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The Influence of Selected Factors on the Removal of Anionic Contaminants from Water by Means of Ion Exchange MIEX®DOC Process

The Influence of Selected Factors on the Removal of Anionic Contaminants from Water by Means of Ion Exchange MIEX®DOC Process

The study of the effectiveness of the removal of anionic natural organic matter (fulvic acids-FA and humic acids-HA) and inorganic anions (F-, Br-, NO3 -) in MIEX®DOC process was performed. The influence of physico-chemical parameters of feed water on the process performance was investigated. The ion exchange process was carried out using strongly basic, macroporous polystyrene resin MIEX® by Orica Watercare. The synthetic feed waters differ in composition, i.e. concentration of FA and HA (ca. 6 and 12 mg/L), anions content (F-, Br-, NO3 -) and of various alkalinity (ca. 20 and 120 mg/L as CaCO3) were used. The study confirmed the possibility of application of MIEX®DOC process for removal of anionic contaminants from water. It also showed the significant impact of feed water parameters on the process effectiveness. Moreover, the strong dependence of anions (F-, Br-, NO3 -) removal, FA and HA concentration on the resin dose was revealed.

Open access
Comparison of PCR-DGGE and Nested-PCR-DGGE Approach for Ammonia Oxidizers Monitoring in Membrane Bioreactors’ Activated Sludge

Abstract

Nitritation, the first stage of ammonia removal process is known to be limiting for total process performance. Ammonia oxidizing bacteria (AOB) which perform this process are obligatory activated sludge habitants, a mixture consisting of Bacteria, Protozoa and Metazoa used for biological wastewater treatment. Due to this fact they are an interesting bacterial group, from both the technological and ecological point of view. AOB changeability and biodiversity analyses both in wastewater treatment plants and lab-scale reactors are performed on the basis of 16S rRNA gene sequences using PCR-DGGE (Polymerase Chain Reaction – Denaturing Gradient Gel Electrophoresis) as a molecular biology tool. AOB researches are usually led with nested PCR. Because the application of nested PCR is laborious and time consuming, we have attempted to check the possibility of using only first PCR round to obtain DGGE fingerprinting of microbial communities. In this work we are comparing the nested and non-nested PCR-DGGE monitoring of an AOB community and presenting advantages and disadvantages of both methods used. The experiment revealed that PCR technique is a very sensitive tool for the amplification of even a minute amount of DNA sample. But in the case of nested-PCR, the sensitivity is higher and the template amount could be even smaller. The nested PCR-DGGE seems to be a better tool for AOB community monitoring and complexity research in activated sludge, despite shorter fragments of DNA amplification which seems to be a disadvantage in the case of bacteria identification. It is recommended that the sort of analysis approach should be chosen according to the aim of the study: nested-PCR-DGGE for community complexity analysis, while PCR-DGGE for identification of the dominant bacteria.

Open access
Dimensioning of Digestion Chamber for Upgrading of Gas Recovery at Wastewater Treatment Plant

Abstract

The paper describes practical results of four-year laboratory studies completed to estimate technically feasible conditions of upgrading an existing sludge disposal system. A minimization of sludge mass and volume together with an energy recovery improvement were main goals of these activities. The way from lab studies and simulations to full scale investments has been shown with a special emphasis on application of respirometric procedure being applied by authors. Proposed was authors’ procedure for an estimation of a digestion time prediction for sludge of specific composition. Investigations completed at existing wastewater treatment plant resulted in practical implementation to be used during the design of upgrading and extension of the digestion and energy recovery system at the plant. It was proved that proposed changes provide close to optimum conditions for process performance and the application of proposed calculation procedures was adopted by design team

Open access
Efficiency of aerobic biodegradation of beet molasses vinasse under non-controlled pH: conditions for betaine removal / Efektywność tlenowej biodegradacji buraczanego wywaru melasowego przy nieregulowanym pH podłoża: określenie warunków usunięcia betainy

/AWWA/CWEA Joint Residuals and Biosolids Management Conference, Biosolids 2001: Building Public Support. Water Environment Federation). [42] Suvilampi, J. & Rintala, J. (2003). Thermophilic aerobic wastewater treatment, process performance, biomass characteristics, and effluent quality, Reviews, Environmental Science and Biotechnology, 2, 1, pp. 35-51. [43] Thalasso, F., van der Burgt, J., O’Flaherty, V. & Colleran, E. (1999). Large-scale anaerobic degradation of betaine, Journal of Chemical Technology and Biotechnology, 74, 12, pp. 1176

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Processing of sodium sulphate solutions using the EED method: from a batch toward a continuous process

Abstract

In a batch electro-electrodialysis (EED), sodium sulphate solution with an initial concentration of 80.90 g/dm3 was converted to obtain solutions of sodium hydroxide (13.96%) and sulphuric acid (10.15%) and a dialysate (3.23 g/dm3 of sulphate ions). Changes in the EED process′ performance (temperature, cell voltage, concentrations, energy consumption) with an increasing conversion degree of salt are presented. Based on the presented results of the batch experiment, conditions necessary to run the process continuously are discussed. A single pass method is inapplicable due to excessive heating of the electro-electrodialyser. A cascade method enables interstage cooling of the solutions, providing temperatures suitable for ion-exchange membranes to work. Increasing the number of stages in the cascade reduces both the number of electro-electrodialysers and specific electric energy consumption, providing the same production capacity. However, this increases the investment cost.

Open access
The role of strategic agility in the IT sector

., Chatha, K. A., & Farooq, S. (2018). Impact of supply chain risk on agility performance: Mediating role of supply chain integration. International Journal of Production Economics, 205, 118-138. Mayeh, M., Ramayah, T., & Mishra, A. (2016). The role of absorptive capacity, communication and trust in ERP adoption. Journal of Systems and Software, 119, 58-69. Păunescu, C., Popescu, M., & Duennweber, M. (2018). Factors Determining Desirability of Entrepreneurship in Romania. Sustainability, 10(11), 3893. Paunescu, C., 2009. Managing process performance and

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Achieving strategic agility through business model innovation. The case of telecom industry

, C. (2009). Managing process performance and quality for sustainability in the service organizations. The Amfiteatru Economic Journal, 11(26), 323-329. Paunescu, C. (2014). Current trends in social innovation research: social capital, corporate social responsibility, impact measurement. Management & Marketing, 9(2), 105. Păunescu, C., & Badea, M. R. (2014). Examining the social capital content and structure in the pre-start-up planning. Procedia Economics and Finance, 15, 560-568. Queiroz, M., Tallon, P.P., Sharma, R

Open access