. Moreira ◽  
Ana C.C. Ferreira ◽  
M.A. Sousa ◽  
C. Gonçalves ◽  
...  
Keyword(s):  
Oxidation Process ◽  
Treated Wastewater ◽  
Biological Oxidation ◽  
Treatment Step

Biological oxidation of dissolved methane in effluents from anaerobic reactors using a down-flow hanging sponge reactor

2010 ◽  
Vol 44 (5) ◽  
pp. 1409-1418 ◽  
Author(s):  
Masashi Hatamoto ◽  
Hiroki Yamamoto ◽  
Tomonori Kindaichi ◽  
Noriatsu Ozaki ◽  
Akiyoshi Ohashi
Keyword(s):  
Biological Oxidation ◽  
Dissolved Methane ◽  
Anaerobic Reactors

DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

2010 ◽  
Vol 13 (3) ◽  
pp. 92-102
Author(s):  
Trung Duc Le
Keyword(s):  
Ethanol Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Treatment Processes ◽  
Physico Chemical ◽  
Biological Methods ◽  
Treatment Step ◽  
Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

DISTRIBUTION OF DISSOLVED METHANE IN SURFACE COASTAL WATERS OF THE NORTHEASTERN PART OF THE BLACK SEA

2017 ◽  
Author(s):  
Elena Kovaleva ◽  
Elena Kovaleva ◽  
Alexander Izhitskiy ◽  
Alexander Izhitskiy ◽  
Alexander Egorov ◽  
...  
Keyword(s):  
Black Sea ◽  
Natural Waters ◽  
Sea Water ◽  
The Black Sea ◽  
Methane Formation ◽  
Anthropogenic Pressure ◽  
Russian Science ◽  
Southeastern Part ◽  
Dissolved Methane ◽  
Continental Runoff

Studying of methane formation and distribution in natural waters is important for understanding of biogeochemical processes of carbon cycle, searching for oil and gas sections and evaluation of CH4 emissions for investigations of greenhouse effect. The Black Sea is the largest methane water body on our planet. However, relatively low values of methane concentration (closed to equilibrium with the atmospheric air) are typical of the upper aerobic layer. At the same time, the distribution pattern of CH4 in surface waters of coastal areas is complicated by the influence of coastal biological productivity, continental runoff, bottom sources, hydrodynamic processes and anthropogenic effect. The investigation is focused on the spatial variability of dissolved methane in the surface layer of the sea in coastal regions affected by the continental runoff and anthropogenic pressure. Unique in situ data on methane concentrations were collected along the ship track on 2 sections between Sochi and Gelendzhik (2013, 2014) and 2 sections between Gelendzhik and Feodosia (2015). Overall 170 samples were obtained. Gas-chromatographic analysis of the samples revealed increase of CH4 saturation in the southeastern part of the Crimean shelf and the Kerch Strait area. Such a pattern was apparently caused by the influence of the Azov Sea water spread westward along the Crimean shore from the strait. This work was supported by the Russian Science Foundation, Project 14-50-00095 and the Russian Foundation for Basic Research, Project 16-35-00156 mol_a.

Influx of streaming methane into anoxic waters of the Black Sea basin

2019 ◽  
Vol 59 (6) ◽  
pp. 952-963
Author(s):  
Yu. G. Artemov ◽  
V. N. Egorov ◽  
S. B. Gulin
Keyword(s):  
Spatial Distribution ◽  
Black Sea ◽  
The Black Sea ◽  
Gas Bubble ◽  
Dissolved Methane ◽  
Anoxic Waters ◽  
Deep Waters ◽  
Methane Budget

Based on data on the spatial distribution and fluxes of streaming (bubbling) methane within the Black Sea, the rate of dissolved methane inflow to Black Sea deep waters was assessed. Calculations showed that gas bubble streams annually replenish the methane budget in the Black Sea by 1.2 109 m3, or 0.9 Tg, which is considerably less than determined by known biogeochemical estimates of components of methane balance in the Black Sea.

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