Wyniki wyszukiwania - BazTech

1

Unusual echinoid resting trace records change in the position of the redox boundary (Palaeogene of the Lesser Caucasus in Georgia)

Uchman Alfred, Lebanidze Zurab, Kobakhidze Nino, Beridze Tamar, Makadze Davit, Lobzhanidze Koba, Khutsishvili Sophio, Chagelishvili Rusudan, Koiava Kakha, Khundadze Nino

Acta Geologica Polonica

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2022

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Vol. 72, no. 3

317--330

EN

The first recognition of a tracemaker responding to a temporary shift in the redox boundary is recognized. This is recorded by a new trace fossil, Sursumichnus orbicularis igen. et isp. nov., which is established for mound-like structures on the upper surfaces of sandstone beds from the Borjomi Flysch (upper Paleocene–lower Eocene) in the Lesser Caucasus (Georgia). It is connected with the spatangoid echinoid burrow Scolicia de Quatrefages, 1849 and interpreted as a resting trace of the same tracemaker produced after moving up from a deeper position within the sediment. The resting is caused by an episode of unfavourable conditions related to shallowing of the redox boundary. The trace fossil is a component of the Nereites ichnofacies.

2

Dissolved oxygen variability in the southern Baltic Sea in 2013-2018

Rak Daniel, Walczowski Waldemar, Dzierzbicka-Głowacka Lidia, Shchuka Sergey

Oceanologia

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2020

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No. 62 (4PA)

525--537

EN

This paper discusses changes in the dissolved oxygen concentration (DOC) in the southern Baltic Sea. The oxygenation of the whole water column was estimated. Monthly mean DOCs, as well as a detailed description of the annual surface layer dissolved oxygen (DO) cycle, are presented. The DO cycle at the surface is characterized by two maxima in March/April and November, and by two minima in July/August and December. The DO decline time after the major Baltic inflow (MBI) in 2014 was estimated at about 10 months for the Bornholm Deep and Słupsk Furrow. Whereas the Bornholm Basin was relatively well oxygenated, low oxygen concentrations (<4 mg l−1) were measured in the deep layer of the Gdańsk Deep throughout the inflow period. In addition, the cod spermatozoa activation layer together with the neutral egg buoyancy layer for the Bornholm Basin and Słupsk Furrow are discussed on the basis of the measured DOCs and the variability in hydrographic conditions.

3

Role of macrophytes in structuring littoral habitats in the Vistula Lagoon (southern Baltic Sea)

Pawlikowski Krzysztof, Kornijów Ryszard

Oceanologia

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2019

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No. 61 (1)

26--37

EN

The objective of the research conducted in the years 2011-2014 in the near-shore zone of the Vistula Lagoon was the verification of the hypothesis that in the coastal lagoon, similarly as in inland waters, habitat conditions can be substantially modified by macrophytic vegetation, depending on the represented life form and its abundance. The research was conducted in the zone of emergent plants (reed rush composed of Phragmites australis) and in the zone of submerged plants occurring as scattered patches of Potamogeton perfoliatus and Stuckenia pectinata. The hypothesis was supported only in the case of the reed rush chich substantially modified water insolation, temperature, and oxygenation, as well as the grain size composition of sediments, and concentration of organic matter contained in the sediments. Patches of submerged vegetation had insufficient surface area and were too scarcely overgrown by plants to considerably affect the habitat conditions and weaken the strong mechanical effect of waves and rate of water exchange between the littoral and open water zone.

4

Usuwanie biomasy z oczek wodnych i małych zbiorników naturalnych przy użyciu filtrów włókninowych

Nieć J., Spychała A., Ławniczak A. E., Walczak N.

