Wyniki wyszukiwania - Biblioteka Nauki

1

Resource reuse of waste-activated sludge as raw material of microbial flocculant preparation: methods and comparison

100%

Zhang Z. , Zhang J. , Xia S.

Polish Journal of Environmental Studies

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2013

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tom 22

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nr 3

EN

Resource reuse of waste-activated sludge (WAS) from a municipal wastewater treatment plant (WWTP) was introduced as raw material of microbial flocculant (MBF) preparation. With WAS samples of three concentrations, MBF preparation by various methods – including cation exchange resin (CER), CER-ultrasonication, CER-ultrasonication-CER, ultrasonication, ultrasonication-CER, and ultrasonication-CER-ultrasonication methods – were comparatively investigated. According to the results of chemical compositions, concentrations, and flocculating activities of the prepared MBFs, the compound methods excelled the sole methods, and the CER-ultrasonication method was the best. Major compositions of the prepared MBFs contained polysaccharides, proteins, and nucleic acids. Improving sludge concentration was beneficial to extract MBF in high concentrations using the above methods. Appropriate MBF mass dosage was crucial its flocculating activity because less or more dosage would deteriorate the flocculation. The mechanism analysis indicated that CER treatment could provide a good pretreatment for ultrasonication, but became useless when it was set after ultrasonication.

2

A new palmprint segmentation method based on an inscribed circle

100%

Li W. , Xia S. , Zhang D. , Xu Z.

Image Processing & Communications

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2003

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tom Vol. 9, no 1-2

63-70

EN

Palmprint segmentation, which involves extracting a suitable part of a palmprint for feature extraction and matching, provides the basis for palmprint identification. In this paper, we propose using an inscribed circie for palmprint segmentation. The proposed method is able to obtain the contour of a palmprint and calculate the biggest inscribed circle for the contour. The part of the palmprint that falls within the circie is extracted for further processing. In comparison to the earlier proposal of a segmentation method that uses a square, the new method can deal with more distortions in the original images, provides a higher accuracy and includes more meaningful features. Experimental results demonstrate the effectiveness of using the inscribed circle for segmentation.

3

Embedding microbial fuel cells into the vertical flow constructed wetland enhanced denitrogenation and water purification

75%

Liu Q. , Zhou B. , Zhang S. , Xu D. , Pan R. , Xia S.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 3

EN

Constructed wetlands have been extensively applied for treating drinking water sources and other water bodies that are not severely polluted due to their low construction and operation costs. In this regard, microbial fuel cells (MFC) could potentially achieve both energy generation and wastewater purification, though the construction cost is high. Based on the bio-electrochemical theory, a novel device of the integrated vertical flow constructed wetland (IVCW) embedded with MFC (IVCW-MFC) was designed and built for treating the slightly-polluted source waters with relatively high nitrogen and low carbon, where denitrification was usually hindered. Both water purification performance and electrical characteristics were examined in this system. It was observed that the maximum output voltage and power density could reach 777 mV and 8.05 mW·m⁻², respectively, when the external resistance was 6000 Ω. With a better denitrification effect, the system exhibited a more effective removal of chemical oxygen demand (COD) and nitrate. The maximum efficiency of total nitrogen (TN) removal was as high as 97.35%, while the average removal efficiency was around 70%, even with a load of TN, 3.3 mg/L on average, in the influent. Furthermore, the macrophytes grew normally in the constructed wetland without any influence.

4

Determination of the impurities in high purity rubidium chloride

75%

Jiang Y. , Gao S. , Hu M. , Fang Q. , Xia S. , Chai M.

Chemia Analityczna

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2003

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tom Vol. 48, No. 1

37-44

EN

Alkali metal elements often occur together, and their separation and simultaneous determination is not an easy task. In this paper, a very simple, sensitive and reliable method is presented for the determination of the trace impurities of alkali metal ions (lithium, sodium, potassium and cesium) in high purity rubidium chloride by flame atomic absorption spec-trometry (FAAS). The detection limit which was expressed in characteristic concentration (ug mL(-1) /1 % absorption) for Li+, Na+, K+, Cs+ was 0.032, 0.011, 0.034 and 0.183 respectively, and the recovery in the spiked samples was in the range : 91.6% ~ 107.8%. The analytical system can be used conveniently to monitor the product quality of RbCl in the process of its preparation and purification. In addition, the procedure could be adopted for the analysis of other similar samples.

PL

Metale alkaliczne często występują razem a ich rozdzielanie i jednoczesne oznaczanie jest niełatwym zadaniem. W niniejszej pracy przedstawiono prostą, czulą i wiarygodną metodę oznaczania śladowych ilości metali alkalicznych w chlorku rubidu wysokiej czystości za pomocą płomieniowej absorpcyjnej spektrometrii atomowej (FAAS). Granice detekcji wyrażone jako charakterystyczne stężenie (fig mL(-1)/1 % absorpcji) dla Li+, Na+, K+, Cs+ wynosiły odpowiednio: 0.032,0.011,0.034 i 0.183, a odzysk w próbkach ze znanym dodatkiem metali alkalicznych był w granicach 91.6-107.8%. Ten układ analityczny dobrze nadaje się do monitorowania jakości RbCl w procesie jego otrzymywania i oczyszczania. Poza tym ten sposób postępowania może być zaadaptowana do analizy innych, podobnych produktów.

5

Effects of combined nitrogenous based inorganic fertilizers and two forms of organic fertilizers on plant phenotypic characteristics and soil bacterial community structure within a cotton field environment

75%

Wang X. , Zhang J. , Xia S. , Qin H. , Feng C. , Zhang Y. , Bie S.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 6

6

Biochemical characterization of a catalase from Vibrio vulnificus, a pathogen that causes gastroenteritis

63%

Pei J. , Wang H. , Wu L. , Xia S. , Xu C. , Zheng B. , Li T. , Jiang Y.

Acta Biochimica Polonica

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2017

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tom 64

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nr 3