Wyniki wyszukiwania - Biblioteka Nauki

1

Agricultural Use of Natural Biostimulants – Humic Substances: a review

100%

Kłeczek A.

Rocznik Ochrona Środowiska

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2022

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tom Tom 24

1--14

EN

This work presents the characteristics of humic substances, with particular emphasis on the properties of agricultural importance, i.e., the improvement of soil structure, soil properties and the availability of nutrients. Attention was also paid to the methods of introducing given substances into the soil and the possibility of direct application to the plant surface. The mechanisms responsible for the stimulating and protective effect of humic substances on plant development were explained in detail, including phytohormonal regulation, the mitigation of biotic and abiotic stresses, antioxidant properties and the influence on seed germination and the development of the plant root system. The economic and environmental importance of the application of the substances in question was also emphasized, consisting of maintaining the health of the soil and the quality of plants while reducing the share of chemical fertilizers and reducing the amount of water used. It should be noted that humic substances, like any agricultural product, should be appropriately selected for the type of cultivation, i.e., the optimal dose and method of application should be determined.

2

Removal of Humic Substances from Water by Means of Fibrous Ion Exchanger

100%

Wasąg H.

Journal of Ecological Engineering

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2020

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tom Vol. 21, nr 8

229--235

EN

Natural organic substances are found in all natural waters, and especially high concentrations occur in the surface waters. Humic substances, which often constitute the majority of natural pollutants, can be the source of undesirable odor and increased color as well as may accumulate certain toxic substances through sorption or formation of complexes. Another threat connected with the presence of humic substances in water is the possibility of the trihalomethanes (THM) formation during disinfection with chlorine. Additionally, it disturbs most processes employed for treatment of water. Hence, the great interest in the development of the pretreatment methods enabling to reduce the content of humic substances prior to the further water treatment processes. According to many researchers, ion exchange is an effective method for removing humic substances from drinking water supplies. However, the obtained effects are strictly dependent on the properties of the employed ion exchangers. The paper presented the studies on the removal of humic substances from water using fibrous ion exchangers. Owing to their structure, fibrous ion exchangers are characterized by very good kinetics of the sorption process, which enables the application of thin layers with simultaneous high flow velocity. Fiban A-1 – strong base anion fibrous exchanger, synthesized in the Institute of Physical Organic Chemistry of the National Academy of Sciences of the Republic of Belarus – was employed in the presented laboratory studies on the treatment of surface water containing substantial amounts of humic substances (over 10 g/m3). The applied anion exchange resin allows for efficient elimination of humic substances from the treated water, whereas the obtained sorption value, reaching approximately 20 mg/g of ion exchanger allowed treating about 255–270 bed volumes of water under the conditions of the experiment. The exhausted Fiban A-1 ion exchanger can be successfully regenerated using 2% NaCl + 2% NaOH solution, as five consecutive operational cycles showed no reasonable decrease in the amount of purified water.

3

The Performance of Electrocoagulation Process in Removing Organic and Nitrogenous Compounds from Landfill Leachate in a Three-Compartment Reactor

88%

Bagastyo A. Y. , Sidik F. , Anggrainy A. D. , Lin J.-L. , Nurhayati E.

Journal of Ecological Engineering

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2022

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tom Vol. 23, nr 2

235--245

EN

In this study, the effectiveness of the electrocoagulation (EC) process was evaluated based on the reduction of organic and nitrogenous contaminants in landfill leachate. A three-compartment electrochemical reactor as pre-treatment of stabilized landfill leachate was carried out ahead of biological treatment. The removal efficiencies of COD, BOD, ammonia, and nitrate were analyzed at pH 4, 6, and 8 with the current densities of 20.83 and 29.17 mA•cm–2. At pH 4, the highest removal of COD and NH4+ was obtained, i.e., in the range of 72–81% and 43–59%, respectively. The ratio of BOD5/COD was increased after EC, from initially 0.11 to 0.32 at pH 4. In addition, EC effectively removed humic substances in the leachate by targeting a large amount of high molecular weight humic substances, with around 103 kDa. However, the higher removal efficiency observed at higher current density leads to higher specific energy consumption. At a current density of 29.17 mA•cm–2, the specific energy consumption obtained in EC was around 10–17 Wh•g–1 COD and 99–148 Wh•g–1 NH4+. This could be decreased up to 50% at an applied current density of 20.83 mA•cm–2 with slightly lower efficiencies.

4

Impact of humic substances on the structure of the vegetation of hardwater lakes

88%

Bociag K.

Publications of the Department of Plant Taxonomy of the Adam Mickiewicz University in Poznan

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2000

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tom 10

5

Synthesis and properties of model humic substances derived from gallic acid

88%

Slawinska D. , Polewski K. , Rolewski P. , Slawinski J.

International Agrophysics

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2007

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tom 21

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nr 2

6

Humic substances in the Baltic sediments. I. Isolation and preliminary characterization of humic substances

75%

Bojanowski R. , Pempkowiak J. , Kupryszewski G.

Oceanologia

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1977

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tom 07

7

The origin of humic substances and their role in the aquatic environment

75%

Szpakowska B.

International Journal of Ecohydrology and Hydrobiology

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2003

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tom 03

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nr 2

165-172

8

The trends of lake trophy evolution due to allochthonous humic substances

75%

Wojciechowski I.

Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu

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1990

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tom 43

9

Długożyciowa opóźniona luminescencja materii organicznej -nowa metoda badania substancji humusowych

75%

Mielnik L. , Prokowski Z. , Mila A.