Inżynieria Ekologiczna

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2015

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Nr 44

196--203

PL

Małe zbiorniki, np. oczka wodne, pełnią w środowisku wiele funkcji, między innymi biocenotycznych, hydrologicznych, klimatycznych, sozologicznych, krajobrazowych oraz estetycznych. Ze względu na małe rozmiary, zbiorniki te charakteryzują się dużą wrażliwością na czynniki zewnętrzne i wewnętrzne, stanowią też często naturalny odbiornik zanieczyszczeń. Filtry włókninowe są od kilkunastu lat badane pod kątem oczyszczania ścieków bytowych podczyszczonych w osadniku gnilnym. Celem badań było zweryfikowanie możliwości zasto-sowania tego typu filtrów do oczyszczania wody w naturalnych, małych zbiornikach. Skuteczność działania filtrów testowano na wodzie pochodzącej z oczka wodnego, charakteryzującej się wysokim stężeniem biogenów i intensywnym zakwitem fitoplanktonu. Badania prowadzono na trzech filtrach (cztery warstwy geowłókniny TS 20). Mierzono podstawowe wskaźniki jakości wody: zawiesinę ogólną, mętność, ChZT i BZT5, temperaturę, pH i tlen rozpuszczony. Uzyskane wyniki badań można uznać za satysfakcjonujące w zakresie oczyszczania mechanicznego (usuwanie mętności i zawiesiny ogólnej). Ważnym pozytywnym efektem działania filtrów jest natlenianie oczyszczanej wody, co ma szczególne znaczenie dla ryb.

EN

Small water bodies, for example garden ponds, play many functions in the environment, including biocenotic, hydrological, climatic, sozological, landfill-creative, and aesthetic. Due to their small size, these reservoirs are sensitive to external and internal factors, they are also a common natural contaminants receivers. Nonwoven filters have been investigated for several years as a useful device for treatment of domestic wastewater pre-treated in a septic tank. The aim of this study was to verify the possibility of using this type of filters for water originating from small water body purification. The effectiveness of filters were tested on the water originating from the garden pond, contained high levels of nutrients and intensive algal bloom. Research was carried out on three filters (each filter consisted of four geotextile TS 20 layers). Basic water quality indicators: total suspended solids, turbidity, COD and BOD5, temperature, pH and dissolved oxygen were measured. The research results can be considered as satisfactory in terms of mechanical treatment (removal of turbidity and total suspended solids). An important positive effect of the filters was the oxygenation of the treated water, which is especially important for fish.

5

Badania współczynnika wnikania masy w procesie mieszania z napowietrzaniem wody

Ochowiak M., Broniarz-Press L., Kaczmarek A., Kujawa N.

Postępy Techniki Przetwórstwa Spożywczego

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2013

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nr 1

88--91

PL

W artykule przedstawiono wyniki badań doświadczalnych współczynnika wnikania masy w procesie mieszania cieczy mieszadłem turbinowym Rushtona oraz mieszadłem śmigłowym z jednoczesnym napowietrzaniem. Wykazano, że mieszadło śmigłowe nadaje się bardziej do rozprowadzania tlenu przy niższych wartościach częstości obrotowych mieszadła. Turbina Rushtona lepiej rozprowadzała tlen przy większych wartościach częstości obrotów.

EN

The paper presents results of experimental studies on the volumetric mass transfer coefficient for two types of impellers (Rushton turbine and propeller stirrer) in the mixing process with the aeration. It has been shown that propeller stirrer is more suitable for a distribution of oxygen at lower rotation speeds. It appeared that the Rushton turbine distributes oxygen better at the higher rotation of speeds.

6

Faunal dynamics of foraminiferal assemblages in the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland

Smoleń J.

Acta Geologica Polonica

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2012

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Vol. 62, no. 3

403-419

EN

The faunal dynamics of benthic foraminifera in the Middle Jurassic ore-bearing clays of Gnaszyn (Kraków-Częstochowa Upland, south-central Poland) are used to reconstruct sedimentary environments. Two types of foraminiferal assemblages, distinct in their quantitative and qualitative composition, were distinguished; type I assemblages, characterizing intervals between horizons with sideritic concretions; and type II assemblages, characterising horizons with sideritic concretions. Benthic foraminifers were further subdivided into eight ecological morphogroups, based on their morphological features and micro-habitats. Type I assemblages consist mostly of plano/concavo-convex, small-sized epifaunal morphotypes, with a restricted occurrence of shallow infaunal forms and a scarcity of deep infaunal taxa, which suggests low-oxygen conditions in both sediment and bottom waters, and a high sedimentation rate in an outer shelf environment. Type II assemblages are characterized by high taxonomic diversity, high specimen abundance and variability of epifaunal and infaunal morphotypes representing a mixed group of specialized feeding strategies. This suggests optimum living conditions controlled by a lower sedimentation rate, relatively well-oxygenated bottom waters and sufficient or high food supply.

7

Wpływ zabudowy hydrotechnicznej rzeki na zawartość i nasycenie wody tlenem rozpuszczonym

Bogdał A.

Gaz, Woda i Technika Sanitarna

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2011

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Nr 10

349-351

8

Monitoring natleniania przy cyklicznym napowietrzaniu w reaktorach o małej skali typu mbbr

Borowski J.

