Quantum Backpropagation Neural Network Approach for Modeling of Phenol Adsorption from Aqueous Solution by Orange Peel Ash

Quantum Backpropagation Neural Network Approach for Modeling of Phenol Adsorption from Aqueous Solution by Orange Peel Ash

Siddhartha Bhattacharjee (Tata Consultancy Services, India), Siddhartha Bhattacharyya (RCC Institute of Information Technology, India) and Naba Kumar Mondal (The University of Burdwan, India)
Copyright: © 2014 |Pages: 22
DOI: 10.4018/978-1-4666-5125-8.ch057
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Abstract

The chapter describes a multilayer quantum backpropagation neural network (QBPNN) architecture to predict the removal of phenol from aqueous solution by orange peel ash, guided by the application of three types of activation functions and characterized by backpropagation of errors. These activation functions are Sigmoid function, tanh function and tan1.5h function. First by a classical multilayer neural network architecture with three types of activation functions is discussed in this chapter. It takes 6000000 iterations to train the network with a learning rate of 0.01. Among these three types of activation functions tan1.5 function shows the best prediction result. Next, QBPNN is discussed in this chapter. It takes 22000 iterations to train the network with the same learning rate. Here also tan1.5h function shows the best result in prediction of removal of phenol. Thus QBPNN is much faster than the classical multilayer neural network architecture. Different graphs are also given for comparison between the experimental output and network output using different activation functions. This particular chapter basically deals with a model application by which experimental results can be comparing with the model output. Because of their reliable, robust, and salient characteristics in capturing the non-linear relationships existing between variables (multi-input/output) in complex systems, it has become apparent that numerous applications of ANNs/QBNN have been successfully conducted in various parts of environmental engineering. Fuzzy Logic is also used as alternate method to predict the removal of phenol from aqueous solution by orange peel ash, but QBPNN shows the best result.
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Removal Of Phenol By Varying Different Operational Factors

The different parameters which affect the adsorption of phenol from an aqueous solution are:

  • 1.

    pH,

  • 2.

    Initial Concentration,

  • 3.

    Adsorbent Dosage,

  • 4.

    Stirring Rate (rpm),

  • 5.

    Contact Time and,

  • 6.

    Temperature.

The effect of the variation of these parameters on the adsorption characteristics of phenol are discussed in the following subsections.

Effect of pH

The initial pH of adsorption medium is one of the most important parameters affecting the adsorption process. The adsorption of phenol by orange peel ash (OPA) was studied at various pH values (3.0, 5.0, and 7.0). The percentage removal of phenol by OPA was highest at pH 5.0. Then the percentage of removal was decreased with increasing pH of the medium. The pH primarily affects the degree of ionization of phenol and the surface properties of OPA. The pH primarily affects the degree of ionization of phenol and the surface properties of water hyacinth ash (Benat et al. 2000).

Effect of Initial Concentration

Maximum removal was observed for an initial concentration of 20 ppm. Removal efficiency shows a decreasing trend with increasing concentration of phenol from 30 to 60 ppm. When the initial phenol concentration was increase from 10 mg/L to 60 mg/L on orange peel ash the loading capacity increased from 0.481 mg/g to 2.695 mg/g.

It is also evident that the sorption capacities of the sorbents increased with increasing phenol concentration while the adsorption yields of phenol showed the opposite trend (Caturla et al 1998 and Imagaw et al 2000).

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