Wyniki wyszukiwania - BazTech

1

Purification of Oil-Contaminated Wastewater with a Modified Natural Adsorbent

Chukaeva Mariia, Zaytseva Tatyana, Matveeva Vera, Sverchkov Ivan

Ecological Engineering & Environmental Technology

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2021

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Vol. 22, iss. 2

46--50

EN

Water purification from oil and oil products is the final stage of its preparation before injection into the oil reservoir. Natural sorbents are preferred over synthetic ones for use on drilling platforms. They have minimal negative impact on the environment as well as constitute renewable and biodegradable resources. Several adsorbents, based on various natural materials, which could be potentially used for wastewater treatment systems on drilling platforms, were selected. Comprehensive studies of natural sorbents were conducted to determine the possibility of their use as a filtration material for wastewater treatment from oil and oil products on the drilling platforms. As a result of laboratory studies, it was found that the most promising solution is the use of several types of nut shells, which showed the best ratio of abrasion resistance and adsorption characteristics. Among the studied shell samples, pecan shells showed the highest oil product adsorption. As a result of the temperature treatment of the sorbent, it was possible to increase the value of oil products adsorption twice and the value of adsorption activity by almost 13 times without reducing the strength characteristics. It was found that it is advisable to carry out carbonization at a temperature of 400°C.

2

Analiza stanu technicznego – konieczny element renowacji zabytkowych konstrukcji drewnianych więźb dachowych

Midek U.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2017

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z. 108

105--106

EN

The following work is like a statement in a nutshell, which can be used by a person who will want to perform an analysis of the technical condition of the construction of the antique roof frame. It contains all necessary information for this purpose. Based on the described analysis, you can create repair projects.

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Biological properties of nutshell and microcrystalline cellulose (MCC) filled high density polyethylene composites

Boran S., Dizman Tomak E., Dönmez Çavdar A.

Archives of Materials Science and Engineering

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2016

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Vol. 78, nr 2

71--77

EN

Purpose: The composites based on natural fibre and wood can be destroyed by fungi attack, even the lignocellulosic materials were used as filler in hydrophobic thermoplastic matrix. The aim of this study was to investigate the effect of microcrystalline cellulose (MCC) and nutshell fibre content on decay resistance of natural fibre composites. Design/methodology/approach: Half of the composite samples were immersed in water for 60 days and then incubated by fungi to investigate the leaching effect on biological resistance. Furthermore, water absorption rate and thickness swelling of samples were determined during water immersing. For this purpose, total nine thermoplastic composites filled different MCC rate (5%, 10% and 15%) and nutshell content (30%) were produced. Decay test were conducted by using a white rot fungus–Trametes versicolor, and a brown rot fungus–Tyromyces palustris, according to EN 113 standard. Findings: Based on findings from this study, weight loss, water absorption rate and thickness swelling correlated with lignocellulosic content in composites. Samples exhibited less than 1% weight loss in decay test and excellent biological resistance against testing fungi. Research limitations/implications: Weight loss (%) and moisture content (%) values of MCC-nutshell HDPE composites after Tyromyces palustris and Trametes versicolor attack were found under 3% and 20%, respectively. Low weight loss values obtained in the study are supposed to be related with the low moisture content. Originality/value: There is not a study dealing with the decay resistance of WPCs produced by a combination of nutshell and MCC fibres. In addition, there is not a substantial study on the effects of MCC/plastic ratio for decay performance of WPCs contained nutshell after long-term leaching test.

4

Impact of the temperature of waste biomass pyrolysis on the quality of the obtained biochar

Marczak M., Karczewski M., Makowska D., Burmistrz P.

Agricultural Engineering

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2016

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Vol. 20, No. 3

115--124

EN

Combustion and co-combustion of biomass from different sources is one of the most popular technologies applied in Poland. It allows management of numerous industrial, communal and agricultural waste. Organic waste constitutes one of the richest sources of cheap biomass solid fuels since they are very popular. The paper includes an assessment of practical use of biomass waste: hazelnut shell and pistachio nut shell. The impact of pyrolysis temperature (300, 450 and 550°C) of the investigated biomass on the quality of the obtained biochar was determined and the optimal temperature of this process was defined. The quality of the investigated biomass was analysed on account of its use for energy purposes. Numerous advantageous properties of the obtained materials were found out, for instance: low content of ash and a noticeable increase of the calorific value with an increase of the pyrolysis temperature.

PL

Spalanie i współspalanie biomasy różnego pochodzenia to jedno z najczęściej stosowanych technologii w Polsce, które pozwala na zagospodarowanie licznych odpadów przemysłowych, komunalnych i rolniczych. Odpady organiczne ze względu na powszechne występowanie stanowią jedno z najbogatszych źródeł tanich biomasowych paliw stałych. W pracy dokonano oceny praktycznego wykorzystania odpadów biomasowych: łupin orzecha laskowego oraz pistacji. Zbadano wpływ temperatury (300, 450 i 550ºC) pirolizy badanej biomasy na jakość uzyskanych karbonizatów oraz określono optymalną temperaturę tego procesu. Jakość badanej biomasy analizowano pod kątem wykorzystania jej do celów energetycznych. Stwierdzono szereg korzystnych właściwości otrzymywanych materiałów, takich jak: niska zawartość popiołu i zauważalne zwiększenie wartości opałowej wraz ze wzrostem temperatury pirolizy.