Inżynieria Ekologiczna

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2006

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Nr 14

49-62

PL

Przedmiotem opracowania są formy procesów natleniania zachodzące w okresowo napowietrzanej przepływowej komorze reakcji wypełnionej ściekami z osadnika gnilnego, osadem czynnym i złożem ruchomym. Celem artykułu jest zaprezentowanie części wyników własnych badań z pomiarów natlenienia w skali laboratoryjnej i podanie pewnej konkretnej formy równania bilansu masy tlenu w warunkach okresowego napowietrzania zawartości komory reakcji reaktora typu MBBR.

EN

In this paper the forms of oxygenation processes are discussed which occur inside flow reaction chamber filled up with effluent from septic tank, active sludge and a moving bed subject to periodical aeration. The paper aims at: presenting some results obtained from the author's own investigation on aeration in a laboratory scale and an attempt to define a certain concrete form of oxygen mass balance equation under conditions of intermittent aeration inside the reaction chamber of MBBR type and in the presence of a moving bed.

9

Natlenianie zanieczyszczonych osadów dennych podczas tymczasowego składowania

Malina G., Vermeulen J., Kromer M.

Inżynieria i Ochrona Środowiska

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2004

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T. 7, nr 3/4

401-419

PL

Dla badanych osadów określono indeks dojrzewania, stopień kurczenia, współczynnik dyfuzji oraz dystrybucję tlenu. W celu odwodnienia osadów i uzyskania różnych etapów fizycznego dojrzewania osadów zastosowano potencjały matrycowe w zakresie od -100 do -1 000 000 hPa. Sprawdzono wpływ zastosowanego potencjału matrycy na występowanie miejsc pozbawionych tlenu w agregatach osadowych. Przeprowadzone badania pozwoliły na wypracowanie efektywnej metody pomiaru centrów tlenowych w osadach dennych. Dostarczyły one danych o wpływie kurczenia się agregatów na wzrost współczynnika dyfuzji tlenu, a w konsekwencji na wzrost natlenienia, co ma istotne znaczenie dla bioremediacji osadów zanieczyszczonych substancjami organicznymi (np. substancje ropopochodne, WWA) podczas ich tymczasowego składowania.

EN

Temporary disposal is the most widely adopted alternative for sediments dredged annually in some countries (e.g. the Netherlands) for both maintenance and environmental reasons. For good management of disposal sites, knowledge is required about controlling the behaviour of sediments during disposal. A short overview was made about processes that take place during temporary disposal, and how they can affect the biodegradation of organic contaminants. The method of oxygenation measurements within sediments aggregates was developed and improved in order to evaluate the bioremediation potentials during temporary disposal of sediments contaminated with organic compounds. The parameters determined for three studied sediments (I, II and III) included: the ripening index, shrinkage, diffusion coefficient and oxygen distribution in sediment aggregates. To enhance dewatering and to simulate diverse stages of sediment ripening, matrix potentials from -100 to -1,000,000 hPa were applied. The effect of diverse matrix potentials on the formation of oxic and anoxic zones within the aggregates was also determined. The complete transformation of sediments into soil was taking place at matrix potentials between -1000 and -2000 hPa when the ripening indexes for all sediments dropped below 0.7. For lower ripening indexes an increase of pore volumes filled with air was observed. The highest ripening index of 0.5 was for sediment III, in which the highest organic matter content was found. Decreasing matrix potentials resulted in an increase of the O2 penetration depths in sediment aggregates. At the matrix potential of -16,000 and lower, the whole aggregates were fully aerated. Increased organic matter contents limited the depth of O2 penetration. The diffusion coefficients were higher proportionally to the decreased matrix potentials. Shrinkage of aggregates affected the diffusion coefficients and oxygenation, which is an important factor to be considered for bioremediation of sediments contaminated with organic substances (oil hydrocarbons, PAHs) during temporary disposal. Thus, the physical ripening of dredged sediments is a promising technique to enhance aerobic bioremediation of polluted sediments.

10

Impedance methods for tissue characterization

Pałko T.

Biocybernetics and Biomedical Engineering

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2002

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Vol. 22, no. 4

69-77

EN

The spectral characteristics of electroimpedance of chosen tissues were studied. The results of the experimental and medical study show that the complex impedance as a function of frequency differs for normal and abnormal tissue with chronic circulation disturbances (ischemia). The presented methods are useful and easy for experimental and medical application.