Gaz, Woda i Technika Sanitarna

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2009

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tom Nr 9

57-59

10

Supporting the process of removing humic substances on activated carbon

75%

Olesiak P. , Stepniak L.

Acta Biochimica Polonica

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2014

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tom 61

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nr 4

11

The content of anthocyanin in potato plants in an in vitro culture on the media with different humic products

75%

Klocek J. , Costa G. , Mioduszewska H.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2015

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tom 96

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nr 1

12

Chemical composition of compost from municipal waste in the context of use as fertiliser

75%

Becher M. , Symanowicz B. , Jaremko D. , Trzcinska E.

Acta Agrophysica

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2018

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tom 25

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nr 3

13

Outline of the history of studies on the effect of humic compounds on algae

75%

Guminski S.

Oceanologia

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1983

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tom 17

14

Impact of humic substances on Sphagnum denticulatum habitats

75%

Banas K.

Acta Societatis Botanicorum Poloniae

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2002

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tom 71

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nr 1

15

Comparison of concentrations of chemical components in surface waters from agricultural areas of Lithuania and Poland

75%

Zyczynska-Baloniak I. , Szpakowska B. , Grabauskiene I. , Baubinas R.

Polish Journal of Environmental Studies

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1993

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tom 02

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nr 2

EN

The aim of this paper is to compare the chemistry of surface waters taken from two areas: Poland (Wielkopolska) and Lithuania. These two areas have different environments and different agricultural utilization. The high concentration of both nutritive compounds and dissolved humic substances were found in the Wielkopolska Region, where a great proportion of cultivated fields and intensive agrotechnics are observed. Surface waters located in Lithuania, with a high percentage of wasteland such as bogs, pastures and meadows, showed much lower concentrations of the analysed components. The analysis of content of heavy metals in surface waters showed much greater concentrations of manganese, lead and zinc in Lithuanian water, which can be related to considerable atmospheric pollution of this area.

16

The role of biogeochemical barriers in water migration of humic substances

75%

Szpakowska B. , Zyczynska-Baloniak I.

Polish Journal of Environmental Studies

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1994

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tom 03

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nr 2

EN

This paper discusses research into the seasonal variability of concentrations of total carbon (TC), dissolved organic substances (DOC), and humic substances (HS) migrating with ground water from cultivated fields. Moreover, the effects of biogeochemical barriers such as meadow belts, shelterbelts and small field ponds on limiting migration of the chemical compounds in the agricultural landscape were analysed. It was found that ground water of the studied area contains high concentrations of all examined elements averaging from 44.7 to 73.1 mg/1 of TC, from 224 to 43.6 mg/1 of DOC, and from 6.84 to 20.3 mg/1 HS. It was shown that a 20 m wide meadow belt reduces concentration of TC in ground water by 29%, that of DOC by 44%, and HS by 52%. Moreover, it was found that surface waters of the studied area also contain high concentrations of TC (mean from 65.7 to 78.3 mg/1), DOC (47.8 mg/1), and HS (from 21.3 to 34.0 mg/1). The study results show that such biogeochemical barriers as meadow belts and small field ponds effectively limit the spread of organic compounds migrating with ground water through agricultural landscapes.

17

Changes in the vegetation of softwater lakes under the influence of humic substances

75%

Bociag K. , Szmeja J.

Polish Journal of Ecology

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2001

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tom 49

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nr 4

18

Biodiversity of phytoplankton in hydrochemically different types of humic lakes in the Drawienski National Park

75%

Joniak T. , Kraska M.

Acta Agrophysica

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2006

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tom 07

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nr 2[133]

19

The role of mid-field ponds in the storage of dissolved organic compounds [DOC] and heavy metals

75%

Zyczynska-Baloniak I. , Jaskulska R. , Szteke B.

Polish Journal of Environmental Studies

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1996

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tom 05

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nr 4

EN

This paper presents a study on the concentration of dissolved organic carbon (DOC) and humic substances (HS) in the waters of two different small ponds located in agricultural environments. DOC and HS content is high in the water of pond R adjacent to cultivated fields (DOC 42.0 mg/1, HS 34.2 mg/1) and in pond H surrounded by a wide belt of meadow and settled by macrophytes (DOC 48.0 mg/1, HS 37.2 mg/1). The total amounts of cations and cations bounded with humic substances dissolved in water of these two ponds have been analyzed. These studies indicate that small field ponds are a good biogeochemical barrier controlling organic compound migration with water from arable fields into water reservoirs.

20

Impact of humic substances on bacterioplankton in eutrophic lake

75%

Burkowska A. , Donderski W.

Polish Journal of Ecology

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2007

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tom 55

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nr 1

EN

This paper presents the results of resarch on impact of humic substances (HS) on bacterioplancton in eutrophic Lake Jeziorak (north-eastern Poland). In cultures of natural bacteria from the lake water, enriched with 0, 5, 10, 25 and 50 mg dm⁻³ of HS (natural HS – isolated from lake water or commercial HS – sodium salt of humic substance; Sigma-Aldrich), were determined the following parameters: total number of bacteria (TNB), number of heterotrophic bacteria (CFU), bacterial production (BP) (measured with [³H]methyl thymidine method) and general activity of esterases. Natural HS had a more positive impact on bacterial growth, bacterial production and activity of esterases than the commercial preparation HS. The highest TNB and CFU was observed when the water was enriched with 25 mg dm⁻³ of natural HS. All concentrations of the natural HS stimulated bacterial production. The activity of hydrolytic enzymes increased with rising concentrations of natural HS.