scholarly journals Seasonal variations in concentration and lability of dissolved organic carbon in Tokyo Bay

2015 ◽  
Vol 12 (1) ◽  
pp. 269-279 ◽  
Author(s):  
A. Kubo ◽  
M. Yamamoto-Kawai ◽  
J. Kanda
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
River Water ◽  
Seasonal Variations ◽  
Relative Concentration ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Tokyo Bay ◽  
Chl A

Abstract. Concentrations of recalcitrant and bioavailable dissolved organic carbon (DOC) and their seasonal variations were investigated at three stations in Tokyo Bay, Japan, and in two freshwater sources flowing into the bay. On average, recalcitrant DOC (RDOC), as a remnant of DOC after 150 days of bottle incubation, accounted for 78% of the total DOC in Shibaura sewage treatment plant (STP) effluent, 67% in the upper Arakawa River water, 66% in the lower Arakawa River water, and 78% in surface bay water. Bioavailable DOC (BDOC) concentrations, defined as DOC minus RDOC, were lower than RDOC at all stations. In freshwater environments, RDOC concentrations were almost constant throughout the year. In the bay, RDOC was higher during spring and summer than in autumn and winter because of freshwater input and biological production. The relative concentration of RDOC in the bay derived from phytoplankton, terrestrial, and open-oceanic waters was estimated to be 8–10, 21–32, and 59–69%, respectively, based on multiple regression analysis of RDOC, salinity, and chl a. In addition, comparison with previous data from 1972 revealed that concentrations of RDOC and BDOC have decreased by 33 and 74% at freshwater sites and 39 and 76% in Tokyo Bay, while the ratio of RDOC to DOC has increased. The change in DOC concentration and composition was probably due to increased amounts of STP effluent entering the system. Tokyo Bay exported mostly RDOC to the open ocean because of the remineralization of BDOC.

scholarly journals Seasonal variations in concentration and composition of dissolved organic carbon in Tokyo Bay

2014 ◽  
Vol 11 (7) ◽  
pp. 10203-10228 ◽  
Author(s):  
A. Kubo ◽  
M. Yamamoto-Kawai ◽  
J. Kanda
Keyword(s):  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
River Water ◽  
Seasonal Variations ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Open Ocean ◽  
Tokyo Bay ◽  
Chl A

Abstract. Concentrations of recalcitrant and bioavailable dissolved organic carbon (DOC) and their seasonal variations were investigated at three stations in Tokyo Bay, Japan, and in two freshwater sources flowing into the bay to evaluate the significance of DOC degradation for the carbon budget in coastal waters and carbon export to the open ocean. Recalcitrant DOC (RDOC) was differentiated from bioavailable DOC (BDOC) as a remnant of DOC after 150 days of bottle incubation. On average, RDOC accounted for 78% of the total DOC in Shibaura sewage treatment plant (STP) effluent, 67% in the upper Arakawa River water, 66% in the lower Arakawa River water, and 78% in surface bay water. RDOC concentrations were higher than BDOC at all stations. In freshwater environments, RDOC concentrations were almost constant throughout the year. In the bay, RDOC was higher during spring and summer than during autumn and winter. The relative abundance of RDOC in the bay derived from phytoplankton, terrestrial, and open oceanic waters was estimated to be 9%, 33%, and 58%, respectively, by multiple regression analysis of RDOC, salinity, and chl a. In addition, comparison with previous data from 1972 revealed that concentrations of RDOC and BDOC have decreased by 33% and 74% at freshwater sites and 39% and 76% at Tokyo Bay, while the ratio of RDOC to DOC has increased. The change in DOC concentration and composition was probably due to increased amounts of sewage treatment plant effluent entering the system. Tokyo Bay exported DOC, mostly RDOC, to the open ocean because of remineralization of BDOC.

scholarly journals An Approach towards Minimizing Sewage Inflow in Kelo River across Raigarh City

