Changes to a rocky shore following upgrades from secondary to tertiary sewage treatment

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.

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Economies of Scale in Sewage Treatment Using a Translog Cost Function

The Korea Spatial Planning Review ◽

10.15793/kspr.2012.74..003 ◽

2012 ◽

Vol 74 (null) ◽

pp. 35-46

Author(s):

박선영 ◽

Chongwon Kim ◽

Seung-Hoon Yoo

Keyword(s):

Cost Function ◽

Economies Of Scale ◽

Sewage Treatment ◽

Translog Cost Function ◽

Translog Cost

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Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operation

Oceanological and Hydrobiological Studies ◽

10.2478/v10009-007-0049-7 ◽

2008 ◽

Vol 37 (2) ◽

Author(s):

Maciej Walczak

Keyword(s):

Water Quality ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Sewage Treatment Plants ◽

Plant Operation ◽

Treated Sewage ◽

Microbiological Parameters ◽

Microbial Indices

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operationThis paper reports the results of studies of microbiological changes in the water quality of the Vistula and Brda rivers after the opening of sewage treatment plants in Bydgoszcz. The study involved determining the microbiological parameters of water quality. Based on the results obtained, it was found that the quality of the water in both rivers had improved decidedly after the opening of the plants, although an increased number of individual groups of microorganisms was found at the treated sewage outlet from one of the plants.

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Niche Sharing in Intertidal Mollusks and Decapods in Rocky Shore of Easter Island

Vestnik Zoologii ◽

10.2478/vzoo-2019-0037 ◽

2019 ◽

Vol 53 (5) ◽

pp. 417-422

Author(s):

P. De los Ríos ◽

E. Ibáñez Arancibia

Keyword(s):

Spatial Distribution ◽

Negative Binomial Distribution ◽

Binomial Distribution ◽

Rocky Shore ◽

Negative Binomial ◽

Null Model ◽

Easter Island ◽

Published Data ◽

Distribution Analysis ◽

Field Works

Abstract The coastal marine ecosystems in Easter Island have been poorly studied, and the main studies were isolated species records based on scientific expeditions. The aim of the present study is to apply a spatial distribution analysis and niche sharing null model in published data on intertidal marine gastropods and decapods in rocky shore in Easter Island based in field works in 2010, and published information from CIMAR cruiser in 2004. The field data revealed the presence of decapods Planes minutus (Linnaeus, 1758) and Leptograpsus variegatus (Fabricius, 1793), whereas it was observed the gastropods Nodilittorina pyramidalis pascua Rosewater, 1970 and Nerita morio (G. B. Sowerby I., 1833). The available information revealed the presence of more species in data collected in 2004 in comparison to data collected in 2010, with one species markedly dominant in comparison to the other species. The spatial distribution of species reported in field works revealed that P. minutus and N. morio have aggregated pattern and negative binomial distribution, L. variegatus had uniform pattern with binomial distribution, and finally N. pyramidalis pascua, in spite of aggregated distribution pattern, had not negative binomial distribution. Finally, the results of null model revealed that the species reported did not share ecological niche due to competition absence. The results would agree with other similar information about littoral and sub-littoral fauna for Easter Island.

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