ELEKTROKOAGÜLASYON YÖNTEMİYLE KAĞIT ATIK SUYU ARITIMINDA pH KONTROLU

Yapılan çalışmada kağıt endüstrisi atık sularının elektrokoagülasyon ile arıtıldığı bir proseste çıkış değişkeni pH’ın oransal integral türevsel kontrolu gerçekleştirilmiştir. Ayarlanabilen değişkenler olarak 0.1 M HCl ve 0.1 M NaOH akış hızları seçilmiştir. Çalışmanın ilk basamağında dinamik analiz ve sistem tanımlama çalışmaları gerçekleştirilmiştir. Asit ve baz akış hızlarına verilen basamak etkiler ile dinamik koşuldaki pH verileri toplanmış ve yinelemeli en küçük kareler yöntemi kullanılarak asit ve baz akış hızlarının ayrı ayrı prosesin pH değerini değiştirdiği durumların auto regressive moving average with external input (ARMAX) modelleri elde edilmiştir. Elde edilen modeller MATLAB’da kodlanan teorik oransal integral türevsel kontrol edici programında kullanılarak deneme-yanılma yöntemi ile en uygun oransal integral türevsel kontrol edici parametreleri bulunmuştur. Bu parametreler deneysel çalışmaları gerçekleştirmek amacıyla MATLAB/Simulink’te tasarlanmış gerçek zamanlı oransal integral türevsel kontrol edicide kullanılmıştır. Asit ve baz ayar değişkenlerinin prosese birlikte uygulanarak koordineli kontrol çalışmalarının gerçekleştirildiği proseste pH 5 ile 11 arasında değiştirilmiş olup en yüksek bulanıklık ve renk giderim verimleri pH 5 değerinde sırasıyla % 98.6 ve % 99.4 bulunmuştur

Impact of Robust Error Control on Fluid Level by Wireless Network Applications

WOS: 000444156000022The paper presents a process simulator developed with wireless process control purpose and antennas and modules for wireless communication applications. The impact of robust error control code onwireless liquid level control experiments is investigated by means of three tuning coefficients of the proportional integral derivative actionswhich are initially determined by using nonparametric methods. The initial controller tuning coefficients were determined using the process reaction curve which sketched the data obtained in response to a step change by wireless communication. The well-tuned control parameters were assessed by means of a MATLAB graphical tool (SISO). To determine the bias values of the process simulator, an initial steady state was obtained and the system output was monitored at the constant control valve openness (10%) for 100s. At the end of 100 seconds, the control key in MATLAB/ Simulink block diagram was changed and the control algorithm was activated and different set point changes were given to the system at the same time and the effect of the parameters was observed. It was seen that the liquid level tended to level off around the desired set values in the wireless control experiments performed to follow different set points by using the wireless robust error control with well-tuned parameters. The proposed wireless control and communication networkperformances were compared with the integral of squared error (ISE) and the integral of absolute error (IAE) criteria at various fluid levels

Distributed Wireless Liquid Level Control of a Process Simulator Over a Network

WOS: 000450578800003In a process simulator, the distributed wireless liquid level control experiments have been performed by using the generalized predictive control algorithm. The wireless local area network was established with antennas between process simulator in Unit Operations Laboratory and the computer in Process Control Laboratory. We performed the online wireless experiments with MATLAB/Simulink program. Data transfer during the wireless experiments were carried out using radio waves at a frequency of 2.4 GHz. Experiments on the same conditions were achieved by three certain values of control weighting factor in the controller algorithm, whilst the changes in valve opening and liquid level with time were monitored. In all experiments performed with the distributed control system, the control valve opening is fixed with very small oscillations after a sudden increase in the beginning. We obtained the best liquid level control response to different set point changes for the same set of controller tuning values. The Integrated Square of the Error and the Integrated Absolute of the Error values were chosen as performance criteria. The distributed wireless liquid level control was effectively realized to the process simulator and it is recommended for industrial applications

Enclosed coastal waters quality monitoring with bacterial indicator phase-plane analysis

With phase-plane analysis in Matlab, the relations between the bacterial indicators and dissolved oxygen (DO), pH and temperature, was examined by considering the dynamic during 20 September 2013 to 8 February 2014 for water quality monitoring in enclosed coastal waters at the edge of the Kas region of Turkey. It has been suggested that the bacterial indicator phase plane analysis provides a good method of monitoring. It was shown that temperature (significance value, p=4.9e-05), DO (p=1.0e-04) and pH (p=4.6e-04) values have a significant effect on bacterial indicators. The relationship between the bacterial indicators was examined by comparing the same scale ``cusp{''} diagrams, and it was demonstrated that total coliforms concentration were closely related with faecal coliforms (FC) concentration. In presenting the enclosed coastal water quality information, weighting average water quality index (WQIMP) has been used by selecting the sets of appropriate parameters. To keep track of and analyse changes over time by calculating the index numbers, the set of seven variables which are FC, DO, pH, temperature, turbidity, nitrate, total suspended solids and the set of three variables which are FC, temperature, DO were utilized successfully (p=8.3e-05). Parameter quality values were obtained from the software developed using cubic hermite polynomial in Matlab