2021 ◽  
Vol 9 (VII) ◽  
pp. 2149-2153
Author(s):  
Ashish Pradhan
Keyword(s):  
River Water ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
The State ◽  
Industrial City ◽  
Treatment Technologies ◽  
Basic Need ◽  
The City

Raigarh is a rapidly growing industrial city situated in the state of Chhattisgarh, spread over an area of 46.54 km2. It is characterized by its rising population, mounting urbanization, and motorization. The population, of the city, is 1,66,460 as per the census year 2011 and it will be increased by 2,90,988 till the year 2035. There will be an increase not only economically but also there will be a rise in population along with infrastructure works so there is a basic need at the construction of a sewage treatment plant with a view of sufficient capacity to treat the sewage. The objectives of this study are to review and evaluate sewage treatment technologies and propose a sewage treatment plant to improve Kelo River water.

Metamorphization of Bottom Sediments under Uncontrolled Discharge of Waste Waters into the Litoral Zone of the Herakleisky Peninsula (Crimea)

2021 ◽  
Author(s):  
N. A. Orekhova ◽  
◽  
E. I. Ovsyany ◽  
Keyword(s):  
Organic Carbon ◽  
Bottom Sediments ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
The Black Sea ◽  
Carbonate Content ◽  
Total Species Richness

Based on the data of field research performed in 2015, the authors studied characteristics of bottom sediments in the area of a deepwater sewage collector of “Yuzhnye” Integrated Sewage Treatment Plant and transformation of bottom sediments resulted from a longterm anthropogenic impact. The data were obtained by standard methods of geochemical analysis. It is established that the bottom sediments in the wastewater discharge area of “Yuzhnye” Integrated Sewage Treatment Plant are represented by rudaceous and coarsegrained fractions. These are mineral particles formed both as a result of coastal abrasion and in the process of accumulation and diagenesis (shell rock, detrital sand) of bottom sediments. In terms of their size distribution and chemical composition they differed significantly from the sediments formed under natural conditions. These were mostly unconsolidated water-saturated sediments with low carbonate content, high organic carbon and moisture content and signs (impurities, consistency, odour) characteristic of municipal sewage sludge. It is noted that the accumulation level of anthropogenic organic carbon is comparable to that of organic matter in the bottom sediments of Sevastopol region bays characterized by limited water exchange and subject to long-term anthropogenic pollution. Exceeding the previously established critical organic carbon levels in the soft soils of the Black Sea (Corg ≥ 2.5 %) results in destructive changes in ecosystems: it has a negative impact on benthos sharply changing its structural characteristics (abundance, biomass, total species richness) with restructuring of its dominant species structure.

Listeria species incidence and characterisation in a river receiving town sewage from a sewage treatment plant

1997 ◽  
Vol 35 (11-12) ◽  
pp. 201-204 ◽  
Author(s):  
M. P. Combarro ◽  
M. González ◽  
M. Araujo ◽  
A. C. Amezaga ◽  
R. A. Sueiro ◽  
...  
Keyword(s):  
River Water ◽  
Antimicrobial Agents ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Average Efficiency ◽  
Listeria Species ◽  
Species Incidence

This study evaluated the ability of a sewage treatment plant to eliminate Listeria species and the incidence of Listeria species in the river receiving the effluent. The average efficiency of removal of Listeria species in the treatment plant was 92%. Despite the efficiency of the plant being within the limits established by the EC Directive in terms of BOD5 decrease, an increase in the levels of Listeria species was still observed downstream from the plant. The species isolated with greatest frequency, both in the influent and effluent as well as the river water, was L. monocytogenes followed by L. seeligeri and L. welshimeri. L. ivanovii was only found in very low proportions in the river samples. The analysis of the sensitivity of Listeria species to 22 antimicrobial agents demonstrated the presence of a high percentage of bacteria resistant to aztrenam, cefuroxme, cetriaxone and to a leser degree moxalactam and cefotaxime. In contrast, resistance to aminoglycosides and tetracycline was only observed in a low number of isolates.

Sign in / Sign up

Export Citation Format

Share Document